Carrier localization and related photoluminescence in cubic AlGaN epilayers

R. E. L. Powell, S. V. Novikov, F. Luckert, P. R. Edwards, A. V. Akimov, C. T. Foxon, R. W. Martin, A. J. Kent

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Abstract

The steady state and time-resolved photoluminescence (PL) spectra of cubic AlxGa1-xN have been measured for 0 < x < 1. The intensity of the room temperature PL increases by an order of magnitude when the AlN content increases from x = 0 to x = 0.95. Additionally, the PL decay slows down with the decrease of temperature and increase of x. These results show that strong localization of carriers on alloy composition fluctuations plays a large role in determining the intensity and temporal evolution of the PL. The activation energy for the localized carriers increases with the increase of x and reaches the value of 55 meV at x = 0.95.
Original languageEnglish
Article number063517
Number of pages6
JournalJournal of Applied Physics
Volume110
Issue number6
DOIs
Publication statusPublished - 15 Sep 2011

Keywords

  • solid-solutions
  • alloys
  • epilayers
  • spectra

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