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Title
Japanese: 
English:Dimensionality Reduction of Formamidinium-Rich Lead Iodide Perovskite-Derived Structures 
Author
Japanese: T. Ohmi, W. Taniguchi, Bhawna, 福井 智也, Y. Haruta, T. Nakanishi, 福島 孝典, M. I. Saidaminov, M. Azuma, T. Yamamoto.  
English: T. Ohmi, W. Taniguchi, Bhawna, T. Fukui, Y. Haruta, T. Nakanishi, T. Fukushima, M. I. Saidaminov, M. Azuma, T. Yamamoto.  
Language English 
Journal/Book name
Japanese: 
English:Journal of the American Chemical Society 
Volume, Number, Page Volume 148    Issue 3    Page 2858–2863
Published date Jan. 13, 2026 
Publisher
Japanese: 
English: 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
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Official URL https://pubs.acs.org/doi/10.1021/jacs.5c17829
 
DOI https://doi.org/10.1021/jacs.5c17829
Abstract Formamidinium lead iodide, FAPbI3 (FA+ = CH(NH2)2+), with a cubic perovskite structure is among the most studied organic–inorganic hybrid perovskites. Despite several reports only on thin films of FA-rich lead iodide perovskites, such as FA2PbI4, their structures remain unknown due to challenges in characterizing polycrystalline films. Here, we report two new phases of FA-rich lead iodide perovskite-derived structures, FA2PbI4 and FA3PbI5, in the bulk form. These materials feature two- and one-dimensional octahedral networks of perovskite, respectively, allowing for bandgap tuning among FA–Pb–I compositions. This study presents a novel approach to controlling the structural dimensionality of perovskites and their optical properties.

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