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Cesium Lead Inorganic Solar Cell with Efficiency beyond 18% via Reduced Charge Recombination
Author(s) -
Ye Qiufeng,
Zhao Yang,
Mu Shaiqiang,
Ma Fei,
Gao Feng,
Chu Zema,
Yin Zhigang,
Gao Pingqi,
Zhang Xingwang,
You Jingbi
Publication year - 2019
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.201905143
Subject(s) - materials science , lead chloride , energy conversion efficiency , passivation , crystallinity , band gap , caesium , perovskite (structure) , recombination , perovskite solar cell , optoelectronics , lithium fluoride , open circuit voltage , solar cell , analytical chemistry (journal) , chemical engineering , chloride , inorganic chemistry , layer (electronics) , nanotechnology , voltage , biochemistry , chemistry , physics , quantum mechanics , gene , chromatography , engineering , metallurgy , composite material
Cesium‐based inorganic perovskite solar cells (PSCs) are promising due to their potential for improving device stability. However, the power conversion efficiency of the inorganic PSCs is still low compared with the hybrid PSCs due to the large open‐circuit voltage ( V OC ) loss possibly caused by charge recombination. The use of an insulated shunt‐blocking layer lithium fluoride on electron transport layer SnO 2 for better energy level alignment with the conduction band minimum of the CsPbI 3‐ x Br x and also for interface defect passivation is reported. In addition, by incorporating lead chloride in CsPbI 3‐ x Br x precursor, the perovskite film crystallinity is significantly enhanced and the charge recombination in perovksite is suppressed. As a result, optimized CsPbI 3‐ x Br x PSCs with a band gap of 1.77 eV exhibit excellent performance with the best V OC as high as 1.25 V and an efficiency of 18.64%. Meanwhile, a high photostability with a less than 6% efficiency drop is achieved for CsPbI 3‐ x Br x PSCs under continuous 1 sun equivalent illumination over 1000 h.