Surface photovoltage phase spectroscopy study of the photo-induced charge carrier properties of TiO_(2) nanotube arrays  

作　　者：CHEN LiPing XIE TengFeng WANG DeJun FAN ZhiYong JIANG TengFei 

机构地区：[1]State Key Laboratory of Theoretical and Computational Chemistry,College of Chemistry,Jilin University,Changchun 130012,China

出　　处：《Science China Chemistry》2012年第2期229-234,共6页中国科学(化学英文版)

基　　金：supported by the National Basic Research Program of China (973 Program,2007CB613303);the National Natural Science Foundation of China (20873053)

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 TiO_(2) have been detected in TiO_(2) nanotube arrays prepared by anodization of titanium foil in fluoride-based ethylene glycol solution. The photo-induced charge transportation behavior of TiO_(2) nanotube arrays was also studied by quali- tatively 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..By using the surface photovoltage (SPV) technique based on a lock-in amplifier, surface states located 3.1 eV below the conduction band of TiO_(2) have been detected in TiO_(2) nanotube arrays prepared by anodization of titanium foil in fluoride-based ethylene glycol solution. The photo-induced charge transportation behavior of TiO_(2) nanotube arrays was also studied by quali- tatively 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.

关 键 词：surface photovoltage phase spectra TiO_(2) nanotube arrays surface state charge carrier property 

分 类 号：O614.411[理学—无机化学] TB383.1[理学—化学]