ZnO-TiO_2染料敏化太阳能电池的制备和性能

Preparation and property of dye-sensitized solar cells based ZnO-TiO_2 composite photoanodes

采用低温水溶液法制备ZnO纳米花,将其与TiO2纳米颗粒以不同的质量比混合制备成复合浆料,采用刮涂法涂敷在掺氟的SnO2透明导电玻璃(FTO)上制备ZnO纳米花-TiO2纳米颗粒复合薄膜光阳极,与Pt对电极和电解质组装成染料敏化太阳能电池(DSSC)。通过光伏性能和电化学阻抗谱测试分析,研究ZnO纳米花与TiO2纳米颗粒的质量比对电池性能的影响。结果表明:随着光阳极中TiO2纳米颗粒的增加,DSSC的开路电压和填充因子提高,当ZnO与TiO2的质量比为83∶17时,光电转换效率最高达3.20%;ZnO-TO2染料电池的阻抗谱类似于Gerischer阻抗谱,电子的扩散阻抗与背反应复合阻抗相耦合。

The composite photoanodes with different mass ratios of ZnO nano flowers to TiO2 nano-particles were prepared on transparent conductive fluorine-doped SnO2 （FTO） substrates by doctor-blade technique. These anodes were sealed together with Pt-counter electrode to assemble into dye-sensitized solar celI（DSSC）. The effect of mass ratio of ZnO nano-flowers to TiO2 nano-partieles on the performance and electron transport properties of DSSC were studied by means of the photocurrent - voltage curve and electrochemical impedance spectroscopy. The results show that open-circuit voltage and fill factor of DSSC increase with increasing the mass ratio of TiO2 nanopartices in composite photoanodes. The energy conversion efficiency reaches 3. 20% when the mass ratio of ZnO to TiO2 is 83 ： 17. The impedance spectrum of DSSC assembled from ZnO - TiO2 composite anodes is similar to Gerisher impedance, and the impedance of diffusion is coupled with impedance of recombination.