TiO_2薄膜的优化及其对染料敏化太阳能电池性能的影响

Fabrication and optimization of TiO_2 film for dye-sensitized solar cells

介绍了染料敏化太阳能电池的制备过程,深入探讨了二氧化钛薄膜厚度、四氯化钛处理电极及添加大粒子散射层对电池效率的影响.研究结果表明,在一定范围内增加TiO2电极的厚度可以显著提高电池效率,但当电极过厚时,薄膜中的缺陷态增加,降低了电子的传输效率,导致光电流下降,电池效率降低;四氯化钛处理电极增强了基底导电面与薄膜界面以及二氧化钛粒子间的电接触,加快电子传输使光电流增强;引入散射层,提高了电池在长波段的光捕获效率,从而提高了电池的效率.

The technology parameters for preparing dye-sensitized solar cells（DSSC）,such as the thickness of TiO2 thin film,the TiO2 electrode processing with TiCl4,and adding scattering layer mixed by large particle were investigated.A proper thickness of TiO2 electrode can distinctly improve the conversion efficiency of DSSC.However,the defect density of thin film increases when the electrode thickness increases to the critical one.This results in the photocurrent decrease and the conversion efficiency decrease.TiCl4 treatment on TiO2 electrode can improve the DSSC performance.This effect is caused by reducing charge recombination,enhancing the necking between TiO2 particles,minimizing the recombination rate between the TiO2 film and the mediator,and improving electrical contiguity at the FTO/TiO2 interface.The scattering layer formed by admixing nanometer-size and submicron-size TiO2 particles greatly enhances the light absorption and the DSSC performance.