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Effects of the V/III ratio on a-plane GaN epitaxial layer on r-plane sapphire grown by HVPE

  • Journal of the Korean Crystal Growth and Crystal Technology
  • Abbr : J. Korean Cryst. Growth Cryst. Technol.
  • 2014, 24(3), pp.89~93
  • DOI : 10.6111/JKCGCT.2014.24.3.089
  • Publisher : The Korea Association Of Crystal Growth, Inc.
  • Research Area : Engineering > Materials Science and Engineering

하주영 1,  Mi-Seon Park 1,  Won-Jae Lee 1,  Young Jun Choi 2,  Hae Yong Lee 2

1동의대학교
2(주)루미지엔테크

Accredited

ABSTRACT

In this study, effects of the V/III ratio on a-plane GaN epitaxial on r-plane grown by HVPE have beeninvestigated. According to increasing of V/III ratio, the value of FWHM of a-plane (11-20) GaN and the value of surfaceroughness (Ra) were decreased. Growth rate of a-plane GaN epitaxial layer were increased until V/III ratio = 7 as theincreasing of V/III ratio, but it was reduced at V/III ratio = 10. At V/III ratio = 10, the FWHM of a-plane (11-20) GaN RCand the surface roughness (Ra) were 829 arcsec and 1.58 nm, respectively, as the lowest value in this study. Also for V/IIIratio = 10, cracks under surface or voids were observed the lowest values in images of optical microscope. An M-shapedazimuthal dependence over 360oangle range was observed for all samples. At V/III ratio = 10, the difference of FWHM ofa-plane GaN between 0oand 90owas 439 arcsec revealed as the lowest value in the 4 samples.

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