Mechanism for radiative recombination in ZnCdO alloys
2007 (English)In: Applied Physics Letters, ISSN 0003-6951, Vol. 90, no 26Article in journal (Refereed) Published
Temperature dependent cw- and time-resolved photoluminescence combined with absorption measurements are employed to evaluate the origin of radiative recombination in ZnCdO alloys grown by molecular-beam epitaxy. The near-band-edge emission is attributed to recombination of excitons localized within band tail states likely caused by nonuniformity in Cd distribution. Energy transfer between the tail states is argued to occur via tunneling of localized excitons. The transfer is shown to be facilitated by increasing Cd content due to a reduction of the exciton binding energy and, therefore, an increase of the exciton Bohr radius in the alloys with a high Cd content. © 2007 American Institute of Physics.
Place, publisher, year, edition, pages
2007. Vol. 90, no 26
IdentifiersURN: urn:nbn:se:liu:diva-38865DOI: 10.1063/1.2751589Local ID: 45927OAI: oai:DiVA.org:liu-38865DiVA: diva2:259714