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Surface photovoltage phase spectroscopy study of the photo-induced charge carrier properties of TiO2 nanotube arrays
Authors:LiPing Chen  TengFeng Xie  DeJun Wang  ZhiYong Fan  TengFei Jiang
Institution:1. State Key Laboratory of Theoretical and Computational Chemistry; College of Chemistry, Jilin University, Changchun, 130012, China
Abstract: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.
Keywords:surface photovoltage  phase spectra  TiO 2 nanotube arrays  surface state  charge carrier property
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