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Ion Migration Accelerated Reaction between Oxygen and Metal Halide Perovskites in Light and Its Suppression by Cesium Incorporation
Author(s) -
Lin Dongxu,
Shi Tingting,
Xie Haipeng,
Wan Fang,
Ren Xiaoxue,
Liu Kai,
Zhao Yuan,
Ke Lili,
Lin Yun,
Gao Yongli,
Xu Xin,
Xie Weiguang,
Liu Pengyi,
Yuan Yongbo
Publication year - 2021
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.202002552
Subject(s) - materials science , perovskite (structure) , halide , oxygen , ion , caesium , inorganic chemistry , degradation (telecommunications) , chemical engineering , photochemistry , chemistry , telecommunications , organic chemistry , computer science , engineering
Organic‐inorganic hybrid perovskite solar cells are susceptible to multiple influencing factors such as moisture, oxygen, heat stress, ion migration. Given the complex practical working conditions for solar cells, a fundamental question is how different failure mechanisms collaborate and substantially accelerate the device degradation. In this study, it is found that ion migration can accelerate the reaction between oxygen and methylammonium lead iodide perovskite in light conditions. This is suggested since regions with local electric fields suffer from more severe decomposition. Here it is reported that cesium ions (Cs + ) incorporated in perovskite lattice, with a moderate doping concentration (e.g. 5%), can function as stabilizers to efficiently interrupt such a synergistic effect between oxygen induced degradation and ion migration while retaining the high performance of perovskite solar cells. Both experimental and theoretical results suggest that 5% Cs + ions incorporation simultaneously suppresses the formation of reactive superoxide ions ( O 2 − ) as well as ion migration in perovskites by forming additional energy barriers. This A‐site cations engineering is also a promising strategy to circumvent the detrimental effect of oxygen molecules in FA‐based perovskites, which is important for developing high‐efficiency perovskite solar cells with enhanced stability.