Helge Weman

About

My research area: Nanophotonic Materials and Devices

In 2005 I was appointed as a full professor of nanophotonics as part of NTNU's strategic initiative in nanotechnology. At the Department of Electronic Systems my research focuses on synthesis and characterization of semiconductor nanowires for use in energy efficient light emitters and solar cells. Since 2015 a strong focus is being made on AlGaN nanowire ultraviolet (UV) LEDs grown on graphene.

In 2010 I discovered and patented the growth of semiconductor nanowires on graphene originally shown for GaAs nanowires. This concept is schematically shown in this YouTube video https://www.youtube.com/watch?v=3wLOXHRVVwQ

I am the inventor or co-inventor of 15 patent families with over 100 granted patents worldwide.

I am the founder and Chief Scientific Officer (CSO) of CrayoNano AS http://crayonano.com (founded in 2012) who are now developing germicidal UV LEDs using semiconductor nanowires on graphene substrates for use in water, air and surface disinfection applications.

I am an elected member of the Norwegian Academy of Technical Sciences (NTVA) since 2010.

Publications

2021

Liudi Mulyo, Andreas; Mukherjee, Anjan; Høiaas, Ida Marie; Ahtapodov, Lyubomir; Nilsen, Tron Arne; Toftevaag, Håvard Hem; Vullum, Per Erik; Kishino, Katsumi; Weman, Helge; Fimland, Bjørn-Ove. (2021) Graphene-Based Transparent Conducting Substrates for GaN/AlGaN Nanocolumn Flip-Chip Ultraviolet Light-Emitting Diodes. ACS Applied Nano Materials. volum 4 (9).
Academic article
Mukherjee, Anjan; Ren, Dingding; Vullum, Per Erik; Huh, Junghwan; Fimland, Bjørn-Ove; Weman, Helge. (2021) GaAs/AlGaAs Nanowire Array Solar Cell Grown on Si with Ultrahigh Power-per-Weight Ratio. ACS Photonics. volum 8 (8).
Academic article

2020

Liudi Mulyo, Andreas; Rajpalke, Mohana; Vullum, Per Erik; Weman, Helge; Kishino, Katsumi; Fimland, Bjørn-Ove. (2020) The influence of AlN buffer layer on the growth of self-assembled GaN nanocolumns on graphene. Scientific Reports. volum 10 (853).
Academic article

2019

Høiaas, Ida Marie; Liudi Mulyo, Andreas; Vullum, Per Erik; Kim, Dong Chul; Ahtapodov, Lyubomir; Fimland, Bjørn-Ove; Kishino, Katsumi; Weman, Helge. (2019) GaN/AlGaN nanocolumn ultraviolet light-emitting diode using double-Layer graphene as substrate and transparent electrode. Nano Letters. volum 19 (3).
Academic article
Liudi Mulyo, Andreas; Rajpalke, Mohana; Kuroe, Haruhiko; Vullum, Per Erik; Weman, Helge; Fimland, Bjørn-Ove; Kishino, Katsumi. (2019) Erratum: Vertical GaN nanocolumns grown on graphene intermediated with a thin AlN buffer layer (Nanotechnology 30 015604). Nanotechnology. volum 30 (4).
Errata
Mukherjee, Anjan; Yun, Hoyeol; Shin, Dong Hoon; Nam, Jungtae; Munshi, Abdul Mazid; Dasa Lakshmi Narayana, Dheeraj; Fimland, Bjørn-Ove; Weman, Helge; Kim, Keun Soo; Lee, Sang Wook; Kim, Dong Chul. (2019) Single GaAs Nanowire/Graphene Hybrid Devices Fabricated by a Position-Controlled Microtransfer and an Imprinting Technique for an Embedded Structure. ACS Applied Materials & Interfaces. volum 11 (14).
Academic article
Ren, Dingding; Ahtapodov, Lyubomir; Van Helvoort, Antonius; Weman, Helge; Fimland, Bjørn-Ove. (2019) Epitaxially grown III-arsenide-antimonide nanowires for optoelectronic applications. Nanotechnology. volum 30 (29).
Academic article
Wang, Yunyu; Dheeraj, Dasa; Liu, Zhiqiang; Liang, Meng; Li, Yang; Yi, Xiaoyan; Wang, Junxi; Li, Jinmin; Weman, Helge. (2019) AlGaN Nanowires Grown on SiO2/Si (100) Using Graphene as a Buffer Layer. Crystal Growth & Design. volum 19 (10).
Academic article

2018

Liudi Mulyo, Andreas; Rajpalke, Mohana; Kuroe, Haruhiko; Vullum, Per Erik; Weman, Helge; Fimland, Bjørn-Ove; Kishino, Katsumi. (2018) Vertical GaN nanocolumns grown on graphene intermediated with a thin AlN buffer layer. Nanotechnology. volum 30:049601.
Academic article
Munshi, A Mazid; Kim, Dong-Chul; Heimdal, Carl Philip J; Heilmann, Martin; Christiansen, Silke; Vullum, Per Erik; Van Helvoort, Antonius; Weman, Helge. (2018) Selective area growth of AlGaN nanopyramid arrays on graphene by metal-organic vapor phase epitaxy. Applied Physics Letters. volum 133 (26).
Academic article
Ren, Dingding; Ahtapodov, Lyubomir; Nilsen, Julie Stene; Yang, Jianfeng; Gustafsson, Anders; Huh, Junghwan; Conibeer, Gavin J.; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2018) Single-mode near-infrared lasing in a GaAsSb-based nanowire superlattice at room temperature. Nano Letters. volum 18 (4).
Academic article
Ren, Fang; Yin, Yue; Wang, Yunyu; Liu, Zhiqiang; Meng, LIang; Ou, Haiyan; Ao, Jinping; Wei, Tongbo; Yan, Jiancheng; Yuan, Guodong; Yi, Xiaoyan; Wang, Junxi; Li, Jinmin; Dheeraj, Dasa; Weman, Helge. (2018) Direct Growth of AlGaN Nanorod LEDs on Graphene-Covered Si. Materials. volum 11.
Academic article

2017

Ahtapodov, Lyubomir; Kauko, Hanne; Munshi, Abdul Mazid; Fimland, Bjørn-Ove; Van Helvoort, Antonius; Weman, Helge. (2017) Determination of GaAs zinc blende/wurtzite band offsets utilizing GaAs nanowires with an axial GaAsSb insert. Journal of Applied Physics. volum 122 (24).
Academic article
Liudi Mulyo, Andreas; Konno, Yuta; Nilsen, Julie Stene; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge; Kishino, Katsumi. (2017) Growth study of self-assembled GaN nanocolumns on silica glass by plasma assisted molecular beam epitaxy. Journal of Crystal Growth. volum 480.
Academic article
Mosberg, Aleksander Buseth; Myklebost, Steinar; Ren, Dingding; Weman, Helge; Fimland, Bjørn-Ove; Van Helvoort, Antonius. (2017) Evaluating focused ion beam patterning for position-controlled nanowire growth using computer vision. Journal of Physics: Conference Series (JPCS). volum 902 (1).
Academic article
Nam, Jungtae; KIM, DONG CHUL; Yun, Hoyeol; Shin, Dong Hoon; Nam, Seungjin; Lee, Won Ki; Hwang, Jun Yeon; Lee, Sang Wook; Weman, Helge; Kim, Keun Soo. (2017) Chemical vapor deposition of graphene on platinum: Growth and substrate interaction. Carbon. volum 111.
Academic article

2016

Ahtapodov, Lyubomir; Munshi, Abdul Mazid; Nilsen, Julie Stene; Reinertsen, Johannes F; Dasa Lakshmi Narayana, Dheeraj; Fimland, Bjørn-Ove; Van Helvoort, Antonius; Weman, Helge. (2016) Effect of V/III ratio on the structural and optical properties of self-catalysed GaAs nanowires. Nanotechnology. volum 27 (44).
Academic article
Fauske, Vidar Tonaas; Erlbeck, Maximilian; Huh, Junghwan; KIM, DONG CHUL; Munshi, Abdul Mazid; Dasa Lakshmi Narayana, Dheeraj; Weman, Helge; Fimland, Bjørn-Ove; Van Helvoort, Antonius. (2016) In situ electronic probing of semiconducting nanowires in an electron microscope. Journal of Microscopy. volum 262 (2).
Academic article
Fauske, Vidar Tonaas; Huh, Junghwan; Divitini, Giorgio; Dasa Lakshmi Narayana, Dheeraj; Munshi, Abdul Mazid; Ducati, Caterina; Weman, Helge; Fimland, Bjørn-Ove; Van Helvoort, Antonius. (2016) In situ heat-induced replacement of GaAs Nanowires with Au. Nano Letters. volum 16 (5).
Academic article
Heilmann, Martin; Munshi, Abdul Mazid; Sarau, George; Göbelt, Manuela; Tessarek, Christian; Fauske, Vidar Tonaas; Van Helvoort, Antonius; Yang, J.; Latzel, Michael; Hoffmann, B; Conibeer, G; Weman, Helge; Christiansen, Silke. (2016) Vertically Oriented Growth of GaN Nanorods on Si Using Graphene as an Atomically Thin Buffer Layer. Nano Letters. volum 16 (6).
Academic article
Huh, Junghwan; KIM, DONG CHUL; Munshi, A Mazid; Dheeraj, D.L.; Jang, Doyoung; Kim, Gyu-Tae; Fimland, Bjørn-Ove; Weman, Helge. (2016) Low frequency noise in single GaAsSb nanowires with self-induced compositional gradients. Nanotechnology. volum 27 (38).
Academic article
Høiaas, Ida Marie; KIM, DONG CHUL; Weman, Helge. (2016) Fabrication of Si(111) crystalline thin film on graphene by aluminum-induced crystallization. Applied Physics Letters. volum 108.
Academic article
Ren, Dingding; Dheeraj, D.L.; Jin, Chengjun; Nilsen, Julie Stene; Huh, Junghwan; Reinertsen, Johannes F; Mazid, A. M.; Gustafsson, Anders; Van Helvoort, Antonius; Weman, Helge; Fimland, Bjørn-Ove. (2016) New Insights into the Origins of Sb-Induced Effects on Self-Catalyzed GaAsSb Nanowire Arrays. Nano Letters. volum 16 (2).
Academic article
Ren, Dingding; Huh, Junghwan; Dheeraj, D.L.; Weman, Helge; Fimland, Bjørn-Ove. (2016) Influence of Pitch on the Morphology and Luminescence Properties of Self-Catalyzed GaAsSb Nanowire Arrays. Applied Physics Letters. volum 109.
Academic article
Ren, Dingding; Høiaas, Ida Marie; Reinertsen, Johannes F; Dasa Lakshmi Narayana, Dheeraj; Munshi, Abdul Mazid; KIM, DONG CHUL; Weman, Helge; Fimland, Bjørn-Ove. (2016) Growth optimization for self-catalyzed GaAs-based nanowires on metal-induced crystallized amorphous substrate. Journal of Vacuum Science and Technology B:Nanotechnology and Microelectronics. volum 34 (2).
Academic article

2015

Huh, Junghwan; Yun, H.; KIM, DONG CHUL; Munshi, Abdul Mazid; Dasa Lakshmi Narayana, Dheeraj; Kauko, Hanne; Van Helvoort, Antonius; Lee, S.W.; Fimland, Bjørn-Ove; Weman, Helge. (2015) Rectifying Single GaAsSb Nanowire Devices Based on Self-Induced Compositional Gradients. Nano Letters. volum 15 (6).
Academic article
Nilsen, Julie Stene; Reinertsen, Johannes F; Mosberg, Aleksander Buseth; Fauske, Vidar Tonaas; Munshi, Abdul Mazid; Dasa Lakshmi Narayana, Dheeraj; Fimland, Bjørn-Ove; Weman, Helge; Van Helvoort, Antonius. (2015) Radial composition variations in the shells of GaAs/AlGaAs core-shell nanowires. Journal of Physics: Conference Series (JPCS). volum 644:012007.
Academic article
Svendsen, Guro Kristin; Skaar, Johannes; Weman, Helge; Dupertuis, Marc-André. (2015) Symmetries and optical transitions of hexagonal quantum dots in GaAs/AlGaAs nanowires. Physical Review B. Condensed Matter and Materials Physics. volum 92 (20).
Academic article

2014

Fauske, Vidar Tonaas; KIM, DONG CHUL; Munshi, Abdul Mazid; Dasa Lakshmi Narayana, Dheeraj; Fimland, Bjørn-Ove; Weman, Helge; Van Helvoort, Antonius. (2014) In-situ electrical and structural characterization of individual GaAs nanowires. Journal of Physics: Conference Series (JPCS). volum 522.
Academic article
Munshi, Abdul Mazid; Dasa Lakshmi Narayana, Dheeraj; Fauske, Vidar Tonaas; KIM, DONG CHUL; Huh, Junghwan; Reinertsen, Johannes F; Ahtapodov, Lyubomir; Lee, K. D.; Heidari, B.; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2014) Position-Controlled Uniform GaAs Nanowires on Silicon using Nanoimprint Lithography. Nano Letters. volum 14 (2).
Academic article
Signorello, G.; Lörtscher, E; Khomyakov, P.A.; Karg, S.; Dasa Lakshmi Narayana, Dheeraj; Gotsmann, B.; Weman, Helge; Riel, H.. (2014) Inducing a direct-to-pseudodirect bandgap transition in wurtzite GaAs nanowires with uniaxial stress. Nature Communications. volum 5 (3655).
Academic article

2013

Dasa Lakshmi Narayana, Dheeraj; Munshi, Abdul Mazid; Christoffersen, Ole Morten; KIM, DONG CHUL; Signorello, Giovanni; Riel, H; Van Helvoort, Antonius; Weman, Helge; Fimland, Bjørn-Ove. (2013) Comparison of Be-doped GaAs nanowires grown by Au- and Ga-assisted molecular beam epitaxy. Journal of Crystal Growth. volum 378.
Academic article
Dasa Lakshmi Narayana, Dheeraj; Munshi, Abdul Mazid; Scheffler, Martha; Van Helvoort, Antonius; Weman, Helge; Fimland, Bjørn-Ove. (2013) Controlling crystal phases in GaAs nanowires grown by Au-assisted molecular beam epitaxy. Nanotechnology. volum 24 (1).
Academic article
Ghalamestani, Sepideh Gorji; Munshi, Abdul Mazid; Dasa Lakshmi Narayana, Dheeraj; Fimland, Bjørn-Ove; Weman, Helge; Dick, Kimberly A. (2013) Self-catalyzed MBE grown GaAs/GaAsxSb1-x core-shell nanowires in ZB and WZ crystal structures. Nanotechnology. volum 24 (40).
Academic article
Kauko, Hanne; Grieb, Tim; Bjørge, Ruben; Schowalter, M.; Munshi, Abdul Mazid; Weman, Helge; Rosenauer, A.; Van Helvoort, Antonius. (2013) Compositional characterization of GaAs/GaAsSb nanowires by quantitative HAADF-STEM. Micron. volum 44.
Academic literature review
KIM, DONG CHUL; Dasa Lakshmi Narayana, Dheeraj; Fimland, Bjørn-Ove; Weman, Helge. (2013) Polarization dependent photocurrent spectroscopy of single wurtzite GaAs/AlGaAs core-shell nanowires. Applied Physics Letters. volum 102 (14:142107).
Academic article
Lim, Cheng Guan; Weman, Helge. (2013) Numerical Analysis and Device Optimization of Radial p-n Junction GaAs/AlGaAs Core-Shell Nanowire Solar Cells. Proceedings of the International Conference on Numerical Simulation of Optoelectronic Devices.
Abstract
Munshi, Abdul Mazid; Dasa Lakshmi Narayana, Dheeraj; Todorovic, Jelena; Van Helvoort, Antonius; Weman, Helge; Fimland, Bjørn-Ove. (2013) Crystal phase engineering in self-catalyzed GaAs and GaAs/GaAsSb nanowires grown on Si(111). Journal of Crystal Growth. volum 372.
Academic article
Munshi, Abdul Mazid; Weman, Helge. (2013) Advances in semiconductor nanowire growth on graphene. Physica Status Solidi. Rapid Research Letters. volum 7 (10).
Academic literature review
Todorovic, Jelena; Kauko, Hanne; Ahtapodov, Lyubomir; Anthonysamy, Fervin Moses; Olk, Phillip; Dasa Lakshmi Narayana, Dheeraj; Fimland, Bjørn-Ove; Weman, Helge; Van Helvoort, Antonius. (2013) The effects of Sb concentration variation on the optical properties of GaAsSb/GaAs heterostructured nanowires. Semiconductor Science and Technology. volum 28 (11).
Academic article
Weigand, Christian Carl; Crisp, Ryan; Ladam, Cecile; Furtak, Tom; Collins, Reuben; Grepstad, Jostein; Weman, Helge. (2013) Electrical, optical and structural properties of Al-doped ZnO thin films grown on GaAs(111)B substrates by pulsed laser deposition. Thin Solid Films. volum 545.
Academic article

2012

Ahtapodov, Lyubomir; Todorovic, Jelena; Olk, Phillip; Mjåland, Terje Sund; Slåttnes, Patrick Rene Tollefsen; Dasa Lakshmi Narayana, Dheeraj; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2012) A Story Told by a Single Nanowire: Optical Properties of Wurtzite GaAs. Nano Letters. volum 12 (12).
Academic article
Munshi, Abdul Mazid; Dasa Lakshmi Narayana, Dheeraj; Fauske, Vidar Tonaas; DONG CHUL, KIM; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2012) Vertically Aligned GaAs Nanowires on Graphite and Few-Layer Graphene: Generic Model and Epitaxial Growth. Nano Letters. volum 12 (9).
Academic article
Svendsen, Guro Kristin; Weman, Helge; Skaar, Johannes. (2012) Investigations of Bragg reflectors in nanowire lasers. Journal of Applied Physics. volum 111 (12).
Academic article
Weigand, Christian Carl; Tveit, Johannes; Ladam, Cecile; Holmestad, Randi; Grepstad, Jostein; Weman, Helge. (2012) Epitaxial relationships of ZnO nanostructures grown by Au-assisted pulsed laser deposition on c- and a-plane sapphire. Journal of Crystal Growth. volum 355 (1).
Academic article

2011

Anthonysamy, Fervin Moses; Hoang, Thang Ba; Ahtapodov, Lyubomir; Dasa Lakshmi Narayana, Dheeraj; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2011) Photoluminescence Polarization Anisotropy in a Single Heterostructured III-V Nanowire with Mixed Crystal Phases. AIP Conference Proceedings. volum 1399.
Academic article
DONG CHUL, KIM; Ahtapodov, Lyubomir; Boe, A.B.; Choi, J. W.; Ji, H; Kim, G. T.; Anthonysamy, Fervin Moses; Dasa Lakshmi Narayana, Dheeraj; Fimland, Bjørn-Ove; Weman, Helge. (2011) Photocurrent Spectroscopy of Single Wurtzite GaAs Nanowires. AIP Conference Proceedings. volum 1399.
Academic article
Svendsen, Guro Kristin; Weman, Helge; Skaar, Johannes. (2011) Model for reflection and transmission matrices of nanowire end facets. Journal of Applied Physics. volum 109 (10).
Academic article
Todorovic, Jelena; Anthonysamy, Fervin Moses; Dasa Lakshmi Narayana, Dheeraj; Olk, Phillip; Fimland, Bjørn-Ove; Weman, Helge; Van Helvoort, Antonius. (2011) Correlated micro-photoluminescence and electron microscopy study of a heterostructured semiconductor nanowire. Journal of Physics: Conference Series (JPCS). volum 326.
Academic article
Todorovic, Jelena; Anthonysamy, Fervin Moses; Karlberg, Thomas Andre; Olk, Phillip; Dasa Lakshmi Narayana, Dheeraj; Fimland, Bjørn-Ove; Weman, Helge; Van Helvoort, Antonius. (2011) Correlated micro-photoluminescence and electron microscopy studies of the same individual heterostructured semiconductor nanowires. Nanotechnology. volum 22 (32).
Academic article
Weigand, Christian Carl; Bergren, M.R.; Ladam, Cecile; Tveit, Johannes; Holmestad, Randi; Vullum, Per Erik; Walmsley, John; Dahl, Øystein; Furtak, T.E.; Collins, R.T.; Grepstad, Jostein; Weman, Helge. (2011) Formation of ZnO Nanosheets Grown by Catalyst-Assisted Pulsed Laser Deposition. Crystal Growth & Design. volum 11 (12).
Academic article
Weigand, Christian Carl; Skåre, Daniel; Ladam, Cecile; Grepstad, Jostein; Weman, Helge. (2011) Effects of substrate annealing on the gold-catalyzed growth of ZnO nanostructures. Nanoscale Research Letters. volum 6.
Academic article

