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中文摘要：
用光电流作用谱、光电流-电势图等光电化学方法研究了聚3-己基噻吩（P3HT）及3-己基噻吩和2-噻吩甲酸共聚物（CTCHT）修饰纳米结构TiO2电极的光电转换性质。结果表明，经修饰后的纳米TiO2电极光电流明显增强，光电转换效率得到明显提高。在复合膜电极中存在p-n异质结，异质结的存在有利于光生电子。空穴对的分离，降低了电荷的反向复合几率，提高了光电转换效率。
英文摘要：
The photo-current conversion properties of nanostructured TiO2/Poly （3-hexylthiophene） （P3HT） and TiO2/Copolymer of 3-hexylthiophene and thiophene-2-acetic acid（CTCHT） film electrode were studied by the photocurrent action spectra and the photocurrent dependence of potential. The diagram of energy level of P3HT and CTCHT film was determined with cyclic voltamogramm and photoelectrochemical method. The bandgaps of P3HT and CTCHT were determined to be 1.90 eV and 2.44 eV respectively . The p-n heterojuction was existed in the nanostructured TiO2/P3HT and TiO2/CTCHT film electrode respectively, which favored the separation of electron-hole pairs generated by photoexcitation. The conversion efficiency of light to electricity for TiO2/P3HT and TiO2/CTCHT film electrode was largely improved comparing with that for the nanostructured TiO2electrode alone. The difference of photo-current conversion efficiency of TiO2/P3HT from that of TiO2/CTCHT film electrode resulted from the difference of the energy level of P3HT and TiO2with that of CTCHT and TiO2.
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