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Growth of wurtzite GaP in InP/GaP core-shell nanowires by selective-area MOVPE

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Title: Growth of wurtzite GaP in InP/GaP core-shell nanowires by selective-area MOVPE
Authors: Ishizaka, Fumiya Browse this author
Hiraya, Yoshihiro Browse this author
Tomioka, Katsuhiro Browse this author →KAKEN DB
Fukui, Takashi Browse this author →KAKEN DB
Keywords: Nanostructures
Metalorganic vapor phase epitaxy
Selective epitaxy
Nanomaterials
Semiconducting III-V materials
Issue Date: 1-Feb-2015
Publisher: Elsevier
Journal Title: Journal of crystal growth
Volume: 411
Start Page: 71
End Page: 75
Publisher DOI: 10.1016/j.jcrysgro.2014.10.024
Abstract: A GaP nanowire is promising from the viewpoint of device applications because when its crystal phase is changed from zinc blende (ZB) to wurtzite (WZ), its band gap changes from indirect to direct. GaP in the WZ phase is theoretically and experimentally shown to have the possibility of "green" emission. Here we report on the growth of WZ GaP in InP/GaP core-shell nanowires by selective-area metal-organic vapor-phase epitaxy (SA-MOVPE). WZ InP nanowires were used as a template for transferring the WZ structure to GaP. Transmission electron microscopy revealed that WZ GaP was grown on the sidewalls of the InP core in the lateral <-2 1 1 > direction and that ZB GaP was grown on the top of the le core in the axial < 1 1 1 > A direction. A growth model for the different crystal structures of the GaP shell is proposed from the viewpoint of the growth direction. The WZ structure is "transferred" from the InP core to the GaP shell only when GaP grows in the direction perpendicular to the WZ stacking direction of the InP core. This so-called "crystal structure transfer" can also be applied to p- and n-doped GaP and is therefore promising for fabricating WZ-GaP-basecl light-emitting diodes. (C) 2014 Elsevier B.V. All rights reserved.
Type: article (author version)
URI: http://hdl.handle.net/2115/57932
Appears in Collections:情報科学院・情報科学研究院 (Graduate School of Information Science and Technology / Faculty of Information Science and Technology) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 福井 孝志

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