Bromine-Substitution-Induced High-Tc Two-Dimensional Bilayered Perovskite Photoferroelectric

• DOI: 10.1021/jacs.1c00459
• Publication Date: 2021-05-17T16:18:41Z
• Authors: Zhenyue Wu; Weichuan Zhang; Huang Ye; Yunpeng Yao; Xitao Liu; Lina Li; Chengmin Ji; Junhua Luo
• Keywords: Formamidinium; Photoelectric effect

High-Curie-temperature (Tc) ferroelectrics have exhibited broad applications in optoelectronic devices. Recently, two-dimensional multilayered perovskite with excellent photoelectric attributes are attracting increasing interest as new systems of photoferroelectrics. However, the effective tuning Tc value a photoferroelectric system still remains huge challenge. Here, by halogen substitution strategy to introduce bromine atoms on n-propylamine cations, hybrid (3-bromopropylaminium)2(formamidinium)Pb2Br7 (BFPB) high (348.5 K) was obtained. It is notable that BFPB adopts bilayered inorganic framework, tight linking organic cation C–Br···Br–Pb halogen···halogen interactions and N–H···Br hydrogen bonds. Intriguingly, comparison prototypical compound (n-propylaminium)2(formamidinium)Pb2Br7, remarkable augmentation 85.2 K resulting clearly observed, which further broadens temperature range its application. In combination ferroelectric semiconducting attributes, reversible bulk photovoltaic effect realized single crystals BFPB. This finding can not only enhance family but also promote application ferroelectrics.