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Tailoring C 60 for Efficient Inorganic CsPbI 2 Br Perovskite Solar Cells and Modules
Author(s) -
Liu Chong,
Yang Yuzhao,
Zhang Cuiling,
Wu Shaohang,
Wei Liyu,
Guo Fei,
Arumugam Gowri Manohari,
Hu Jinlong,
Liu Xingyuan,
Lin Jie,
Schropp Ruud E. I.,
Mai Yaohua
Publication year - 2020
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201907361
Subject(s) - materials science , homo/lumo , perovskite (structure) , energy conversion efficiency , dopant , perovskite solar cell , borane , photovoltaics , chemical engineering , nanotechnology , optoelectronics , doping , photovoltaic system , organic chemistry , catalysis , chemistry , ecology , molecule , engineering , biology
Although inorganic perovskite solar cells (PSCs) are promising in thermal stability, their large open‐circuit voltage ( V OC ) deficit and difficulty in large‐area preparation still limit their development toward commercialization. The present work tailors C 60 via a codoping strategy to construct an efficient electron‐transporting layer (ETL), leading to a significant improvement in V OC of the inverted inorganic CsPbI 2 Br PSC. Specifically, tris(pentafluorophenyl)borane (TPFPB) is introduced as a dopant to lower the lowest unoccupied molecular orbital (LUMO) level of the C 60 layer by forming a Lewis acidic adduct. The enlarged free energy difference provides a favorable enhancement in electron injection and thereby reduces charge recombination. Subsequently, a nonhygroscopic lithium salt (LiClO 4 ) is added to increase electron mobility and conductivity of the film, leading to a reduction in the device hysteresis and facilitating the fabrication of a large‐area device. Finally, the as‐optimized inorganic CsPbI 2 Br PSCs gain a champion power conversion efficiency (PCE) of 15.19%, with a stabilized power output (SPO) of 14.21% (0.09 cm 2 ). More importantly, this work also demonstrates a record PCE of 14.44% for large‐area inorganic CsPbI 2 Br PSCs (1.0 cm 2 ) and reports the first inorganic perovskite solar module with the excellent efficiency exceeding 12% (10.92 cm 2 ) by a self‐developed quasi‐curved heating method.