Photoelectric properties of ZnO/Ag₂S heterostructure and its photoelectric ethanol sensing characteristics

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• 作者：Yu Zhang^a ; ^b ; Bingkun Liu^a ; Dejun Wang^a ; Yanhong Lin^a ; Tengfeng Xie^a ; ^{xietf@jlu.edu.cn} ; Jiali Zhai^a
• 关键词：Semiconductors ; Chemical synthesis ; Electrochemical techniques ; Heterostructures
• 刊名：Materials Chemistry and Physics
• 出版年：2012
• 期刊代码：58_02540584
• 类别：ms
• 出版时间：16 April, 2012
• 卷：133
• 期：2-3
• 页码：834-838
• 文件大小：769 K

摘要

The photoelectric properties of ZnO microspheres, ZnO/Ag₂S heterogeneous microspheres and Ag₂S hollow microspheres were investigated systematically by surface photovoltage, transient photovoltage and surface photocurrent techniques. The ZnO/Ag₂S heterostructure shows superior photoelectric properties in visible-light region compared with pure Ag₂S. Transient photovoltage results reveal the separation processes of photo-generated charge carriers in the samples. The photoelectric ethanol sensing property induced by visible light for the ZnO/Ag₂S heterostructure has been found, which should be valuable for the practical application of semiconductor gas sensors at room temperature.