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Crystal growth and characterization of gallium oxynitride nanowires grown on seed crystals

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Title: Crystal growth and characterization of gallium oxynitride nanowires grown on seed crystals
Authors: Masubuchi, Yuji Browse this author →KAKEN DB
Yamaoka, Ryohei Browse this author
Motohashi, Teruki Browse this author
Kirihara, Kazuhiko Browse this author
Lee, Woong Browse this author
Watanabe, Kentaro Browse this author
Sekiguchi, Takashi Browse this author
Kikkawa, Shinichi Browse this author
Keywords: Growth from vapor
Seed crystals
Gallium compounds
Nanomaterials
Oxynitride
Issue Date: 15-Dec-2011
Publisher: Elsevier B.V.
Journal Title: Journal of Crystal Growth
Volume: 337
Issue: 1
Start Page: 87
End Page: 92
Publisher DOI: 10.1016/j.jcrysgro.2011.10.008
Abstract: Nanowires of gallium oxynitride with wurtzite type structure were grown using seed crystals obtained by ammonia nitridation of an amorphous gallium oxide precursor containing 3 at% nickel additive. The seed crystals on a silica substrate were annealed with the amorphous gallium oxide precursor under ammonia flow to grow gallium oxynitride nanowires. The nanowires grew to lengths of about 150 μm along the seed crystals parallel to the hexagonal c-plane at 750 and 800℃ but they did not grow in the lateral direction. When the growth temperature was increased above 900℃, the growth direction gradually changed to become parallel with the c-axis with a copresenting of gallium-nitride-like crystals. Room-temperature cathodoluminescence spectra of nanowires grown at 800℃ exhibited strong blue emission at 2.69 eV along with weak band-edge emission at 3.39 eV, similar to GaN. The latter emission was intense for nanowires grown at 1000℃, which had an improved crystallinity and a higher nitride/oxide ion ratio. Nanowires grown at 750 and 900℃ exhibited persistent photoconductivity under UV irradiation at 393 nm.
Type: article (author version)
URI: http://hdl.handle.net/2115/48131
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 鱒渕 友治

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