Design, synthesis, and characterization of a new hybrid organic-inorganic perovskite with a high- T c dielectric transition.

Phase change materials (PCMs) have drawn increasing attention for their promising applications in thermal switches, data communication, and energy storage. Because of the complexity of the interactions between molecules, it is still a challenge to design PCMs with a desired high phase transition temperature ( T c ). In this study, a one-dimensional hybrid perovskite of (TEACCl)PbBr 3 (1, TEACCl = Et 3 NCH 2 Cl) was successfully designed and synthesized with a T c = 390 K. Disordering of TEACCl + on the heating process is the origin of the structural phase transition of 1 from the P 2 1 / c to P 6 3 / mmc structure. It is noted that the phase transition is associated with an excellent switchable dielectric property, which indicates that 1 has the potential to be applied to sensor equipment. After calculation, 1 is an infrequent indirect bandgap semiconductor with an energy gap of 3.57 eV. Moreover, 1 exhibits strong red fluorescence under irradiation of UV light. This work will provide guidance for designing high T c switching materials.