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

Yuji Masubuchi, Ryohei Yamaoka, Teruki Motohashi, Kazuhiko Kirihara, Woong Lee, Kentaro Watanabe, Takashi Sekiguchi, Shinichi Kikkawa

Research output: Contribution to journalArticle

8 Citations (Scopus)

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 °C but they did not grow in the lateral direction. When the growth temperature was increased above 900 °C, 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 °C exhibited strong blue emission at 2.69 eV along with weak band-edge emission at 3.39 eV, similar to those of GaN. The latter emission was intense for nanowires grown at 1000 °C, which had an improved crystallinity and a higher nitride/oxide ion ratio. Nanowires grown at 750 and 900 °C exhibited persistent photoconductivity under UV irradiation at 393 nm.

Original languageEnglish
Pages (from-to)87-92
Number of pages6
JournalJournal of Crystal Growth
Volume337
Issue number1
DOIs
Publication statusPublished - 2011 Dec 15
Externally publishedYes

Keywords

  • A2. Growth from vapor
  • A2. Seed crystals
  • B1. Gallium compounds
  • B1. Nanomaterials
  • B1. Oxynitride

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Inorganic Chemistry
  • Materials Chemistry

Fingerprint Dive into the research topics of 'Crystal growth and characterization of gallium oxynitride nanowires grown on seed crystals'. Together they form a unique fingerprint.

  • Cite this

    Masubuchi, Y., Yamaoka, R., Motohashi, T., Kirihara, K., Lee, W., Watanabe, K., Sekiguchi, T., & Kikkawa, S. (2011). Crystal growth and characterization of gallium oxynitride nanowires grown on seed crystals. Journal of Crystal Growth, 337(1), 87-92. https://doi.org/10.1016/j.jcrysgro.2011.10.008