Competitive surface effects of oxygen and water on UV photoresponse of ZnO nanowires

被引：222
|
作者：
Li, Yanbo [1 ]
Della Valle, Florent [1 ]
Simonnet, Mathieu [1 ]
Yamada, Ichiro [1 ]
Delaunay, Jean-Jacques [1 ]
机构：
[1] Univ Tokyo, Dept Engn Synth, Bunkyo Ku, Tokyo 1138656, Japan
来源：
APPLIED PHYSICS LETTERS | 2009年 / 94卷 / 02期
关键词：
humidity; II-VI semiconductors; nanowires; oxygen; photoconductivity; surface conductivity; surface recombination; wide band gap semiconductors; zinc compounds; ZINC-OXIDE; PARTIAL DISSOCIATION;
D O I：
10.1063/1.3073042
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
UV photoresponse of ZnO nanowires is measured in air under different humidity conditions to study the competitive surface effects of oxygen and water vapor. During UV illumination, it was found that the current decreases gradually under high humidity, whereas the current increases under low humidity. In the recovery phase, a change of two to three orders of magnitude in the decay time is observed by varying the humidity. A model that takes into account the solid-state process of photocarrier generation/recombination and the competitive surface effects of oxygen/water is proposed to explain the observed variations in photoresponse under different humidity conditions.
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页数：3
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