Stabilizing wide-bandgap halide perovskites through hydrogen bonding  

作　　者：Lei Tao Xiaoqin Du Jianfei Hu Shixuan Wang Chen Lin Qi Wei Yingdong Xia Guichuan Xing Yonghua Chen 

机构地区：[1]Key Laboratory of Flexible Electronics(KLOFE)&Institution of Advanced Materials(IAM),Nanjing Tech University(Nanjing Tech),Nanjing 211816,China [2]Joint Key Laboratory of the Ministry of Education,Institute of Applied Physics and Materials Engineering University of Macao,Macao SAR 999078,China

出　　处：《Science China Chemistry》2022年第8期1650-1660,共11页中国科学（化学英文版）

基　　金：financially supported by the Natural Science Foundation of China(91833304 and 51972172);Natural Science Foundation of Jiangsu Province for Distinguished Young Scholars,China(BK20200034);the Young 1000 Talents Global Recruitment Program of China。

摘　　要：Wide-bandgap(WBG)perovskites have emerged as promising materials for the construction of perovskite/silicon tandem solar cells.However,poor long-term operational stability due to the notorious photo-induced halide segregation is commonly observed.Here,we report the synthesis of stable~1.73 eV MA-based mixed I/Br WBG perovskites by ionic liquid solvent,methylammonium acetate(MAAc).The special internal hydrogen bond(N–H…I and N–H…Br)environment in the ionic liquid MAAc solvent over traditional N,N-dimethylformamide/dimethyl sulfoxide solvent stabilizes the diffusion of halide ions.This allows the suppression of the halide segregation in the mixed I/Br WBG perovskite film,which is previously suggested to be difficult.The hydrogen bonds also enable excellent decoupling of the crystal nucleation and growth process.Finally,a champion device efficiency of 20.59%is achieved,which is one of the highest reports,with improved ambient air,heat,and light stability.

关 键 词：wide-bandgap perovskite hydrogen bonds perovskite solar cells ionic liquid 

分 类 号：TM914.4[电气工程—电力电子与电力传动] TB34[一般工业技术—材料科学与工程]