Dalian Institute of Chemical Technology and others made new progress in the research of two-dimensional perovskite single crystal detectors
Recently, Liu Shengzhong, a researcher of the thin-film silicon solar cell research group of the Solar Energy Research Department of the Dalian Institute of Chemical Physics, Chinese Academy of Sciences, has collaborated with Shaanxi Normal University to make new progress in the research of two-dimensional perovskite single crystal detectors. Related results were published in the sister issue of Cell, Matter.
Two-dimensional (2D) layered organic-inorganic hybrid perovskite has excellent stability and photoelectric properties. Compared with three-dimensional (3D) perovskite, it has better application performance, especially on the (001) plane In terms of applications for preparing photodetectors, two-dimensional (2D) layered organic-inorganic hybrid perovskites have good light detection performance. However, the excellent properties of specific crystal planes cannot be obtained not only from randomly oriented microcrystalline films, but even from microcrystalline films. Therefore, how to generate oriented large-size and high-quality two-dimensional perovskite single crystals becomes a difficult point to deeply study the anisotropic photoelectric detection performance.
In order to solve the above problems, the research team used the surface tension of the solution ingeniously to develop a new method of surface energy control crystallization, and successfully grown a large-size 2D (PEA) 2PbI4 perovskite single crystal, the side length of the single crystal can be Up to 36 mm. The obtained single crystal not only has excellent light detection performance, but also each crystal plane has anisotropic photoelectric performance. Experiments show that the response rate of the photodetector prepared on the (001) crystal plane is as high as 139.6A / W, the external quantum efficiency is 37719.6%, and the detection rate is 1.89 × 1015cmHz1 / 2 / W. In addition, it has a faster Response speed (τrise = 21μs, τdecay = 37μs).
The research work was supported by the National Key Research and Development Program, the Central University Fundamental Research Fund, the National Natural Science Foundation of China, the 111 Project, and the Yangtze River Scholars Innovation Team.
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