title: Evidence for two Mg related acceptors in GaN.
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.
authors: Department of Physics, Chemistry and Biology, Linköping University, S-581 83 Linköping, Sweden.
authors: B
authors: B
authors: Monemar
authors: P P
authors: PP
authors: Paskov
authors: G
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authors: Pozina
authors: C
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authors: Hemmingsson
authors: J P
authors: JP
authors: Bergman
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authors: Kawashima
authors: H
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authors: Amano
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authors: Akasaki
authors: T
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authors: Paskova
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authors: Figge
authors: D
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authors: Hommel
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authors: Usui