2010

Dasa, Lakshmi Narayana; Zhou, Hailong; Anthonysamy, Fervin Moses; Hoang, Thang Ba; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2010) Growth of heterostructured III-V nanowires by molecular beam epitaxy for photonic applications. Proceedings of SPIE, the International Society for Optical Engineering. volum 7608.
Academic article
Dasa, Lakshmi Narayana; Zhou, Hailong; Anthonysamy, Fervin Moses; Hoang, Thang Ba; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2010) Heterostructured III-V Nanowires with Mixed Crystal Phases Grown by Au-assisted Molecular Beam Epitaxy. Nanowires.
Academic chapter/article/Conference paper
Hoang, Thang Ba; Anthonysamy, Fervin Moses; Ahtapodov, Lyubomir; Zhou, Hailong; Dasa, Lakshmi Narayana; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2010) Engineering Parallel and Perpendicular Polarized Photoluminescence from a Single Semiconductor Nanowire by Crystal Phase Control. Nano Letters. volum 10 (8).
Academic article
Van Helvoort, Antonius; Dasa, Lakshmi Narayana; Zhou, Hailong; Grønsberg, Sondre; Patriarche, G; Fimland, Bjørn-Ove; Weman, Helge. (2010) Dark field transmission electron microscopy techniques for structural characterization of nanowire heterostructures. Journal of Physics: Conference Series (JPCS). volum 241.
Academic article

2009

Anthonysamy, Fervin Moses; Hoang, Thang Ba; Dasa Lakshmi Narayana, Dheeraj; Zhou, Hailong; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2009) Micro-photoluminescence study of single GaAsSb/GaAs radial and axial heterostructured core-shell nanowires. IOP Conference Series: Earth and Environmental Science (EES). volum 6:012001.
Academic article
Anthonysamy, Fervin Moses; Hoang, Thang Ba; Dasa, Lakshmi Narayana; Zhou, Hailong; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2009) Micro-photoluminescence study of single GaAsSb/GaAs radial and axial heterostructured core-shell nanowires. Journal of Physics: Conference Series (JPCS).
Academic article
Dasa, Lakshmi Narayana; Patriarche, G.; Zhou, Hailong; Harmand, J.C.; Weman, Helge; Fimland, Bjørn-Ove. (2009) Growth and structural characterization of GaAs/GaAsSb axial heterostructured nanowires. Journal of Crystal Growth. volum 311 (7).
Academic article
Hoang, Thang Ba; Anthonysamy, Fervin Moses; Zhou, Hailong; Dasa, Lakshmi Narayana; Fimland, Bjørn-Ove; Weman, Helge. (2009) Observation of free exciton photoluminescence emission from single wurtzite GaAs nanowires. Applied Physics Letters. volum 94 (13).
Academic article
Hoang, Thang Ba; Zhou, Hailong; Anthonysamy, Fervin Moses; Dasa, Lakshmi Narayana; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2009) Optical properties of single wurtzite GaAs nanowiresand GaAs nanowires with GaAsSb inserts. Materials Research Society Symposium Proceedings. volum 1144.
Academic article
Weigand, Christian Carl; Bergren, Matt; Ladam, Cecile; Vullum, Per Erik; Walmsley, John C; Fagerberg, Ragnar; Furtak, Tom; Collins, Reuben; Grepstad, Jostein; Weman, Helge. (2009) Characterization of ZnO Nanostructures Grown by Pulsed Laser Deposition. Materials Research Society Symposium Proceedings. volum 1174 (V07).
Academic article
Weman, Helge; Palmgren, S.; Karlsson, F.K.; Rudra, A.; Kapon, E.; Dheeraj, D.L.; Fimland, Bjørn-Ove; Harmand, J.C.. (2009) Semiconductor quantum-wires and nano-wires for optoelectronic applications. Journal of materials science. Materials in electronics. volum 20.
Academic article
Zhou, Hailong; Hoang, Thang Ba; Dasa, Lakshmi Narayana; Van Helvoort, Antonius; Liu, L; Harmand, J.C.; Fimland, Bjørn-Ove; Weman, Helge. (2009) Wurtzite GaAs/AlGaAs core-shell nanowires grown by molecular beam epitaxy. Nanotechnology. volum 20 (41).
Academic article

2008

Dasa, Lakshmi Narayana; Patriarche, G.; Zhou, Hailong; Hoang, Thang Ba; Anthonysamy, Fervin Moses; Grønsberg, Sondre; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2008) Growth and characterization of GaAs nanowires with defect-free zinc blende GaAsSb inserts. Nano Letters. volum 8 (12).
Academic article
Dasa, Lakshmi Narayana; Patriarche, G; Largeau, L; Zhou, Hailong; Van Helvoort, Antonius; Glas, F; Harmand, JC; Fimland, Bjørn-Ove; Weman, Helge. (2008) Zinc blende GaAsSb nanowires grown by molecular beam epitaxy. Nanotechnology. volum 19.
Academic article
Weigand, Christian Carl; Bergren, Matt; Valset, Kjetil; Carey, David; Fagerberg, Ragnar; Ladam, Cecile; Grepstad, Jostein; Weman, Helge; Furtak, Tom; Collins, Reuben. (2008) Characterization of ZnO Layers Grown by Pulsed Laser Deposition for Hybrid Inorganic/Organic Solar Cells. The Proceedings of the 23rd European Photovoltaic Solar Energy Conference.
Academic chapter/article/Conference paper

2007

Karlsson, F.K.; Weman, Helge; Leifer, K.; Rudra, A.; Kapon, E.; Lyo, S.K.. (2007) Strongly reduced exciton transfer between parallel quantum wires. Applied Physics Letters. volum 90 (10).
Academic article

2006

Palmgren, S.; Weman, Helge; Schoenberg, A.; Karlsson, F.K.; Dupertuis, M.-A.; Leifer, K.; Rudra, A.; Kapon, E.. (2006) Polarization-resolved optical absorption in single V-groove quantum wires. Applied Physics Letters. volum 89 (19).
Academic article
Reichardt, H.; Leifer, K.; Pelucchi, E.; Karlsson, F.K.; Weman, Helge; Rudra, A.; Kapon, E.. (2006) Influence of long-range substrate roughness on disorder in V-groove quantum wire structures. Journal of Applied Physics. volum 100 (12).
Academic article

2005

Karlsson, F.K.; Dupertuis, M.-A.; Weman, Helge; Kapon, E.. (2005) The fractional-dimensional excitonic absorption theory applied to real V-groove quantum wires. AIP Conference Proceedings. volum 772.
Academic article
Karlsson, F.K.; Weman, Helge; Leifer, K.; Rudra, A.; Kapon, E.. (2005) Carrier tunneling between parallel GaAs/AlGaAs quantum wires. AIP Conference Proceedings. volum 772.
Academic article

Journal publications

Liudi Mulyo, Andreas; Mukherjee, Anjan; Høiaas, Ida Marie; Ahtapodov, Lyubomir; Nilsen, Tron Arne; Toftevaag, Håvard Hem; Vullum, Per Erik; Kishino, Katsumi; Weman, Helge; Fimland, Bjørn-Ove. (2021) Graphene-Based Transparent Conducting Substrates for GaN/AlGaN Nanocolumn Flip-Chip Ultraviolet Light-Emitting Diodes. ACS Applied Nano Materials. volum 4 (9).
Academic article
Mukherjee, Anjan; Ren, Dingding; Vullum, Per Erik; Huh, Junghwan; Fimland, Bjørn-Ove; Weman, Helge. (2021) GaAs/AlGaAs Nanowire Array Solar Cell Grown on Si with Ultrahigh Power-per-Weight Ratio. ACS Photonics. volum 8 (8).
Academic article
Liudi Mulyo, Andreas; Rajpalke, Mohana; Vullum, Per Erik; Weman, Helge; Kishino, Katsumi; Fimland, Bjørn-Ove. (2020) The influence of AlN buffer layer on the growth of self-assembled GaN nanocolumns on graphene. Scientific Reports. volum 10 (853).
Academic article
Høiaas, Ida Marie; Liudi Mulyo, Andreas; Vullum, Per Erik; Kim, Dong Chul; Ahtapodov, Lyubomir; Fimland, Bjørn-Ove; Kishino, Katsumi; Weman, Helge. (2019) GaN/AlGaN nanocolumn ultraviolet light-emitting diode using double-Layer graphene as substrate and transparent electrode. Nano Letters. volum 19 (3).
Academic article
Liudi Mulyo, Andreas; Rajpalke, Mohana; Kuroe, Haruhiko; Vullum, Per Erik; Weman, Helge; Fimland, Bjørn-Ove; Kishino, Katsumi. (2019) Erratum: Vertical GaN nanocolumns grown on graphene intermediated with a thin AlN buffer layer (Nanotechnology 30 015604). Nanotechnology. volum 30 (4).
Errata
Mukherjee, Anjan; Yun, Hoyeol; Shin, Dong Hoon; Nam, Jungtae; Munshi, Abdul Mazid; Dasa Lakshmi Narayana, Dheeraj; Fimland, Bjørn-Ove; Weman, Helge; Kim, Keun Soo; Lee, Sang Wook; Kim, Dong Chul. (2019) Single GaAs Nanowire/Graphene Hybrid Devices Fabricated by a Position-Controlled Microtransfer and an Imprinting Technique for an Embedded Structure. ACS Applied Materials & Interfaces. volum 11 (14).
Academic article
Ren, Dingding; Ahtapodov, Lyubomir; Van Helvoort, Antonius; Weman, Helge; Fimland, Bjørn-Ove. (2019) Epitaxially grown III-arsenide-antimonide nanowires for optoelectronic applications. Nanotechnology. volum 30 (29).
Academic article
Wang, Yunyu; Dheeraj, Dasa; Liu, Zhiqiang; Liang, Meng; Li, Yang; Yi, Xiaoyan; Wang, Junxi; Li, Jinmin; Weman, Helge. (2019) AlGaN Nanowires Grown on SiO2/Si (100) Using Graphene as a Buffer Layer. Crystal Growth & Design. volum 19 (10).
Academic article
Liudi Mulyo, Andreas; Rajpalke, Mohana; Kuroe, Haruhiko; Vullum, Per Erik; Weman, Helge; Fimland, Bjørn-Ove; Kishino, Katsumi. (2018) Vertical GaN nanocolumns grown on graphene intermediated with a thin AlN buffer layer. Nanotechnology. volum 30:049601.
Academic article
Munshi, A Mazid; Kim, Dong-Chul; Heimdal, Carl Philip J; Heilmann, Martin; Christiansen, Silke; Vullum, Per Erik; Van Helvoort, Antonius; Weman, Helge. (2018) Selective area growth of AlGaN nanopyramid arrays on graphene by metal-organic vapor phase epitaxy. Applied Physics Letters. volum 133 (26).
Academic article
Ren, Dingding; Ahtapodov, Lyubomir; Nilsen, Julie Stene; Yang, Jianfeng; Gustafsson, Anders; Huh, Junghwan; Conibeer, Gavin J.; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2018) Single-mode near-infrared lasing in a GaAsSb-based nanowire superlattice at room temperature. Nano Letters. volum 18 (4).
Academic article
Ren, Fang; Yin, Yue; Wang, Yunyu; Liu, Zhiqiang; Meng, LIang; Ou, Haiyan; Ao, Jinping; Wei, Tongbo; Yan, Jiancheng; Yuan, Guodong; Yi, Xiaoyan; Wang, Junxi; Li, Jinmin; Dheeraj, Dasa; Weman, Helge. (2018) Direct Growth of AlGaN Nanorod LEDs on Graphene-Covered Si. Materials. volum 11.
Academic article
Ahtapodov, Lyubomir; Kauko, Hanne; Munshi, Abdul Mazid; Fimland, Bjørn-Ove; Van Helvoort, Antonius; Weman, Helge. (2017) Determination of GaAs zinc blende/wurtzite band offsets utilizing GaAs nanowires with an axial GaAsSb insert. Journal of Applied Physics. volum 122 (24).
Academic article
Liudi Mulyo, Andreas; Konno, Yuta; Nilsen, Julie Stene; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge; Kishino, Katsumi. (2017) Growth study of self-assembled GaN nanocolumns on silica glass by plasma assisted molecular beam epitaxy. Journal of Crystal Growth. volum 480.
Academic article
Mosberg, Aleksander Buseth; Myklebost, Steinar; Ren, Dingding; Weman, Helge; Fimland, Bjørn-Ove; Van Helvoort, Antonius. (2017) Evaluating focused ion beam patterning for position-controlled nanowire growth using computer vision. Journal of Physics: Conference Series (JPCS). volum 902 (1).
Academic article
Nam, Jungtae; KIM, DONG CHUL; Yun, Hoyeol; Shin, Dong Hoon; Nam, Seungjin; Lee, Won Ki; Hwang, Jun Yeon; Lee, Sang Wook; Weman, Helge; Kim, Keun Soo. (2017) Chemical vapor deposition of graphene on platinum: Growth and substrate interaction. Carbon. volum 111.
Academic article
Ahtapodov, Lyubomir; Munshi, Abdul Mazid; Nilsen, Julie Stene; Reinertsen, Johannes F; Dasa Lakshmi Narayana, Dheeraj; Fimland, Bjørn-Ove; Van Helvoort, Antonius; Weman, Helge. (2016) Effect of V/III ratio on the structural and optical properties of self-catalysed GaAs nanowires. Nanotechnology. volum 27 (44).
Academic article
Fauske, Vidar Tonaas; Erlbeck, Maximilian; Huh, Junghwan; KIM, DONG CHUL; Munshi, Abdul Mazid; Dasa Lakshmi Narayana, Dheeraj; Weman, Helge; Fimland, Bjørn-Ove; Van Helvoort, Antonius. (2016) In situ electronic probing of semiconducting nanowires in an electron microscope. Journal of Microscopy. volum 262 (2).
Academic article
Fauske, Vidar Tonaas; Huh, Junghwan; Divitini, Giorgio; Dasa Lakshmi Narayana, Dheeraj; Munshi, Abdul Mazid; Ducati, Caterina; Weman, Helge; Fimland, Bjørn-Ove; Van Helvoort, Antonius. (2016) In situ heat-induced replacement of GaAs Nanowires with Au. Nano Letters. volum 16 (5).
Academic article
Heilmann, Martin; Munshi, Abdul Mazid; Sarau, George; Göbelt, Manuela; Tessarek, Christian; Fauske, Vidar Tonaas; Van Helvoort, Antonius; Yang, J.; Latzel, Michael; Hoffmann, B; Conibeer, G; Weman, Helge; Christiansen, Silke. (2016) Vertically Oriented Growth of GaN Nanorods on Si Using Graphene as an Atomically Thin Buffer Layer. Nano Letters. volum 16 (6).
Academic article
Huh, Junghwan; KIM, DONG CHUL; Munshi, A Mazid; Dheeraj, D.L.; Jang, Doyoung; Kim, Gyu-Tae; Fimland, Bjørn-Ove; Weman, Helge. (2016) Low frequency noise in single GaAsSb nanowires with self-induced compositional gradients. Nanotechnology. volum 27 (38).
Academic article
Høiaas, Ida Marie; KIM, DONG CHUL; Weman, Helge. (2016) Fabrication of Si(111) crystalline thin film on graphene by aluminum-induced crystallization. Applied Physics Letters. volum 108.
Academic article
Ren, Dingding; Dheeraj, D.L.; Jin, Chengjun; Nilsen, Julie Stene; Huh, Junghwan; Reinertsen, Johannes F; Mazid, A. M.; Gustafsson, Anders; Van Helvoort, Antonius; Weman, Helge; Fimland, Bjørn-Ove. (2016) New Insights into the Origins of Sb-Induced Effects on Self-Catalyzed GaAsSb Nanowire Arrays. Nano Letters. volum 16 (2).
Academic article
Ren, Dingding; Huh, Junghwan; Dheeraj, D.L.; Weman, Helge; Fimland, Bjørn-Ove. (2016) Influence of Pitch on the Morphology and Luminescence Properties of Self-Catalyzed GaAsSb Nanowire Arrays. Applied Physics Letters. volum 109.
Academic article
Ren, Dingding; Høiaas, Ida Marie; Reinertsen, Johannes F; Dasa Lakshmi Narayana, Dheeraj; Munshi, Abdul Mazid; KIM, DONG CHUL; Weman, Helge; Fimland, Bjørn-Ove. (2016) Growth optimization for self-catalyzed GaAs-based nanowires on metal-induced crystallized amorphous substrate. Journal of Vacuum Science and Technology B:Nanotechnology and Microelectronics. volum 34 (2).
Academic article
Huh, Junghwan; Yun, H.; KIM, DONG CHUL; Munshi, Abdul Mazid; Dasa Lakshmi Narayana, Dheeraj; Kauko, Hanne; Van Helvoort, Antonius; Lee, S.W.; Fimland, Bjørn-Ove; Weman, Helge. (2015) Rectifying Single GaAsSb Nanowire Devices Based on Self-Induced Compositional Gradients. Nano Letters. volum 15 (6).
Academic article
Nilsen, Julie Stene; Reinertsen, Johannes F; Mosberg, Aleksander Buseth; Fauske, Vidar Tonaas; Munshi, Abdul Mazid; Dasa Lakshmi Narayana, Dheeraj; Fimland, Bjørn-Ove; Weman, Helge; Van Helvoort, Antonius. (2015) Radial composition variations in the shells of GaAs/AlGaAs core-shell nanowires. Journal of Physics: Conference Series (JPCS). volum 644:012007.
Academic article
Svendsen, Guro Kristin; Skaar, Johannes; Weman, Helge; Dupertuis, Marc-André. (2015) Symmetries and optical transitions of hexagonal quantum dots in GaAs/AlGaAs nanowires. Physical Review B. Condensed Matter and Materials Physics. volum 92 (20).
Academic article
Fauske, Vidar Tonaas; KIM, DONG CHUL; Munshi, Abdul Mazid; Dasa Lakshmi Narayana, Dheeraj; Fimland, Bjørn-Ove; Weman, Helge; Van Helvoort, Antonius. (2014) In-situ electrical and structural characterization of individual GaAs nanowires. Journal of Physics: Conference Series (JPCS). volum 522.
Academic article
Munshi, Abdul Mazid; Dasa Lakshmi Narayana, Dheeraj; Fauske, Vidar Tonaas; KIM, DONG CHUL; Huh, Junghwan; Reinertsen, Johannes F; Ahtapodov, Lyubomir; Lee, K. D.; Heidari, B.; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2014) Position-Controlled Uniform GaAs Nanowires on Silicon using Nanoimprint Lithography. Nano Letters. volum 14 (2).
Academic article
Signorello, G.; Lörtscher, E; Khomyakov, P.A.; Karg, S.; Dasa Lakshmi Narayana, Dheeraj; Gotsmann, B.; Weman, Helge; Riel, H.. (2014) Inducing a direct-to-pseudodirect bandgap transition in wurtzite GaAs nanowires with uniaxial stress. Nature Communications. volum 5 (3655).
Academic article
Dasa Lakshmi Narayana, Dheeraj; Munshi, Abdul Mazid; Christoffersen, Ole Morten; KIM, DONG CHUL; Signorello, Giovanni; Riel, H; Van Helvoort, Antonius; Weman, Helge; Fimland, Bjørn-Ove. (2013) Comparison of Be-doped GaAs nanowires grown by Au- and Ga-assisted molecular beam epitaxy. Journal of Crystal Growth. volum 378.
Academic article
Dasa Lakshmi Narayana, Dheeraj; Munshi, Abdul Mazid; Scheffler, Martha; Van Helvoort, Antonius; Weman, Helge; Fimland, Bjørn-Ove. (2013) Controlling crystal phases in GaAs nanowires grown by Au-assisted molecular beam epitaxy. Nanotechnology. volum 24 (1).
Academic article
Ghalamestani, Sepideh Gorji; Munshi, Abdul Mazid; Dasa Lakshmi Narayana, Dheeraj; Fimland, Bjørn-Ove; Weman, Helge; Dick, Kimberly A. (2013) Self-catalyzed MBE grown GaAs/GaAsxSb1-x core-shell nanowires in ZB and WZ crystal structures. Nanotechnology. volum 24 (40).
Academic article
Kauko, Hanne; Grieb, Tim; Bjørge, Ruben; Schowalter, M.; Munshi, Abdul Mazid; Weman, Helge; Rosenauer, A.; Van Helvoort, Antonius. (2013) Compositional characterization of GaAs/GaAsSb nanowires by quantitative HAADF-STEM. Micron. volum 44.
Academic literature review
KIM, DONG CHUL; Dasa Lakshmi Narayana, Dheeraj; Fimland, Bjørn-Ove; Weman, Helge. (2013) Polarization dependent photocurrent spectroscopy of single wurtzite GaAs/AlGaAs core-shell nanowires. Applied Physics Letters. volum 102 (14:142107).
Academic article
Lim, Cheng Guan; Weman, Helge. (2013) Numerical Analysis and Device Optimization of Radial p-n Junction GaAs/AlGaAs Core-Shell Nanowire Solar Cells. Proceedings of the International Conference on Numerical Simulation of Optoelectronic Devices.
Abstract
Munshi, Abdul Mazid; Dasa Lakshmi Narayana, Dheeraj; Todorovic, Jelena; Van Helvoort, Antonius; Weman, Helge; Fimland, Bjørn-Ove. (2013) Crystal phase engineering in self-catalyzed GaAs and GaAs/GaAsSb nanowires grown on Si(111). Journal of Crystal Growth. volum 372.
Academic article
Munshi, Abdul Mazid; Weman, Helge. (2013) Advances in semiconductor nanowire growth on graphene. Physica Status Solidi. Rapid Research Letters. volum 7 (10).
Academic literature review
Todorovic, Jelena; Kauko, Hanne; Ahtapodov, Lyubomir; Anthonysamy, Fervin Moses; Olk, Phillip; Dasa Lakshmi Narayana, Dheeraj; Fimland, Bjørn-Ove; Weman, Helge; Van Helvoort, Antonius. (2013) The effects of Sb concentration variation on the optical properties of GaAsSb/GaAs heterostructured nanowires. Semiconductor Science and Technology. volum 28 (11).
Academic article
Weigand, Christian Carl; Crisp, Ryan; Ladam, Cecile; Furtak, Tom; Collins, Reuben; Grepstad, Jostein; Weman, Helge. (2013) Electrical, optical and structural properties of Al-doped ZnO thin films grown on GaAs(111)B substrates by pulsed laser deposition. Thin Solid Films. volum 545.
Academic article
Ahtapodov, Lyubomir; Todorovic, Jelena; Olk, Phillip; Mjåland, Terje Sund; Slåttnes, Patrick Rene Tollefsen; Dasa Lakshmi Narayana, Dheeraj; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2012) A Story Told by a Single Nanowire: Optical Properties of Wurtzite GaAs. Nano Letters. volum 12 (12).
Academic article
Munshi, Abdul Mazid; Dasa Lakshmi Narayana, Dheeraj; Fauske, Vidar Tonaas; DONG CHUL, KIM; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2012) Vertically Aligned GaAs Nanowires on Graphite and Few-Layer Graphene: Generic Model and Epitaxial Growth. Nano Letters. volum 12 (9).
Academic article
Svendsen, Guro Kristin; Weman, Helge; Skaar, Johannes. (2012) Investigations of Bragg reflectors in nanowire lasers. Journal of Applied Physics. volum 111 (12).
Academic article
Weigand, Christian Carl; Tveit, Johannes; Ladam, Cecile; Holmestad, Randi; Grepstad, Jostein; Weman, Helge. (2012) Epitaxial relationships of ZnO nanostructures grown by Au-assisted pulsed laser deposition on c- and a-plane sapphire. Journal of Crystal Growth. volum 355 (1).
Academic article
Anthonysamy, Fervin Moses; Hoang, Thang Ba; Ahtapodov, Lyubomir; Dasa Lakshmi Narayana, Dheeraj; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2011) Photoluminescence Polarization Anisotropy in a Single Heterostructured III-V Nanowire with Mixed Crystal Phases. AIP Conference Proceedings. volum 1399.
Academic article
DONG CHUL, KIM; Ahtapodov, Lyubomir; Boe, A.B.; Choi, J. W.; Ji, H; Kim, G. T.; Anthonysamy, Fervin Moses; Dasa Lakshmi Narayana, Dheeraj; Fimland, Bjørn-Ove; Weman, Helge. (2011) Photocurrent Spectroscopy of Single Wurtzite GaAs Nanowires. AIP Conference Proceedings. volum 1399.
Academic article
Svendsen, Guro Kristin; Weman, Helge; Skaar, Johannes. (2011) Model for reflection and transmission matrices of nanowire end facets. Journal of Applied Physics. volum 109 (10).
Academic article
Todorovic, Jelena; Anthonysamy, Fervin Moses; Dasa Lakshmi Narayana, Dheeraj; Olk, Phillip; Fimland, Bjørn-Ove; Weman, Helge; Van Helvoort, Antonius. (2011) Correlated micro-photoluminescence and electron microscopy study of a heterostructured semiconductor nanowire. Journal of Physics: Conference Series (JPCS). volum 326.
Academic article
Todorovic, Jelena; Anthonysamy, Fervin Moses; Karlberg, Thomas Andre; Olk, Phillip; Dasa Lakshmi Narayana, Dheeraj; Fimland, Bjørn-Ove; Weman, Helge; Van Helvoort, Antonius. (2011) Correlated micro-photoluminescence and electron microscopy studies of the same individual heterostructured semiconductor nanowires. Nanotechnology. volum 22 (32).
Academic article
Weigand, Christian Carl; Bergren, M.R.; Ladam, Cecile; Tveit, Johannes; Holmestad, Randi; Vullum, Per Erik; Walmsley, John; Dahl, Øystein; Furtak, T.E.; Collins, R.T.; Grepstad, Jostein; Weman, Helge. (2011) Formation of ZnO Nanosheets Grown by Catalyst-Assisted Pulsed Laser Deposition. Crystal Growth & Design. volum 11 (12).
Academic article
Weigand, Christian Carl; Skåre, Daniel; Ladam, Cecile; Grepstad, Jostein; Weman, Helge. (2011) Effects of substrate annealing on the gold-catalyzed growth of ZnO nanostructures. Nanoscale Research Letters. volum 6.
Academic article
Dasa, Lakshmi Narayana; Zhou, Hailong; Anthonysamy, Fervin Moses; Hoang, Thang Ba; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2010) Growth of heterostructured III-V nanowires by molecular beam epitaxy for photonic applications. Proceedings of SPIE, the International Society for Optical Engineering. volum 7608.
Academic article
Hoang, Thang Ba; Anthonysamy, Fervin Moses; Ahtapodov, Lyubomir; Zhou, Hailong; Dasa, Lakshmi Narayana; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2010) Engineering Parallel and Perpendicular Polarized Photoluminescence from a Single Semiconductor Nanowire by Crystal Phase Control. Nano Letters. volum 10 (8).
Academic article
Van Helvoort, Antonius; Dasa, Lakshmi Narayana; Zhou, Hailong; Grønsberg, Sondre; Patriarche, G; Fimland, Bjørn-Ove; Weman, Helge. (2010) Dark field transmission electron microscopy techniques for structural characterization of nanowire heterostructures. Journal of Physics: Conference Series (JPCS). volum 241.
Academic article
Anthonysamy, Fervin Moses; Hoang, Thang Ba; Dasa Lakshmi Narayana, Dheeraj; Zhou, Hailong; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2009) Micro-photoluminescence study of single GaAsSb/GaAs radial and axial heterostructured core-shell nanowires. IOP Conference Series: Earth and Environmental Science (EES). volum 6:012001.
Academic article
Anthonysamy, Fervin Moses; Hoang, Thang Ba; Dasa, Lakshmi Narayana; Zhou, Hailong; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2009) Micro-photoluminescence study of single GaAsSb/GaAs radial and axial heterostructured core-shell nanowires. Journal of Physics: Conference Series (JPCS).
Academic article
Dasa, Lakshmi Narayana; Patriarche, G.; Zhou, Hailong; Harmand, J.C.; Weman, Helge; Fimland, Bjørn-Ove. (2009) Growth and structural characterization of GaAs/GaAsSb axial heterostructured nanowires. Journal of Crystal Growth. volum 311 (7).
Academic article
Hoang, Thang Ba; Anthonysamy, Fervin Moses; Zhou, Hailong; Dasa, Lakshmi Narayana; Fimland, Bjørn-Ove; Weman, Helge. (2009) Observation of free exciton photoluminescence emission from single wurtzite GaAs nanowires. Applied Physics Letters. volum 94 (13).
Academic article
Hoang, Thang Ba; Zhou, Hailong; Anthonysamy, Fervin Moses; Dasa, Lakshmi Narayana; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2009) Optical properties of single wurtzite GaAs nanowiresand GaAs nanowires with GaAsSb inserts. Materials Research Society Symposium Proceedings. volum 1144.
Academic article
Weigand, Christian Carl; Bergren, Matt; Ladam, Cecile; Vullum, Per Erik; Walmsley, John C; Fagerberg, Ragnar; Furtak, Tom; Collins, Reuben; Grepstad, Jostein; Weman, Helge. (2009) Characterization of ZnO Nanostructures Grown by Pulsed Laser Deposition. Materials Research Society Symposium Proceedings. volum 1174 (V07).
Academic article
Weman, Helge; Palmgren, S.; Karlsson, F.K.; Rudra, A.; Kapon, E.; Dheeraj, D.L.; Fimland, Bjørn-Ove; Harmand, J.C.. (2009) Semiconductor quantum-wires and nano-wires for optoelectronic applications. Journal of materials science. Materials in electronics. volum 20.
Academic article
Zhou, Hailong; Hoang, Thang Ba; Dasa, Lakshmi Narayana; Van Helvoort, Antonius; Liu, L; Harmand, J.C.; Fimland, Bjørn-Ove; Weman, Helge. (2009) Wurtzite GaAs/AlGaAs core-shell nanowires grown by molecular beam epitaxy. Nanotechnology. volum 20 (41).
Academic article
Dasa, Lakshmi Narayana; Patriarche, G.; Zhou, Hailong; Hoang, Thang Ba; Anthonysamy, Fervin Moses; Grønsberg, Sondre; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2008) Growth and characterization of GaAs nanowires with defect-free zinc blende GaAsSb inserts. Nano Letters. volum 8 (12).
Academic article
Dasa, Lakshmi Narayana; Patriarche, G; Largeau, L; Zhou, Hailong; Van Helvoort, Antonius; Glas, F; Harmand, JC; Fimland, Bjørn-Ove; Weman, Helge. (2008) Zinc blende GaAsSb nanowires grown by molecular beam epitaxy. Nanotechnology. volum 19.
Academic article
Karlsson, F.K.; Weman, Helge; Leifer, K.; Rudra, A.; Kapon, E.; Lyo, S.K.. (2007) Strongly reduced exciton transfer between parallel quantum wires. Applied Physics Letters. volum 90 (10).
Academic article
Palmgren, S.; Weman, Helge; Schoenberg, A.; Karlsson, F.K.; Dupertuis, M.-A.; Leifer, K.; Rudra, A.; Kapon, E.. (2006) Polarization-resolved optical absorption in single V-groove quantum wires. Applied Physics Letters. volum 89 (19).
Academic article
Reichardt, H.; Leifer, K.; Pelucchi, E.; Karlsson, F.K.; Weman, Helge; Rudra, A.; Kapon, E.. (2006) Influence of long-range substrate roughness on disorder in V-groove quantum wire structures. Journal of Applied Physics. volum 100 (12).
Academic article
Karlsson, F.K.; Dupertuis, M.-A.; Weman, Helge; Kapon, E.. (2005) The fractional-dimensional excitonic absorption theory applied to real V-groove quantum wires. AIP Conference Proceedings. volum 772.
Academic article
Karlsson, F.K.; Weman, Helge; Leifer, K.; Rudra, A.; Kapon, E.. (2005) Carrier tunneling between parallel GaAs/AlGaAs quantum wires. AIP Conference Proceedings. volum 772.
Academic article

