溶剂处理对钙钛矿太阳能电池性能的影响

Effect on Perovskite Solar Cell Performance from Solvent Treatment

研究了二甲基亚砜(DMSO)溶剂预处理对钙钛矿活性层的影响,发现溶剂预处理可以提高钙钛矿太阳能电池器件性能。通过X-ray diffraction(XRD)测试,指出溶剂处理前后薄膜中Pb I2的残留量的改变,同时使用scanning electron microscope(SEM)表征了不同的钙钛矿薄膜和碘化铅薄膜的形貌。采用电流-电压(I-V),薄膜吸收和外量子效率(EQE)测试分析溶剂处理前后的器件的性能差异。结果表明,采用DMSO溶剂预处理的器件,其短路电流(Jsc)有大幅度提高,光电转化效率达到11.1%,与未处理过的的器件相比,光电转化效率提高了17.2%。这种溶剂处理法将会减少碘化铅的残留以及改变钙钛矿薄膜成膜后晶体大小和表面形貌,进而提高器件性能。

The dimethyl sulfoxide（DMSO） solvent treatment is introduced into the perovskite polymer solarcell to improve its properties. The X-ray diffraction（XRD） has been used to analyze the remnant Pb I2 in the film af-ter the reaction and the morphologies of the perovskite and Pb I2 films are investigated by using a scanning electronmicroscope（SEM）. Current-Voltage（I-V）, absorption and external quantum efficiency（EQE） measurements are car-ried out to investigate the differences of the properties between the devices with and without the solvent treatment.Through investigation, a significant improvement is found in short circuit current（Jsc） of the devices treated byDMSO and the efficiency achieved 11.1%, which has improved 17.2% when compared with the devices without sol-vent treatment. This method will reduce the remnant of Pb I2 and change the crystal size as well as surface morpholo-gy of perovskite film, which results in an enhanced property.