Heteroepitaxy of gallium nitride on (0001), (1012) and (1010) sapphire surfaces

Jin Soo Hwang, Alexander V. Kuznetsov, Sun Sook Lee, Hyang Sook Kim, Joong Gill Choi, Paul Joe Chong

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

The structure, surface morphology and photoluminescence properties for the undoped GaN films grown on the (0001), (1012) and (1010) α-Al2O3 substrates have been investigated using the halide vapor phase epitaxy (HVPE) method with the Ga/HCl/NH3/He system. X-ray diffratometer (XRD), reflection high energy electron diffraction (RHEED) and scanning electron microscopy (SEM) are used for the study of the structure and surface morphology of the film. The luminescence property is assessed by photoluminescence (PL) measurement at room temperature. The following orientation relationships are observed; (0001) GaN/(0001) Al2O3, (1120) GaN/(1012) Al2O3, and (1013) and (1212) GaN/(1010) Al2O3. The (1013) GaN films possess two types of surface morphology depending upon the growth conditions. A possible reason for this phenomenon is discussed. The optimum growth conditions of the GaN films for each orientation are established. The qualities of the films showing different orientations are compared. For the (1013) GaN films, it is observed that the higher the growth temperature, the better the crystal structure and the smoother the surface morphology. The relative intensities of (1212) and (1013) films grown at higher temperature are much lower by several ten times than those of (0001), (1120) and (1013) GaN film grown at lower temperature.

Original languageEnglish
Pages (from-to)5-14
Number of pages10
JournalJournal of Crystal Growth
Volume142
Issue number1-2
DOIs
Publication statusPublished - 1994 Sep 1

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Inorganic Chemistry
  • Materials Chemistry

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