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Tunable optical properties in the (110)p-oriented layered halide perovskite FA4Pb2I7.5(SCN)0.5 by Br substitution
Koki Matsushima1,2, Takuya Ohmi2,3,4, Wataru Taniguchi2
1Department of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa Oiwake-cho, Sakyoku, Kyoto, 606-8502, Japan. yama@kuchem.kyoto-u.ac.jp.
None:
Organic-inorganic hybrid halide perovskites have been explored extensively for optoelectronic functional materials. Here, we report (110)p-oriented layered halide perovskite thin films with nominal compositions of FA4Pb2(BrxI1-x)7.5(SCN)0.5 (x = 0, 0.25, 0.5, 0.75, and 1). X-ray diffraction measurements and UV-visible diffuse reflectance measurements demonstrate the successful formation of a solid solution between iodide and bromide. The band gap gradually changes from 2.18 eV to 2.81 eV with increasing Br content, and PL emission of 750 nm was observed for the x = 0 film. We also report a single crystal sample of x = 1.
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