A formamidinium–methylammonium lead iodide perovskite single crystal exhibiting exceptional optoelectronic properties and long-term stability
| Autor: | Bai-Xue Chen, Hua-Shang Rao, Xudong Wang, Wen-Guang Li, Dai-Bin Kuang |
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| Rok vydání: | 2017 |
| Předmět: |
Electron mobility
Materials science Renewable Energy Sustainability and the Environment business.industry Band gap 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Formamidinium Phase (matter) Attenuation coefficient Optoelectronics General Materials Science Thermal stability 0210 nano-technology business Single crystal Perovskite (structure) |
| Zdroj: | Journal of Materials Chemistry A. 5:19431-19438 |
| ISSN: | 2050-7496 2050-7488 |
| DOI: | 10.1039/c7ta04608a |
| Popis: | Halide perovskite single crystal of cubic HC(NH2)2PbI3 (FAPbI3) having excellent optoelectronic properties, such as narrow bandgap, large absorption coefficient and superior thermal stability has caught a surge of attention as a promising material for production of 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 its practical viability. Herein, a simple alloying strategy by mixing methylammonium with formamidinium is developed to stabilize the FAPbI3 perovskite phase, hence achieving a highly stable mixed cation MA0.45FA0.55PbI3 perovskite single crystal over a span of 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 twice the values for sole MAPbI3 or FAPbI3 crystals. In addition, the photodetector based on MA0.45FA0.55PbI3 single crystal exhibits low detection limit of about 1 nW cm−2, high ON–OFF ratio of ∼1000, short response time of less than 200 μs, and impressive stability under aging in dark for 4 months or continuous photo-switching test for 1000 s. |
| Databáze: | OpenAIRE |
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