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Improving Photovoltaic Performance of Pb‐Less Halide Perovskite Solar Cells by Incorporating Bulky Phenylethylammonium Cations
Author(s) -
Thrithamarassery Gangadharan Deepak,
Li Pandeng,
Zhang Qingzhe,
Yang Fan,
Izquierdo Ricardo,
Sun Baoquan,
Ma Dongling
Publication year - 2021
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.202100176
Subject(s) - halide , perovskite (structure) , photoluminescence , tin , materials science , x ray photoelectron spectroscopy , photovoltaic system , recombination , limiting , inorganic chemistry , chemical engineering , crystallography , chemistry , optoelectronics , metallurgy , mechanical engineering , ecology , biochemistry , gene , engineering , biology
Alloyed tin–lead (Sn–Pb) perovskite solar cells (PSCs) exhibit a broader photoresponse up to 1050 nm; however, their efficiency is inferior to that of Pb analogs. Trap‐assisted recombination associated with Sn vacancies formed through Sn 2+ oxidation is a major detrimental factor, limiting their efficiency. By incorporating bulkier phenylethylammonium (PEA) cations into Sn–Pb alloyed perovskites, the nonradiative recombination by lowering the number of defects associated with Sn vacancies is reduced. Herein, the effects of PEA cations in different Sn–Pb halide perovskite compositions with a series of characterizations, such as photoluminescence, X‐ray photoelectron spectroscopy, and surface potential measurements, are investigated. As a result of the reduction of traps in PEA‐containing perovskites, a significant improvement of 40% and 15% in photovoltaic performance is observed for Sn‐rich and Pb‐rich Sn–Pb halide perovskites, respectively.