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.

Keywords

organic--inorganic halide perovskite / one-dimensional / microwire / cation reaction / memory device

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Acknowledgements

This work was supported by the National Key Research and Development Program of China (Grant No. 2018YFB0406704), the National Natural Science Foundation of China (Grant No. 61964011), the Natural Science Foundation of Jiangxi Province (Grant Nos. 20165BCB18004 and 20171BCB23005), and the Nanchang University Graduate Innovation Special Funding (Grant No. CX2019054).

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