Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 10, Issue 1, Pages 59-66Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.8b03352
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Funding
- National Natural Science Foundation of China (NSFC) [11547033, 51302137]
- Zhejiang Provincial Natural Science Foundation of China [LY18F040008]
- Natural Science Foundation of Ningbo Municipal Government [2015A610032, 2016A610108]
- Foundation of Education bureau of Zhejiang Province [Y201533502]
- National Key Research and Development Program of China [2016YFB0700700]
- NSAF joint program [U1530401]
- Scientific Research Foundation for Returned Overseas Chinese Scholars
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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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