Evidence for Two Mg Related Acceptors in GaN

B. Monemar, P. P. Paskov, G. Pozina, C. Hemmingsson, J. P. Bergman, T. Kawashima, H. Amano, I. Akasaki, T. Paskova, S. Figge, D. Hommel, and A. Usui
Phys. Rev. Lett. 102, 235501 – Published 9 June 2009

Abstract

The optical signatures of Mg-related acceptors in GaN have been revisited in samples specifically grown on bulk GaN templates, to avoid strain broadening of the optical spectra. Bound-exciton spectra can be studied in these samples for Mg concentrations up to [Mg]2×1019cm3. Contrary to previous work it is found that instabilities in the photoluminescence spectra are not due to unstable shallow donors, but to unstable Mg-related acceptors. Our data show that there are two Mg-related acceptors simultaneously present: the regular (stable) substitutional Mg acceptor, and a complex acceptor which is unstable in p-GaN.

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  • Received 26 January 2009

DOI:https://doi.org/10.1103/PhysRevLett.102.235501

©2009 American Physical Society

Authors & Affiliations

B. Monemar1,2, P. P. Paskov1, G. Pozina1, C. Hemmingsson1, J. P. Bergman1, T. Kawashima3, H. Amano3, I. Akasaki3, T. Paskova4, S. Figge5, D. Hommel5, and A. Usui6

  • 1Department of Physics, Chemistry and Biology, Linköping University, S-581 83 Linköping, Sweden
  • 2The Nanometer Structure Consortium, Lund University, Box 118, S-221 00, Lund, Sweden
  • 3Department of Materials Science and Engineering, Meijo University, 1-501 Shiogamaguchi, Tempaku-ku, Nagoya 468-8502, Japan
  • 4Kyma Technologies Inc., Raleigh, North Carolina 27617, USA
  • 5Institute of Solid State Physics, University of Bremen, D-28359 Bremen, Germany
  • 6R&D Division, Furukawa Co., Ltd. Tsukuba, Ibaraki 305-0856, Japan

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Issue

Vol. 102, Iss. 23 — 12 June 2009

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