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Journal of Nanomaterials
Volume 2012, Article ID 602398, 5 pages
Research Article

Zinc Oxide Nanoparticle Photodetector

1Center for Micro/Nano Science and Technology and Advanced Optoelectronic Technology Center, National Cheng Kung University, Tainan 70101, Taiwan
2Department of Electrical Engineering & Institute of Microelectronics, National Cheng Kung University, Tainan 70101, Taiwan
3The Instrument Development Center, National Cheng Kung University, Tainan 701, Taiwan

Received 24 January 2012; Revised 17 May 2012; Accepted 18 May 2012

Academic Editor: Michael Hu

Copyright © 2012 Sheng-Po Chang and Kuan-Jen Chen. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A zinc oxide (ZnO) nanoparticle photodetector was fabricated using a simple method. Under a 5 V applied bias, its dark current and photocurrent were 1.98×10-8 and 9.42×10-7 A, respectively. In other words, a photocurrent-to-dark-current contrast ratio of 48 was obtained. Under incident light at a wavelength of 375 nm and a 5 V applied bias, the detector’s measured responsivity was 3.75 A/W. The transient time constants measured during the turn-ON and turn-OFF states were τON=204 s and τOFF=486 s, respectively.