Low-energy electron-excited nanoluminescence studies of GaN and related materials

L. J. Brillson, S. T. Bradley, S. H. Goss, X. Sun, M. J. Murphy, W. J. Schaff, L. F. Eastman, D. C. Look, R. J. Molnar, Fernando Ponce, N. Ikeo, Y. Sakai

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

We have used low-energy electron-excited nanoluminescence (LEEN) spectroscopy combined with ultrahigh vacuum surface analysis techniques to obtain electronic bandgap, confined state and deep-level trap information from III nitride compound semiconductor surfaces and their buried interfaces on a nanometer scale. Localized states are evident at GaN/InGaN quantum wells, GaN ultrathin films, AlGaN/GaN pseudomorphic heterostructures, and GaN/Al2O3 interfaces that are sensitive to the chemical composition, bonding and atomic structure near interfaces, and in turn to the specifics of the epitaxial growth process. Identification of electrically active defects in these multilayer nanostructures provides information to optimize interface growth and control local electronic properties.

Original languageEnglish (US)
Pages (from-to)498-507
Number of pages10
JournalApplied Surface Science
Volume190
Issue number1-4
DOIs
StatePublished - May 8 2002

Keywords

  • AlGaN
  • AlO
  • Defects
  • GaN
  • Heterojunctions
  • InGaN
  • L uminescence spectroscopy
  • Semiconductor interfaces

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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    Brillson, L. J., Bradley, S. T., Goss, S. H., Sun, X., Murphy, M. J., Schaff, W. J., Eastman, L. F., Look, D. C., Molnar, R. J., Ponce, F., Ikeo, N., & Sakai, Y. (2002). Low-energy electron-excited nanoluminescence studies of GaN and related materials. Applied Surface Science, 190(1-4), 498-507. https://doi.org/10.1016/S0169-4332(01)00925-4