Enlarging grain sizes for efficient perovskite solar cells by methylamine chloride assisted recrystallization  

作　　者：Gao Wu Molang Cai Yujia Cao Zhuoxin Li Zhongyan Zhang Weng Yang Xianggang Chen Dongxu Ren Yaqi Mo Miao Yang Xuepeng Liu Songyuan Dai 

机构地区：[1]State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources,North China Electric Power University,Beijing 102206,China [2]Beijing Key Laboratory of Novel Thin-Film Solar Cells,North China Electric Power University,Beijing 102206,China [3]Jiangsu Shunfeng Photovoltaic Technology Co.Ltd.,Changzhou 213164,Jiangsu,China

出　　处：《Journal of Energy Chemistry》2022年第2期55-61,共7页能源化学（英文版）

基　　金：financially supported by the National Key R&D Program of China (Grant No. 2020YFB1506404);the 111 Project (Grant No. B16016);the National Natural Science Foundation of China (Grant Nos. 51961165106, 51572080 and 61904053);the Fundamental Research Funds for the Central Universities (Grant Nos. 2019MS026, 2019MS027 and 2020MS080)。

摘　　要：The quality of MAPbI3 film prepared by solvent engineering process highly depends on environment and antisolvent control.Here,we provided a simple methylamine chloride(MACl)solution treatment using a two-step process to enlarge the perovskite crystal grain sizes to more than 1 lm.Other than treatment on the film surface,the MACl solution diffuses into the MAPbI_(3) films to assist the recrystallization of small crystal at the bottom of perovskite film.The imitative contact between perovskite and substrate is formed.Meanwhile,the enlargement of grain size and ten times enhancement of crystalline reduce trap-assisted recombination of perovskite films.Thus,the significant improvement of cell efficiency of 20.89%as well as device stability is obtained with the MACl treatment.

关 键 词：Perovskite solar cells Methylamine chloride Large grain size High efficiency 

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