Surface passivation using pyridinium iodide for highly efficient planar perovskite solar cells  

作　　者：Yitian Du Jihuai Wu Xinpeng Zhang Qianjin Zhu Mingjing Zhang Xuping Liu Yu Zou Shibo Wang Weihai Sun 

机构地区：[1]Engineering Research Center of Environment-Friendly Functional Materials,Ministry of Education,Fujian Engineering Research Center of Green Functional Materials,Institute of Materials Physical Chemistry,Huaqiao University,Xiamen 361021,Fujian,China

出　　处：《Journal of Energy Chemistry》2021年第1期84-91,I0004,共9页能源化学（英文版）

基　　金：the joint financial support from the National Natural Science Foundation of China (No. U1705256, 51972123, 21771066 and 61804058);the Cultivation Program for Postgraduate in Scientific Research Innovation Ability of Huaqiao University (No. 18014087027)。

摘　　要：Perovskite solar cells have developed rapidly in the past decades.However,there are large amounts of ionic defects at the surface and grain boundaries of perovskte films which are detrimental to both the efficiency and stability of perovskite solar cells.Here,an organic halide salt pyridinium iodide(PyI) is used in cation-anion-mixed perovskite for surface defect passivation.Different from the treatment with Lewis base pyridine(Py) which can only bind to the under-coordinated Pb ions,zwitterion molecule PyI can not only fill negative charged iodine vacancies,but also interact with positive charged defects.Compared with Py treatment,PyI treatment results in smoother surface,less defect densities and nonradiative recombination in perovskite,leading to an improved VOC, negligible J-V hysteresis and stable performance of devices.As a result,the champion PyI-treated planar perovskite solar cell with a high VOC of 1.187 V achieves an efficiency of 21.42%,which is higher than 20.37% of Py-treated device,while the pristine device without any treatment gets an efficiency of 18.83% at the same experiment conditions.

关 键 词：Perovskite solar cell Surface defect PASSIVATION Pyridinium iodide 

分 类 号：TM914.4[电气工程—电力电子与电力传动] TB383.2[一般工业技术—材料科学与工程]