Part of book/report

Dasa, Lakshmi Narayana; Zhou, Hailong; Anthonysamy, Fervin Moses; Hoang, Thang Ba; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2010) Heterostructured III-V Nanowires with Mixed Crystal Phases Grown by Au-assisted Molecular Beam Epitaxy. Nanowires.
Academic chapter/article/Conference paper
Weigand, Christian Carl; Bergren, Matt; Valset, Kjetil; Carey, David; Fagerberg, Ragnar; Ladam, Cecile; Grepstad, Jostein; Weman, Helge; Furtak, Tom; Collins, Reuben. (2008) Characterization of ZnO Layers Grown by Pulsed Laser Deposition for Hybrid Inorganic/Organic Solar Cells. The Proceedings of the 23rd European Photovoltaic Solar Energy Conference.
Academic chapter/article/Conference paper

Teaching

Courses

Media

2022

Poster

Li, Yang; Nilsen, Tron Arne; Liudi Mulyo, Andreas; Mukherjee, Anjan; Ren, Dingding; Weman, Helge; Fimland, Bjørn Ove Myking. (2022) Selective area MBE growth of GaN nanowires on graphene/sapphire using a hole-patterned SiO2 mask. The 1st TNNN Conference & Norwegian Nano Symposium 2022 . NTNU NANO; Trondheim. 2022-11-30 - 2022-12-02.
Poster

Li, Yang; Nilsen, Tron Arne; Liudi Mulyo, Andreas; Ren, Dingding; Weman, Helge; Fimland, Bjørn Ove Myking. (2022) Selective area epitaxy of GaN nanowires on single-layer graphene substrates by molecular beam epitaxy. Int. Workshop on Nitride Semiconductors ; Berlin. 2022-10-09.
Poster

Li, Yang; Nilsen, Tron Arne; Mukherjee, Anjan; Ren, Dingding; Weman, Helge; Fimland, Bjørn Ove Myking. (2022) Selective area epitaxy of GaN nanowires on graphene substrates by plasma assisted molecular beam epitaxy. The 22nd International Conference on Molecular Beam Epitaxy . University of Sheffield and Institute of Physics, UK; Sheffield. 2022-09-04 - 2022-09-09.
Academic lecture

Mukherjee, Anjan; Ren, Dingding; Vullum, Per Erik; Huh, Junghwan; Fimland, Bjørn Ove Myking; Weman, Helge. (2022) Axial GaAs/AlGaAs Nanowire Solar Cell on Si with Ultra-High Power-per-Weight Ratio. III-V Semiconductors for Energy Conversion Technologies . MRS Spring Meeting; Honolulu (remote). 2022-05-23 - 2022-05-27.
Poster

Ren, Dingding; Chen, Z.; Borisov, B.; Vullum, Per Erik; Nilsen, Julie Stene; Ahtapodov, Lyubomir; Li, Yang; Van Helvoort, Antonius; Fimland, Bjørn Ove Myking; Liu, Z.; Weman, Helge. (2022) Growth and Characterization of InGaN/GaN Nanowires on Graphene Glass. Int. Workshop on Nitride Semiconductors ; Berlin. 2022-10-09.
Poster

Ren, Dingding; Nilsen, Tron Arne; Nilsen, Julie Stene; Ahtapodov, Lyubomir; Mukherjee, Anjan; Li, Yang; Van Helvoort, Antonius; Weman, Helge; Fimland, Bjørn Ove Myking. (2022) MBE Growth of GaAsSb/GaAs Multiple Quantum Disk Nanowires on Few-layer Graphene for Photonic Applications. 22nd International Conference on Molecular Beam Epitaxy . University of Sheffield and Institute of Physics, UK; Sheffield, UK. 2022-09-04 - 2022-09-09.
Academic lecture

Weman, Helge. (2022) III-V nanowire/graphene hybrid structures for applications in solar cells and UV LEDs. Invited talk at Int. symp. on Semiconductor Materials and Devices . Semiconductor Society of India (SSI); Bhubaneswar (remote). 2022-12-16 - 2022-12-18.
Academic lecture

Weman, Helge. (2022) III-V nanowire/graphene hybrid structures for applications in solar cells and UV LEDs. Invited talk at EPFL . EPFL-Lausanne; Lausanne. 2022-06-13 - 2022-06-13.
Popular scientific lecture

Weman, Helge. (2022) Litt bakgrunn og historikk til opprinnelsen av CrayoNano. Invitert til styremøte NFR Muliggjørende teknologier . Styre NFR Muliggjørende teknologier; Oslo (remote). 2022-04-06 - 2022-04-06.

2021

Poster

LI, Yang; Nilsen, Tron Arne; Mukherjee, Anjan; Liudi Mulyo, Andreas; Fimland, Bjørn-Ove; Weman, Helge. (2021) Selective area growth of GaN nanowires on sapphire and graphene substrates by molecular beam epitaxy. 21st International Conference on Molecular Beam Epitaxy . CINVESTAV; Puerto Vallarta and Virtual. 2021-09-06 - 2021-09-09.
Interview

Mukherjee, Anjan; Fimland, Bjørn-Ove; Weman, Helge. (2021) Gallium arsenide nanowire solar cell with 7.7% efficiency. pv-magazine.com [Internett]. 2021-11-09.
Interview

Mukherjee, Anjan; Fimland, Bjørn-Ove; Weman, Helge. (2021) New ultra-high material efficient, low-cost solar cells — using nanowires. Eurekalert.org [Internett]. 2021-11-05.
Interview

Mukherjee, Anjan; Fimland, Bjørn-Ove; Weman, Helge. (2021) New ultra-high material efficient, low-cost solar cells — using nanowires. https://norwegianscitechnews.com/ [Internett]. 2021-11-05.
Academic lecture

Weman, Helge. (2021) AlGaN nanowire UV LEDs using graphene as a transparent conducting substrate. Invited talk "The XXIst International Workshop on the Physics of Semiconductor Devices (IWPSD 2021)" . Indian Institute of Technology Delhi; New Delhi and on-line. 2021-12-14 - 2021-12-17.
Academic lecture

Weman, Helge. (2021) AlGaN nanowire UV LEDs using graphene as a transparent conducting substrate. Invited talk "The 7th International Forum on Wide Bandgap Semiconductors " . China Solid State Lighting Alliance (CSA); Shenzhen. 2021-12-06 - 2021-12-08.
Academic lecture

Weman, Helge. (2021) AlGaN nanowire UV LEDs using graphene as substrate and transparent electrode. Invited talk "Quantum Science and Condensed Matter Seminar" . EPFL; Lausanne. 2021-06-25 - 2021-06-25.
Academic lecture

Weman, Helge. (2021) AlGaN nanowire UV LEDs using graphene as substrate and transparent electrode. Invited talk "Epitaxy on 2D materials for layer release and their applications" . MIT; Virtual. 2021-06-28 - 2021-06-30.
Popular scientific lecture

Weman, Helge. (2021) Litt bakgrunn og historikk til opprinnelsen av CrayoNano. Feiring CrayoNano betaling av patenter fra NTNU . IE fakultetet NTNU; Trondheim. 2021-12-22 - 2021-12-22.
Popular scientific lecture

Weman, Helge. (2021) Nanowire/graphene UVC LEDs. NTNU Nanokveld . Timini NTNU; Trondheim. 2021-04-19 - 2021-04-19.

2020

Academic lecture

Weman, Helge. (2020) AlGaN nanowire UV LEDs using graphene as substrate and transparent electrode. Invited talk 5th International Conference on Emerging Electronics . Indian Institute of Technology Delhi; New Delhi and on-line. 2020-11-26 - 2020-11-28.

