Fabrication of cubic and hexagonal GaN micro-crystals on GaAs(0 0 1) substrates with relatively thin low-temperature GaN buffer layer

Ryuji Katayama, Kentaro Onabe

Research output: Contribution to journalConference article

3 Citations (Scopus)

Abstract

Predominantly cubic phase GaN (c-GaN) micro-crystals have been fabricated on GaAs substrates by radio-frequency plasma-assisted molecular beam epitaxy (RF-MBE) using relatively thin low-temperature-grown GaN buffer layer, which promotes the generation of Ga droplets acting as the nuclei for the three-dimensional (3D) growth. These crystals were found to be highly luminescent, and their optical quality was much better than that of the two-dimensionally (2D) grown c-GaN region as investigated by micro-cathodoluminescence (micro-CL). Micro-Raman analysis revealed that there is an apparent difference in the structural perfection between micro-crystals and the 2D grown region. These results suggest that defects or local strain, originating from the large difference in lattice constants and thermal expansion coefficients between GaN and GaAs, could be avoided by the transition from 2D to 3D growth mode with the use of this nucleation process, as is the case with a droplet epitaxy technique.

Original languageEnglish
Pages (from-to)431-436
Number of pages6
JournalJournal of Crystal Growth
Volume278
Issue number1-4
DOIs
Publication statusPublished - 2005 May 1
Event13th International Conference on Molecular Beam Epitaxy -
Duration: 2004 Aug 222004 Aug 27

Keywords

  • A1. Cathodo-luminescence
  • A1. Photoluminescence
  • A1. Raman scattering
  • A3. Molecular beam epitaxy
  • B1. Gallium Nitride
  • B2. Semiconducting III-V materials

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Inorganic Chemistry
  • Materials Chemistry

Fingerprint Dive into the research topics of 'Fabrication of cubic and hexagonal GaN micro-crystals on GaAs(0 0 1) substrates with relatively thin low-temperature GaN buffer layer'. Together they form a unique fingerprint.

  • Cite this