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Title: Cs 2PbI2Cl2, All-Inorganic Two-Dimensional Ruddlesden–Popper Mixed Halide Perovskite with Optoelectronic Response

Journal Article · · Journal of the American Chemical Society
DOI:https://doi.org/10.1021/jacs.8b06046· OSTI ID:1599732

The two-dimensional Ruddlesden–Popper (RP) phases are a prime 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. Herein, we discuss an all-inorganic RP phase lead halide perovskite, Cs2PbI2Cl2 (1, I4/mmm space group; a = 5.6385(8) Å, c = 18.879(4) Å), synthesized by a solid-state method. The compound exhibits a band gap of Eg ~ 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 α-particle counting. Moreover, 1 shows markedly ambient and thermal stability.

Research Organization:
Univ. of California, Santa Barbara, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; National Natural Science Foundation of China (NSFC); Ministry of Science and Technology of China; Chinese Scholarship Council (CSC)
Grant/Contract Number:
SC0012541; 2015CB655002
OSTI ID:
1599732
Journal Information:
Journal of the American Chemical Society, Vol. 140, Issue 35; ISSN 0002-7863
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 122 works
Citation information provided by
Web of Science

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