2019

Interview

Høiaas, Ida Marie; Weman, Helge; Fimland, Bjørn-Ove. (2019) New nanomaterial to replace mercury. Norwegian SciTech News [Internett]. 2019-04-25.
Interview

Høiaas, Ida Marie; Weman, Helge; Fimland, Bjørn-Ove. (2019) Ny og ufarlig elektronisk komponent kan erstatte kvikksølv. Teknisk Ukebald [Fagblad]. 2019-05-28.
Interview

Høiaas, Ida Marie; Weman, Helge; Fimland, Bjørn-Ove. (2019) Utviklet nanomateriale som kan erstatte kvikksølv. Gemini.no [Internett]. 2019-05-27.
Academic lecture

Liudi Mulyo, Andreas; Kim, Dong Chul; Høiaas, Ida Marie; Ahtapodov, Lyubomir; Weman, Helge; Kishino, Katsumi; Fimland, Bjørn-Ove. (2019) Utilization of Graphene as Substrate and Bottom Electrode for High-Density and Vertically-Aligned GaN/AlGaN Nanocolumns in Light-Emitting Diodes in the UV-A. 10th annual workshop on Norwegian PhD Network on Nanotechnology for Microsystems ; Tromsø. 2019-06-17 - 2019-06-19.
Poster

Liudi Mulyo, Andreas; Rajpalke, Mohana Krishnappa; Vullum, Per Erik; Weman, Helge; Kishino, Katsumi; Fimland, Bjørn-Ove. (2019) The Influence of AlN Buffer Layer on the Growth of Self-Assembled GaN Nanocolumns on Graphene. The 13th International Conferences on Nitride Semiconductors . Material Research Society; Bellevue, Washington (Seattle). 2019-07-07 - 2019-07-12.
Poster

Liudi Mulyo, Andreas; Rajpalke, Mohana; Vullum, Per Erik; Weman, Helge; Kishino, Katsumi; Fimland, Bjørn-Ove. (2019) The influence of AlN buffer layer on the growth of self-assembled GaN nanocolumns on graphene. Nanowire Week 2019 . Scuola Normale Superiore and Istituto Nanoscienze-CNR; Pisa. 2019-09-23 - 2019-09-27.
Academic lecture

Liudi Mulyo, Andreas; Rajpalke, Mohana; Vullum, Per Erik; Weman, Helge; Kishino, Katsumi; Fimland, Bjørn-Ove. (2019) The influence of AlN buffer layer on the growth of self-assembled GaN nanocolumns on graphene. Nanowire week ; Pisa. 2019-09-23 - 2019-09-27.
Poster

Mosberg, Aleksander Buseth; Myklebost, Steinar; Ren, Dingding; Weman, Helge; Fimland, Bjørn-Ove; Van Helvoort, Antonius. (2019) Characterizing nanowire arrays by computer vision based on SEM images. 16th European microbeam analysis society meeting . EMAS; Trondheim. 2019-05-19 - 2019-05-23.
Academic lecture

Mukherjee, Anjan; Mosberg, Aleksander Buseth; Ren, Dingding; Li, Yang; Ahtapodov, Lyubomir; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2019) Radial Junction GaAs Nanowire Solar Cells: Towards Efficient Performance. 10th Annual NanoNetwork conference . NanoNetwork; Tromsø. 2019-06-17 - 2019-06-19.
Academic lecture

Nilsen, Julie Stene; Huh, Junghwan; Munshi, A Mazid; Dheeraj, Dasa; Weman, Helge; Fimland, Bjørn-Ove; Van Helvoort, Antonius. (2019) Contacting nanostrusctures: detailed characterisation of the Au/Ge/GaAs nanowire interface. Microscopy of Semiconducting Materials (MSM-XXI) . IoP; Cambridge. 2019-04-09 - 2019-04-12.
Academic lecture

Ren, Dingding; Ahtapodov, Lyubomir; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2019) Crystal phase engineering in GaAsSb/GaAs nanowires grown by MBE. 1st International Workshop on Crystal-Phase Structures in Nanowires . DTU; Copenhagen. 2019-04-04 - 2019-04-05.
Poster

Ren, Dingding; Chen, Z; Nilsen, Julie Stene; Ahtapodov, Lyubomir; Borisov, B.; Mukherjee, Anjan; Li, Y; Liu, Z; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2019) Epitaxially Grown InGaN/GaN Nanowires on Graphene Glass. 13th International Conference on Nitride Semiconductors 2019 (ICNS-13) ; Bellevue. 2019-07-07 - 2019-07-12.
Academic lecture

Weman, Helge. (2019) AlGaN nanowire UV LED using graphene as substrate and transparent bottom electrode. Invited talk at Neel Institute . Neel Institute; Grenoble. 2019-10-17 - 2019-10-17.
Academic lecture

Weman, Helge. (2019) AlGaN nanowire UV LED using graphene as substrate and transparent bottom electrode. Invited talk Beijing Graphene Institute . Beijing Graphene Insiitute; Beijing. 2019-11-28.
Academic lecture

Weman, Helge. (2019) AlGaN nanowire UV LED using graphene as substrate and transparent bottom electrode. Invited talk 16th China International Forum on Solid State Lighting . China Solid State Lighting Alliance; Shenzhen. 2019-11-25 - 2019-11-27.
Popular scientific lecture

Weman, Helge. (2019) Nanowire UV LEDs using graphene as substrate and transparent electrode. Grey Goo Symposium . Nanoteknologistudiet NTNU; Trondheim. 2019-02-14 - 2019-02-14.
Interview

Weman, Helge. (2019) Scientists create ultraviolet light on a graphene surface. Nanowerk [Internett]. 2019-05-23.
Interview

Weman, Helge. (2019) UV LEDs on graphene: Cheaper and ten times more efficient. eeNews [Internett]. 2019-02-13.
Interview

Weman, Helge. (2019) Un nuevo nanomaterial reemplaza al mercurio para producir luz UVC. Europapress.es [Internett]. 2019-04-26.
Lecture

Weman, Helge. (2019) Using graphene as epitaxial substrate and transparent electrode for semiconductor devices. Invited talk at Graphene 2019 . Phantoms; Rome. 2019-06-25 - 2019-06-28.

2018

Poster

Ahtapodov, Lyubomir; Munshi, A Mazid; Fimland, Bjørn-Ove; Van Helvoort, Antonius; Weman, Helge. (2018) Optical determination of the GaAs zinc blende/wurtzite band offsets. Nanowire Week 2018 ; Hamilton. 2018-06-11 - 2018-06-15.
Poster

Høiaas, Ida Marie; Liudi Mulyo, Andreas; Vullum, Per Erik; Ahtapodov, Lyubomir; KIM, DONG CHUL; Fimland, Bjørn-Ove; Kishino, Katsumi; Weman, Helge. (2018) GaN/AlGaN nanocolumn UV LED using graphene as substrate and transparent electrode. Int. Workshop on Nitride Semiconductors ; Kanazawa. 2018-11-11 - 2018-11-16.
Academic lecture

Høiaas, Ida Marie; Liudi Mulyo, Andreas; Vullum, Per Erik; Ahtapodov, Lyubomir; KIM, DONG CHUL; Fimland, Bjørn-Ove; Kishino, Katsumi; Weman, Helge. (2018) Using graphene as substrate and transparent electrode in an GaN/AlGaN nanocolumn flip-chip UV LED. Nanowire Week ; Hamilton. 2018-06-11 - 2018-06-15.
Poster

Liudi Mulyo, Andreas; Rajpalke, Mohana Krishnappa; Kuroe, Haruhiko; Vullum, Per Erik; Weman, Helge; Fimland, Bjørn-Ove; Kishino, Katsumi. (2018) Growth and characterization of GaN nanocolumns grown on graphene using a thin AlN buffer layer. International Workshop on Nitride Semiconductors (IWN2018) ; Kanazawa. 2018-11-11 - 2018-11-16.
Poster

Mukherjee, Anjan; Ren, Dingding; Islam, M. A.; Mosberg, Aleksander Buseth; Li, Yang; Ahtapodov, Lyubomir; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2018) Monitoring Axial and Radial Junction GaAs Nanowire Solar Cells Through a New Approach: Towards Efficient Performance. NTNU Nano Symposium . NTNU NanoLab; Trondheim. 2018-11-28 - 2018-11-29.
Academic lecture

Mukherjee, Anjan; Shin, Dong Hoon; Munshi, Abdul Mazid; Dheeraj, D.L.; Nam, Jung Tae; Kim, Keun Sook; Fimland, Bjørn-Ove; Weman, Helge; Lee, Sang Wook; KIM, DONG CHUL. (2018) Bias-dependent scanning photocurrent microscopy on embedded single GaAs nanowire/graphene hybrid device. Nanowire Week ; Hamilton. 2018-06-11 - 2018-06-15.
Academic lecture

Mukherjee, Anjan; Shin, Dong Hoon; Munshi, Abdul Mazid; Dheeraj, Dasa; Nam, Jung Tae; Kim, Keun Sook; Fimland, Bjørn-Ove; Weman, Helge; Lee, Sang Wook; Kim, Dong-Chul. (2018) Bias-dependent Scanning Photocurrent Microscopy on a Single GaAs Nanowire Graphene Hybrid Device. NTNU Nano Symposium ; Trondheim. 2018-11-28 - 2018-11-29.
Poster

Munshi, Abdul Mazid; KIM, DONG CHUL; Heimdal, Carl Philip J; Heilmann, Martin; Christiansen, Silke; Vullum, Per Erik; Van Helvoort, Antonius; Weman, Helge. (2018) Positioned-controlled growth of AlGaN nanopyramid arrays on graphene by metal-organic vapor phase epitaxy. Int. Workshop on Nitride Semiconductors ; Kanazawa. 2018-11-11 - 2018-11-16.
Poster

Nilsen, Julie Stene; Ånes, Håkon Wiik; Andersen, Ingrid Marie; Ren, Dingding; Weman, Helge; Fimland, Bjørn-Ove; Van Helvoort, Antonius. (2018) Large Area Crystal Phase Mapping by Scanning Electron Diffraction and Machine Learning Data Analysis. Scandem 2018 . CEN-DTU/Scandem; Copenhagen. 2018-06-25 - 2018-06-28.
Poster

Nylund, Inger-Emma; Ren, Dingding; Weman, Helge; Fimland, Bjørn-Ove; Van Helvoort, Antonius. (2018) Electron microscopy characterization of GaN Nanowires grown on graphene. CSI2018 . IFY&IMA; Trondheim. 2018-06-19 - 2018-06-21.
Academic lecture

Ren, Dingding; Ahtapodov, Lyubomir; Nilsen, Julie Stene; Yang, J.; Gustafsson, A.; Huh, Junghwan; Kim, Dong-Chul; Conibeer, G; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2018) Single Nanowire Laser with GaAsSb-based Multiple-Superlatticed Gain Structure. 60th electronic materials conference at UCSB . UCSB; Santa Barbara. 2018-06-27 - 2018-06-29.
Academic lecture

Ren, Dingding; Ahtapodov, Lyubomir; Nilsen, Julie Stene; Yang, J.; Huh, Junghwan; Kim, Dong-Chul; Conibeer, G; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2018) Single Nanowire Laser with GaAsSb-based Multiple-Superlatticed Gain Structure. Compound Semiconductor week 2018 . MIT; Boston. 2018-05-29 - 2018-06-01.
Lecture

Weman, Helge. (2018) AlGaN nanowire UV LED using graphene as substrate and transparent electrode. Invited talk at Solid State Lighting-China 2018 ; Shenzhen. 2018-10-23 - 2018-10-25.
Academic lecture

Weman, Helge. (2018) Growth and Fabrication of III-V Nanowire/Graphene Hybrid Structures and Devices. Invited talk at NTT Res. Lab, Atsugi, Japan . NTT; Morinosato. 2018-09-14 - 2018-09-14.
Academic lecture

Weman, Helge. (2018) Growth and fabrication of III-V nanowire/graphene hybrid structures and devices. Invited talk at Nanowire Week ; Hamilton. 2018-06-11 - 2018-06-15.
Academic lecture

Weman, Helge. (2018) III-V semiconductor nanowire/graphene hybrid structures and devices. Invited talk at NTNU NanoLab Symposium 2018 . NTNU NanoLab; Trondheim. 2018-11-28 - 2018-11-29.
Academic lecture

Weman, Helge. (2018) III-V semiconductor nanowire/graphene hybrid structures and devices. Invited talk at Technical University of Berlin . TU Berlin; Berlin. 2018-01-22 - 2018-01-22.
Interview

Weman, Helge. (2018) Tenk Stort- Tenk Nano. Podcast [Internett]. 2018-12-06.
Academic lecture

Weman, Helge. (2018) Using graphene as an epitaxial substrate and transparent electrode for GaN/AlGaN UV LEDs. Invited talk at Solid State Devices and Materials-Japan ; Tokyo. 2018-09-11 - 2018-09-13.
Academic lecture

Weman, Helge. (2018) Using graphene as epitaxial substrate and transparent electrode for AlGaN UV LEDs. Invited talk at ImagineNano 2018 . Phantoms Foundation; Bilbao. 2018-03-13 - 2018-03-15.
Academic lecture

Weman, Helge. (2018) Using graphene as epitaxial substrate and transparent electrode for semiconductor devices. Invited talk at Beijing Graphene Forum and BGI Inauguration . Beijing Graphene Institute (BGI); Beijing. 2018-10-25 - 2019-08-26.
Interview

Weman, Helge. (2018) Vil revolusjnere UV LED markedet. NTNU Discovery årsrapport 2017 [Tidsskrift]. 2018-01-01.
Interview

Weman, Helge; Fimland, Bjørn-Ove. (2018) Building Miniature Lasers with Nanowires. Science and technology research news [Internett]. 2018-08-24.
Interview

Weman, Helge; Fimland, Bjørn-Ove. (2018) Building minature lasers with nanowires. Gemini.no [Internett]. 2018-08-23.
Interview

Weman, Helge; Fimland, Bjørn-Ove. (2018) Building miniature lasers using nanowire. Nanowerk.com [Internett]. 2018-08-29.
Interview

Weman, Helge; Fimland, Bjørn-Ove. (2018) Lager miniatyrlasere i nanotråder. Gemini.no [Internett]. 2018-06-29.

2017

Lecture

Fauske, vidar T.; Huh, Junghwan; Divitini, Giorgio; Munshi, A Mazid; Dheeraj, D.L.; Ducati, C; Weman, Helge; Fimland, Bjørn-Ove; Van Helvoort, Antonius. (2017) In-situ studying the heat‐induced replacement of GaAs by Au. In-situ TEM sample-management solution workshop . LOT FRance/DENS Solutions; Grenoble. 2017-03-16 - 2017-03-16.
Academic lecture

Høiaas, Ida Marie; Liudi Mulyo, Andreas; KIM, DONG CHUL; Fimland, Bjørn-Ove; Kishino, Katsumi; Weman, Helge. (2017) AlGaN/GaN nanowire flip-chip UV LED using graphene as substrate and transparent electrode. Nano@NTNU . Nanolab NTNU og Nano Network; Trondheim. 2017-12-06 - 2017-12-07.
Poster

Høiaas, Ida Marie; Liudi Mulyo, Andreas; KIM, DONG CHUL; Fimland, Bjørn-Ove; Kishino, Katsumi; Weman, Helge. (2017) Graphene as growth substrate and transparent electrode for flip-chip GaN/AlGaN nanocolumn UV-LEDs. Carbonhagen 2017 . DTU, Danmark; Copenhagen. 2017-08-16.
Lecture

Liudi Mulyo, Andreas; Fimland, Bjørn-Ove; Weman, Helge; Kishino, Katsumi. (2017) Epitaxial Growth of Vertical n-type GaN/AlGaN Nanocolumns on Graphene/Silica Glass. The 12th International Conferences on Nitride Semiconductors ; Strasbourg. 2017-07-24 - 2017-07-28.
Lecture

Liudi Mulyo, Andreas; Høiaas, Ida Marie; KIM, DONG CHUL; Fimland, Bjørn-Ove; Weman, Helge; Kishino, Katsumi. (2017) AlGaN/GaN Nanocolumn Flip-Chip UV LEDs Grown on Graphene/Silica Glass. The 11th International Symposium on Semiconductor Light Emitting Devices ; Banff. 2017-10-08 - 2017-10-12.
Poster

Liudi Mulyo, Andreas; Høiaas, Ida Marie; Rajpalke, Mohana Krishnappa; Fimland, Bjørn-Ove; Weman, Helge; Kishino, Katsumi. (2017) Graphene as a substrate and bottom electrode for high density and vertically aligned GaN nanocolumns. Nano@NTNU Symposium . Nanolab NTNU; Trondheim. 2017-12-06 - 2017-12-07.
Lecture

Liudi Mulyo, Andreas; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge; Kishino, Katsumi. (2017) Epitaxy Feasibility of n-type GaN/AlGaN Nanocolumns on Silica Glass. Compound Semiconductor Week 2017 . PDI Berlin; Berlin. 2017-05-14 - 2017-05-18.
Poster

Mosberg, Aleksander Buseth; Myklebost, S; Ren, Dingding; Weman, Helge; Fimland, Bjørn-Ove; Van Helvoort, Antonius. (2017) Evaluating focused ion beam patterning for nanowire growth using computer vision. EMAG/MMC . IoP/RMS; Manchester. 2017-07-03 - 2017-07-06.
Poster

Mosberg, Aleksander Buseth; Myklebost, S; Ren, Dingding; Weman, Helge; Fimland, Bjørn-Ove; Van Helvoort, Antonius. (2017) Exploring focused ion beam substrate patterning for nanowire growth. Nanowire Week . Lund University; Lund. 2017-05-29 - 2017-06-02.
Poster

Mukherjee, Anjan; KIM, DONG CHUL; Munshi, Mazid; Dasa, Dheeraj; Fimland, Bjørn-Ove; Weman, Helge. (2017) Fabrication of Single GaAs Nanowire/Graphene Hybrid Devices for Optoelectronic Applications. Nordic Nanolab User Meeting (NNUM) 2017 ; Trondheim. 2017-05-09 - 2017-05-10.
Poster

Mukherjee, Anjan; KIM, DONG CHUL; Yun, Hoyeol; Seo, Miri; Kim, Keun Sook; Lee, Sang Wook; Munshi, Abdul Mazid; Dheeraj, D.L.; Fimland, Bjørn-Ove; Weman, Helge. (2017) Embedded single GaAs nanowire/graphene hybrid devices fabricated by a position- controlled micro transfer and imprinting technique. Nanowire week . Lund University; Lund. 2017-05-29 - 2017-06-02.
Academic lecture

Mukherjee, Anjan; KIM, DONG CHUL; Yun, Hoyeol; Seo, Miri; Nam, Jung Tae; Kim, Keun Soo; Munshi, Mazid; Dasa, Dheeraj; Fimland, Bjørn-Ove; Weman, Helge. (2017) High-Quality Single GaAs Nanowire/Graphene Junctions Fabricated by using an Imprinting Technique for Embedded Nanowire Configurations. 8th Annual Workshop of the Norwegian PhD Network on Nanotechnology for Microsystems - 2017 ; Bergen. 2017-06-12 - 2017-06-14.
Poster

Mukherjee, Anjan; KIM, DONG CHUL; Yun, Hoyeol; Seo, Miri; Nam, Jungtae; Kim, Keun Sook; Lee, Sang Wook; Munshi, Mazid; Dasa Lakshmi Narayana, Dheeraj; Fimland, Bjørn-Ove; Weman, Helge. (2017) An Imprinting Technique to Fabricate Embedded Single GaAs Nanowire/Graphene Hybrid Devices. Carbonhagen 2017 . DTU, Danmark; Copenhagen. 2017-08-16 - 2017-08-17.
Poster

Mukherjee, Anjan; KIM, DONG CHUL; Yun, Hoyeol; Seo, Miri; Nam, Jungtae; Kim, Keun Sook; Lee, Sang Wook; Munshi, Mazid; Dasa Lakshmi Narayana, Dheeraj; Fimland, Bjørn-Ove; Weman, Helge. (2017) Single GaAs nanowire/graphene hybrid devices fabricated by a position controlled micro transfer and imprinting technique for embedded structures. MRS Spring meeting 2017 . MRS; Phoenix. 2017-04-17 - 2017-04-21.
Poster

Ren, Dingding; Ahtapodov, Lyubomir; Nilsen, Julie Stene; Yang, J.; Gustafsson, A; Huh, Junghwan; Kim, D.C.; Conibeer, G; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2017) High-Q factor, single-mode, room-temperature lasing from GaAsSb/GaAs nanowire superlattices. Nanowire Week . Lund University; Lund. 2017-05-29 - 2017-06-02.
Academic lecture

Ren, Dingding; Ahtapodov, Lyubomir; Nilsen, Julie Stene; Yang, J.; Gustafsson, Anders; Huh, Junghwan; Conibeer, G; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2017) Ternary GaAsSb Nanowire for Optoelectronic Applications. Nano@NTNU symposium 2017 . NTNU NanoLab; Trondheim. 2017-12-06 - 2017-12-07.
Lecture

Van Helvoort, Antonius; Garmannslund, Andreas; Bogen, J; Nilsen, Julie Stene; Fauske, vidar T.; Ren, Dingding; Weman, Helge; Fimland, Bjørn-Ove. (2017) Improved compositional mapping of heterostructured nanowire (by STEM-EDX). Nanowire Week . Lund University; Lund. 2017-05-29 - 2017-06-02.
Lecture

Weman, Helge. (2017) AlGaN nanostructures on graphene: A new disruptive technology for UV LEDs. LED Taiwan 2017 . LED Taiwan; Taipei. 2017-04-12 - 2017-04-12.
Lecture

Weman, Helge. (2017) AlGaN nanowire flip-chip UV LEDs grown on graphene/glass. SSL China 2017 . SSL China; Beijing. 2017-11-01 - 2017-11-03.
Popular scientific lecture

Weman, Helge. (2017) Changing the UV LED industry and beyond. TTO vårslæpp . NTNU TTO; Trondheim. 2017-06-07 - 2017-06-07.
Interview

Weman, Helge. (2017) En reaktor blir installert i Trondheim. Den gror halvleder nanotråder til UV LED som dreper bakterier og desinfiserer. Teknisk Ukeblad [Tidsskrift]. 2017-08-27.
Academic lecture

Weman, Helge. (2017) Epitaxial growth of heterostructured III-V semiconductor nanowires on graphene. Invited talk KIST, Korea . KIST; Jeonbuk. 2017-04-10 - 2017-04-10.
Academic lecture

Weman, Helge. (2017) Epitaxial growth of heterostructured III-V semiconductor nanowires on graphene. Invited talk Erik Bakkers group, Eindhoven TU . Eindhoven TU; Eindhoven. 2017-05-02 - 2017-05-02.
Academic lecture

Weman, Helge. (2017) Epitaxial growth of heterostructured III-V semiconductor nanowires on graphene. Invited talk at South China University . South China University; Changsha. 2017-04-19 - 2017-04-19.
Academic lecture

Weman, Helge. (2017) Epitaxial growth of semiconductor nanostructures on graphene. Carbonhagen 2017 . DTU, Danmark; Copenhagen. 2017-08-16 - 2017-08-17.
Interview

Weman, Helge. (2017) Gründerselskapet CrayoNano AS vil nå et etablere et pilotanlegg for utvikling av en ny type UV-LED i Trondheim. Gemini [Internett]. 2017-06-15.
Academic lecture

Weman, Helge. (2017) III-V semiconductor nanowire/graphene hybrid structures and devices. Fredagkollokvie fysikk . NTNU; Trondheim. 2017-10-27 - 2017-10-27.
Academic lecture

Weman, Helge. (2017) III-V semiconductor nanowire/graphene hybrid structures and devices. Invited talk in Prof. Zetian Mi's group Uni. Michigan . Uni. Michigan; Ann Arbor. 2017-10-16 - 2017-10-16.
Academic lecture

Weman, Helge. (2017) III-V semiconductor nanowire/graphene hybrid structures and devices. Invited talk in prof. Zhongfan Liu-s group . Beijing Graphene Institute; Beijing. 2017-10-31 - 2017-10-31.
Academic lecture

Weman, Helge. (2017) III-V semiconductor nanowire/graphene structures and photonic devices. Invited talk at Int. workshop on Physics of Semiconductor Devices ; New Delhi. 2017-12-11 - 2017-12-15.
Academic lecture

Weman, Helge. (2017) III-V semiconductor nanowire/graphene structures and photonic devices. Invited talk at KTH . Albanova, KTH; Stockholm. 2017-10-25 - 2017-10-25.
Interview

Weman, Helge. (2017) Norway pioneers new UV LEDs. Gemini [Internett]. 2017-08-03.
Interview

Weman, Helge. (2017) Sluppen klar for industrieventyr. Adressa [Avis]. 2017-06-06.
Interview

Weman, Helge. (2017) Teknologiselskap henter 50 millioner og ny ledelse. Dagens Næringsliv [Avis]. 2017-06-15.
Interview

Weman, Helge. (2017) UV LED av nanotråder på grafén. Elektronikknet [Fagblad]. 2017-06-28.

