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Fabrication and Characterization of FA x Cs 1− x PbI 3 Polycrystal Perovskite Solar Cells
Author(s) -
Gao Caiyun,
Shao Zhipeng,
Sun Xiuhong,
Li Zhipeng,
Rao Yi,
Lv Peiliang,
Wei Yijin,
Chen Chen,
Liu Dachang,
Wang Xiao,
Sun Mingliang,
Cui Guanglei,
Pang Shuping
Publication year - 2021
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.202100166
Subject(s) - perovskite (structure) , materials science , tetragonal crystal system , energy conversion efficiency , fabrication , band gap , phase (matter) , doping , analytical chemistry (journal) , nanotechnology , crystallography , optoelectronics , chemistry , medicine , alternative medicine , organic chemistry , pathology , chromatography
FA x Cs 1− x PbI 3 perovskites were considered promising candidates to accomplish the goals of high photoelectric conversion efficiency with great stability. Limited by the phase separation during fabrication through the conventional one‐step method, the FA x Cs 1− x PbI 3 perovskites with the x ratio lower than 0.7 were barely studied. Herein, the full‐scale mixed cation‐doped FA x Cs 1− x PbI 3 perovskites are synthesized and studied. The bandgap of FA x Cs 1− x PbI 3 perovskites gradually decreases from 1.69 to 1.58 eV with x increasing from 0.15 to 0.75, along with phase structure changes from tetragonal (β) to cubic (α). Under humidity or UV irradiation, the FA x Cs 1− x PbI 3 perovskites phase separates to FA 0.92 Cs 0.08 PbI 3 perovskite and δ‐CsPbI 3 . The FA 0.60 Cs 0.40 PbI 3 perovskite solar cells exhibit more stable efficiency, the champion device reaches a power conversion efficiency of 20.40%. Meanwhile, the unencapsulated devices keep 90% of the initial efficiency when stored in air for 30 days, showing the potential for high stability photovoltaic devices.