Modelling of the defect structure in GaN MOCVD thin films by X-ray diffraction

F. Huet, M. A. Di Forte-Poisson, A. Romann, M. Tordjman, J. Di Persio, B. Pecz

Research output: Contribution to journalConference article

5 Citations (Scopus)

Abstract

We report on material properties of GaN thin films grown on (0001) exactly oriented sapphire substrates by MOCVD. The crystalline quality of the samples was estimated by several techniques: Nomarski microscopy, transmission electron microscopy (TEM) and high resolution X-ray diffraction (HRXRD). It is shown that a quantitative evaluation of defects (dislocations) in GaN, can be obtained using a model developed by Hordon and Averbach (M.J. Hordon, B.L. Averbach, Act. Met. 9 (1961) 237-246) and based on X-ray peaks Full Width at Half Maximum (FWHM) measurements. For each sample, more than ten Bragg reflections, symmetrical and asymmetrical, were investigated. The analysis clearly illustrates that gradations in the crystalline qualities of GaN epilayers can be well evidenced and quantified by this method. The reasonable self-consistency of the results allows to approach an estimation of dislocation content and arrangement.

Original languageEnglish
Pages (from-to)198-201
Number of pages4
JournalMaterials Science and Engineering B: Solid-State Materials for Advanced Technology
Volume59
Issue number1-3
DOIs
Publication statusPublished - May 6 1999
EventProceedings of the 1998 Symposium L: on Nitrides and Related Wide Band Gap Materials (E-MRS Meeting) - Strasbourg
Duration: Jun 16 1998Jun 19 1998

ASJC Scopus subject areas

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

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