2016

Poster

Høiaas, Ida Marie; KIM, DONG CHUL; Weman, Helge. (2016) Aluminum-induced crystallization of Si on graphene for optoelectronic devices. Carbonhagen 2016 . København Universitet og DTU; København. 2016-08-17 - 2016-08-18.
Poster

Høiaas, Ida Marie; KIM, DONG CHUL; Weman, Helge. (2016) Large-grained Si(111) crystalline thin film on graphene by aluminum-induced crystallization. Graphene 2016 ; Genoa. 2016-04-18 - 2016-04-22.
Poster

KIM, DONG CHUL; Jungtae, Nam; Hoyeol, Yun; Seungjin, Nam; Jun Yeong, Hwang; Sang Wook, Lee; Weman, Helge; Keun Sook, Kim. (2016) Chemical vapor deposition of graphene and its physisorption strain on Pt substrates. Carbonhagen 2016 ; Copenhagen. 2016-08-17 - 2016-08-18.
Poster

KIM, DONG CHUL; Jungtae, Nam; Hoyeol, Yun; Seungjin, Nam; Jun Yeong, Hwang; Sang Wook, Lee; Weman, Helge; Keun Sook, Kim. (2016) Investigation of graphene growth on platinium by chemical vapor deposition. Graphene2016 ; Genoa. 2016-04-18 - 2016-04-22.
Academic lecture

Liudi Mulyo, Andreas; Konno, Yuta; Fimland, Bjørn-Ove; Weman, Helge; Kishino, Katsumi. (2016) Growth of Self-Organized Vertical GaN Nanocolumns Utilizing AlN as Nucleation Sites on Single Layer Graphene/Silica Glass by Molecular Beam Epitaxy. International Workshop on Nitride Semiconductors (IWN 2016) ; Orlando. 2016-10-02 - 2016-10-07.
Lecture

Liudi Mulyo, Andreas; Konno, Yuta; Fimland, Bjørn-Ove; Weman, Helge; Kishino, Katsumi. (2016) Self-Organized Vertical GaN Nanocolumns Grown on Silica Glass by RF-Molecular Beam Epitaxy. 19th International Conference on Molecular Beam Epitaxy ; Montpellier. 2016-09-04 - 2016-09-09.
Lecture

Liudi Mulyo, Andreas; Konno, Yuta; Weman, Helge; Kishino, Katsumi. (2016) Self-Organized GaN Nanocolumns Grown on Silica Glass by RF-Molecular Beam Epitaxy. Japanese Physical Society Spring Meeting . Japanese Physical Society; Tokyo. 2016-03-19 - 2016-03-22.
Poster

Mukherjee, Anjan; KIM, DONG CHUL; Yun, Hoyeol; Munshi, Mazid; Dasa, Dheeraj; Fimland, Bjørn-Ove; Weman, Helge. (2016) Comparison Study of Bottom- & Top- Graphene/Single GaAs Nanowire Contacts for Optoelectronic Applications. The Nano NTNU Symposium 2016 ; Trondheim. 2016-11-17 - 2016-11-18.
Academic lecture

Nilsen, Julie Stene; Huh, Junghwan; Munshi, A Mazid; Dheeraj, D.L.; Fimland, Bjørn-Ove; Weman, Helge; Van Helvoort, Antonius. (2016) Pd/Ge/Au contacts on GaAs Nanowires. Nano@NTNU workshop . NTNU NanoLab; Trondheim. 2016-11-17 - 2016-11-18.
Lecture

Nilsen, Julie Stene; Huh, Junghwan; Munshi, A; Dheeraj, D.L.; Fimland, Bjørn-Ove; Weman, Helge; Van Helvoort, Antonius. (2016) Characterization of Pd/Ge/Au contacts on GaAs Nanowires. 67th Scandem Meeting . Scandem; Trondheim. 2016-06-07 - 2016-06-10.
Lecture

Nilsen, Julie Stene; Huh, Junghwan; Munshi, A; Dheeraj, D.L.; Fimland, Bjørn-Ove; Weman, Helge; Van Helvoort, Antonius. (2016) Transmission electron microscopy study of Pd/Ge/Au contacts to GaAs nanowires. 7th NanoNetwork workshop . NanoNetwork; Trondheim. 2016-06-13 - 2016-06-15.
Poster

Nilsen, Julie Stene; Mosberg, Aleksander Buseth; Garmannslund, Andreas; Reinertsen, Johannes F; Munshi, A Mazid; Dheeraj, D.L.; Fimland, Bjørn-Ove; Weman, Helge; Van Helvoort, Antonius. (2016) Self-Induced Compositional Variations in GaAs/AlGaAs Core-Shell Nanowires. European Microscopy Congress 2016 . EMS; Lyon. 2016-08-28 - 2016-09-02.
Lecture

Ren, Dingding; Dheeraj, D.L.; Jin, C; Nilsen, Julie Stene; Huh, Junghwan; Reinertsen, Johannes F; Munshi, A; Gustafsson, Anders; Van Helvoort, Antonius; Weman, Helge; Fimland, Bjørn-Ove. (2016) Self-catalyzed GaAsSb nanowires grown on silicon and graphene by molecular beam epitaxy: high-yield with stabilized crystal phase. 7th NanoNetwork workshop . NanoNetwork; Trondheim. 2016-06-13 - 2016-06-15.
Lecture

Ren, Dingding; Dheeraj, D.L.; Nilsen, Julie Stene; Huh, Junghwan; Van Helvoort, Antonius; Weman, Helge; Fimland, Bjørn-Ove. (2016) Effects of Sb on Crystal Phase, Morphology and Optical Emission of Self-catalyzed GaAsSb Nanowires on Si(111) and Graphitic Substrates. 19th International Conference on Molecular Beam Epitaxy ; Montpellier. 2016-09-04 - 2016-09-09.
Lecture

Ren, Dingding; Huh, Junghwan; Dheeraj, D.L.; Weman, Helge; Fimland, Bjørn-Ove. (2016) Gadiffusion Induced Morphological and Compositional Variations in SelfCatalyzed GaAsSb Nanowire Array. MRS 2016 Fall Meeting NM1: Semiconducting Nanowires, Nanoribbons and HeterostructuresSynthesis, Characterizations and Functional Devices ; Boston. 2016-11-27 - 2016-12-02.
Lecture

Van Helvoort, Antonius; Fauske, Vidar Tonaas; Huh, Junghwan; Divitini, G; Dheeraj, D.L.; Munshi, A; Ducati, C; Weman, Helge; Fimland, Bjørn-Ove. (2016) The kinetics and dynamics of Au-GaAs solid state replacements, studied by in situ TEM. Dens preScandem Workshop . DENS; Trondheim. 2016-06-07 - 2016-06-07.
Lecture

Weman, Helge. (2016) AlGaN Nanowire/Graphene Deep UV LEDs. 13th China International Forum on Solid State Lighting (SSLCHINA 2016) ; Beijing. 2016-11-15 - 2016-11-17.
Academic lecture

Weman, Helge. (2016) Epitaxial growth of heterostructured III-V semiconductor nanowires on graphene. Invited talk in Prof. Zetian Mi's and Thomas Szkopek's group, McGill University, Montreal ; Montreal. 2016-10-21 - 2016-10-21.
Academic lecture

Weman, Helge. (2016) Epitaxial growth of semicondcutor nanowires on graphene. Invited talk in Prof. Bhattacharya's group, TIFR-Mumbai ; Mumbai. 2016-08-03 - 2016-08-03.
Lecture

Weman, Helge. (2016) Epitaxial growth of semiconductor nanostructures on graphene: A solution for UV LEDs. Graphene Canada 2016 ; Montreal. 2016-10-18 - 2016-10-20.
Lecture

Weman, Helge. (2016) Epitaxial growth of semiconductor nanostructures on graphene: Generic model and a potential first device application. NanoSpain 2016 ; Logrono. 2016-03-15 - 2016-03-18.
Interview

Weman, Helge. (2016) Grafén – fremtidens superstoff. NITO Refleks [Internett]. 2016-01-18.
Academic lecture

Weman, Helge. (2016) III-V semiconductor nanowires grown on Si and graphene for optoelctronic applications. Invited talk in Prof. Kawakami's group, Kyoto University, Japan ; Kyoto. 2016-04-20 - 2016-04-20.
Lecture

Weman, Helge. (2016) Ultraviolet LEDs: A killer application for graphene?. 2nd Annual China International Graphene Summit ; Shanghai. 2016-01-20 - 2016-01-21.

2015

Academic lecture

Fauske, Vidar Tonaas; Erlbeck, Maximilian; Huh, Junghwan; KIM, DONG CHUL; Munshi, Abdul Mazid; Dasa Lakshmi Narayana, Dheeraj; Weman, Helge; Fimland, Bjørn-Ove; Van Helvoort, Antonius. (2015) In-situ electronic probing of semiconducting nanowires in an electron microscope. 19th Microscopy of Semiconducting Materials . IoP/EMAG-group; Cambridge. 2015-03-29 - 2015-04-02.
Interview

Fimland, Bjørn-Ove; Weman, Helge. (2015) Denne lager superstoff som kan forandre verden. Universitetsavisa [Avis]. 2015-03-09.
Interview

Fimland, Bjørn-Ove; Weman, Helge. (2015) I verdenstoppen på nanoteknologi. Forskningsrådet FORNY [Internett]. 2015-03-10.
Academic lecture

Heilmann, Martin; Munshi, Abdul Mazid; Tessarek, Christian; Sarau, George; Bashouti, Mohammad; Göbelt, Manuela; Latzel, Michael; Hofmann, Björn; Weman, Helge; Christiansen, Silke. (2015) Metal-organic vapor phase epitaxy of GaN nanorods on graphene. 6th Int. symposium on growth of III-nitrides ; Hamamatsu. 2015-11-08 - 2015-11-13.
Poster

Huh, Junghwan; Yun, Hoyeol; Munshi, Abdul Mazid; Dasa Lakshmi Narayana, Dheeraj; Lee, Sang Wook; Kim, Dong-Chul; Fimland, Bjørn-Ove; Weman, Helge. (2015) Photocurrent Mapping of Single GaAsSb Nanowire Diodes. Nanowire Growth Workshop 2015 ; Barcelona. 2015-10-26 - 2015-10-30.
Poster

Høiaas, Ida Marie Eriksdatter; Ren, Dingding; KIM, DONG CHUL; Reinertsen, Johannes F; Fimland, Bjørn-Ove; Weman, Helge. (2015) GaAs Nanowire Growth on [111]-oriented Silicon with sub-grain Thickness. MyFab and NorFab user meeting ; Lund. 2015-04-21 - 2015-04-22.
Poster

Høiaas, Ida Marie Eriksdatter; Ren, Dingding; Reinertsen, Johannes F; KIM, DONG CHUL; Fimland, Bjørn-Ove; Weman, Helge. (2015) GaAs Nanowire Growth on [111]-oriented Silicon with sub-grain Thickness. Nano Network Workshop . Nano Network; Oslo. 2015-06-15 - 2015-06-17.
Lecture

Høiaas, Ida Marie; KIM, DONG CHUL; Weman, Helge. (2015) Silicon-graphene heterostructure for optoelectronic devices. 7th Nanonetwork workshop . Nano Network; Trondheim. 2015-06-13 - 2016-06-15.
Poster

Munshi, Abdul Mazid; Ren, Dingding; Dasa Lakshmi Narayana, Dheeraj; Fauske, Vidar Tonaas; Aas, Lars Martin Sandvik; Van Helvoort, Antonius; Weman, Helge; Fimland, Bjørn-Ove. (2015) On the growth of self-catalyzed GaAs nanowires on Si substrates: Opportunities and limitations. 31st North American Conference on Molecular Beam Epitaxy ; Mayan Riviera. 2015-10-04 - 2015-10-07.
Academic lecture

Nilsen, Julie Stene; Reinertsen, Johannes F; Mosberg, Aleksander Buseth; Fauske, Vidar Tonaas; Munshi, Abdul Mazid; Dasa Lakshmi Narayana, Dheeraj; Fimland, Bjørn-Ove; Weman, Helge; Van Helvoort, Antonius. (2015) Compositional variations in the shells of GaAs/AlGaAs core-shell nanowires. MMC/EMAG . RMS & IoP; Manchester. 2015-06-29 - 2015-07-02.
Poster

Nilsen, Julie Stene; Reinertsen, Johannes F; Mosberg, Aleksander Buseth; Fauske, Vidar Tonaas; Munshi, Abdul Mazid; Dasa Lakshmi Narayana, Dheeraj; Fimland, Bjørn-Ove; Weman, Helge; Van Helvoort, Antonius. (2015) Radial composition variations in the shells of GaAs/AlGaAs core-shell nanowires. Nano@NTNU . NTNU NanoLab; Trondheim. 2015-11-11 - 2015-11-11.
Poster

Nilsen, Julie Stene; Reinertsen, Johannes F; Mosberg, Aleksander Buseth; Fauske, Vidar Tonaas; Munshi, Abdul Mazid; Dasa Lakshmi Narayana, Dheeraj; Fimland, Bjørn-Ove; Weman, Helge; Van Helvoort, Antonius. (2015) Self-Induced Formation of Quantum Structures in the Shell of GaAs/AlGaAs Core-Shell Nanowires. Myfab/NorFab user meeting 2015 . NTNU NanoLab / MyFab; Lund. 2015-04-21 - 2015-04-22.
Poster

Reinertsen, Johannes F; Nilsen, Julie Stene; Mosberg, Aleksander Buseth; Fauske, Vidar Tonaas; Munshi, Abdul Mazid; Dasa Lakshmi Narayana, Dheeraj; Fimland, Bjørn-Ove; Van Helvoort, Antonius; Weman, Helge. (2015) Self-Induced Formation of Quantum Well Tubes in Self-Catalyzed GaAs/AlGaAs Core-Shell Nanowires. 582. WE-Heraeus-Seminar on III-V Nanowire Photonics ; Bad Honnef. 2015-03-22 - 2015-03-25.
Academic lecture

Ren, Dingding; Dasa Lakshmi Narayana, Dheeraj; Huh, Junghwan; Reinertsen, Johannes F; Munshi, Abdul Mazid; Kim, Dong-Chul; Van Helvoort, Antonius; Weman, Helge; Fimland, Bjørn-Ove. (2015) High-yield Self-catalyzed GaAsSb/GaAs Heterostructured Nanowire Array on Si(111) by Molecular Beam Epitaxy. Nanowire Growth Workshop 2015 ; Barcelona. 2015-10-26 - 2015-10-30.
Academic lecture

Ren, Dingding; Dheeraj, D.L.; Huh, Junghwan; Reinertsen, Johannes F; Mazid, A. M.; Kim, Dong-Chul; Van Helvoort, Antonius; Weman, Helge; Fimland, Bjørn-Ove. (2015) High-yield self-catalyzed GaAsSb/GaAs heterostructured nanowire array on Si(111) by molecular beam epitaxy. Nano@NTNU . NTNU NanoLab; Trondheim. 2015-11-11 - 2015-11-11.
Poster

Ren, Dingding; Høiaas, Ida Marie; Reinertsen, Johannes F; Dasa Lakshmi Narayana, Dheeraj; Munshi, Abdul Mazid; Huh, Junghwan; Kim, Dong-Chul; Weman, Helge; Fimland, Bjørn-Ove. (2015) Growth optimization for self-catalyzed GaAs nanowires on metal induced crystallized amorphous substrate. 31st North American Conference on Molecular Beam Epitaxy ; Mayan Riviera. 2015-10-04 - 2015-10-07.
Lecture

Weman, Helge. (2015) Deep Ultraviolet LEDs: A killer Application for Graphene?. Graphene and 2D Materials . IDTechEx; Berlin. 2015-04-28 - 2015-04-29.
Academic lecture

Weman, Helge. (2015) Epitaxial growth of semiconductor nanowires on graphene. 1st Int. Conf. on Graphene Technology ; Aveiro. 2015-07-20 - 2015-07-22.
Academic lecture

Weman, Helge. (2015) Epitaxial growth of semiconductor nanowires on graphene: Generic model and potential device applications. Graphene Science Symposium . GeneExpression Systems; Boston. 2015-09-21 - 2015-09-22.
Interview

Weman, Helge. (2015) Ett steg nærmere grafénprodukter. Elektronikknett no.1 2015 [Fagblad]. 2015-01-01.
Interview

Weman, Helge. (2015) Forskere vil bli kvitt kvikksølvlamper. Gemini [Tidsskrift]. 2015-07-02.
Programme participation

Weman, Helge. (2015) Grafén - framtidens vidundermateriale?. NRK Kunnskapskanalen [TV]. 2015-04-18.
Interview

Weman, Helge. (2015) Grafén-Stoffenes Usain Bolt. NITO Refleks medlemsavis Høst 2015 [Tidsskrift]. 2015-09-01.
Academic lecture

Weman, Helge. (2015) Heterostructured III-V nanowires grown on Si and graphene for photonic applications. Invited talk in Prof. Samuelson's group, Lund University, Sweden ; Lund. 2015-04-20 - 2015-04-20.
Lecture

Weman, Helge. (2015) High-efficiency AlGaN nanowire/graphene deep UV LEDs. LED Taiwan 2015 TechXPOT . Semi, Taiwan; Taipei. 2015-03-25 - 2015-03-27.
Academic lecture

Weman, Helge. (2015) III-V semiconductor nanowires grown by MBE on silicon and graphene for photonic applications. Invited talk in Prof. Silke Christiansen's group, Max Planck Inst., Erlangen . Max Planck Inst.; Erlangen. 2015-01-16 - 2015-01-16.
Academic lecture

Weman, Helge. (2015) III-V semiconductor nanowires on graphene for photonic applications. Invited talk in Prof. Zhiqiang Liu's group, State Key Lab on Solid State Lighting . Chinese Academy of Science, Semiconductor Institute; Beijing. 2015-11-08 - 2015-11-08.
Academic lecture

Weman, Helge. (2015) III-V semiconductor nanowiress grown on Si and graphene for photonic applications. Invited talk in Prof. Kishino's group, Sophia University, Tokyo ; Tokyo. 2015-02-16 - 2015-02-16.
Popular scientific lecture

Weman, Helge. (2015) Lysdioder. Invetert forelesning for 4e klasse Energi og Miljø . NTNU; Trondheim. 2015-09-28 - 2015-09-28.
Interview

Weman, Helge. (2015) Materials Innovations Help LEDs Turn On. Photonics Spectra June 2015 [Tidsskrift]. 2015-06-01.
Interview

Weman, Helge. (2015) Nanordsun; Semiconductor nanowire-based solar cells. Solving the Climate Crisis- A Nordic Contribution [Tidsskrift]. 2015-09-01.
Popular scientific lecture

Weman, Helge. (2015) Nanoteknologi. Teknologisprang for utvikling av havrommet . NTVA; Trondheim. 2015-09-09 - 2015-09-09.
Lecture

Weman, Helge. (2015) Nanowire/Graphene UV LEDs. China Graphene Innovation Award . China Innovation Alliance of the Graphene Industry; Wuxi. 2015-09-05 - 2015-09-05.
Interview

Weman, Helge. (2015) Nobelprisen i fysikk 2014. Fra fysikkens verden no.1 2015 [Avis]. 2015-01-01.
Interview

Weman, Helge. (2015) Norske forskere vil utkonkurrere kvikksølv i vannrensing. Teknisk Ukeblad [Tidsskrift]. 2015-07-02.
Interview

Weman, Helge. (2015) -Når vi lykkes, vil vi tjene store penger. Dagens Näringsliv [Avis]. 2015-11-30.
Lecture

Weman, Helge. (2015) Selective-area growth of GaN/AlGaN nanostructures on graphene for high-efficiency deep UV LEDs. 12th China international forum on solid state lighting ; Shenzhen. 2015-11-02 - 2015-11-04.
Interview

Weman, Helge. (2015) 단일 나노선 고효율 응용소자’ 개발 High-efficiency single nanowire device developed. ConsumerWide [Internett]. 2015-05-22.

