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. 2009 Jun 12;102(23):235501.
doi: 10.1103/PhysRevLett.102.235501. Epub 2009 Jun 9.

Evidence for two Mg related acceptors in GaN

B Monemar  1 , P P Paskov, G Pozina, C Hemmingsson, J P Bergman, T Kawashima, H Amano, I Akasaki, T Paskova, S Figge, D Hommel, A Usui
Affiliations

Evidence for two Mg related acceptors in GaN

B Monemar et al. Phys Rev Lett. .

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] approximately 2 x 10(19) cm(-3). 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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