Preparation and property of dye-sensitized solar cells based ZnO-TiO2 composite photoanodes
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摘要: 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。
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关键词:
- 染料敏化太阳能电池 /
- ZnO-TiO2复合光阳极 /
- 低温水溶液法 /
- 光伏性能 /
- 电化学阻抗谱
Abstract: 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 cell(DSSC). The effect of mass ratio of ZnO nano-flowers to TiO2 nano-particles 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. -
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