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Laminar MAPbBr3/MAPbBr3-xIx graded heterojunction single crystal for enhancing charge extraction and optoelectronic performance

Abstract

Halide perovskite single crystal (SC) has recently been regarded as promising candidate in optoelectronic devices by virtue of the remarkable intrinsic properties. Herein, the laminar MAPbBr3/MAPbBr3-xIx (MA = CH3NH3+) graded heterojunction single crystal (GHSC) with a thickness of about 11 μm and an area of 4 × 5 mm has been synthesized via space-limited inverse temperature crystallization growth method and gaseous halide exchange process in sequence. Compared to the pristine MAPbBr3 SC, such MAPbBr3/MAPbBr3-xIx GHSC possesses a graded valence band alignment by halide gradient distribution, which significantly enhances the hole extraction and accelerates carrier transport, leading to a high-performance perovskite SC photodetector with an improved external quantum efficiency of ≈170% at −2 V and an impressively rapid response speed of 0.56 μs. Our results provide a promising strategy to solve the incisive contradiction between carrier diffusion length and crystal thickness, which opens the potential optoelectronic applications of laminar heterojunction SCs.

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Publication details

The article was received on 19 Feb 2019, accepted on 15 Apr 2019 and first published on 16 Apr 2019


Article type: Paper
DOI: 10.1039/C9TC00972H
Citation: J. Mater. Chem. C, 2019, Accepted Manuscript

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    Laminar MAPbBr3/MAPbBr3-xIx graded heterojunction single crystal for enhancing charge extraction and optoelectronic performance

    W. Li, X. Wang, J. Liao, Z. Wei, Y. Xu, H. Chen and D. Kuang, J. Mater. Chem. C, 2019, Accepted Manuscript , DOI: 10.1039/C9TC00972H

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