期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 10, 期 1, 页码 59-66出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.8b03352
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资金
- 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
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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