Methylhydrazinium Lead Bromide: Noncentrosymmetric Three-Dimensional Perovskite with Exceptionally Large Framework Distortion and Green Photoluminescence

By M. Ma̧czka, M. Ptak, A. Ga̧gor, D. Stefańska, Jan K. Zaręba, A. Sieradzki. 2020

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Three-dimensional (3D) lead halide perovskites have emerged as a promising class of coordination polymers for solar cells, photodetectors and light emitting devices. These compounds thus far comprised methylammonium, formamidinium or cesium as cations. In this work, we introduce a new methylhydrazinium 3D perovskite, CH3NH2NH2PbBr3 that crystallizes in the polar P21 structure at room temperature and undergoes a phase transition to the cubic Pm3 m phase at 418 K. This perovskite exhibits strong second-harmonic generation (SHG) activity, features switchable dielectric behavior, thermochromism as well as two-photon energy up-conversion under 800 nm excitation.

Subfields: Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/d7f782b1f0abd335b7acd0221a2dbf42b961704c