title: Positron annihilation lifetime and photoluminescence studies on single crystalline ZnO.
abstract: The room temperature positron annihilation lifetime for single crystalline ZnO has been measured as 164 ± 1 ps. The single component lifetime value is very close to but higher than the theoretically predicted value of ~154 ps. Photoluminescence study (at 10 K) indicates the presence of hydrogen and other defects, mainly acceptor related, in the crystal. Defects related to a lower open volume than zinc vacancies, presumably a complex with two hydrogen atoms, are the major trapping sites in the sample. The bulk positron lifetime in ZnO is expected to be a little less than 164 ps.
authors: Department of Physics, Bangabasi Morning College, 19 Rajkumar Chakraborty Sarani, Kolkata 700009, India.
authors: A
authors: A
authors: Sarkar
authors: Mahuya
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authors: Chakrabarti
authors: S K
authors: SK
authors: Ray
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authors: D
authors: Bhowmick
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authors: Sanyal