2014

Academic lecture

Fauske, Vidar Tonaas; Huh, Junghwan; Erlbeck, Maximilian; KIM, DONG CHUL; Munshi, Abdul Mazid; Dasa Lakshmi Narayana, Dheeraj; Weman, Helge; Fimland, Bjørn-Ove; Van Helvoort, Antonius. (2014) In-situ electronic probing of nanostructures in a FIB. Nanolab 10th aniversium . NTNU Nanolab; Trondheim. 2014-11-10 - 2014-11-11.
Academic lecture

Huh, Junghwan; Yun, H.; KIM, DONG CHUL; Munshi, Abdul Mazid; Dasa Lakshmi Narayana, Dheeraj; Kauko, Hanne; Van Helvoort, Antonius; Lee, SW; Fimland, Bjørn-Ove; Weman, Helge. (2014) GaAsSb nanowire diodes based on self-induced compositional variation. Nanowire2014 ; Eindhoven. 2014-08-25 - 2014-08-29.
Poster

Kauko, Hanne; Grieb, Tim; Munshi, Abdul Mazid; Müller, Knut; Weman, Helge; Rosenauer, A.; Fimland, Bjørn-Ove; Van Helvoort, Antonius. (2014) The outward diffusion of Sb during growth of antimonide III-V nanowires. 8th Nanowire Growth Workshop ; Eindhoven. 2014-08-25 - 2014-08-27.
Academic lecture

Lim, Cheng Guan; Weman, Helge. (2014) Enhancing the Light-Matter Interactions in Radial p-n Junction Core-Shell Nanowires for Highly Efficient Nanowire Solar Cells. MRS 2014Spring Meeting ; San Francisco. 2014-04-21 - 2014-04-25.
Poster

Lim, Cheng Guan; Weman, Helge. (2014) Optimal Solar Cell Efficiency of Radial p-n Junction GaAs/AlGaAs Core-Shell Nanowire Arrays. EU PVSEC 2014 ; Amsterdam. 2014-09-22 - 2014-09-26.
Academic lecture

Munshi, Abdul Mazid; Dasa Lakshmi Narayana, Dheeraj; Fauske, Vidar Tonaas; Reinertsen, Johannes F; Ahtapodov, Lyubomir; Lee, KD; Heidari, B.; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2014) Position controlled GaAs nanowires on 2-inch Si wafers using nanoimprint lithography. MRS Spring Meeting . MRS; San Francisco. 2014-04-22 - 2014-04-22.
Poster

Munshi, Abdul Mazid; Dasa Lakshmi Narayana, Dheeraj; Fauske, Vidar Tonaas; Ren, Dingding; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2014) Limitations of self-catalytic growth in controlling the diameter of GaAs nanowires on Si substrates. MBE2014 ; Flagstaff. 2014-09-07 - 2014-09-12.
Poster

Munshi, Abdul Mazid; Dasa Lakshmi Narayana, Dheeraj; Fauske, Vidar Tonaas; Ren, Dingding; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2014) Limitations of self-catalytic growth in controlling the diameter of GaAs nanowires on Si substrates. Nanowire2014 ; Eindhoven. 2014-08-25 - 2014-08-29.
Academic lecture

Signorello, G.; Lörtscher, E; Khomyakov, P.A.; Karg, S.; Dasa Lakshmi Narayana, Dheeraj; Gotsmann, B.; Weman, Helge; Riel, H.. (2014) Inducing a Direct-to-Pseudodirect Bandgap Transition in Wurtzite GaAs Nanowires with Uniaxial Stress. MRS 2014Spring Meeting ; San Francisco. 2014-04-21 - 2014-04-25.
Academic lecture

Signorello, G.; Lörtscher, E; Khomyakov, P.A.; Karg, S.; Dasa Lakshmi Narayana, Dheeraj; Gotsmann, B.; Weman, Helge; Riel, H.. (2014) Inducing a direct-to-pseudodirect bandgap transition in wutzite GaAs nanowires with uniaxial stress. Nanowire2014 ; Eindhoven. 2014-08-25 - 2014-08-29.
Academic lecture

Svendsen, Guro Kristin; Skaar, Johannes; Weman, Helge; Dupertuis, M.-A.. (2014) Symmetries and optical transitions of hexagonal quantum dots in GaAs/AlGaAs nanowires. ICPS 2014 ; Austin, Texas, USA. 2014-08-10 - 2014-08-15.
Interview

Weman, Helge. (2014) Bedre solceller og LED-lys. Aftenposten [Avis]. 2014-04-11.
Interview

Weman, Helge. (2014) Better solar cells, better LED light and vast optical possibilities. phys.org [Internett]. 2014-04-14.
Interview

Weman, Helge. (2014) Better solar cells, better LED light and vast optical possibilities. Science Daily [Internett]. 2014-04-11.
Interview

Weman, Helge. (2014) Dette er fremtidens supermateriale. Adressa [Avis]. 2014-03-26.
Interview

Weman, Helge. (2014) Fremtidens supermateriale. Aftenposten [Avis]. 2014-03-25.
Interview

Weman, Helge. (2014) Graphene and a modified structure of nanowires will improve solar cells and LED lighting. alternative-energies.net [Internett]. 2014-04-18.
Interview

Weman, Helge. (2014) Grønt lys for en ny verden. Tekna Magasinet No.1 2014 [Tidsskrift]. 2014-02-18.
Popular scientific lecture

Weman, Helge. (2014) Halvleder-nanotråder på grafén for neste generasjon IKT. Invetert forelesning for 1e klasse ELSYS . NTNU; Trondheim. 2014-11-22 - 2014-11-22.
Academic lecture

Weman, Helge. (2014) Heterostructured III-V nanowires grown on Si and graphene for photonic applications. Invited Seminar in Prof. Xiong Qihua's group at Nanyang Technical Univeristy, Singapore ; Singapore. 2014-03-12 - 2014-03-12.
Academic lecture

Weman, Helge. (2014) How a Norwegian university project became the nanotech start-up CrayoNano. Invited talk :International Forum on the Nanotechnology Commercialization 2014" ; Seoul. 2014-06-11 - 2014-06-12.
Interview

Weman, Helge. (2014) IBM Combines Light Emission and Detection in Single Nanowire. IEEE Spectrum [Tidsskrift]. 2014-04-14.
Academic lecture

Weman, Helge. (2014) III-V semiconductor nanowires@NTNU. Nanolab 10th aniversium . NTNU Nanolab; Trondheim. 2014-11-10 - 2014-11-11.
Interview

Weman, Helge. (2014) Nano-kongene. Finansavisen [Avis]. 2014-08-23.
Interview

Weman, Helge. (2014) Nanokunnskap gir supersolceller. Gemini.no og forskning.no [Internett]. 2014-04-11.
Interview

Weman, Helge. (2014) Nanowire light-emitting diodes. nanotechmag.com [Internett]. 2014-04-10.
Interview

Weman, Helge. (2014) New physical phenomenon on nanowires seen for the first time. phys.org [Internett]. 2014-04-14.
Interview

Weman, Helge. (2014) New physical phenomenon on nanowires seen for the first time. nanowerk.com [Internett]. 2014-04-11.
Popular scientific lecture

Weman, Helge. (2014) Nobelprisen i fysikk 2014. Årets Nobelpris i fysikk . GLØSHAUGENS AKADEMIKERE; Trondheim. 2014-12-18 - 2014-12-18.
Interview

Weman, Helge. (2014) Smått og godt. Dagens Næringsliv [Avis]. 2014-04-10.
Interview

Weman, Helge. (2014) Strain and light emission in gallium arsenide nanowires. Semiconductor-today.com [Tidsskrift]. 2014-04-28.
Interview

Weman, Helge. (2014) Stress Activates Light-Emitting Nanowires. Photonics [Tidsskrift]. 2014-04-23.
Academic lecture

Weman, Helge. (2014) Towards flexible high-efficiency semiconductor nanowire/graphene solar cells. Invited talk: Nanofair 2014 ; Dresden. 2014-07-01 - 2014-07-03.
Academic lecture

Weman, Helge. (2014) Towards low cost high efficiency semiconductor nanowire graphene solar cells. Invited talk: 1 st International Symposium on Energy Challenges and Mechanics ; Aberdeen. 2014-07-08 - 2014-07-10.
Academic lecture

Weman, Helge. (2014) Towards low-cost, high-efficiency semiconductor nanowire/graphene solar cells. Bring the Nanoworld Together . IIT Delhi & Oxford Instruments; New Delhi. 2014-11-27 - 2014-11-28.
Interview

Weman, Helge. (2014) Tuning a single nanowire improves solar cells and LEDs. nanowerk.com [Internett]. 2014-04-11.
Interview

Weman, Helge. (2014) Tweaking nanowires boosts solar cell and LED outputs. optics.org [Internett]. 2014-04-24.

2013

Poster

Ahtapodov, Lyubomir; Kauko, Hanne; Munshi, Abdul Mazid; Fimland, Bjørn-Ove; Van Helvoort, Antonius; Weman, Helge. (2013) Optical properties of self-catalyzed GaAs Nanowires with axial GaAsSb inserts. Nanowires-2013 ; Rehovot. 2013-11-12 - 2013-11-15.
Academic lecture

Ahtapodov, Lyubomir; Todorovic, Jelena; Reinertsen, Johannes F; Dasa Lakshmi Narayana, Dheeraj; Munshi, Abdul Mazid; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2013) Optical Characterization of Single Semiconductor Nanowires. MYFAB&NORFAB Meetting . Myfab og Norfab; Uppsala. 2013-04-17 - 2013-04-18.
Poster

Dasa Lakshmi Narayana, Dheeraj; Munshi, Abdul Mazid; Fauske, Vidar Tonaas; KIM, DONG CHUL; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2013) Epitaxial growth and characterization of vertical III-V semiconductor nanowires on graphene. 7th Nanowire Growth Workshop ; Lausanne. 2013-06-10 - 2013-06-12.
Poster

Dasa Lakshmi Narayana, Dheeraj; Munshi, Abdul Mazid; Fauske, Vidar Tonaas; KIM, DONG CHUL; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2013) Epitaxial growth of vertical III-V semiconductor nanowires on graphene. Graphene2013 ; Bilbao. 2013-04-23 - 2013-04-26.
Academic lecture

Fauske, Vidar Tonaas; KIM, DONG CHUL; Munshi, Abdul Mazid; Dasa Lakshmi Narayana, Dheeraj; Fimland, Bjørn-Ove; Weman, Helge; Van Helvoort, Antonius. (2013) In-situ electrical and structural characterization of individual GaAs nanowire. EMAG2013 . IoP-EMAG; York. 2013-09-02 - 2013-09-06.
Academic lecture

Fauske, Vidar Tonaas; KIM, DONG CHUL; Munshi, Abdul Mazid; Dasa Lakshmi Narayana, Dheeraj; Fimland, Bjørn-Ove; Weman, Helge; Van Helvoort, Antonius. (2013) Mechanical and electrical characterization of nanowire-substrate interfaces. 4th Annual Nanonetwork Workshop . Nanonetwork; Bergen. 2013-06-17 - 2013-06-19.
Poster

Fauske, Vidar Tonaas; Munshi, Abdul Mazid; Dasa Lakshmi Narayana, Dheeraj; KIM, DONG CHUL; Fimland, Bjørn-Ove; Weman, Helge; Van Helvoort, Antonius. (2013) Site-specific, cross-sectional TEM samples of as-grown nanowires by FIB. NorfFab/MyFab user meeting . NorFab/MyFab; Uppsala. 2013-04-17 - 2013-04-18.
Poster

Ghalamestani, Sepideh Gorji; Munshi, Abdul Mazid; Dasa Lakshmi Narayana, Dheeraj; Fimland, Bjørn-Ove; Weman, Helge; Dick, Kimberly A. (2013) Self-catalyzed MBE grown GaAs/GaAsSb core-shell nanowires in ZB and WZ crystal structures. 7th Nanowire Growth Workshop ; Lausanne. 2013-06-10 - 2013-06-12.
Academic lecture

Huh, Junghwan; KIM, DONG CHUL; Yun, H.; Munshi, Abdul Mazid; Dasa Lakshmi Narayana, Dheeraj; Kauko, Hanne; Van Helvoort, Antonius; Lee, S.W.; Fimland, Bjørn-Ove; Weman, Helge. (2013) Electrical Characteristics of Individual GaAsSb Nanowires Grown by Molecular Beam Epitaxy. 8th Nanolab usermeeting . NTNU Nanolab; Trondheim. 2013-11-12 - 2013-11-12.
Academic lecture

Huh, Junghwan; Kim, Dong-Chul; Yun, H.; Munshi, Abdul Mazid; Dasa Lakshmi Narayana, Dheeraj; Kauko, Hanne; Van Helvoort, Antonius; Lee, S.W.; Fimland, Bjørn-Ove; Weman, Helge. (2013) Effects on compositional variation on the electrical property of GaAsSb nanowires. MRS 2013 Fall Meeting . MRS; Boston. 2013-12-02 - 2013-12-06.
Poster

Huh, Junghwan; Kim, Dong-Chul; Yun, H.; Munshi, Abdul Mazid; Dasa Lakshmi Narayana, Dheeraj; Kim, G.T.; Lee, S.W.; Fimland, Bjørn-Ove; Weman, Helge. (2013) Electrical properties of III-V semiconductor nanowires for solar cell applications. 4th Annual Nanonetwork Workshop ; Bergen. 2013-06-17 - 2013-06-19.
Poster

Kauko, Hanne; Munshi, Abdul Mazid; Lim, Cheng Guan; KIM, DONG CHUL; Dasa Lakshmi Narayana, Dheeraj; Fimland, Bjørn-Ove; Van Helvoort, Antonius; Weman, Helge. (2013) GaAs/AlGaAs core-shell nanowires for novel solar cell applications. Nanokonferansen 2013 . NRF; Oslo. 2013-03-18 - 2013-03-18.
Poster

Kauko, Hanne; Munshi, Abdul Mazid; Lim, Cheng Guan; KIM, DONG CHUL; Dasa Lakshmi Narayana, Dheeraj; Fimland, Bjørn-Ove; Van Helvoort, Antonius; Weman, Helge. (2013) GaAs/AlGaAs core-shell nanowires for novel solar cell applications. Norwegian Solar Cell Conferance 2013 . FME sol; Oppdal. 2013-03-13 - 2013-03-15.
Poster

Kauko, Hanne; Munshi, Abdul Mazid; Lim, Cheng Guan; KIM, DONG CHUL; Dasa Lakshmi Narayana, Dheeraj; Fimland, Bjørn-Ove; Van Helvoort, Antonius; Weman, Helge. (2013) Novel solar cells based on GaAs/AlGaAs core-shell nanowires. 4th annual Nanonetwork workshop . Nanonetwork; Bergen. 2013-06-17 - 2013-06-19.
Poster

Lim, Cheng Guan; Weman, Helge. (2013) Design guidelines for radial p-n junction GaAs/AlGaAs core-shell nanowire solar cells. Nanowires-2013 ; Rehovot. 2013-11-12 - 2013-11-15.
Academic lecture

Lim, Cheng Guan; Weman, Helge. (2013) Numerical Analysis and Device Optimization of Radial p-n Junction GaAs/AlGaAs Core-Shell Nanowire Solar Cells. 13th Int. Conf. on Numerical Simulations of Optoelectronic Devices ; Vancouver. 2013-08-19 - 2013-08-22.
Poster

Munshi, Abdul Mazid; Dasa Lakshmi Narayana, Dheeraj; Fauske, Vidar Tonaas; KIM, DONG CHUL; Todorovic, Jelena; Huh, Junghwan; Sandell, Susanne; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2013) GaAs nanowires grown on silicon and graphene for solar cell application. 4th annual NanoNetwork Workshop . Nanonetwork; Bergen. 2013-06-17 - 2013-06-19.
Poster

Munshi, Abdul Mazid; Dasa Lakshmi Narayana, Dheeraj; Fauske, Vidar Tonaas; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2013) Limitations of self-catalytic growth in controlling diameter of GaAs nanowires on Si substrates. 7th Nanowire Growth Workshop ; Lausanne. 2013-06-10 - 2013-06-12.
Popular scientific lecture

Munshi, Abdul Mazid; Dasa Lakshmi Narayana, Dheeraj; KIM, DONG CHUL; Huh, Junghwan; Reinertsen, Johannes F; Ahtapodov, Lyubomir; Fimland, Bjørn-Ove; Weman, Helge; Fauske, Vidar Tonaas; Kauko, Hanne; Van Helvoort, Antonius; Lee, KD; heidari, B. (2013) Position Controlled GaAs Nanowires on Si using Nanoimprint Lithography. 8th Nanolab usermeeting . NTNU Nanolab; Trondheim. 2013-11-12 - 2013-11-12.
Poster

Nam, J.; Kim, Dong-Chul; Andersen, P.C.; Park, S.J.; Dae, D.J.; Munshi, Abdul Mazid; Dasa Lakshmi Narayana, Dheeraj; Fimland, Bjørn-Ove; Weman, Helge; Seo, S.; Kim, K.S.. (2013) Synthesis and characterization of graphene on Pt using CVD. Korean Physical Society Spring Meeting ; Daejon. 2013-04-24 - 2013-04-26.
Interview

Weman, Helge. (2013) En planlagt tilfeldighet. Forskingsbladet [Avis]. 2013-06-07.
Academic lecture

Weman, Helge. (2013) Epitaxial growth of semiconductor nanowires on graphene:Generic model and potential device applications. Physical Sciences Symposia – 2013 on ‘Crystal & Graphene Science ; Boston. 2013-09-04 - 2013-09-05.
Academic lecture

Weman, Helge. (2013) Epitaxial growth of vertical III-V semiconductor nanowires on graphene. The Collaborative Conference on Crystal Growth ; Cancun. 2013-06-10 - 2013-06-13.
Interview

Weman, Helge. (2013) Grafen forstærker lysets kraft. Videnskap DK [Internett]. 2013-04-01.
Interview

Weman, Helge. (2013) Grafén – supermateriale som vil revolusjonere fremtidens datamaskin. IKT nytt [Internett]. 2013-07-13.
Popular scientific lecture

Weman, Helge. (2013) Grafén-og nanoblyanter. Kunnskapsbyen . Arnfinn Stendahl Rokne, NTNU; Trondheim. 2013-11-27 - 2013-11-27.
Interview

