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A new method for preparing two-dimensional perovskite thin films

A technology of perovskite and perovskite precursor is applied in the field of preparation of new two-dimensional perovskite thin films, which can solve the problems of disordered distribution of each phase, and achieve easy operation, reduce defect concentration, and reduce low-n-value phase. effect

Active Publication Date: 2022-08-09
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the technical problems that there are a large number of n-value phases in the polycrystalline perovskite film prepared from the existing perovskite precursor solution, and the distribution of each phase is chaotic.

Method used

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  • A new method for preparing two-dimensional perovskite thin films
  • A new method for preparing two-dimensional perovskite thin films
  • A new method for preparing two-dimensional perovskite thin films

Examples

Experimental program
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Effect test

Embodiment 1

[0037] Preparation of two-dimensional perovskite PEA 2 MA 2 Pb 3 I 10 film:

[0038]1. Preparation of two-dimensional perovskite single crystal: First, 1.62 g of lead acetate (5 mmol) was weighed and transferred to a reaction flask, then 253.5 mg of methylamine hydrochloride (MAC1 3.75 mmol) was added, and 7 mL of hydroiodic acid (HI 57 %) and then transferred to an oil bath, heated to boiling and reacted for 5 min, the solution was bright yellow after 5 min. In another vial, add 113 mg of phenethylamine (PEA), and then add 0.85 mL of hypophosphorous acid, and keep stirring for later use. Add the mixed solution of phenethylamine and hypophosphorous acid dropwise to the boiling solution, react for 15 min, transfer to a hot stage at 110 °C, close the hot stage, cool to room temperature, filter out the crystals with vacuum suction, and vacuum dry at 45 °C overnight , collect the crystals in the glove box for use.

[0039] 2. Mix dimethylformamide and toluene in a volume rat...

Embodiment 2

[0044] The steps are as in Example 1, the prepared two-dimensional perovskite precursor solution is filtered and then stored at room temperature, and other conditions remain unchanged.

Embodiment 3

[0046] The steps are as in Example 1, except that dimethylformamide and toluene are changed to γ-butyrolactone and chlorobenzene, respectively, and other conditions remain unchanged.

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Abstract

The invention belongs to the technical field of perovskite materials, and in particular relates to a method for preparing a novel two-dimensional perovskite thin film. In a mixed solvent, a two-dimensional perovskite precursor solution is prepared; 2) a two-dimensional perovskite film is prepared by using the two-dimensional perovskite precursor solution; wherein, the polar solvent A is composed of dimethylformamide, Any one or more of dimethyl sulfoxide, N,N-dimethylacetamide, γ-butyrolactone, and N-methylpyrrolidone are mixed to form, and the non-polar solvent B is composed of toluene, chlorine One or more of benzene, ethyl acetate and anisole are mixed. The invention ensures the phase purity and distribution of the two-dimensional perovskite thin film, can effectively reduce the formation of low-layer phase, reduce the defect concentration, and obtain high-quality two-dimensional perovskite thin film, and the process is simple and easy to operate.

Description

technical field [0001] The invention belongs to the technical field of perovskite materials, and in particular relates to a preparation method of a novel two-dimensional perovskite thin film. Background technique [0002] Inorganic halide perovskites possess tunable band gaps, high absorption coefficients, long carrier lifetimes, and high stability, and are promising absorbers for next-generation solar cells. The power conversion efficiency (PCE) of perovskite solar cells has increased from 9.7% to 25.2% within a few years. High-performance perovskite solar cells are dominated by 3D perovskite, however, the irreversible decomposition due to the intrinsic instability of 3D perovskite has raised serious questions about the commercialization of 3D perovskite solar cells. To meet further commercialization requirements, 2D halide perovskites have attracted much attention due to their hydrophobic organic spacer layer with good moisture resistance. Two-dimensional perovskites usi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L51/46H01L51/42H01L51/48H01L51/50H01L51/54H01L51/56C07C209/00C07C211/04C07C211/27
CPCC07C209/00H10K71/12H10K85/30H10K30/10H10K50/11H10K71/00C07C211/04C07C211/27Y02E10/549
Inventor 姚凯秦媛钟鸿杰熊敏
Owner NANCHANG UNIV