Origin of the slow photoresponse in an individual sol-gel synthesized ZnO nanowire

被引:170
作者
Ahn, Seung-Eon
Ji, Hyun Jin
Kim, Kanghyun
Kim, Gyu Tae
Bae, Chang Hyun
Park, Seung Min
Kim, Yong-Kwan
Ha, Jeong Sook
机构
[1] Korea Univ, Sch Elect Engn, Seoul 136701, South Korea
[2] Kyung Hee Univ, Dept Chem, Seoul 136701, South Korea
[3] Korea Univ, Dept Biol & Chem Engn, Seoul 136701, South Korea
关键词
D O I
10.1063/1.2721289
中图分类号
O59 [应用物理学];
学科分类号
摘要
Photocurrent of a single ZnO nanowire synthesized by a sol-gel route was investigated. In vacuum, the dark current was bigger but the photoresponse was slower than that in air, attributed to the release of the available charge carriers by the desorption of water molecules and the decrease of the exchange rates of molecular ions. Under the steady radiation of the ultraviolet light (lambda=325 nm), a gradual decrease of the photocurrent was noticeable, which can be explained in terms of the annihilation of the carriers by the replacement of hydroxyl groups (OH-) by O2-, resulting in the decrease of charge carriers. (c) 2007 American Institute of Physics.
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页数:3
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