Hybrid Optical-Electrical Perovskite Can Be a Ferroelastic Semiconductor

Abstract

Organic–inorganic hybrid perovskites (OIHPs) have been a hot research topic due to their advanced structural and functional features that cover almost all the research fields of intelligent materials including ferroelectric, photovoltaic, fluorescent, and dielectric. However, the development of the construction of an OIHP ferroelastic semiconductor with optical-electrical response has been a huge challenge and infrequently reported. In this work, a rare and interesting hybrid perovskite ferroelastic semiconductor, [BFDA]PbBr3 (BFDA = benzyl-(2-fluoro-ethyl)-dimethyl-ammonium), was synthesized, which benefits from the structural advantage of a long tail BFDA to be balanced by the suitable inorganic framework. [BFDA]PbBr3 shows a high-temperature ferroelastic phase transition at 365 K and a direct band gap of 3.33 eV. In addition, it can emit charming orange-pink light under a 365 nm UV lamp. To combine this with the ferroelastic, optical, and dielectric properties, [BFDA]PbBr3 can be identified as a very rarely reported ferroelastic semiconductor. The above-mentioned synthesis strategy is also helpful for the enrichment and development of the hybrid perovskite family.