Evidence for Two Mg Related Acceptors in GaN
2009 (English)In: PHYSICAL REVIEW LETTERS, ISSN 0031-9007, Vol. 102, no 23, 235501- p.Article in journal (Refereed) Published
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]approximate to 2x10(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.
Place, publisher, year, edition, pages
2009. Vol. 102, no 23, 235501- p.
IdentifiersURN: urn:nbn:se:liu:diva-19654DOI: 10.1103/PhysRevLett.102.235501OAI: oai:DiVA.org:liu-19654DiVA: diva2:227218