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Simultaneous Cesium and Acetate Coalloying Improves Efficiency and Stability of FA 0.85 MA 0.15 PbI 3 Perovskite Solar Cell with an Efficiency of 21.95%
Author(s) -
Yuan Shihao,
Cai Yuan,
Yang Shaomin,
Zhao Huan,
Qian Fang,
Han Yu,
Sun Jie,
Liu Zhike,
Liu Shengzhong Frank
Publication year - 2019
Publication title -
solar rrl
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.544
H-Index - 37
ISSN - 2367-198X
DOI - 10.1002/solr.201900220
Subject(s) - energy conversion efficiency , caesium , materials science , grain size , perovskite solar cell , photoelectric effect , ion , chemical engineering , perovskite (structure) , optoelectronics , inorganic chemistry , chemistry , composite material , organic chemistry , engineering
A simple coalloying strategy is applied to improve the efficiency and stability of FA 0.85 MA 0.15 PbI 3 perovskite solar cells (PSCs) by using cesium acetate (CsAc) as an additive. It is found that the simultaneous incorporation of cation (Cs + ) and anion (Ac − ) into the FA 0.85 MA 0.15 PbI 3 film is an effective approach to realize lattice contraction, grain size enlargement, photoelectric properties improvement, band structure modulation, and therefore the optimization of the efficiency and stability of PSCs. At optimal CsAc alloying, the FA 0.85 MA 0.15 PbI 3 PSCs achieve a maximum power conversion efficiency (PCE) of 21.95% and an average of over 21%. In addition, the alloyed PSCs retain 97% of their initial PCE values after aging for 55 days in air without encapsulation.