Preparation method of quasi-two dimensional perovskite precursor solution
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A technology of precursor liquid and perovskite, which is applied in the field of preparation of photoelectric functional materials, can solve problems such as cumbersome operation, large influence, and sensitivity, and achieve the effects of low preparation cost, obvious brightness, and obvious photoluminescence intensity
Inactive Publication Date: 2019-07-19
NANJING UNIV OF POSTS & TELECOMM
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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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[0030] Such as figure 1 Shown, the preparation method of described a kind of quasi two-dimensional perovskite precursor liquid, comprises the following steps:
[0031] Step 1: lead bromide (PbBr 2 ) and methylammonium bromide (MABr) or formamidine ammonium bromide (FABr) are dissolved in a polar solvent according to a molar ratio of 1: (0.5~1), and a three-dimensional perovskite precursor is prepared, wherein the polar solvent One or more of N,N-dimethylamide (DMF) or dimethyl sulfoxide (DMSO);
[0032] Step 2: dissolving phenethylamine bromide (PEABr) in a polar solvent to prepare a ligand precursor; wherein the polar solvent is N,N-dimethylamide (DMF) or dimethyl sulfoxide ( DMSO) in one or more;
[0033] Step 3: Mix the three-dimensional perovskite precursor and the ligand precursor according to the PbBr 2 : Ligand precursor solution=1:(0.4~0.5) molar ratio is mixed, prepares quasi-two-dimensional perovskite precursor solution,
specific Embodiment 1
[0035] A preparation method of a quasi-two-dimensional perovskite precursor, comprising the following steps:
[0036] Step one: 0.2936g lead bromide (PbBr 2 ) and 0.0896g methylamine bromide (MABr) were dissolved in 1mL dimethyl sulfoxide (DMSO) to prepare a three-dimensional perovskite precursor;
[0037] Step 2: Dissolving 0.0808g of phenethylamine bromide (PEABr) in 1mL of dimethyl sulfoxide (DMSO) to prepare a ligand precursor;
[0038] Step 3: Mix the three-dimensional perovskite precursor and the ligand precursor according to the PbBr 2 : Ligand precursor solution=1:0.5 molar ratio is mixed, and the quasi-two-dimensional perovskite precursor solution is prepared.
[0039] In this example, the quasi-two-dimensional perovskite precursor solution prepared by the present invention is spin-coated on an ITO substrate covered with polyethylenedioxythiophene: polystyrenesulfonic acid (PEDOT:PSS) to form a perovskite film layer for subsequent photoluminescence, absorption, and...
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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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