Dislocation defects in GaN epilayers grown on Si (100) substrates by metal-organic chemical-vapor deposition

Young S. Park, Y. H. Kwon, I. M. Hyunsik, Woong Jung, Hyungsang Kim, Minseon Kim, W. C. Yang, Junho Lee, Hong Goo Choi, Cheong Hyun Roh, Cheol Koo Hahn

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3 Scopus citations

Abstract

Dislocation defects in GaN epilayers grown on Si substrates were investigated using cathodoluminescence (CL) and atomic force microscopy (AFM). The dislocation densities of the films were deduced from two-dimensional CL image measurements and ranged from 1 x 1011 cm-2 to 5 x 1011 cm-2. These values are larger than those reported for GaN epilayers grown on sapphire substrates. The surface morphology and dislocations in the GaN epilayers were investigated by using AFM. From a comparative study of the CL and the AFM measurements, the GaN epilayers with lower dislocation densities are seen to have good surface morphologies with smaller densities of surface defects.

Original languageEnglish
Pages (from-to)1172-1175
Number of pages4
JournalJournal of the Korean Physical Society
Volume56
Issue number4
DOIs
StatePublished - 15 Apr 2010

Keywords

  • Cathodoluminescence
  • Dislocation defects
  • Gan

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