Weman, Helge. (2013) Graphene and Semiconductor Technology Together: Smaller, Cheaper, Better. Science Daily [Internett]. 2013-06-11.
Interview

Weman, Helge. (2013) Graphene and semiconductor technology together: smaller, cheaper, better. Forskningsrådet [Internett]. 2013-05-30.
Academic lecture

Weman, Helge. (2013) Heterostructured III-V nanowires grown by molecular beam epitaxy on Si and graphene substrates. Invited talk in Prof. Yapin Dang's group at Jia Tong University ; Shanghai. 2013-03-13 - 2013-03-13.
Academic lecture

Weman, Helge. (2013) Heterostructured III-V nanowires grown by molecular beam epitaxy on Si and graphene substrates. Invited talk in Prof. Wei Lu's group at Shanghai Institute of Technical Physics, ; Shanghai. 2013-03-12 - 2013-03-12.
Academic lecture

Weman, Helge. (2013) Heterostructured III-V nanowires grown on Si and graphene for photonic applications. Invited talk at University of Copenhagen ; Copenhagen. 2013-11-01 - 2013-11-01.
Academic lecture

Weman, Helge. (2013) Heterostructured III-V nanowires grown on Si and graphene for photonic applications. Invited talk in Xiamin Ren's group at Beijing University of Posts and Telecommunications ; Beijing. 2013-03-22 - 2013-03-22.
Academic lecture

Weman, Helge. (2013) Heterostructured III-V nanowires grown on Si and graphene for photonic applications. Invited talk in Prof. Jianhua Zhao's group at Inst. of Semiconductors Chinese Academy of Sciences ; Beijing. 2013-03-25 - 2013-03-25.
Academic lecture

Weman, Helge. (2013) Heterostructured III-V nanowires grown on Si and graphene for solar cell applications. Invited talk in Prof. Hingwei Zhu's group at Tsinghua University ; Beijing. 2013-03-22 - 2013-03-22.
Academic lecture

Weman, Helge. (2013) Heterostructured III-V nanowires grown on Si and graphene substrates for photonic applications. Invited talk in Prof. Yong-Hee Lee's group at Sungkyunkwan University ; Suwon. 2013-03-19 - 2013-03-19.
Academic lecture

Weman, Helge. (2013) III-V nanowire/graphene hybrid structures-A platform for future devices. Nanoscale communication technologies . NTNU; Trondheim. 2013-10-17 - 2013-10-17.
Lecture

Weman, Helge. (2013) II-V semiconductor nanowire project at NTNU. Norway-Texas meeting at NTNU . NTNU Nanolab and Rice University; Trondheim. 2013-10-15 - 2013-10-15.
Interview

Weman, Helge. (2013) Mirakelmaterialet grafén vil føre til revolusjoner innen teknologi. Hardware.no [Internett]. 2013-09-03.
Interview

Weman, Helge. (2013) Måtte holde teknologien hemmelig. Teknisk Ukeblad [Internett]. 2013-02-04.
Lecture

Weman, Helge. (2013) NaNordSun-Semiconductor Nanowire Based Solar Cells. Nordic Innovation meeting on Top-level Research Initiative . Nordic Innovation; Copenhagen. 2013-11-22 - 2013-11-22.
Academic lecture

Weman, Helge. (2013) Semiconductor nanowires grown on graphene. 4th annual NanoNetwork Workshop ; Bergen. 2013-06-17 - 2013-06-19.
Programme participation

Weman, Helge; Fimland, Bjørn-Ove; Kim, Dong-Chul. (2013) Grafén-Forbløffende superstoff. NRK Schrödingers katt [TV]. 2013-03-14.
Interview

Weman, Helge; Fimland, Bjørn-Ove; Kim, Dong-Chul. (2013) På vei mot noe stort. Forskningsrådet [Internett]. 2013-05-15.

2012

Academic lecture

Ahtapodov, Lyubomir; Olk, Phillip; Todorovic, Jelena; Mjåland, Terje Sund; Slåttnes, Patrick Rene Tollefsen; Dasa Lakshmi Narayana, Dheeraj; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2012) Combined micro-photoluminescence and electron microscopy investigation of single GaAs nanowires. ICPS2012 ; Zurich. 2012-07-29 - 2012-08-03.
Academic lecture

Ahtapodov, Lyubomir; Snustad, Ingrid; Gulla, Stian; Munshi, Abdul Mazid; Fimland, Bjørn-Ove; Van Helvoort, Antonius; Weman, Helge. (2012) Correlated micro photoluminescence and transmission electron microscopy on single self‐assisted GaAs/AlGaAs core‐shell nanowires. 7th Nanolab usermeeting . NTNU Nanolab; Trondheim. 2012-12-12 - 2012-12-12.
Academic lecture

Ahtapodov, Lyubomir; Todorovic, Jelena; Olk, Phillip; Kim, Dong Chul; mjaaland, T.S.; Eriksson, M; Dasa Lakshmi Narayana, Dheeraj; Van Helvoort, Antonius; Bergman, P; Fimland, Bjørn-Ove; Weman, Helge. (2012) Wurtzite versus Zincblende GaAs – A Thorough Comparison. MRS 2012 Spring Meeting ; San Francisco. 2012-04-09 - 2012-04-13.
Poster

Ahtapodov, Lyubomir; Todorovic, Jelena; Olk, Phillip; mjaaland, T.S.; Slaattnes, P.R.T.; Dasa Lakshmi Narayana, Dheeraj; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2012) Optical Characterization of Single GaAs/AlGaAs Nanowires with Combined Photoluminescence Spectroscopy and Transmission Electron Microscopy on the Same Nanowire. 3rd Nano-network Workshop . Nano-network; Trondheim. 2012-06-11 - 2012-06-13.
Academic lecture

Dasa Lakshmi Narayana, Dheeraj; DONG CHUL, KIM; Munshi, Abdul Mazid; Lim, Cheng Guan; Fauske, Vidar Tonaas; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2012) III-V semiconductor nanowire based solar cells. Mini‐workshop on materials for solar cells and other optoelectronic applications . Turid Worren Reenaas; NTNU, Trondheim. 2012-09-11.
Poster

Dasa Lakshmi Narayana, Dheeraj; Munshi, Abdul Mazid; Christoffersen, Ole Morten; DONG CHUL, KIM; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2012) Growth and characterization of Be-doped GaAs nanowires grown by Au- and Ga-assisted molecular beam epitaxy. MBE2012 ; Nara. 2012-09-23 - 2012-09-28.
Poster

Fauske, Vidar Tonaas; Munshi, Abdul Mazid; Dasa Lakshmi Narayana, Dheeraj; DONG CHUL, KIM; Fimland, Bjørn-Ove; Weman, Helge; Van Helvoort, Antonius. (2012) FIB prepared site-specific cross-sectional TEM specimen of nanowire-substrate interfaces. 7th Nanolab usermeeting . NTNU Nanolab; Trondheim. 2012-12-12 - 2012-12-12.
Poster

Fauske, Vidar Tonaas; Munshi, Abdul Mazid; Dasa Lakshmi Narayana, Dheeraj; DONG CHUL, KIM; Fimland, Bjørn-Ove; Weman, Helge; Van Helvoort, Antonius. (2012) Site-specific, cross-sectional TEM samples of as-grown nanowires by FIB. 15th EMC . EMC; Manchester. 2012-09-16 - 2012-09-21.
Poster

Fauske, Vidar Tonaas; Munshi, Abdul Mazid; Dasa Lakshmi Narayana, Dheeraj; Kim, Dong Chul; Fimland, Bjørn-Ove; Weman, Helge; Van Helvoort, Antonius. (2012) Characterization of the Interface between GaAs Nanowires and a 111-Si Substrate. MRS 2012 Spring Meeting . MRS; San Francisco. 2012-04-09 - 2012-04-13.
Academic lecture

Fauske, Vidar Tonaas; Munshi, Abdul Mazid; Dasa Lakshmi Narayana, Dheeraj; Kim, Dong Chul; Fimland, Bjørn-Ove; Weman, Helge; Van Helvoort, Antonius. (2012) Transmission Electron Microscopy Study of Defects at the Interface between GaAs Nanowires and a Si-111 Substrate. 3rd Nano-network Workshop . Nano-network; Trondheim. 2012-06-11 - 2012-06-13.
Academic lecture

Kim, Dong Chul; Ahtapodov, Lyubomir; Dasa Lakshmi Narayana, Dheeraj; Todorovic, Jelena; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2012) Photocurrent study of Single Wurtzite AlGaAs-GaAs Core/shell nanowires. MRS 2012 Spring Meeting . MRS; San Francisco. 2012-04-09 - 2012-04-13.
Academic lecture

Kim, Dong Chul; Munshi, Abdul Mazid; Dasa Lakshmi Narayana, Dheeraj; Lim, Cheng Guan; Fauske, Vidar Tonaas; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2012) Semiconductor Nanowire Based Solar Cells-A Nordic Top-level Research Initiative. Technoporten ; Trondheim. 2012-04-16 - 2012-04-18.
Poster

Kim, Dong-Chul; Dasa Lakshmi Narayana, Dheeraj; Fimland, Bjørn-Ove; Weman, Helge. (2012) Investigation of wurtzite GaAs nanowires by polarization dependent photocurrent spectroscopy. ICPS 2012 ; Zurich. 2012-07-29 - 2012-08-03.
Academic lecture

Munshi, Abdul Mazid; Dasa Lakshmi Narayana, Dheeraj; DONG CHUL, KIM; Todorovic, Jelena; Fauske, Vidar Tonaas; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2012) Self-catalyzed GaAs nanowires grown by molecular beam epitaxy. Mini‐workshop on materials for solar cells and other optoelectronic applications . Turid Worren Reenaas; NTNU, Trondheim. 2012-09-11.
Academic lecture

Munshi, Abdul Mazid; Dasa Lakshmi Narayana, Dheeraj; Fauske, Vidar Tonaas; DONG CHUL, KIM; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2012) A generic model and experimental demonstration of epitaxial growth of GaAs nanowires on graphene layers. MBE2012 ; Nara. 2012-09-23 - 2012-09-28.
Academic lecture

Munshi, Abdul Mazid; Dasa Lakshmi Narayana, Dheeraj; Fauske, Vidar Tonaas; DONG CHUL, KIM; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2012) Epitaxial Growth of High Quality Vertical GaAs Nanowires on Graphene by Molecular Beam Epitaxy. MRS Autumn meeting . MRS; Boston. 2012-11-25 - 2012-11-25.
Academic lecture

Munshi, Abdul Mazid; Dasa Lakshmi Narayana, Dheeraj; Fauske, Vidar Tonaas; DONG CHUL, KIM; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2012) Epitaxial growth of semiconductor III-V nanowires on graphene: A template for future opto-electronic device applications. 7th Nanolab usermeeting . NTNU Nanolab; Trondheim. 2012-12-12 - 2012-12-12.
Academic lecture

Munshi, Abdul Mazid; Dasa Lakshmi Narayana, Dheeraj; Kim, Dong Chul; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2012) Zinc blende and wurtzite GaAs nanowires grown by self-catalyzed molecular beam epitaxy. MRS 2012 Spring Meeting . MRS; San Francisco. 2012-04-09 - 2012-04-13.
Academic lecture

Munshi, Abdul Mazid; Dasa Lakshmi Narayana, Dheeraj; Todorovic, Jelena; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2012) Crystal phase tuning in self-catalyzed GaAs nanowires induced by Ga-droplet contact angle. MBE2012 ; Nara. 2012-09-23 - 2012-09-28.
Academic lecture

Munshi, Abdul Mazid; Dasa Lakshmi Narayana, Dheeraj; Todorovic, Jelena; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2012) GaAs nanowires grown on Si substrates: Crystal phase perfection, heterostructures and position control. 3rd Nano-network Workshop . Nano-network; Trondheim. 2012-06-11 - 2012-06-11.
Academic lecture

Todorovic, Jelena; Anthonysamy, Fervin Moses; Ahtapodov, Lyubomir; Dasa Lakshmi Narayana, Dheeraj; Fimland, Bjørn-Ove; Weman, Helge; Van Helvoort, Antonius. (2012) Correlation of optical and structural properties of single semiconductor heterostructured nanowires. Scandem 2012 . Scandem; Bergen. 2012-06-13 - 2012-06-15.
Popular scientific lecture

Weman, Helge. (2012) Commercialisation of Nanotechnology. Annual Top level Research program meeting 2012 . NordForsk; Helsinki. 2012-10-29 - 2012-10-30.
Interview

Weman, Helge. (2012) Graphene Replaces Traditional Silicon Substrates in Future Devices. IEEE Spectrum [Internett]. 2012-09-28.
Popular scientific lecture

Weman, Helge. (2012) Halvleder nanotråder. Innovasjon Norge (medisin) besöker Trondheim . NTNU/Catharina De Lange Davies; Trondheim. 2012-06-28 - 2012-06-28.
Academic lecture

Weman, Helge. (2012) Heterostructured III-V nanowires grown by MBE. Invited Seminar in Prof. Xianfen Duan's group at UCLA ; UCLA. 2012-04-16 - 2012-04-16.
Academic lecture

Weman, Helge. (2012) Heterostructured III-V nanowires grown by molecular beam epitaxy for photonic applications. Invited talk in Prof. Ruoff's group at University of Texas, Austin ; 2012-11-12 - 2012-11-12.
Academic lecture

Weman, Helge. (2012) Heterostructured III-V semiconductor nanowires for solar cell applications. Invited Seminar in Prof. SangWook Lee's group at Kunkuk Uni, Seoul . Department of Physics, Konkuk University; Seoul. 2012-05-15 - 2012-05-15.
Academic lecture

Weman, Helge. (2012) Heterostructured III-V semiconductor nanowires grown by Au and self-catalyzed MBE. Invited talk in Prof. Yi's group at Seoul National University ; 2012-10-05 - 2012-10-05.
Academic lecture

Weman, Helge. (2012) Heterostructured III-V semiconductor nanowires grown by Au and self-catalyzed MBE. Invited talk in Dr.Notomi's group at NTT Basic Res. Lab, Atsugi ; 2012-10-03 - 2012-10-03.
Academic lecture

Weman, Helge. (2012) Heterostructured III-V semiconductor nanowires grown by Au and self-catalyzed MBE. Invited talk in Prof. Fukui's group at Hokkaido University, Sapporo ; Sapporo. 2012-10-01 - 2012-10-01.
Academic lecture

Weman, Helge. (2012) III-V Nanowire Solar Cells. Invited talk at 2012 meeting of The Norwegian Research Centre for Solar Cell Technology . Solar United; Trondheim. 2012-05-23 - 2012-05-23.
Academic lecture

Weman, Helge. (2012) III-V nanowires for high-efficiency solar cells. Transatlantic Science Week. Invited talk at "Nano-enabling technologies" ; Houston. 2012-11-14 - 2012-11-14.
Interview

Weman, Helge. (2012) NTNU-gjennombrudd for nanotråder på grafen. Digi.no [Internett]. 2012-09-11.
Popular scientific lecture

Weman, Helge. (2012) Nanoteknologi- Vad er det?. Luftkrigsskolen, Trondheim . Luftkrigsskolen, Trondheim; Trondheim. 2012-01-17 - 2012-01-17.
Interview

Weman, Helge. (2012) Researchers claim semiconductors grown on graphene. EE times [Internett]. 2012-09-10.
Interview

Weman, Helge. (2012) Scientists create ultra-thin, cheap, flexible, transparent graphene semiconductors. Gizmag [Internett]. 2012-09-28.
Popular scientific lecture

Weman, Helge. (2012) Semiconductor nanowires on graphene for next generation ICT. ITovation day 2012 . IME NTNU; 2012-11-27 - 2012-11-27.
Interview

Weman, Helge. (2012) Supertynt stoff kan strupe solindustrien. Dagens Næringsliv [Avis]. 2012-09-11.
Interview

Weman, Helge. (2012) 挪威科研人员成功研制半导体新材料. China.gov [Internett]. 2012-10-31.
Interview

Weman, Helge; Fimland, Bjørn-Ove. (2012) De kan revolusjonere verdens datateknologi. Bergens Tidene [Internett]. 2012-12-02.
Interview

Weman, Helge; Fimland, Bjørn-Ove. (2012) De kan revolusjonere verdens datateknologi. Aftenposten [Avis]. 2012-12-02.
Interview

Weman, Helge; Fimland, Bjørn-Ove. (2012) NTNU-oppdagelse kan revolusjonere elektronikkbransjen. Adressa [Avis]. 2012-09-11.
Interview

Weman, Helge; Fimland, Bjørn-Ove. (2012) Nanohalvledere på grafen revolutionerer solcellers effektivitet. Ingenjøren [Avis]. 2012-10-20.

2011

Poster

Ahtapodov, Lyubomir; Kim, D.C.; Boe, A.B.; Choi, J.W.; Ji, H.; Kim, G. T.; Anthonysamy, Fervin Moses; Dasa Lakshmi Narayana, Dheeraj; Fimland, Bjørn-Ove; Weman, Helge. (2011) Photocurrent spectroscopy of single wurtzite GaAs nanowires. Heraeus seminar on III-V Nanowires . WE Heraeus Stiftung, Tysklland; Bad Honnef. 2011-02-21 - 2011-02-23.
Academic lecture

Ahtapodov, Lyubomir; Olk, Phillip; Todorovic, Jelena; Ericsson, M.; Dasa Lakshmi Narayana, Dheeraj; Van Helvoort, Antonius; Bergman, J.P.; Fimland, Bjørn-Ove; Weman, Helge. (2011) Optical properties of Wurtzite GaAs nanowires. GDR Semiconductor Nanowires and Nanotubes . CNRS; Porquerolles. 2011-10-17 - 2011-10-21.
Academic lecture

Ahtapodov, Lyubomir; Olk, Phillip; Todorovic, Jelena; Mjåland, Terje Sund; Dasa Lakshmi Narayana, Dheeraj; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2011) Optical characterization of single semiconductor nanowires. 6th NanoLab user meeting . NTNU NanoLab; Trondheim. 2011-11-16 - 2011-11-16.
Academic lecture

Ahtapodov, Lyubomir; Olk, Phillip; Todorovic, Jelena; Mjåland, Terje Sund; Eriksson, M.; Bergman, P; Dasa Lakshmi Narayana, Dheeraj; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2011) Combined studies of single Au-assisted GaAs/AlGaAs core/shell nanowires with PL spectroscopy and TEM. PDI Topical Workshop on MBE-grown Arsenide Nanowires ; Berlin. 2011-09-08 - 2011-09-09.
Academic lecture

Anthonysamy, Fervin Moses; Todorovic, Jelena; Dasa Lakshmi Narayana, Dheeraj; Olk, Phillip; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2011) Consecutive optical and structural characterization of a single heterostructured III-V semiconductor nanowire. 2nd Nano-network Workshop ; Oslo. 2011-06-15 - 2011-06-17.
Academic lecture

Anthonysamy, Fervin Moses; Todorovic, Jelena; karlberg, Thomas; Van Helvoort, Antonius; Dasa Lakshmi Narayana, Dheeraj; Olk, Phillip; Fimland, Bjørn-Ove; Weman, Helge. (2011) Consecutive Photoluminescence and Transmission Electron Microscopy Studies of Single GaAs/AlGaAs Core-shell Nanowires with a GaAsSb Insert. MRS Spring meeting 2011 . MRS; San Francisco. 2011-04-25 - 2011-04-29.
Academic lecture

Dasa Lakshmi Narayana, Dheeraj; Munshi, Abdul Mazid; DONG CHUL, KIM; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2011) Controlling crystal phases in GaAs nanowires grown by Au- and Ga-assisted MBE. PDI Topical Workshop on MBE-grown Arsenide Nanowires ; Berlin. 2011-09-08 - 2011-09-08.
Poster

DONG CHUL, KIM; Ahtapodov, Lyubomir; Boe, A.B.; Choi, J.W.; Kim, G. T.; Ji, H; Anthonysamy, Fervin Moses; Dasa Lakshmi Narayana, Dheeraj; Fimland, Bjørn-Ove; Weman, Helge. (2011) Photocurrent spectroscopy of single wurtzite GaAs nanowires. Heraeus seminar on III-V Nanowires ; Bad Honnef. 2011-02-21 - 2011-02-23.
Academic lecture

DONG CHUL, KIM; Christoffersen, Ole Morten; Munshi, Abdul Mazid; Dasa Lakshmi Narayana, Dheeraj; Ahtapodov, Lyubomir; Fimland, Bjørn-Ove; Weman, Helge. (2011) Nanofabrication of GaAs nanowire optoelectronic devices in NTNU NanoLab. 6th NanoLab user meeting . NTNU NanoLab; Trondheim. 2011-11-16 - 2011-11-16.
Academic lecture

