Two-Dimensional Organic–Inorganic Hybrid Materials with Dielectric Switching and Photoluminescence Properties

Layered 2D organic–inorganic halide perovskites have attracted comprehensive scientific attention due to their excellent dielectric, ferroelectric, and photophysical properties. However, most of the reported crystal compounds only possess a single performance. Here, we report two new layered 2D organic–inorganic halide perovskites: [BA-PbBr4] (Prv-1) and [MACH-PbI4] (Prv-2) (BA = 1-butylamine, MACH = cyclohexanemethylamine). Both compounds (with crystal structures) show switchable phase transitions at 390 and 350 K, respectively. Shockingly, [MACH-PbI4] reveals a high photoluminescence quantum yield of up to 16.3% with the replacement of the halogen and organic cation (Br → I, BA → MACH). In addition, the experimental data and calculated results suggest that both compounds could be used as band gap semiconductors. In brief, this work might provide new strategies for the exploration of dielectric and ferroelectric functional materials.