Enhancing UV photosensitivity of ZnO UV nanosensor using electrical stimulation at megahertz frequency
Li De-Zhao (李德钊), Zhu Rong (朱荣)
State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instruments and Mechanology,Tsinghua University, Beijing 100084, China
Abstract We report a novel technique to enhance the ultraviolent (UV) photosensitivity of ZnO nanosensor with ZnO nanowires bridged on micromachined metallic electrodes. The experimental results reveal that the photoconductivity and the time response of the ZnO nanowire sensor with either Schottky or Ohmic contacts are significantly improved by electrifying the nanowire sensors using an alternating current at the frequency of megahertz. An integrated UV sensor incorporating ZnO nanowires with a constant current mode driving circuit is developed, which demonstrates promising sensitivity and time response to UV illumination with a low power consumption.
(Photodetectors (including infrared and CCD detectors))
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 91123017).
Corresponding Authors:
Zhu Rong
E-mail: rong_zhu@263.net
Cite this article:
Li De-Zhao (李德钊), Zhu Rong (朱荣) Enhancing UV photosensitivity of ZnO UV nanosensor using electrical stimulation at megahertz frequency 2013 Chin. Phys. B 22 018502
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