Publication date: 3rd June 2020
Understanding the optical and electrical properties of halide perovskites has enabled the fabrication of high-efficiency optoelectronic devices. Here we develop an antisolvent-assisted solvent acidolysis crystallization (AA-SAC) to prepare high-quality methylammonium lead bromide (MAPbBr3) single crystals by fine-tuning the crystal nucleation and growth processes at room temperature. The crystals show intense edge emission under ultraviolet light excitation. We study structural variation at the crystal edge and center using micro-X-ray diffraction, and from these studies conclude that the enhanced edge emission is attributable to lattice compression, in combination with close to stoichiometric Br:Pb composition. Macro- and micro-photoluminescence, as well as Raman spectroscopy, also show structural changes at the crystal edge compared to the center; while time-resolved PL measurements show long-lived photogenerated carriers at the compressed edge, with lifetimes of ~1 s, seven times longer than at the unstrained center. We exploit the superior optoelectronic properties of the crystal edge to fabricate planar photodetectors exhibiting detectivities of 2.8 × 1013 cm Hz1/2 W−1 (Jones) and a responsivity of 84 A W−1.
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