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Abstract
Formamidinium lead iodide FAPbI3 (FA+ = CH(NH2)2+) with a cubic perovskite structure is among the most-studied or-ganic-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 the bandgap tuning among FA-Pb-I compositions. This study presents a novel approach to controlling the structural dimensionality of perov-skites and their optical properties.
Supplementary materials
Title
Supporting Information
Description
Experimental Section; Figures of photographs of the samples, profile of the Le Bail refinement, crystal structures of FA2PbI4 and FA3PbI5 δ-FAPbI3, diffraction flames of the single crystal XRD and Tauc plots for diffuse-reflectance spectra; tables of crystallographic parameters of Le Bail refinement and single crystal XRD refinement and estimated bandgaps from Tauc plots.
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