Slow-rise and fast-drop current feature of ultraviolet response spectra for ZnO-nanowire film modulated by water molecules

doi:10.1088/1674-1056/21/3/038104

Abstract This study describes the fabrication of ZnO-nanowire films by electro-chemical anodization of Zn foil. The ZnO films are characterized by field emission scanning electron microscopy, X-ray diffraction patterns, and transmission electron microscopy, respectively. The ultraviolet (UV) photo-response properties of the surface-contacted ZnO film are studied through the current evolution processes under different relative humidities. Unlike the usually observed current spectra of the ZnO films, the drop time is shorter than the rise time. The photo-conductivity gain G and the response time τ are both increased with the increase of the applied bias. The photo-conductivity gain G is lowered with the increase of the environmental humidity, while the response time τ is increased. These results can be explained by considering three different surface processes: 1) the electron-hole (e-p) pair generation by the UV light illumination, 2) the following surface O₂^- species desorption, and 3) the photo-catalytic hydrolysis of water molecules adsorbed on the ZnO surface. The slow-rise and fast-drop current feature is suggested to originate from the sponge-like structure of the ZnO nanowires.

Keywords: electro-chemical anodization ZnO nanowires ultraviolet detector

Received: 15 October 2011
Revised: 07 November 2011
Accepted manuscript online:

PACS:	81.16.Be	(Chemical synthesis methods)
	81.07.Gf	(Nanowires)
	85.60.Gz	(Photodetectors (including infrared and CCD detectors))

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 60907023), the Shandong Excellent Young Scientist Research Award Fund Project, China (Grant No. BS2011CL002), the Natural Science Foundation of Heilongjiang Province, China (Grant No. A200912), and the Science and Technology Progress Project of Weihai, China (Grant Nos. IMJQ01110003 and 20090393).

Corresponding Authors: Qu Shi-Liang,slqu1@yahoo.com.cn
E-mail: slqu1@yahoo.com.cn

Cite this article:

Ren Shou-Tian(任守田), Wang Qiang(王强), Zhao Feng (赵锋), and Qu Shi-Liang(曲士良) Slow-rise and fast-drop current feature of ultraviolet response spectra for ZnO-nanowire film modulated by water molecules 2012 Chin. Phys. B 21 038104

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Slow-rise and fast-drop current feature of ultraviolet response spectra for ZnO-nanowire film modulated by water molecules

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