Fauske, Vidar Tonaas; Munshi, Abdul Mazid; Dasa Lakshmi Narayana, Dheeraj; DONG CHUL, KIM; Fimland, Bjørn-Ove; Weman, Helge; Van Helvoort, Antonius. (2011) Cross-sectional Electron Microscopy characterization of the interface between GaAs Nanowires and a Si Substrate. 6th Nanolab usermeeting . NTNU Nanolab; Trondheim. 2011-11-16 - 2011-11-16.
Academic lecture

Kauko, Hanne; Grieb, Tim; Rosenauer, A.; Bjørge, Ruben; Munshi, Abdul Mazid; Weman, Helge; Van Helvoort, Antonius. (2011) Composition analysis of heterostructured GaAs nanowires with quantitative HAADF-STEM. 6th Nanolab usermeeting . NTNU Nanolab; Trondheim. 2011-11-16 - 2011-11-16.
Academic lecture

Munshi, Abdul Mazid; Dasa Lakshmi Narayana, Dheeraj; DONG CHUL, KIM; Todorovic, Jelena; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2011) Crystal phase and position control of self-catalyzed GaAs nanowires grown on a Si substrate. 6th NanoLab user meeting . NTNU NanoLab; Trondheim. 2011-11-16 - 2011-11-16.
Academic lecture

Munshi, Abdul Mazid; Dasa Lakshmi Narayana, Dheeraj; DONG CHUL, KIM; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2011) Periodic arrays of self-catalyzed heterostructured GaAs nanowires on Si substrates grown by molecular beam epitaxy. GDR Semiconductor Nanowires and Nanotubes . CNRS; Porquerolles. 2011-10-17 - 2011-10-21.
Poster

Munshi, Abdul Mazid; Dasa Lakshmi Narayana, Dheeraj; Todorovic, Jelena; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2011) Insights into Growth Mechanisms of Self-catalyzed GaAs Nanowires Grown by Molecular Beam Epitaxy. MRS Spring Meeting . MRS; San Francisco. 2011-04-25 - 2011-04-29.
Poster

Munshi, Abdul Mazid; Kim, D.C.; Dasa Lakshmi Narayana, Dheeraj; Todorovic, Jelena; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2011) Positioned self-catalyzed GaAs nanowire arrays on Si substrates grown by molecular beam epitaxy. Nano-network Workshop ; Oslo. 2011-06-15 - 2011-06-15.
Academic lecture

Olk, Phillip; Härtling, Thomas; DONG CHUL, KIM; Weman, Helge. (2011) All-optical contacting of single nanowires by confocal photodeposition of metal. Materials Res. Soc. 2011 Fall Meeting, Symposium BB: Functional Nanowires and Nanotubes . Materials Research Society; Boston. 2011-11-27 - 2011-12-02.
Poster

Olk, Phillip; Härtling, Thomas; DONG CHUL, KIM; Weman, Helge. (2011) Contacting single nanowires by confocal photodeposition of metal. GDR Nanofils 2011 . GDR Semiconductor Nanowires and Nanotubes; Porquerolles. 2011-10-17 - 2011-10-21.
Academic lecture

Todorovic, Jelena; Anthonysamy, Fervin Moses; Dasa Lakshmi Narayana, Dheeraj; Olk, Phillip; Fimland, Bjørn-Ove; Weman, Helge; Van Helvoort, Antonius. (2011) Correlated micro-photoluminescence and electron microscopy study of a heterostructured semiconductor nanowire. Microscopy of Semiconducting Materials 2011 (MSM XVII) . IoP; Cambridge. 2011-04-04 - 2011-04-04.
Academic lecture

Weigand, Christian Carl; Skåre, Daniel; Tveit, Johannes; Ladam, Cecile; Holmestad, Randi; Grepstad, Jostein; Weman, Helge. (2011) Growth of ZnO nanostructures on c- and a-plane sapphire by Au-assisted pulsed laser deposition. GDR Semiconductor Nanowires and Nanotubes . CNRS; Porquerolles. 2011-10-17 - 2011-10-21.
Popular scientific lecture

Weman, Helge. (2011) Guest seminar at KAIST: Nanotechnology at NTNU. NTNU-KAIST nanotechnology workshop . KAIST; Taejon. 2011-04-22 - 2011-04-22.
Popular scientific lecture

Weman, Helge. (2011) Guest seminar at Korea University: Nanotechnology at NTNU. Nanostudent excursion to Korea 2011 . Korea University; Seoul. 2011-04-26 - 2011-04-26.
Popular scientific lecture

Weman, Helge. (2011) Guest seminar at POSTECH: Nanotechnology at NTNU. Nanostudent excursion to Korea 2011 . Dept. of Physics, POSTECH; Pohang. 2011-04-21 - 2011-04-21.
Popular scientific lecture

Weman, Helge. (2011) Guest seminar at Seoul National University: Nanotechnology at NTNU. Nanostudent excursion to Korea 2011 . Seoul National University; Seoul. 2011-04-25 - 2011-04-25.
Popular scientific lecture

Weman, Helge. (2011) Guest seminar at Sungkyunkwan (Samsung) University: Nanotechnology at NTNU. Nanostudent excursion to Korea 2011 . Sungkyunkwan (Samsung) University; Suwon. 2011-04-27 - 2011-04-27.
Academic lecture

Weman, Helge. (2011) Invited seminar on "Heterostructured III-V nanowires grown byAu-assisted molecular beam epitaxy". Heraeus seminar on III-V Nanowires . WE Heraeus Stiftung, Tysklland; Bad Honnef. 2011-02-21 - 2011-02-23.
Academic lecture

Weman, Helge. (2011) Invited seminar: Heterostructured III-V nanowires grown by MBE. IBM seminar series . IBM Zurich Research Lab.; Rueschlikon. 2011-01-19 - 2011-01-19.
Academic lecture

Weman, Helge. (2011) Invited seminar: Heterostrucured III-V nanowires grown by Au- and self-assisted molecular beam epitaxy. PDI Topical Workshop on MBE-grown arsenide nanowires . PDI; Berlin. 2011-09-08 - 2011-09-09.
Academic lecture

Weman, Helge. (2011) Invited seminar: III-V nanowires for high-efficiency solar cells. Norway-China Workshop on Nanotechnology for renewable energy materials ; Trondheim. 2011-08-31 - 2011-09-01.
Academic lecture

Weman, Helge. (2011) Semiconductor nanowire based solar cells-A Nordic top-level research initiative. 24th Nordic semiconductor meeting ; Fuglsøcenter. 2011-06-19 - 2011-06-22.

2010

Poster

Ladam, C.; Weman, Helge; Vetaas Thomassen, M.; Weigand, Christian Carl; Røyset, Arne. (2010) Photoluminescence characterization of ZnO nanorods. Norwegian Electro-Optics meeting . NTNU; Ålesund. 2010-04-07 - 2010-04-09.
Poster

Ahtapodov, Lyubomir; Anthonysamy, Fervin Moses; Kim, D.C.; Olk, Phillip; Hoang, Thang Ba; Weman, Helge. (2010) The Nanophotonics Lab at NTNU: A Cool place for Small things with a Bright future. Norwegian Electro-Optics meeting . NTNU; Ålesund. 2010-04-07 - 2010-04-09.
Academic lecture

Ahtapodov, Lyubomir; Anthonysamy, Fervin Moses; Olk, Phillip; Kim, D.C.; Weman, Helge. (2010) The Nanophotonics Lab at NTNU: A Cool Place for Small Things with a Bright Future. 5th NanoLab user meeting . NTNU NanoLab; Trondheim. 2010-09-10 - 2010-09-10.
Academic lecture

Anthonysamy, Fervin Moses; Ahtapodov, Lyubomir; Hoang, Thang Ba; Dasa, Lakshmi Narayana; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2010) Micro-photoluminescence spectroscopy and imaging of single axial and radial heterostructured III-V nanowires. Norwegian electro-Optics meeting ; Ålesund. 2010-04-07 - 2010-04-09.
Academic lecture

Anthonysamy, Fervin Moses; Hoang, Thang Ba; Ahtapodov, Lyubomir; Dasa, Lakshmi Narayana; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2010) Engineering photoluminescence polarization in a single semiconductor nanowire. 5th NanoLab user meeting . NTNU NanoLab; Trondheim. 2010-09-10 - 2010-09-10.
Poster

Anthonysamy, Fervin Moses; Hoang, Thang Ba; Ahtapodov, Lyubomir; Dasa, Lakshmi Narayana; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2010) Photoluminescence polarization anisotropy in a single heterostructured III-V nanowire with mixed crystal phases. 30th International Conference on the Physics of Semiconductors (ICPS 2010) ; Seoul. 2010-07-25 - 2010-07-30.
Poster

Dasa, Lakshmi Narayana Dheeraj; Munshi, Abdul Mazid; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2010) Control of wurtzite and zinc blende crystal phases in single GaAs nanowires grown by Au-assisted molecular beam epitaxy. 5th Nanowire growth workshop ; Rome. 2010-11-04 - 2010-11-04.
Academic lecture

Dasa, Lakshmi Narayana; Munshi, Abdul Mazid; Fimland, Bjørn-Ove; Weman, Helge; Van Helvoort, Antonius. (2010) Controlling crystal phases in GaAs nanowires grown by Au-assisted molecular beam epitaxy. 5th nanowire growth workshop ; Rome. 2010-11-03 - 2010-11-05.
Academic lecture

Dasa, Lakshmi Narayana; Munshi, Abdul Mazid; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2010) Controlling crystal phases in GaAs nanowires grown by Au-assisted molecular beam epitaxy. 16th International Conference on Molecular Beam Epitaxy ; Berlin. 2010-08-22 - 2010-08-27.
Academic lecture

Dasa, Lakshmi Narayana; Munshi, Abdul Mazid; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2010) Tuning of the crystal phases in GaAs nanowires grown by Au-assisted molecular beam epitaxy. 5th NanoLab user meeting . NTNU NanoLab; Trondheim. 2010-09-10.
Academic lecture

Dasa, Lakshmi Narayana; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2010) Growth of heterostructured III-V semiconductor nanowires by molecular beam epitaxy. Nano-network workshop 2010 ; Tønsberg. 2010-05-31 - 2010-06-02.
Academic lecture

Dasa, Lakshmi Narayana; Zhou, Hailong; Anthonysamy, Fervin Moses; Hoang, Thang Ba; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2010) Growth of heterostructured III-V nanowires by molecular beam epitaxy for photonic applications. Photonics West . SPIE; San Francisco. 2010-01-23 - 2010-01-28.
Academic lecture

Dasa, Lakshmi Narayana; Zhou, Hailong; Anthonysamy, Fervin Moses; Hoang, Thang Ba; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2010) Tuning of the crystal phase in III-V nanowires grown by Au-assisted molecular beam epitaxy. MRS Spring meeting . MRS; San Fransisco. 2010-04-05 - 2010-04-05.
Poster

DONG CHUL, KIM; Ahtapodov, Lyubomir; Bø, A. B; Choi, J. W.; Ji, H.; Kim, G. T.; Moses, A. F.; Dheeraj, D.L.; Fimland, Bjørn-Ove; Weman, Helge. (2010) Photocurrent Spectroscopy of Single Wurtzite GaAs Nanowires. ICPS 2010 ; Seoul. 2010-07-25 - 2010-07-30.
Academic lecture

Furtak, T.E.; Baker, D.J.; Weigand, Christian Carl; Adamson, Jamie M.; Allen, C.G.; Yocom, A.E.; Patterson, L.S.; Weman, Helge; Ladam, C.; Olson, D.C.; Ginley, D.S.; Collins, R.T.. (2010) Surface Modification of Zinc Oxide Anodes in Organic Solar Cells. MRS Spring meeeting . Materials Research Society; San Francisco. 2010-04-05 - 2010-04-09.
Poster

Kim, D.C.; Ahtapodov, Lyubomir; Boe, A.B.; Choi, J.W.; Ji, H.; Kim, G.T.; Anthonysamy, Fervin Moses; Dasa, Lakshmi Narayana; Fimland, Bjørn-Ove; Weman, Helge. (2010) Photocurrent Spectroscopy of Single Wurtzite GaAs Nanowires. 30th International Conf. on the Physics of Semiconductors . Korea Physical Society; Seoul. 2010-07-25 - 2010-07-30.
Academic lecture

Svendsen, Guro Kristin; Weman, Helge; Skaar, Johannes. (2010) Modelling of reflection properties of nanowire lasers. Norwegian Electro-Optics Meeting 2010 ; Ålesund. 2010-04-07 - 2010-04-09.
Academic lecture

Weigand, Christian Carl; Baker, D.J.; Adamson, Jamie M.; Allen, C.G.; Bergren, M.R.; Steirer, K.X.; Olson, D.C.; Ladam, C.; Ginley, D.S.; Collins, R.T.; Furtak, T.E.; Weman, Helge. (2010) ZnO nanorod hybrid Organic/Inorganic Solar Cells and the effect of surface modifications. Renewable Energy Research Conference . NTNU; Trondheim. 2010-06-07 - 2010-06-10.
Poster

Weigand, Christian Carl; Grepstad, Jostein; Bergren, Matt; Weman, Helge; Furtak, Tom; Collins, Reuben; Fagerberg, Ragnar; Ladam, Cecile; Vullum, Per Erik; Dahl, Øystein; Tveit, Johannes. (2010) ZnO nanostructures grown by pulsed laser deposition. 1st Annual Workshop of the Norwegian PhD Network on Nanotechnology for Microsystems . Norwegian PhD Network on Nanotechnology for Microsystems; Tønsberg. 2010-05-31 - 2010-06-02.
Poster

Weigand, Christian Carl; Grepstad, Jostein; Weman, Helge; Ladam, C.; Vullum, Per Erik; Dahl, Øystein; Bergren, M.R.; Collins, R.T.; Furtak, T.E.; Tveit, Johannes; Holmestad, Randi. (2010) ZnO nanosheets grown by pulsed laser deposition. 5th Nanowire Growth Workshop ; Rome. 2010-11-03 - 2010-11-05.
Academic lecture

Weigand, Christian Carl; Ladam, C.; Bergren, Matt; Tveit, Johannes; Vullum, Per Erik; Dahl, Øystein; Fagerberg, Ragnar; Collins, R.T.; Furtak, T.E.; Grepstad, Jostein; Weman, Helge. (2010) ZnO nanostructures grown by pulsed laser deposition. 5th NTNU Nanolab Users Mtg. . NTNU NanoLab; Trondheim. 2010-09-10.
Academic lecture

Weman, Helge. (2010) Heterostructured III-V nanowires for photonic applications. Invited seminar Korea University, Seoul-Korea . Prof. Gyu Tae Kim, Korea University; Seoul. 2010-07-22 - 2010-07-22.
Academic lecture

Weman, Helge. (2010) Heterostructured III-V nanowires for photonic applications. Invited seminar Seoul National University, Korea . Prof. Yung Woo Park, Seoul National University; Seoul. 2010-07-21 - 2010-07-21.
Academic lecture

Weman, Helge. (2010) Heterostructured III-V nanowires for photonic applications. Invited seminar Samsung Electronics,Korea . Dr. Seo Sunae, Samsung Electronics; Suwon. 2010-07-23 - 2010-07-23.
Academic lecture

Weman, Helge. (2010) Heterostructured III-V nanowires with mixed crystal phases. Invited seminar University of California Los Angeles . UCLA; Los Angeles. 2010-01-29 - 2010-01-29.
Academic lecture

Weman, Helge. (2010) Heterostructured III-V nanowires with mixed crystal phases: New possibilities for bandstructure engineering. Invited seminar University of California San Diego . UCSD; San Diego. 2010-02-01 - 2010-02-01.
Academic lecture

Weman, Helge. (2010) Structural and optical properties of single III-V nanowires with different crystal phases. Invited seminar at NorPRINS workshop, Oslo . University of Oslo and IMEC, Belgium; Oslo. 2010-03-04 - 2010-03-05.

2009

Academic lecture

Røyset, Arne; Fagerberg, Ragnar; Weman, Helge. (2009) Cool, Small and Bright: cryogenic micro-photoluminescence for photovoltaic materials. Renewable Energy R&D-seminar, OPV2009: PV-materials . FFI; Oppdal. 2009-03-19 - 2009-03-21.
Academic lecture

Anthonysamy, Fervin Moses; Hoang, Thang Ba; Dasa, Lakshmi Narayana; Zhou, Hailong; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2009) Micro-photoluminescence study of single GaAsSb/GaAs radial and axial heterostructured core-shell nanowires. E-MRS 2009 . MRS; Strasbourg. 2009-06-08 - 2009-06-12.
Academic lecture

Anthonysamy, Fervin Moses; Hoang, Thang Ba; Dasa, Lakshmi Narayana; Zhou, Hailong; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2009) Optical properties of axial and radial heterostructured III-V semiconductor nanowires. 4th NTNU Nanolab User Meeting . NTNU Nanolab; Trondheim. 2009-05-13.
Academic lecture

Dasa, Lakshmi Narayana; Hoang, Thang Ba; Anthonysamy, Fervin Moses; Zhou, Hailong; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2009) Heterostructured III-V Nanowires with Mixed Crystal Phases: New Possibilities for Heterostructure Engineering. Nordic Semiconductor Meeting ; Reykjavik. 2009-06-14 - 2009-06-17.
Poster

Dasa, Lakshmi Narayana; Patriarche, G; Van Helvoort, Antonius; Zhou, Hailong; Fimland, Bjørn-Ove; Weman, Helge. (2009) Growth and structural characterization of axial heterostructured GaAs/GaSb nanowires grown by molecular beam epitaxy. 3rd International conf. on One-dimensional Nanomaterials . Georgia Tech., Atlanta; Atlanta. 2009-12-07 - 2009-12-09.
Poster

Dasa, Lakshmi Narayana; Rogstad, Espen; Scheffler, Martha; Van Helvoort, Antonius; Zhou, Hailong; Patriarche, G.; Harmand, J.C.; Fimland, Bjørn-Ove; Weman, Helge. (2009) Diffusion-limited growth of GaAs nanowires by Au-assisted molecular beam epitaxy. 4th GDR meeting ; Autrans. 2009-06-30 - 2009-07-03.
Poster

Dasa, Lakshmi Narayana; Van Helvoort, Antonius; Anthonysamy, Fervin Moses; Zhou, Hailong; Hoang, Thang Ba; Fimland, Bjørn-Ove; Weman, Helge. (2009) Effect of growth-interruption on structural and optical properties of GaAs/GaAsSb axial heterostructured nanowires. Materials Res. Soc. 2009 Fall Meeting, Symposium M: Multifunction at the Nanoscale through Nanowires . Materials Research Society; Boston. 2009-11-29 - 2009-12-04.
Poster

Dasa, Lakshmi Narayana; Van Helvoort, Antonius; Anthonysamy, Fervin Moses; Zhou, Hailong; Hoang, Thang Ba; Fimland, Bjørn-Ove; Weman, Helge. (2009) Optimization of heterointerfaces in axial heterostructured nanowires grown by molecular beam epitaxy. 4th Nanowire growth workshop . CNRS; Paris. 2009-10-26 - 2009-10-27.
Academic lecture

Dasa, Lakshmi Narayana; Van Helvoort, Antonius; Zhou, Hailong; Anthonysamy, Fervin Moses; Hoang, Thang Ba; Rogstad, Espen; Scheffler, Martha; Fimland, Bjørn-Ove; Weman, Helge. (2009) Tailoring of semiconductor heterostructure nanowires for photonic applications by molecular beam epitaxy. 4th NTNU Nanolab User Meeting . NTNU Nanolab; Trondheim. 2009-05-13.
Academic lecture

Hoang, Thang Ba; Anthonysamy, Fervin Moses; Zhou, Hailong; Dasa, Lakshmi Narayana; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2009) Crystal phase dependent photoluminescence polarization in single semiconductor nanowires. 3rd International conf. on One-dimensional Nanomaterials . Georgia Tech., Atlanta; Atlanta. 2009-12-07 - 2009-12-09.
Academic lecture

Hoang, Thang Ba; Anthonysamy, Fervin Moses; Zhou, Hailong; Dasa, Lakshmi Narayana; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge. (2009) Polarized micro-photoluminescence imaging of single GaAs/AlGaAs core-shell nanowires with GaAsSb inserts. Materials Res. Soc. 2009 Fall Meeting, Symposium O: Excitons and Plasmon Resonances in Nanostructures II

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Helge Weman

Helge Weman

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My research area: Nanophotonic Materials and Devices

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