Cathodoluminescence study of micro-crack-induced stress relief for AlN films on Si(111)

G. Sarusi, O. Moshe, S. Khatsevich, D. H. Rich, J. Salzman, B. Meyler, M. Shandalov, Y. Golan

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

Spatially, spectrally, and depth-resolved cathodoluminescence (CL) measurements were performed for high-quality thin AlN films grown on Si(111). CL spectra exhibited a sharp peak at 5.960 eV, corresponding to the near-band-edge excitonic emission of AlN. Depth-resolved CL analysis showed that deep level oxygen and carbon impurities are localized primarily at the AlN/Si interface and AlN outer surface. Monochromatic CL imaging of the near-band-edge emission exhibits a spotty pattern, which corresponds to high concentrations of threading dislocations and thermally induced microcracks in the thin layers. We have examined relief of the thermal stress in close proximity to single microcracks and intersecting microcracks. Local CL spectra acquired with a focused e-beam show blue-shifts as large as ∼82 meV in the AlN near-band edge excitonic peaks, reflecting defect-induced reductions in the biaxial thermal stress, which has a maximum value of ∼47 kbar.

Original languageEnglish
Pages (from-to)L15-L19
JournalJournal of Electronic Materials
Volume35
Issue number12
DOIs
StatePublished - 1 Dec 2006

Keywords

  • AlN/Si heterostructures
  • Cathodoluminescence
  • III-nitride thin films
  • Micro-cracks
  • Thermal stress

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering
  • Materials Chemistry

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