Surface photovoltage phase spectroscopy study of the photo-induced charge carrier properties of TiO2 nanotube arrays

被引：0
|
作者：
LiPing Chen
TengFeng Xie
DeJun Wang
ZhiYong Fan
TengFei Jiang
机构：
[1] Jilin University,State Key Laboratory of Theoretical and Computational Chemistry; College of Chemistry
来源：
Science China Chemistry | 2012年 / 55卷
关键词：
surface photovoltage; phase spectra; TiO; nanotube arrays; surface state; charge carrier property;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
By using the surface photovoltage (SPV) technique based on a lock-in amplifier, surface states located 3.1 eV below the conduction band of TiO2 have been detected in TiO2 nanotube arrays prepared by anodization of titanium foil in fluoride-based ethylene glycol solution. The photo-induced charge transportation behavior of TiO2 nanotube arrays was also studied by qualitatively analyzing their SPV phase spectra measured under different external bias. When a negative bias was applied, carriers excited from surface states have the same transportation properties as those excited from the valence band; in contrast, when a positive bias was applied, these two kinds of photo-excited carriers exhibit different transportation behavior.
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页码：229 / 234
页数：5
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