Absolute surface energies of oxygen-adsorbed GaN surfaces

Takahiro Kawamura, Toru Akiyama, Akira Kitamoto, Masayuki Imanishi, Masashi Yoshimura, Yusuke Mori, Yoshitada Morikawa, Yoshihiro Kangawa, Koichi Kakimoto

Research output: Contribution to journalArticlepeer-review

Abstract

Absolute surface energies of reconstructed polar, nonpolar, and semi-polar GaN surfaces formed under oxide vapor phase epitaxy (OVPE) growth conditions were investigated via first-principles calculations. The relationships of stable surface orientations and surface structures with the growth conditions of Ga pressure and temperature were examined in terms of absolute surface energies. The stability of the surface orientation was in the order (0 0 0 1¯), (1 1¯ 0 1), (1 1¯ 0 0), (1 1 2¯ 0), (0 0 0 1), and (1 1¯ 0 1¯). High O concentrations on OVPE-grown GaN could be explained in relation to the stability of the (1 1¯ 0 1) surface. The stable (1 1¯ 0 1) surface consisted of N vacancies and H and O adatoms. Therefore, it was deduced that its appearance results in increased O impurity incorporation.

Original languageEnglish
Article number125868
JournalJournal of Crystal Growth
Volume549
DOIs
Publication statusPublished - Nov 1 2020

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Inorganic Chemistry
  • Materials Chemistry

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