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Formamidinium-methylammonium lead iodide perovskite single crystal exhibits exceptional optoelectronic properties and long-term stability

Abstract

Halide perovskite single crystal of cubic HC(NH2)2PbI3 (FAPbI3) coming with excellent optoelectronic properties of narrow bandgap, large absorption coefficient and superior thermal stability has caught a surge of attention as promising high-performance optoelectronic devices. However, at room temperature, the self-transformation of cubic FAPbI3 perovskite phase to non-perovskite phase leaves a critical roadblock to the practical viability. Herein, a simple alloying strategy by mixing methylammonium with formamidinium is developed to stabilize the FAPbI3 perovskite phase and hence achieves a highly stable mixed cation MA0.45FA0.55PbI3 perovskite single crystal over 14 months. The MA0.45FA0.55PbI3 single crystal exhibits exceptional optoelectronic properties like high carrier mobility of 271 ± 60 cm2 s-1 V-1 and long diffusion length up to 254 μm, which are double of the values for sole MAPbI3 or FAPbI3 crystals. Additionally, the photodetector based on MA0.45FA0.55PbI3 single crystal exhibits low detection limit down to 1 nW cm-2, high ON-OFF ratio of 1000, short response time of less than 200 s, and impressive stability under aging in dark for 4 months or continueous photo-switching test for 1000 s.

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Publication details

The article was received on 26 May 2017, accepted on 07 Aug 2017 and first published on 08 Aug 2017


Article type: Paper
DOI: 10.1039/C7TA04608A
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Formamidinium-methylammonium lead iodide perovskite single crystal exhibits exceptional optoelectronic properties and long-term stability

    W. Li, H. Rao, B. Chen, X. Wang and D. Kuang, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA04608A

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