Journal
CURRENT APPLIED PHYSICS
Volume 13, Issue 1, Pages 165-169Publisher
ELSEVIER
DOI: 10.1016/j.cap.2012.07.005
Keywords
ZnO; Nanowire arrays; UV photodetector; Hydrothermal synthesis; Self-powered
Funding
- Major Project of International Cooperation and Exchanges [2012DFA50990]
- NSFC [51172022, 50972011]
- Beijing Municipal Commission of Education
- Fundamental Research Funds for the Central Universities
- Program for Changjiang Scholars and Innovative Research Team in University
- Beijing novel program [2008B19]
- Program for New Century Excellent Talents [NCET-09-0219]
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A ZnO nanowire (NW) array ultraviolet photodetector (PD) with Pt Schottky contacts has been fabricated on a glass substrate. Under UV light illumination, this PD showed a high photo-to-dark current ratio of 892 at 30 V bias. Interestingly, it was also found that this PD had a high sensitivity of 475 without external bias. This phenomenon could be explained by the asymmetric Schottky barrier height (SBH) at the two ends causing different separation efficiency of photogenerated electron-hole pairs, which resulted in the formation of photocurrent. It is anticipated to have potential applications in self-powered UV detection field. (C) 2012 Elsevier B.V. All rights reserved.
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