Blar i Institutt for elektroniske systemer på forfatter "Van Helvoort, Antonius"
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Determination of GaAs zinc blende/wurtzite band offsets utilizing GaAs nanowires with an axial GaAsSb insert
Ahtapodov, Lyubomir; Kauko, H; Munshi, A Mazid; Fimland, Bjørn-Ove; Van Helvoort, Antonius; Weman, Helge (Journal article; Peer reviewed, 2017)By applying a correlated micro-photoluminescence spectroscopy and transmission electron microscopy (TEM) approach, we have utilized molecular beam epitaxy grown self-catalysed GaAs nanowires (NWs) with an axial GaAsSb ... -
Epitaxially grown III-arsenide-antimonide nanowires for optoelectronic applications
Ren, Dingding; Ahtapodov, Lyubomir; Van Helvoort, Antonius; Weman, Helge; Fimland, Bjørn-Ove (Journal article; Peer reviewed, 2019)Epitaxially grown ternary III-arsenide-antimonide (III-As–Sb) nanowires (NWs) are increasingly attracting attention due to their feasibility as a platform for the integration of largely lattice-mismatched antimonide-based ... -
Focused ion beam lithography for position-controlled nanowire growth
Mosberg, Aleksander Buseth; Ren, Dingding; Ahtapodov, Lyubomir; Weman, Helge; Fimland, Bjørn Ove Myking; Van Helvoort, Antonius (Peer reviewed; Journal article, 2023) -
Growth study of self-assembled GaN nanocolumns on silica glass by plasma assisted molecular beam epitaxy
Liudi Mulyo, Andreas; Konno, Yuta; Nilsen, Julie Stene; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge; Kishino, Katsumi (Journal article; Peer reviewed, 2017)We demonstrate GaN nanocolumn growth on fused silica glass by plasma-assisted molecular beam epitaxy. The effect of the substrate temperature, Ga flux and N2 flow rate on the structural and optical properties are studied. ... -
Origin of Leakage Currents and Nanowire-to-Nanowire Inhomogeneity in Radial p-i-n Junction GaAs Nanowire Array Solar Cells on Si
Mukherjee, Anjan; Ren, Dingding; Mosberg, Aleksander Buseth; Vullum, Per Erik; Van Helvoort, Antonius; Fimland, Bjørn Ove Myking; Weman, Helge (Journal article; Peer reviewed, 2023)To realize the promising potential of radial junction nanowire (NW) array-based solar cells, it is crucial to get physical insight into how the overall photoconversion efficiency (PCE) is impacted by the hole mask properties, ... -
Selective area growth of AlGaN nanopyramid arrays on graphene by metal-organic vapor phase epitaxy
Munshi, A Mazid; Kim, Dong-Chul; Heimdal, Carl Philip J; Heilmann, Martin; Christiansen, Silke; Vullum, Per Erik; Van Helvoort, Antonius; Weman, Helge (Journal article; Peer reviewed, 2018)Wide-bandgap group III-nitride semiconductors are of special interest for applications in ultraviolet light emitting diodes, photodetectors, and lasers. However, epitaxial growth of high-quality III-nitride semiconductors ... -
Single-Mode Near-Infrared Lasing in a GaAsSb-Based Nanowire Superlattice at Room Temperature
Ren, Dingding; Ahtapodov, Lyubomir; Nilsen, Julie Stene; Yang, Jianfeng; Gustafsson, Anders; Huh, Junghwan; Conibeer, G; Van Helvoort, Antonius; Fimland, Bjørn-Ove; Weman, Helge (Journal article; Peer reviewed, 2018)Semiconductor nanowire lasers can produce guided coherent light emission with miniaturized geometry, bringing about new possibilities for a variety of applications including nanophotonic circuits, optical sensing, and ... -
Unsupervised machine learning applied to scanning precession electron diffraction data
Martineau, B. H.; Johnstone, D.N.; Van Helvoort, Antonius; Midgley, Paul A.; eggeman, A.S (Journal article; Peer reviewed, 2019)Scanning precession electron diffraction involves the acquisition of a two-dimensional precession electron diffraction pattern at every probe position in a two-dimensional scan. The data typically comprise many more ... -
Using FIB-SEM as a Platform for the Positioning and Correlated Characterization of III-V Nanowires
Mosberg, Aleksander Buseth; Ren, Dingding; Fauske, Vidar Tonaas; Fimland, Bjørn-Ove; Van Helvoort, Antonius (Journal article; Peer reviewed, 2018)