染料敏化太阳电池多孔TiO_2微结构的研究  

Micro-structure study of dye-sensitized solar cell multi-porous TiO_2

作　　者：李亮[1,2] 彭冰霜 吴旭苹[2] 晏刚[2] 王新东[1,2] 

机构地区：[1]北京科技大学高效钢铁冶金国家重点实验室,北京100083 [2]北京科技大学物理化学系,北京100083

出　　处：《电源技术》2014年第6期1071-1074,共4页Chinese Journal of Power Sources

摘　　要：太阳电池成为高性价比发电系统需要具备三个特点:高效率,高稳定性和低成本。但是高性价比的光伏发电系统至今仍未开发出来。低成本的太阳电池的制造不需要真空条件,如印刷,喷涂,旋涂,电化学沉积等。采用低成本的喷涂法在FTO导电玻璃基体上制备多孔纳米TiO2薄膜光阳极,电解液为0.50 mol/L LiI、0.05 mol/L I2的乙氰溶液,对电极为铂片,通过改变添加剂聚乙烯醇(PVA)的含量,研究PVA对染料敏化太阳电池多孔TiO2微结构及染料敏化太阳电池性能的影响。通过对光阳极扫描电子显微镜(SEM)、I-V曲线、TiO2薄膜染料吸附量和交流阻抗EIS图谱的分析,得到结果如下:随着聚乙烯醇(PVA)含量的增加,TiO2颗粒团聚程度减轻,暗电流逐渐减少但染料吸附量也在减小,当mPVA∶mTiO2=0.03∶0.12时,TiO2颗粒分布均匀,TiO2颗粒间能形成较好的电子通道,染料吸附量和暗电流达到最佳配匹,获得最好的光电转换效率为3.72%。Solar cells require three characteristics to be cost-effective power generation systems： high efficiency, high stability and low cost. However, a cost-effective photovoltaic power system has not yet been developed. The fabrication of low cost solar cells doesn＇t require vacuum methods, such as screen printing, spray deposition, spin coating and electrochemical deposition. The multi-porous nano-TiO2 thin film photo-anode was prepared on FTO conductive glass substrate by slurry spray coating technique, while electrolyte was 0.50 mol/L Lil and 0.05 mol/L 12, and counter electrode was Pt. The influences of polyving akohol （PVA） on the performance and multi-porous TiO2 micro-structure of dye-sensitization solar cell were researched by changing the percentage of PVA in TiO2. Through the analysis of SEM of photo-anode, I-V curve, dye adsorption of titanium dioxide thin film and electrochemical impedance spectroscopy, it can be concluded that with the increase of PVA content, TiO2 particles agglomeration and dye adsorption amount decrease, and the dark current reduces. When adding content of PVA is 25% in TiO2, TiO2 particles uniformly distdbute, and TiO2 particles can form better electronic channels, and dye adsorption amount and dark current achieve the best match. The best photoelectric conversion efficiency （3.72%） is obtained.

关 键 词：染料敏化太阳电池 聚乙烯醇 暗电流 光电转换效率 交流阻抗图谱 

分 类 号：TM914[电气工程—电力电子与电力传动]