【摘要】 用光电化学方法研究了三甲川菁染料敏化TiO2纳米晶电极的光电化学行为。结合三甲川菁Cy3的UV-Vis吸收光谱和循环伏安曲线,确定了染料Cy3电子基态和激发态能级位置。结果表明,Cy3电子激发态能级位置能与TiO2纳米粒子导带边位置相匹配,因而用染料Cy3敏化TiO2纳米晶电极,可使其吸收波由紫外光区红移至可见光区,显著提高了TiO2纳米晶电极在可见光区的光电流密度,光电转换效率得到明显改善,在膜厚为6.5μm、敏化时间为4h的条件下,IPCE值(incident photo-to-electricity conversion efficiency)最高可达22.9%,甲醇浸泡处理可进一步提高至29.0%,此时光电池的光电转换效率η=1.51%。更多还原

【Abstract】 The photoelectrochemical behavior of the TiO2 nanocrystalline electrode sensitized by Cy3(novel squarylium cyanine dye) was studied. The ground state level and the excited state level of the dye were determined by means of cyclic voltammetry and optical absorption spectroscopy. The results showed that the excited state level of this dye matches the conduction band edge of TiO2 nanoparticles. Therefore the sensitization of TiO2 nanocrystalline electrode with the dye can obviously increase the photocurrent density and result in a red-shift of optical absorption from the ultra-violet region to the visible region. As a result, the light-to-electricity conversion efficiency was greatly improved and the maximum value of IPCE reached 22.9% and η was 1.37% when the TiO2 nanostructured porous film was 6.5 μm thick and was sensitized for 4 h. The values above mentioned could be improved to 29.0% and 1.51% after the sensitized electrode was treated with methanol.更多还原