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Stable Triple Cation Perovskite Precursor for Highly Efficient Perovskite Solar Cells Enabled by Interaction with 18C6 Stabilizer
Author(s) -
Wu Xiayan,
Jiang Yue,
Chen Cong,
Guo Jiali,
Kong Xiangyu,
Feng Yancong,
Wu Sujuan,
Gao Xingsen,
Lu Xubing,
Wang Qianming,
Zhou Guofu,
Chen Yiwang,
Liu JunMing,
Kempa Krzysztof,
Gao Jinwei
Publication year - 2020
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201908613
Subject(s) - passivation , materials science , energy conversion efficiency , perovskite (structure) , chemical engineering , open circuit voltage , crystal (programming language) , perovskite solar cell , photovoltaic system , crystal structure , nanotechnology , optoelectronics , voltage , crystallography , layer (electronics) , chemistry , ecology , physics , quantum mechanics , computer science , engineering , biology , programming language
Triple cation perovskites (Cs 0.05 (MA 0.17 FA 0.83 ) 0.95 Pb(I 0.83 Br 0.17 ) 3 ) have received lots of attention owing to the excellent stability and photovoltaic performance. However, the development toward efficient solar cells has been significantly impeded by its intrinsic precursor instability, as well as defective crystal surface. Herein, a strategy for introducing the additive of 1,4,7,10,13,16‐hexaoxacyclooctadecane (18C6) in the precursor solution, rendering an excellent stability of more than one month, and the defect passivation effect on the crystal surface are demonstrated. In those perovskite solar cells, a power conversion efficiency of 20.73% has been achieved with a substantially improved open‐circuit voltage and fill factor. As evidenced by the density functional theory calculations, the fundamental reason relating to the enhanced performance is found to be the interaction effect between the 18C6 and cations, and in particular the formation of the 18C6/Pb complex. This finding represents an alternative strategy for achieving a stable precursor solution and efficient perovskite solar cells.