Preparation method of copper-based perovskite nanocrystalline film

Abstract

The invention discloses a preparation method of a copper-based perovskite nanocrystalline thin film, which comprises the following steps of: in the process of sintering perovskite nanocrystalline powder into a perovskite thin film, firstly, putting the dried perovskite nanocrystalline powder into a mold cavity, and pressing the dried perovskite nanocrystalline powder into a cylindrical biscuit with the diameter of phi 20mm*10mm by using a cold pressing method in a nitrogen atmosphere; inserting the pressed cylindrical blank into a Mo crucible; and then installing a multi-anvil device, and performing six-axis extrusion in the axial direction of the six tungsten carbide anvils. The ultra-high pressure can greatly reduce the sintering temperature, so that the copper-based perovskite nanocrystalline powder can form a molten state below a thermal cracking temperature point, and meanwhile, the ultra-high pressure can promote rearrangement of copper-based perovskite nanocrystals, and preferred orientation enables system free energy to move towards a lower direction, so that the copper-based perovskite thin film with the millimeter-level thickness is finally obtained.

Description

technical field [0001] The patent of the present invention relates to the technical field of perovskite film preparation, in particular to a method for preparing a copper-based perovskite nanocrystalline film. Background technique [0002] X-ray detection materials are of great significance in customs security inspection, nuclear reaction monitoring, medical imaging, etc. because of their ability to convert X-rays into electronic or optical signals. Therefore, it is particularly important to obtain X-ray detection materials with high sensitivity and high detection efficiency. In recent years, all-inorganic cesium lead halide perovskites (Cs 3 Cu 2 x 5 , X = Cl, Br, I) Quantum dots (QDs) have been widely studied due to their high luminous efficiency, simple tunable photoluminescence in the visible range, and sensitivity to X-rays. For example, in X-ray radiation detection and medical imaging, due to its excellent radioluminescent properties, it is considered to be the most...

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Problems solved by technology

Conventionally, the solution method is used to form the film, and the solvent will volatilize during the preparation process, which is easy to form voids and the quality of the film is ordinary; another method is the vacuum method, which is mostly concentrated in the preparation of the film. In the preparation of calcium titanium Mineral thin films often have serious component segregation problems, resulting in impure perovskite thin films. In addition, crystals cannot grow in large areas. Therefore, the vacuum method is not the preferred method for preparing perovskite thin films.