Synthesis of halide perovskite microwires via methylammonium cations reaction

Abstract

Low-dimensional halide perovskites (HPs) have received considerable attention in recent years due to their novel physical properties such as compositional flexibility, high quantum yield, quantum size effects and superior charge transport. Here we show room temperature solution synthesis of 1D organic-inorganic lead bromide perovskite microwires (MWs). Our method uses acetone as a reactant, and when CH3NH3PbBr3 is immersed, acetone reacts with CH3NH3+ cations in the CH3NH3PbBr3 single crystal by the dehydration condensation. The reaction generates a large (CH3)2C = NHCH3+ A-site which cannot be accommodated by the cuboctahedron formed by the corner-sharing [PbBr6]4− octahedral, leading to the transition of corner-sharing octahedra to face-sharing triangular prism and the crystal structure transformation from 3D to 1D. The formation process of (CH3)2C = NHCH3PbBr3 MWs does not involve any ligands, templates or catalysts. A two-terminal memory device was constructed using the (CH3)2C = NHCH3PbBr3 MWs, showing great potential of the method in fabrication of electronic and optoelectronic devices.