氯化铯甲醇溶液对有机聚合物太阳能电池的影响

摘要

研究了氯化铯的甲醇溶液作为阴极修饰层，来提高传统有机聚合物太阳能电池器件性能。通过电容-电压( C-V)测试分析了铝电极和 PTB7/PC70 BM 之间的界面电荷积累情况，同时测试了紫外光电子能谱( UPS)，对铝的功函数改变作了研究。结果表明，采用氯化铯的甲醇溶液作阴极修饰层的器件，其短路电流(Jsc)、开路电压(Voc)、填充因子(FF)都有所提高，光电转化效率达到6.36％，与仅用甲醇处理过的器件相比，光电转化效率提高了11％；与未经甲醇处理的器件相比，光电转化效率提高了42.6％。这种一步溶液处理法能够减少电荷积累，同时降低铝电极的功函数，利于电子收集，进而提高器件性能。%The cesium chloride ( CsCl) methanol solution was introduced into the conventional or-ganic polymer solar cells as cathode buffer layer to improve its properties. The charge accumulation between the Al cathode and PTB7/PC70 BM was analyzed through capacitance-voltage ( C-V) meas-urement and the change of work function of Al was investigated by ultraviolet photoelectron spectros-copy (UPS). The results show that the short-circuit current (Jsc), the open-circuit voltage (Voc), the fill factor and the power conversion efficiency ( PCE) of the device with the CsCl methanol solu-tion treatment have been improved. And the PCE reaches 6. 36%, which has been improved 11%compared with the methanol treatment devices and 42 . 6% compared with the devices without any treatment. This one-step solution treatment can improve the device properties by reducing the charge accumulation and decreasing the work function of Al cathode which is benefit to electron collection.