Excitonic transitions in MBE grown h-GaN with cubic inclusions

Stefan Strauf, Peter Michler, Jürgen Gutowski, Hartmut Selke, Udo Birkle, Sven Einfeldt, Detlef Hommel

Research output: Contribution to journalArticlepeer-review

Abstract

Undoped and magnesium doped MBE grown GaN epilayers on sapphire substrates show a particular variety of near-bandgap luminescent transitions. Despite the large lattice mismatch to the substrate, pronounced free- and bound-exciton transitions allow for an estimation of the excitonic binding energies. For the given thickness range (about 1 μm), we find an almost strain-relaxed situation with the main exciton transition energies well corresponding to the bulk values. On their low-energy side, we identify lines having been tentatively assigned to stacking fault excitons, and interface-related exciton transitions correlated to extended defects and/or dislocations in this spatial region. Evidence of cubic inclusions of a size up to 500 nm is doubtless given by observing sharp C-GaN related donor-bound exciton emission and respective structures in transmission electron microscope investigations.

Original languageEnglish
Pages (from-to)682-686
Number of pages5
JournalJournal of Crystal Growth
Volume189-190
DOIs
StatePublished - Jun 15 1998

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Inorganic Chemistry
  • Materials Chemistry

Keywords

  • Cubic inclusions
  • Dislocations
  • Excitons in wurtzite GaN

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