Morphology and Polarity of GaN Single Crystals Synthesized by the Na Flux Method

Masato Aoki, Hisanori Yamane, Masahiko Shimada, Takashi Kajiwara, Seiji Sarayama, Francis J. DiSalvo

Research output: Contribution to journalArticlepeer-review

36 Citations (Scopus)


The correlation between morphology and polarity was investigated for GaN single crystals synthesized by the Na flux method. The polarity was identified by using anomalous X-ray dispersion. Colorless transparent prismatic single crystals were classified into three types. The first had a smooth basal plane face and no hexagonal pyramidal faces, the second had smooth pyramidal faces, and the third had a rough basal plane face and rough pyramidal faces. The prismatic crystals with smooth surfaces had N-polarity and grew in the -c direction, whereas the crystals having rough surfaces had Ga-polarity and grew in the +c direction. In colorless transparent platelet single crystals, one side of the basal planes had a mirror smooth surface, while the other side had many step edges and hexagonal pits. The smooth basal plane and the rough basal plane were the (0001) N-face and (0001) Ga-face, respectively. Black pyramidal crystals had a smooth (0001) basal plane face corresponding to the Ga-face.

Original languageEnglish
Pages (from-to)55-58
Number of pages4
JournalCrystal Growth and Design
Issue number1
Publication statusPublished - 2002 Jan

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics


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