Photoluminescence spectroscopy and positron annihilation spectroscopy probe of alloying and annealing effects in nonpolar m-plane ZnMgO thin films

Temperature-dependent photoluminescence characteristics of non-polar m-plane ZnO and ZnMgO alloy films grown by metal organic chemical vapor deposition have been studied. The enhancement in emission intensity caused by localized excitons in m-plane ZnMgO alloy films was directly observed and it can be further improved after annealing in nitrogen. The concentration of Zn vacancies in the films was increased by alloying with Mg, which was detected by positron annihilation spectroscopy. This result is very important to directly explain why undoped Zn1-xMgxO thin films can show p-type conduction by controlling Mg content, as discussed by Li [Appl. Phys. Lett. 91, 232115 (2007)].

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Made available in DSpace on 2010-05-04T14:11:35Z (GMT). No. of bitstreams: 1 Photoluminescence spectroscopy and positron annihilation spectroscopy probe of alloying and annealing effects in nonpolar m-plane ZnMgO thin films.pdf: 349980 bytes, checksum: 68edb24d2fdccb0cf4b8e1ed92fbffb4 (MD5) Previous issue date: 2010

863 High Technology R&D Program of China 2007AA03Z402 2007AA03Z451；Special Funds for Major State Basic Research Project (973 program) of China 2006CB604907；National Science Foundation of China 60506002

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863 High Technology R&D Program of China 2007AA03Z402 2007AA03Z451；Special Funds for Major State Basic Research Project (973 program) of China 2006CB604907；National Science Foundation of China 60506002