卟啉、酞菁共敏化二氧化钛纳米电极

研究了染料对锌卟啉-氢卟啉(ZnTSPP-H~2TSPP)、锌卟啉-镓酞菁(ZnTSPP-GaTSPc)共敏化二氧化钛纳米电极的光电转换特性和H~2TSPP,GaTSPc在电极表面的聚集态对光电转换的影响,共敏化显著提高了电极的光电转换并产生了混合效应。提出了低占据电荷转移的共敏化机理。

Cosensitization of a nanostructured TiO~2 electrode with tetrasulfonated porphyrins and phthalocyanine

Photo - to - electric conversion of a nanostructured TiO2 electrode cosensitized with dye pairs of ZnTSPP - H2TSPP and ZnTSPP - GaTSPc was investigated. Doping of ZnTSPP reduces self -aggregation of H2TSPP and GaTSPc in the surface of the electrode. Cosensitization markedly enhances the photoelectric response of Q band and in the meantime greatly decreases that of Soret band under monochromatic illumination. But this decrease in Soret band is off - set by the enhancement of Q band. As a result, cosensitization improves the total photo - to - electric conversion in the whole wavelength range and creates the mixed effect in short - circuit photocurrent. The photoelectric behaviors of the cosensitized electrode is attributed to the presence of a low - lying charge - transfer state originating from the formation of heteroaggregates in dye pairs of ZnTSPP - H2TSPP and ZnTSPP - GaTSPc.