Research progress on high-performance two-dimensional perovskite single crystal nanowire array photodetectors


Two-dimensional perovskite single crystal nanowire array edge state photoconductive mechanism

Organic-inorganic perovskite materials have excellent photoelectric properties and are used to prepare high-efficiency solar cells and light-emitting diodes. Perovskite has high carrier mobility, long life and diffusion distance, and is also a kind of ideal photodetector material. However, the three-dimensional perovskite dark current has a greater impact on the signal-to-noise ratio of the photodetector, and its development is limited. The photodiode detector based on polycrystalline thin film can suppress the dark current, but it cannot achieve a large photoconductive gain, and the device sensitivity is not ideal.

Recently, Wu Yuchen, Ph.D. of the Institute of Physics and Chemistry Technology, Chinese Academy of Sciences, Jiang Lei, a member of the Chinese Academy of Sciences, and Fu Hongbing, a professor at the Tianjin University, and Zhang Xiang, a foreign academician of the Chinese Academy of Sciences and a professor at the University of California, Berkeley, prepared a high-quality two-dimensional perovskite The single crystal nanowire array discovered the edge-state photoconductive effect of two-dimensional perovskite nanowires for the first time, and realized the highest sensitivity perovskite photodetector in the world.

The researchers controlled the crystal growth of the two-dimensional perovskite by asymmetrically infiltrating the interface. Through electron diffraction and synchrotron radiation grazing incidence X-ray scattering, it was found that the prepared nanowires had a single orientation, and a few conductive layers of perovskite and butylamine-based ion layers were assembled to form a superlattice structure. By measuring the fluorescence and photoconductivity of nanowires of different heights, it was found that the edge of the perovskite layer can effectively split excitons, generate and conduct free carriers, and thus achieve excellent photoconductivity. The photodetector prepared based on this nanowire achieves a response of more than 104A / W and a detection of more than 7 × 1015 Jones. It is the most sensitive perovskite photodetector in the world and has higher performance than traditional silicon photodiodes. 2-3 orders of magnitude.

Related research results were published in Nature-Electronics and reported as highlight. Related research has been supported by key special projects of the Ministry of Science and Technology, key projects of the National Natural Science Foundation of China and general projects of the Beijing Natural Science Foundation.

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