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

被引：14

作者：

Chen LiPing ^{[1
]}

Xie TengFeng ^{[1
]}

Wang DeJun ^{[1
]}

Fan ZhiYong ^{[1
]}

Jiang TengFei ^{[1
]}

机构：

[1] Jilin Univ, Coll Chem, State Key Lab Theoret & Computat Chem, Changchun 130012, Peoples R China

来源：

SCIENCE CHINA-CHEMISTRY | 2012年 / 55卷 / 02期

基金：

中国国家自然科学基金;

关键词：

surface photovoltage; phase spectra; TiO2 nanotube arrays; surface state; charge carrier property; SENSITIZED SOLAR-CELLS; PHOTOGENERATED CHARGES; SEMIINSULATING GAAS; TEMPERATURE; GROWTH; LENGTH;

D O I：

10.1007/s11426-011-4335-6

中图分类号：

O6 [化学];

学科分类号：

0703 ;

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.

引用

页码：229 / 234

页数：6

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