Preparation method of quasi-two dimensional perovskite precursor solution

Abstract

The invention discloses a preparation method of a quasi-two dimensional perovskite precursor solution. The preparation method comprises the following steps: step one, dissolving lead bromide (PbBr2) and methylammonium bromide (NABr) or formamidine ammonium bromide (FABr) according to the molar ratio of 1:(0.5-1) into a polar solvent to prepare and obtain a three-dimensional perovskite precursor solution; step three, dissolving phenethyl ammonium bromide (PEABr) into the polar solvent to prepare and obtain a ligand precursor solution; and step three, mixing the three-dimensional perovskite precursor solution with the ligand precursor solution to prepare and obtain the quasi-two dimensional perovskite precursor solution. The preparation method has the advantages that the preparation method is simple and easy to operate, the preparation time is short, the using amount of precursor materials is small, other materials do not need to be introduced and the preparation cost is low; the quantity of single-layer and double-layer perovskite is obviously reduced in a perovskite film prepared based on the precursor solution provided by the invention, and the photoluminescence intensity is obviously promoted; and the performance of a perovskite light-emitting diode prepared based on the precursor solution provided by the invention is obviously promoted.

Description

technical field [0001] The invention relates to the field of preparation of photoelectric functional materials, in particular to a method for preparing a quasi-two-dimensional perovskite precursor solution for improving the light-emitting performance of a quasi-two-dimensional perovskite film. Background technique [0002] Quasi-two-dimensional perovskite materials have become a research hotspot due to their low price, good solution processing characteristics, and adjustable luminescence peak position. There are multiple layers of perovskite in the quasi-two-dimensional perovskite film. Different layers of perovskite correspond to different band gaps, forming an energy transfer path, which greatly improves the probability of carrier recombination and light emission. Therefore, Quasi-two-dimensional perovskite is an excellent candidate material for the preparation of perovskite light-emitting diodes. [0003] The literature ACS Appl. Mater. Interfaces 2017, 9, 29901-29906 re...

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Problems solved by technology

The literature Nature Communication2018, 9, 3892 reported that reducing the ligand content can enhance the charge transport performance of the quasi-two-dimensional perovskite film, but less ligand content has a greater impact on the quality of the film, so by reducing the ligand content to It is unrealistic to reduce the content of ultrathin perovskite in quasi-2D perovskite film

[0004] Document Adv.Funct.Mater.2018, 28, 1804187 reported that adding PEO to the precursor solution and cleaning with isopropanol reduced ultra-thin perovskites, but the device performance was sensitive to the content of PEO, and cleaning with isopropanol The process needs to be repeated many times, and the operation is more cumbersome

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