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Preparation method of novel two-dimensional perovskite thin film

A technology of perovskite and perovskite precursors, which is applied in the field of preparation of new two-dimensional perovskite thin films, can solve the problems of disordered distribution of various phases, achieve easy operation, simple process flow, and ensure phase purity and distribution Effect

Active Publication Date: 2020-06-05
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Preparation method of novel two-dimensional perovskite thin film
  • Preparation method of novel two-dimensional perovskite thin film
  • Preparation method of novel two-dimensional perovskite thin film

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 weigh 1.62g of lead acetate (5mmol) and transfer it to the reaction flask, then add 253.5mg of methylamine hydrochloride (MACl 3.75mmol), add 7mL of hydroiodic acid (HI 57 %), then transferred to an oil bath and heated to boiling for 5 minutes, and the solution was bright yellow after 5 minutes. Add 113mg phenylethylamine (PEA) to another small bottle, then add 0.85mL 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 minutes, transfer to a hot stage at 110°C, turn off the hot stage, cool to room temperature, vacuum filter out the crystals, and vacuum dry at 45°C overnight , collect the crystals in the glove box for later use.

[0039] 2. Mix dimethylformamide and toluene according to the volume ratio of 4:1...

Embodiment 2

[0044] The steps are as in Example 1, the prepared two-dimensional perovskite precursor solution is filtered and 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 particularly relates to a preparation method of a novel two-dimensional perovskite thin film, which comprises: 1) dissolving atwo-dimensional perovskite single crystal in a mixed solvent composed of a polar solvent A and a non-polar solvent B to prepare a two-dimensional perovskite precursor solution; and 2) preparing a two-dimensional perovskite thin film by adopting the two-dimensional perovskite precursor solution, wherein the polar solvent A is formed by mixing any one or more of dimethylformamide, dimethyl sulfoxide, N, N-dimethylacetamide, gamma-butyrolactone and N-methyl pyrrolidone, and the non-polar solvent B is formed by mixing one or more of methylbenzene, chlorobenzene, ethyl acetate and anisole. According to the method, the phase purity and distribution of the two-dimensional perovskite thin film are ensured, the formation of low-layer number phases can be effectively reduced, the defect concentration is reduced, the high-quality two-dimensional perovskite thin film is obtained, and the method is simple in technological process 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 bandgap, high absorption coefficient, long carrier lifetime, and high stability, and are expected to be absorber materials 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 inherent instability of 3D perovskite has raised serious doubts about the commercialization of 3D perovskite solar cells. In order to meet further commercialization requirements, 2D halide perovskites have attracted attention due to their good moisture-proof properties due to their hydrophobic organic spacer layers. Two-di...

Claims

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Application Information

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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
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