Excitonic localization in AlN-rich AlxGa1-xN/AlyGa1-yN multi-quantum-well grain boundaries

Idris A. Ajia, P. R. Edwards, Z. Liu, J. C. Yan, R. W. Martin, I. S. Roqan

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Abstract

AlGaN/AlGaN multi-quantum-wells (MQW) with AlN-rich grains have been grown by metal organic chemical vapor deposition. The grains are observed to have strong excitonic localization characteristics that are affected by their sizes. The tendency to confine excitons progressively intensifies with increasing grain boundary area. Photoluminescence results indicate that the MQW have a dominant effect on the peak energy of the near-bandedge emission at temperatures below 150 K, with the localization properties of the grains becoming evident beyond 150 K. Cathodoluminescence maps reveal that the grain boundary has no effect on the peak intensities of the AlGaN/AlGaN samples.
Original languageEnglish
Article number122111
Number of pages5
JournalApplied Physics Letters
Volume105
Issue number12
Early online date25 Sep 2014
DOIs
Publication statusPublished - Sep 2014

Keywords

  • multi-quantum-wells
  • MQW
  • AlN-rich grains
  • excitonic localization
  • AlGaN/AlGaN MQW

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