低聚噻吩酸敏化多孔TiO2膜的光电转换性能

自从 Gratzel等 1 ]于 1991年发现染料敏化的 Ti O2 膜具有良好的光电转换性质以来 ,对染料敏化半导体太阳能电池的研究已成为半导体电化学领域的研究热点 2～ 4] ,这类电池的光电转换效率不断提高5,6] .但具有较高转换效率的器件多是采用液体电解质和价格昂贵的联吡啶钌化合物作为染料 ,不利于其实际应用的推广 .采用聚噻吩作为电解质 ,并兼敏化作用组装电池已见报道 7] .低聚噻吩酸具有一定的电导率 ,其分子连有端基羧酸 ,能有效地与 Ti O2 表面羟基作用而吸附 ,同时它们在可见光区有较好的吸光特性 ,是一种潜在的、具有敏化效应…

Photo-electric Conversion Properties of Oligo-thiophene Carboxylic Acid Sensitized Porous TiO2 Films

TiO2 films with nano-porous structures were obtained by adding the poly-ethylene glycol(PEG) in the TiO2 colloid. Then the as-prepared films were sensitized by the trithiophene carboxylic diacid(TTDA), pentathiophene carboxylic diacid(PTDA), N3Ru(Ⅱ)L2(SCN)2, L=2,2′-bipyridyl-4,4′-dicarboxylate] dye and the mixture of PTDA and N3 dye, respectively. After fabricating the films into devices, the I-V curves were determined and their photovoltaic properties were studied. The results show that the porous TiO2 films can be sensitized by both TTDA and PTDA effectively, while the film sensitized by the mixture of PTDA and N3 dye has a maximum photo-electric conversion efficiency.