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Title
Japanese: 
English:FA4Pb2I7.5(SCN)0.5: n = 3 Member of Perovskite Homologous Series FAn+1Pbn–1I3n–1.5(SCN)0.5 with Columnar Defects 
Author
Japanese: T. Ohmi, J. R. Neilson, W. Taniguchi, 福井 智也, T. Nagase, Y. Haruta, M. I. Saidaminov, 福島 孝典, M. Azuma, T. Yamamoto.  
English: T. Ohmi, J. R. Neilson, W. Taniguchi, T. Fukui, T. Nagase, Y. Haruta, M. I. Saidaminov, T. Fukushima, M. Azuma, T. Yamamoto.  
Language English 
Journal/Book name
Japanese: 
English:ACS MATERIALS LETTERS 
Volume, Number, Page Volume 6    Number 5    Page 1913–1919
Published date Apr. 16, 2024 
Publisher
Japanese: 
English: 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
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Official URL https://pubs.acs.org/doi/10.1021/acsmaterialslett.3c01514
 
DOI https://doi.org/10.1021/acsmaterialslett.3c01514
Abstract 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 FA4Pb2I7.5(SCN)0.5 together with the previously reported FA6Pb4I13.5(SCN)0.5. These compounds can be represented respectively as n = 3 and n = 5 members of the perovskite homologous series FAn+1Pbn−1I3n−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. FA4Pb2I7.5(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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