Ultraviolet emission property of undoped and Ag doped ZnO films

LIU Kai-peng; YANG Bei-fang; YAN Hong-wei; FU Zheng-ping; ZUO Jian

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Ultraviolet emission property of undoped and Ag doped ZnO films

1.
Department of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, China
2.
Structure Research Laboratory, University of Science and Technology of China, Hefei 230026, China

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Received Date: 10 May 2008
Rev Recd Date: 05 June 2008
Publish Date: 30 April 2009

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Abstract

Abstract

ZnO films were prepared on Si(100) substrates by ultrasonic spray pyrolysis technique. The effect of growth temperature, spray rate and Ag doping on the emission property of ZnO films was studied. Results show that appropriate growth temperature and spray rate could lead to the good quality, excellent photoluminescence property and high PL intensity ratio (R) of the UV emission to the deep-level emission. Among undoped ZnO films, the sample deposited at 500 ℃ with a spray rate of 015 mL/min has the strongest near-band edge (NBE) ultraviolet emission, with the largest R of 470. Ag doping (with the Ag:Zn atomic ratio=3%) could enhance the UV emission of ZnO films, with the R increasing to at least 700. But excessively high concentration of Ag dopant may degrade the UV luminescence property.

Abstract

ZnO films were prepared on Si(100) substrates by ultrasonic spray pyrolysis technique. The effect of growth temperature, spray rate and Ag doping on the emission property of ZnO films was studied. Results show that appropriate growth temperature and spray rate could lead to the good quality, excellent photoluminescence property and high PL intensity ratio (R) of the UV emission to the deep-level emission. Among undoped ZnO films, the sample deposited at 500 ℃ with a spray rate of 015 mL/min has the strongest near-band edge (NBE) ultraviolet emission, with the largest R of 470. Ag doping (with the Ag:Zn atomic ratio=3%) could enhance the UV emission of ZnO films, with the R increasing to at least 700. But excessively high concentration of Ag dopant may degrade the UV luminescence property.