Structural and electrical anisotropies of Si-doped a-plane (11-20) GaN films with different SiNx interlayers

Ji Hoon Kim, Sung Min Hwang, Yong Gon Seo, Kwang Hyeon Baik, Jung Ho Park

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

The effects of different SiNx interlayers on the structural and electrical properties of nonpolar Si-doped a-plane (11-20) GaN films grown on r-plane (1-102) sapphire were investigated. The surface roughness depends strongly on the SiNx coverage, deposition temperature and number of SiNx layers. The in-plane anisotropy of on-axis x-ray rocking curves (XRCs) (full width at half-maximum) was significantly decreased by the introduction of multiple SiNx-treated GaN interlayers, indicating coherently scattering domains of uniform size. Off-axis XRC measurements were also employed to investigate the effects on the mosaic twist corresponding to edge dislocation and the I1-type basal-plane stacking fault (BSF) density. Hall effect measurement showed that the electrical conductivity was the highest when multiple SiNx/GaN interlayers were employed. The measured sheet resistances (Rsh) along the c-axis were higher than those along the m-axis. These anisotropic conductivities could be explained by BSFs acting as carrier scattering centers. The ratios of Rsh along the two in-plane orientations also correlated well with the BSF densities.

Original languageEnglish
Article number085007
JournalSemiconductor Science and Technology
Volume28
Issue number8
DOIs
Publication statusPublished - 2013 Aug

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering
  • Materials Chemistry

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