Novel One-Dimensional Organic–Inorganic Hybrid Halide Perovskite Material with Coexistence of High Phase Transition Temperature and Corresponding Dielectric Response

Organic–inorganic hybrid perovskite materials have attracted much attention because they combine the advantages of the organic and inorganic components at the molecular level. Organic–inorganic hybrid materials have both the structural variability and the flexibility of organic components, as well as magnetic, electrical, and thermal properties of inorganic components. A novel one-dimensional organic–inorganic hybrid halide perovskite material [Et₃NCH₂Br][PbBr₃] (compound 1) undergoes a high-temperature phase transition at around 429.3 K, which is triggered by the order–disorder change of cations. Differential scanning calorimetry, a dielectric test, and single-crystal X-ray diffraction indicate that compound 1 exhibits structural phase transition from the P2₁/c to P6₃/m space group and a prominent dielectric anomaly. Strikingly, the bandgap of compound 1 is 3.12 eV. It is believed that our findings will contribute to an alternative pathway for the design of multifunctional materials.