Time-resolved cathodoluminescence of Mg-doped GaN
2008 (English)In: Applied Physics Letters, ISSN 0003-6951, Vol. 93, no 15Article in journal (Refereed) Published
The optical properties of GaN films doped with magnesium concentrations of the order of 1018 and 1019 cm-3 have been analyzed by picosecond time-resolved cathodoluminescence spectroscopy. Two luminescence bands in the vicinity of ~3.45 and ~3.27 eV are observed to increase in intensity with Mg concentration. They have been identified as related to acceptor-bound exciton and donor-acceptor pair (DAP) transitions, respectively. Time-resolved cathodoluminescence spectra, taken at low temperatures (~4 K), show that the lifetime of the DAP peak (3.27 eV) and of what appears to be its first longitudinal-optical phonon replica at ~3.19 eV decrease with increasing Mg concentration. These peaks differ in their recombination kinetics, strongly suggesting the existence of an underlying broad emission band which may be related to Mg. © 2008 American Institute of Physics.
Place, publisher, year, edition, pages
2008. Vol. 93, no 15
Engineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-48988DOI: 10.1063/1.3000383OAI: oai:DiVA.org:liu-48988DiVA: diva2:269884