Large-area three-dimensional-two-dimensional perovskite heterojunction in-situ preparation method

Abstract

A large-area three-dimensional-two-dimensional perovskite heterojunction in-situ preparation system comprises a reaction cavity, and is characterized in that a bracket assembly is arranged in the reaction cavity, a solvent circulation assembly is arranged outside the reaction cavity, and a gas circulation pipeline is arranged at the top of the reaction cavity. According to the invention, the large-area high-quality 2D perovskite thin film is grown on the 3D quasi-monocrystalline perovskite layer in situ to form the 3D-2D perovskite heterojunction, so that the photovoltaic performance and the long-term stability of the perovskite solar cell are improved. The perovskite precursor solution and the anti-solvent solution are recycled in a closed mode, environmental pollution is reduced, and meanwhile the resource utilization rate is increased.

Description

technical field [0001] The invention belongs to the technical field of perovskite materials, and in particular relates to an in-situ preparation method of a large-area three-dimensional-two-dimensional perovskite heterojunction. Background technique [0002] In recent years, the photoelectric conversion efficiency of the perovskite solar cell (PSC) laboratory has been refreshed from 3.8% in 2009 to 25.2% in 2019, which has industrial value. However, most of these certified or reported high-efficiency PSCs are based on relatively small areas (generally 0.1cm 2 , some as small as 0.03cm 2 ) of three-dimensional (3D) polycrystalline perovskite materials. 3D polycrystalline perovskite materials are sensitive to humidity and temperature, and their lack of long-term stability seriously restricts the industrial application of PSCs. In order to improve the long-term stability of 3D perovskite materials, one of the effective solutions is to prepare a two-dimensional (2D) perovskit...

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Problems solved by technology

3D polycrystalline perovskite materials are sensitive to humidity and temperature, and their long-term stability seriously restricts the industrial application of PSCs

3D perovskite is a polycrystalline structure with a large number of grain boundaries and defects, which is not conducive to obtaining efficient and stable PSC devices, and the area is small; 2D perovskite layer area is small, and the organic polar solvent contained in the spin coating solution will There are many uncertain effects on the film-forming quality of the 3D perovskite layer, and what is even more unfavorable is that these solvents have a certain degree of toxicity. If the follow-up treatment is not proper, large-scale application will inevitably lead to serious environmental problems.

3D perovskite is a polycrystalline structure with a large number of grain boundaries and defects, which is not conducive to obtaining efficient and stable PSC devices, and the area is small; 2D perovskite layer area is small, and the organic polar solvent contained in the spin coating solution will There are many uncertain effects on the film-forming quality of the 3D perovskite layer, and what is even more unfavorable is that these solvents have a certain degree of toxicity. If the follow-up treatment is not proper, large-scale application will inevitably lead to serious environmental problems.

Both the 3D perovskite material and the 2D perovskite material are dissolved in polar organic solvents. When the 2D perovskite material is coated on the surface of the 3D perovskite layer, the organic polar solvent contained in the coating solution will The film quality of the 3D perovskite layer has many adverse effects, and the toxicity of these solvents can also cause serious environmental problems

The saturated vapor of butylamine is easy to leak, causing serious environmental pollution; and the amount of organic amine is large, and the utilization rate of resources is not high

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