Surface photovoltage spectra and photoelectrochemical properties of semiconductor-sensitized nanostructured TiO₂ electrodes

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• 作者：Qian ; Xinming ; Qin ; Dongqi ; Song ; Qing ; Bai ; Yubai ; Li ; Tiejin ; Tang ; Xinyi ; Wang ; Erkang ; Dong ; Shaojun
• 关键词：Surface photovoltage spectra ; Photoelectrochemistry ; Semiconductors ; Nanostructures
• 刊名：Thin Solid Films
• 出版年：2001
• 期刊代码：78_00406090
• 类别：ph
• 出版时间：April 2, 2001
• 卷：385
• 期：1-2
• 页码：152-161
• 文件大小：220 K

摘要

Three kinds of TiO₂ nanostructured thin films and their CdS-sensitized films, consisting of different sizes of TiO₂ nanoparticles prepared with different methods, have been investigated. The surface photovoltage spectra (SPS) measurements indicate that the density of surface states on TiO₂ is likely dependent upon the details of prepared methods. TiO₂ particles prepared from basic sol have more surface states than that prepared from acidic sol. When the TiO₂ thin films prepared using the TiO₂ sols were sensitized by CdS particles, the SPS responses relative to the surface states on TiO₂ from 350 to 800 nm were decreased. The photoelectrochemical properties of nanostructured TiO₂ electrodes suggest that the fewer the surface states and the smaller the particle sizes of TiO₂, the larger the photocurrent response. For CdS sensitized TiO₂ thin film electrode, it is shown that the semiconductor sensitization is an efficient way to decrease the influence of surface states on the charge separation, and can improve the intensity of photocurrent response.