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Controlled n‐Doping in Air‐Stable CsPbI 2 Br Perovskite Solar Cells with a Record Efficiency of 16.79%
Author(s) -
Han Yu,
Zhao Huan,
Duan Chenyang,
Yang Shaomin,
Yang Zhou,
Liu Zhike,
Liu Shengzhong Frank
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.201909972
Subject(s) - materials science , doping , passivation , energy conversion efficiency , perovskite (structure) , crystallinity , thermal stability , caesium , chemical engineering , open circuit voltage , optoelectronics , nanotechnology , inorganic chemistry , voltage , composite material , electrical engineering , chemistry , layer (electronics) , engineering
Cesium‐based inorganic perovskites, such as CsPbI 2 Br, are promising candidates for photovoltaic applications owing to their exceptional optoelectronic properties and outstanding thermal stability. However, the power conversion efficiency of CsPbI 2 Br perovskite solar cells (PSCs) is still lower than those of hybrid PSCs and inorganic CsPbI 3 PSCs. In this work, passivation and n‐type doping by adding CaCl 2 to CsPbI 2 Br is demonstrated. The crystallinity of the CsPbI 2 Br perovskite film is enhanced, and the trap density is suppressed after adding CaCl 2 . In addition, the Fermi level of the CsPbI 2 Br is changed by the added CaCl 2 to show heavy n‐type doping. As a result, the optimized CsPbI 2 Br PSC shows a highest open circuit voltage of 1.32 V and a record efficiency of 16.79%. Meanwhile, high air stability is demonstrated for a CsPbI 2 Br PSC with 90% of the initial efficiency remaining after more than 1000 h aging in air.
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