Electronic structures of polar and nonpolar GaN surfaces

M. H. Tsai, O. F. Sankey, Kevin Schmidt, I. S T Tsong

Research output: Contribution to journalArticle

32 Scopus citations

Abstract

GaN has a large ionicity. The polarity of its surface may have a substantial influence on its electronic structure, in particular its work function. Our first-principles calculations for several polar and nonpolar surfaces suggest that the polar surfaces are semimetallic, while the nonpolar surfaces are semiconducting. The polar surfaces have an array of dipole layers that result in a substantial increase or decrease of the work function depending on whether the surface is terminated by the N or Ga layer. The nonpolar surfaces have tilted surface N-Ga bonds, which result in an outward dipole layer that increases the work function.

Original languageEnglish (US)
Pages (from-to)40-46
Number of pages7
JournalMaterials Science and Engineering B: Solid-State Materials for Advanced Technology
Volume88
Issue number1
DOIs
StatePublished - Jan 2 2002

Keywords

  • Dipole layer
  • Electronic structure
  • GaN

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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