Journal
NANOTECHNOLOGY
Volume 20, Issue 4, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0957-4484/20/4/045501
Keywords
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Funding
- Ministry of Education, Culture, Sports, Science and Technology (MEXT) of the Japanese Government [(A) 19206016]
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A nanowatt UV photoconductive detector made up of ultra-long (similar to 100 mu m) ZnO bridging nanowires has been fabricated by a single-step chemical vapor deposition (CVD) process. The electrodes, forming comb-shaped thick ZnO layers, and the sensing elements, consisting of ZnO nanowires bridging the electrodes, were fabricated simultaneously in a single-step CVD process. The device showed drastic changes (10-10(5) times) in current under a wide range of UV irradiances (10(-8) - 10(-2) W cm(-2)). Moreover, the detector exhibited fast response (rise and decay times of the order of 1 s) to UV illumination in air, but no response to visible light (hv < 3.2 eV). Our approach provides a simple and cost-effective way to fabricate high-performance 'visible-blind' UV detectors.
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