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研究了五甲川菁敏化SnO_2纳米结构电极的光电化学行为.结合循环伏安曲线图及五甲川菁的光吸收阈值,初步确定五甲川菁染料电子基态和激发态能级位置.结果表明,五甲川菁染料电子激发态能级位置能与SnO_2纳米粒子导带边位置相匹配,因而使用该染料敏化可以显著地提高SnO_2纳米结构电极的光电流,使SnO_2纳米结构电极吸收波长红移至可见光区和近红外区,光电转换效率得到明显改善,IPCE值(单色光的转换效率)最高可达45.7％.
The photoelectrochemical behavior of the pentamethine-sensitized SnO_2 nanostructured electrode was investigated. The ground-state and excited-state energies of pentamethinecyanine dye were determined based on the cyclic voltammograms and the light absorption threshold of pentachomethachisocyanine. The results showed that five The position of electron-excited state of the mechlorethamine dye can match the position of the conduction band edge of the SnO 2 nanoparticle. Therefore, using this dye sensitization can significantly increase the photocurrent of the SnO 2 nanostructured electrode and red shift the absorption wavelength of the SnO 2 nanostructured electrode to visible light Area and near-infrared region, the photoelectric conversion efficiency has been significantly improved IPCE value (monochromatic light conversion efficiency) up to 45.7%.