Open AccessStable Bandgap-Tunable Hybrid Perovskites with Alloyed Pb–Ba Cations for High-Performance Photovoltaic Applications
Author(s) -
Minghui Shang,
Jing Zhang,
Peng Zhang,
Zuobao Yang,
Jinju Zheng,
Md Azimul Haque,
Weiyou Yang,
SuHuai Wei,
Tom Wu
Publication year - 2018
Publication title -
the journal of physical chemistry letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.563
H-Index - 203
ISSN - 1948-7185
DOI - 10.1021/acs.jpclett.8b03352
Subject(s) - materials science , perovskite (structure) , photovoltaic system , band gap , energy conversion efficiency , phase (matter) , metal , chemical engineering , optoelectronics , nanotechnology , metallurgy , chemistry , ecology , organic chemistry , engineering , biology
The intrinsic poor stability of MAPbI 3 hybrid perovskites in the ambient environment remains as the major challenge for photovoltaic applications. In this work, complementary first-principles calculations and experimental characterizations reveal that metal cation alloyed perovskite (MABa x Pb 1- x I 3 ) can be synthesized and exhibit substantially enhanced stability via forming stronger Ba-I bonds. The Ba-Pb alloyed perovskites remain phase-pure in ambient air for more than 15 days. Furthermore, the bandgap of MABa x Pb 1- x I 3 is tailored in a wide window of 1.56-4.08 eV. Finally, MABa x Pb 1- x I 3 is used as a capping layer on MAPbI 3 in solar cells, resulting in significantly improved power conversion efficiency (18.9%) and long-term stability (>30 days). Overall, our results provide a simple but reliable strategy toward stable less-Pb perovskites with tailored physical properties.
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