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journal article·2024-05-06Open access

FA4Pb2I7.5(SCN)0.5: n = 3 Member of Perovskite Homologous Series FAn+1Pbn−1I3n−1.5(SCN)0.5 with Columnar Defects

Takuya Ohmi, James R. Neilson, Wataru Taniguchi, Tomoya Fukui, Teppei Nagase, Yuki Haruta, Makhsud I. Saidaminov, Takanori Fukushima, Masaki Azuma, Takafumi Yamamoto

ACS Materials Letters· Volume 6· Issue 5
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Abstract

High Resolution Image Download MS PowerPoint Slide Hybrid organic–inorganic halide perovskites are an emerging class of optoelectronic materials. Among them, there are many homologous series of Ruddlesden–Popper and Dion–Jacobson layered perovskites reported, but a homologous series based on defect ordering has not yet been discovered. Here, by using thiocyanate anion as a defect generator, we successfully synthesized a new defect-ordered perovskite FA 4 Pb 2 I 7.5 (SCN) 0.5 together with the previously reported FA 6 Pb 4 I 13.5 (SCN) 0.5 . These compounds can be represented respectively as n = 3 and n = 5 members of the perovskite homologous series FA n +1 Pb n −1 I 3 n −1.5 (SCN) 0.5 with ordered columnar defects, which is the first homologous series of defect-ordered hybrid perovskites. The optical band gap increases with an increase in the ordered defects in the lattice. FA 4 Pb 2 I 7.5 (SCN) 0.5 ( n = 3) exhibits photoluminescence emission, which is a feature of layered perovskites with a quantum-well structure. This study provides a new strategy to control the defect orderings for tuning their optical properties by incorporating thiocyanate.
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Research context

Electronic materials

OpenAlex topics: Perovskite Materials and Applications · Solid-state spectroscopy and crystallography · Crystal Structures and Properties

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Laboratory for Materials and Structures, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama, Kanagawa 226-8501, Japan

Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523-1872, United States

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

Department of Chemistry, University of Victoria, Victoria, British Columbia V8P 5C2, Canada

Living Systems Materialogy (LiSM) Research Group, International Research Frontiers Initiative (IRFI), Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama, Kanagawa 226-8501, Japan

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

Funding

Ministry of Education, Culture, Sports, Science and Technology · Japan Society for the Promotion of Science · Office of Science

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