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) Å, c = 18.879(4) Å), synthesized by a solid-state method. The compound exhibits a band gap of Eg â 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.
|Original language||English (US)|
|Number of pages||6|
|Journal||Journal of the American Chemical Society|
|State||Published - Sep 5 2018|
ASJC Scopus subject areas
- Colloid and Surface Chemistry
FingerprintDive into the research topics of 'Cs2PbI2Cl2, All-Inorganic Two-Dimensional Ruddlesden-Popper Mixed Halide Perovskite with Optoelectronic Response'. Together they form a unique fingerprint.
CSD 1870250: Experimental Crystal Structure Determination
Li, J. (Contributor), Yu, Q. (Contributor), He, Y. (Contributor), Stoumpos, C. C. (Contributor), Niu, G. (Contributor), Trimarchi, G. G. (Contributor), Guo, H. (Contributor), Dong, G. (Contributor), Wang, D. (Contributor), Wang, L. (Contributor) & Kanatzidis, M. (Contributor), FIZ Karlsruhe - Leibniz Institute for Information Infrastructure, 2018
DOI: 10.25505/fiz.icsd.cc20s4nm, http://www.ccdc.cam.ac.uk/services/structure_request?id=doi:10.25505/fiz.icsd.cc20s4nm&sid=DataCite