Tunable optical properties in the (110)p-oriented layered halide perovskite FA4Pb2I7.5(SCN)0.5 by Br substitution

Koki Matsushima; Takuya Ohmi; Wataru Taniguchi; Shoya Nagano; Tomoya Fukui; Takanori Fukushima; Muhammad Awais; Makhsud Saidaminov; Masaki Azuma; Takafumi Yamamoto

doi:10.1039/D5DT02441B

Tunable optical properties in the (110)_p-oriented layered halide perovskite FA₄Pb₂I_7.5(SCN)_0.5 by Br substitution

Koki Matsushima,

^ab Takuya Ohmi,

^bcd Wataru Taniguchi,^b Shoya Nagano,^b Tomoya Fukui,^ef Takanori Fukushima,

^ef Muhammad Awais,^d Makhsud Saidaminov,

^d Masaki Azuma

^bfg and Takafumi Yamamoto

*^ab

Author affiliations

* Corresponding authors

^a Department of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa Oiwake-cho, Sakyoku, Kyoto, Japan
E-mail: yama@kuchem.kyoto-u.ac.jp

^b Materials and Structures Laboratory, Institute of Integrated Research, Institute of Science Tokyo, 4259 Nagatsuta-cho, Midori-ku, Yokohama, Kanagawa, Japan

^c Advanced Phosphor Group, Research Center for Electronic and Optical Materials, National Institute for Materials Science (NIMS), 1-1, Namiki, Tsukuba 305-0044, Japan

^d Department of Electrical & Computer Engineering, University of Victoria, 3800 Finnerty Road, Victoria, British Columbia V8P 5C2, Canada

^e Laboratory for Chemistry and Life Science, Institute of Innovative Research, Institute of Science Tokyo, 4259 Nagatsuta-cho, Midori-ku, Yokohama, Kanagawa 226-8501, Japan

^f Research Center for Autonomous Systems Materialogy (ASMat), Institute of Integrated Research, Institute of Science Tokyo, 4259 Nagatsuta-cho, Midori-ku, Yokohama, Kanagawa, Japan

^g Kanagawa Institute of Industrial Science and Technology, 705-1 Shimoimaizumi, Ebina 243-0435, Japan

Abstract

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(Br_xI_1−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.

This article is part of the themed collection: Spotlight Collection: Mixed-Anion Compounds

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Tunable optical properties in the (110)_p-oriented layered halide perovskite FA₄Pb₂I_7.5(SCN)_0.5 by Br substitution

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Tunable optical properties in the (110)_p-oriented layered halide perovskite FA₄Pb₂I_7.5(SCN)_0.5 by Br substitution

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