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Influence of thin metal nanolayers on the photodetective properties of ZnO thin films

J. Appl. Phys. 106, 083110 (2009); doi:10.1063/1.3251370

Published 28 October 2009

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K. W. Liu,1 B. Liu,1 S. J. Wang,2 Z. P. Wei,1 T. Wu,1 C. X. Cong,1 Z. X. Shen,1 X. W. Sun,3 and H. D. Sun1
1Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
2Institute of Materials Research and Engineering, Singapore 117602, Singapore
3School of Electrical and Electronic Engineering, Nanyang Technological University, Nanyang Avenue, Singapore 639798, Singapore
We investigate the photoconductivity properties of ZnO thin films prepared by pulsed laser deposition with and without metals (Au or Pt) on the surface. The covering of nanostructured metals can largely enhance the photocurrent. Meanwhile, the dark currents have been increased significantly due to the increase in carrier concentration and mobility near the surface of ZnO thin film. Although plasmonic effect was observed by the photoluminescence enhancement, the main mechanism of the increase in the dark current and photoresponsivity for ZnO photoconductors has been interpreted by surface states, interface states, and persistent photoconductivity. ©2009 American Institute of Physics
History: Received 30 August 2009; accepted 22 September 2009; published 28 October 2009
Permalink: http://link.aip.org/link/?JAPIAU/106/083110/1
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KEYWORDS and PACS

Keywords
PACS
  • 73.61.Ga
    Electrical properties of II-VI semiconductors (thin films)
  • 81.15.Fg
    Laser deposition
  • 73.50.Pz
    Photoconduction and photovoltaic effects in thin films
  • 72.20.Fr
    Low-field transport and mobility; piezoresistance (semiconductors/insulators)
  • 73.50.Dn
    Low-field transport and mobility; piezoresistance (thin films)
  • 73.40.Ns
    Electrical properties of metal-nonmetal contacts
  • 73.20.At
    Surface states, band structure, electron density of states
  • YEAR: 2009

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PUBLICATION DATA

ISSN:
0021-8979 (print)   1089-7550 (online)
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