China has made new progress in the research of two-dimensional perovskite single crystal detectors

[ Instrument Network Instrument Development ] Recently, Liu Shengzhong, a researcher of the thin-film silicon solar cell research group of the Solar Research Department of the Dalian Institute of Chemical Physics, Chinese Academy of Sciences, and Shaanxi Normal University have made new progress in the research of two-dimensional perovskite single-crystal detectors. The results were published on the Cell sister magazine Matter.

Two-dimensional (2D) layered organic-inorganic hybrid perovskite has excellent stability and photoelectric properties, and has better application performance than three-dimensional (3D) perovskite, especially in the (001) plane. In the application of photodetectors, two-dimensional (2D) layered organic-inorganic hybrid perovskites have good photodetection properties. However, the excellent properties of a specific crystal face cannot be obtained not only from a randomly oriented microcrystalline film, but also from a microcrystalline film. Therefore, how to generate a large-sized high-quality two-dimensional perovskite single crystal having an orientation becomes a difficulty in deeply studying the anisotropic photodetection performance.

In order to solve the above problems, the research team skillfully utilized the surface tension of the solution to develop a new method for surface energy control crystallization. The large-size 2D (PEA) 2PbI4 perovskite single crystal was successfully grown. The side length of the single crystal can be Up to 36 mm. The resulting single crystal not only has excellent photodetection properties, but also has anisotropic photoelectric properties for each crystal face. Experiments show that the photodetector prepared on the (001) crystal plane has a response rate of 139.6A/W, an external quantum efficiency of 37719.6%, and a detection rate of 1.89×1015cmHz1/2/W. In addition, it has a faster Response speed (τrise = 21 μs, τdecay = 37 μs).

The research work was funded by the National Key Research and Development Program, the Central University Fundamental Research Fund, the National Natural Science Foundation Project, the 111 Project, and the Changjiang Scholar Innovation Team.

(Original title: Dalian Institute of Chemicals has made new progress in the research of two-dimensional perovskite single crystal detectors)

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