An Epitaxial Growth Method for Large-area Metal Halide Perovskite Single Crystal Arrays for Nuclear Radiation Detection and Imaging

Abstract

The invention provides a method for epitaxial growth of a large-area metal halide perovskite single crystal array for nuclear radiation detection and imaging, comprising the following steps: placing a mask plate with a hollowed out array on pretreated CsPbBr 3 (CPB) substrate; then transfer the perovskite precursor solution to the mask to cover the entire surface of the mask, and control the relative humidity to 30%-50%. After the solvent evaporates, the mask and the substrate After separation, a single-crystal array with a mask is obtained, which is a large-area metal halide perovskite single-crystal array. The method of the present invention can grow large-area perovskite single crystal arrays with consistent crystallographic orientations, and obtain perovskite single crystal grains of different sizes by controlling the size of the hollowed-out array of mask plates.

Description

technical field [0001] The invention relates to an epitaxial growth method for a large-area metal halide perovskite single crystal array used for nuclear radiation detection imaging, and belongs to the technical field of perovskite array preparation. Background technique [0002] The nuclear radiation detection and imaging technology uses high-energy radioactive rays (such as X-rays) as the medium to obtain the structural or functional information of the detection object in the form of images, and provides various information for the corresponding industry to diagnose, detect and monitor the observed objects. The technical means are widely used in medical imaging, customs security inspection, industrial product quality monitoring, nuclear detection and other fields. Detectors are an important part of radiographic equipment. The detector needs to meet the following 6 requirements: (1) high sensitivity: clear image; (2) high resolution: strong resolving power; (3) low detecti...

AI Technical Summary

Problems solved by technology

The highest sensitivity holder of the X-ray detector is the quasi-single crystal CsPbBr obtained by Tang Jiang of Huazhong University of Science and Technology by hot pressing. 3 Film measured 55684 μC Gy -1 cm -2 , but the detectors it manufactures are single-pixel detectors, which need to be moved continuously to form images. The detection range is small and the function is single, which undoubtedly increases the complexity of the work (see: Pan W, Yang B, Niu G, et al .Hot-PressedCsPbBr 3 Quasi-Monocrystalline Film for Sensitive Direct X-ray Detection[J].Advanced Materials,2019,31(44):1904405.)

In 2017, South Korea's Samsung Group reported for the first time that a printable organometallic perovskite can achieve large-area, low-dose X-ray imaging. It has prepared a printable polycrystalline perovskite with large grain angles, and its morphology and optoelectronic properties Comparable to single crystal, but due to the connection between pixels, the crosstalk problem still needs to be solved (see: Kim Y C, Kim K H, Son D Y, et al. Printable organometallic perovskiteenables large-area, low-dose X-ray imaging[ J].Nature,2017,550(7674):87-91.)

The method used in the patent growth array needs to be combined with photolithography technology and spin coating technology, and the steps are relatively complicated

The obtained array is a polycrystalline thin film array, not a single crystal thin film, and has many defects, so the photoelectric conversion efficiency is low

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