Method for preparing perovskite nano-crystalline film by spraying

Abstract

The invention belongs to the field of a perovskite nano-crystalline film and discloses a method for preparing a perovskite nano-crystalline film by spraying. The method comprises the steps of: spraying precursor solution onto a substrate to form a a liquid film, wherein the precursor solution comprises a solvent and a perovskite material dissolved in the solvent; heating the substrate to enable the liquid film to form a half-dry film; spraying an antisolvent on the half-dry film to crystallize the half-dry film; and preparing the perovskite nano-crystalline film by adopting a spraying method,i.e., filling perovskite nano-crystalline dispersion into a spraying bottle, mounting the spraying bottle on a spraying gun, regulating a distance from the spraying gun to the substrate, a liquid output quantity of the spraying gun and an air pressure, then carrying out spraying after heating the substrate, and after annealing, obtaining the perovskite nano-crystalline film. The nano-crystalline film prepared by the method disclosed by the invention is uniform and compact, stable in substrate, good in photocatalytic performance, simple in structure, controllable in thickness and suitable for large-scale and industrial production.

Description

technical field [0001] The invention belongs to the field of perovskite nanocrystal films, in particular to a method for preparing perovskite nanocrystal films by spraying. Background technique [0002] In recent years, the solution-based controllable preparation of metal and semiconductor nanocrystalline materials has developed by leaps and bounds. A film preparation process to obtain dense and flat nanocrystalline films with adjustable thickness. A variety of preparation processes for solution-processable nanocrystalline films include spin-coating, pull-up, spray-coating, and solution self-assembly methods, but their applicable occasions are not the same. The spin coating method uses centrifugal force to shake off excess solvent and solute from the substrate, and can prepare nanocrystalline films with a thickness of tens to hundreds of nanometers. The disadvantage is that it is only suitable for the preparation of small-area films, and the material utilization rate is low...

AI Technical Summary

Problems solved by technology

[0012] The existing spraying method does not use substrate heating in the process of preparing nanocrystalline films, and the droplets formed by continuous spraying cannot evaporate quickly on the surface of the substrate, forming an uneven film

Various types of perovskite nanocrystals are synthesized by the solution method, but their solution stability is worse than that of traditional types of nanocrystals. There is no report on the preparation of perovskite nanocrystal films by spraying, so it is very necessary to optimize spraying process, so that uniform and dense perovskite nanocrystalline films with controllable thickness can be obtained

[0013] The traditional simulated annealing method is very sensitive to the parameters in the application of the FP spraying method to prepare the perovskite nanocrystalline film, and the problem that it cannot cross the energy barrier at the low temperature stage and hovers in the local optimal solution

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