Recently, Han Keli, a researcher of the Complex Molecular System Reaction Dynamics Group of the Dalian Institute of Chemical Physics, Chinese Academy of Sciences, has made new progress in the study of the dynamics of all-inorganic perovskite photodetectors. The research team found that there was a rapid diffusion behavior of the carriers in the fully inorganic perovskite crystallite (CsPbBr3) excited state, and the photodetectors thus prepared had ultra-high sensitivity and fast time response. The relevant research results were published in Advanced Materials. Photodetectors play an important role in signal processing, communications, and bioimaging. At present, all-inorganic perovskite-based photodetectors cannot achieve high sensitivity and fast response at the same time. For example, the CsPbBr3 perovskite film has a high trap state density, while the charge collection efficiency of a single-crystal photodetector based on a CsPbBr3 perovskite is low. . Photodetectors based on these materials generally have low sensitivity and long response times. Low defect state density, high carrier mobility, and effective charge collection are important factors in achieving high performance photodetectors. The research team prepared organic-inorganic hybrid perovskite crystallites in 2016. On this basis, the CsPbBr3 crystallites with lower defect density were quickly synthesized by the solution method. The time-resolved luminescence spectra were studied. It was found that the fluorescence decay kinetics of single-photon excitation depended on the emission wavelength, and the fluorescence attenuation kinetics of two-photon excitation was independent of the emission wavelength. The analysis shows that there are rapid diffusion behaviors of carriers in the excited state of CsPbBr3 crystallites, and the carrier mobility exceeds 100cm2V-1S-1. High-efficiency charge collection can be achieved by constructing a CsPbBr3 micron photodetector with an ultra-high response (104A/W), which refreshes the highest reported value of all-inorganic perovskite photodetectors. Simultaneously achieve single-photon and dual-light response. In addition, the photodetector has a fast response time (1ms). This work provides new ideas for the preparation of high-performance photodetectors. The above work was funded by key projects of the National Natural Science Foundation of China.
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Dalian Institute of Materials Chemistry progresses in research on the dynamics of the whole inorganic perovskite photodetector