期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 140, 期 35, 页码 11085-11090出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.8b06046
关键词
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资金
- Department of Energy, Office of Science, Basic Energy Sciences [SC0012541]
- National Natural Science Foundation of China [91433205, 21673123]
- Ministry of Science and Technology of China [2015CB655002]
- Joint Educational Ph.D. Program of Chinese Scholarship Council (CSC)
The two-dimensional Ruddlesden-Popper (RP) phases are an important class of halide perovskites with versatile optoelectronic properties. So far, only organic-inorganic hybrid RP phases involving long organic spacers were reported in this class. Here, we report an all-inorganic RP phase lead halide perovskite, Cs2PbI2Cl2 (1, I4/mmm space group; a = 5.6385(8) angstrom, c = 18.879(4) angstrom), synthesized by a solid-state method. The compound exhibits a band gap of E-g similar to 3.04 eV and photoconductivity. We find an anomalous band gap evolution in Cs2Pb1-xSnxI2Cl2 solid solutions. Our combined density functional theory and experimental study supports the thermodynamically stable nature of 1 as a unique ordered phase in the Cs2PbX4 (X = Cl, Br, I) system. The calculations suggest that 1 is a direct bandgap semiconductor with relatively small effective carrier mass along the in-plane direction, consistent with the experimentally observed in-plane UV-light photoresponse. We also demonstrate that 1 is promising for radiation detection capable of alpha-particle counting. Moreover, 1 shows markedly ambient and thermal stability.
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