纳米晶TiO_2工作电极厚度对染料敏化太阳能电池性能的影响

Effect of the nanocrystalline TiO_2 film thickness on the performance of dye-sensitized solar cells

喷涂法是制备二氧化钛(TiO_2)薄膜的常用方法之一。通过控制喷涂时间制备不同厚度纳米晶TiO_2薄膜,将其作为染料敏化电池(DSSCs)光阳极进行电池组装。通过测定光电转化效率IPCE、I-V曲线等电池性能指标探究不同厚度纳米晶TiO_2薄膜对DSSCs性能影响,结果发现,纳米晶TiO_2薄膜厚度增加有利于提高DSSCs短路电流;DSSCs光电转换效率η呈现先增加后减少的趋势,当喷涂时间从2min增加到6min,由2.68%升高至4.48%,提高了66.76%;当喷涂时间由8min增加至12min,转换效率出现略微下降,上述工作的开展对于优化DSSCs的性能具有一定的现实意义。

The spraying methodwidely used in the preparation of TiO2 film.In our experiment,the TiO2 films with different thickness were prepared by controlling the spray time.The photoelectrochemical experiments were performed in a sandwich type two-electrode cell and I-V curves were obtained to investigate TiO2 film thickness on the performance of DSSCs.Result of solar cell test manifested that a enhanced short ciruit current is attributed to the increase of TiO2 film thickness,then the efficiency increases from 2.68% to 4.48%,showing a 66.76% improvement when the spraying time prolong from 2 to 6 min.Nevertheless,the efficiency displayed a small drop when we continued to increase the spraying time from 8 to 1 2 min.