Perovskite material-based solar cell and preparation method thereof

Abstract

The invention relates to a perovskite material-based solar cell and a preparation method thereof. The perovskite material-based solar cell sequentially comprises a transparent substrate, a transparent conductive electrode, a hole transport layer or an electron transport layer, a perovskite layer, the electron transport layer or the hole transport layer and a metal conductive layer from a surface layer to an inner layer, wherein the perovskite layer comprises a lead halide complex; and the lead halide complex is a precipitate which is obtained by the following steps: mixing anhydrous lead halide powder (the general chemical formula is PbX<2>, and X is any one of Cl, I, Br three elements) with a dimethyl sulfoxide solvent or an N,N-dimethylformamide solvent or a tetrahydrofuran solution of methylamine, and completely dissolving the PbX<2> powder into the dimethyl sulfoxide solvent or the N,N-dimethylformamide solvent or the tetrahydrofuran solution of methylamine; and adding a chlorobenzene solvent for stirring and mixing, and then standing and filtering the mixture. According to the perovskite material-based solar cell and the preparation method thereof, the CH<3>NH<3>PbX<3-n>Y<n> crystal conversion condition is reduced; the PbX<2> impurity residue is reduced; the flatness of a film is improved; the light energy absorption efficiency of the perovskite layer film is improved; and the efficiency and the stability of the solar cell are improved.

Description

technical field [0001] The invention belongs to the technical field of solar energy applications, and in particular relates to a solar cell based on a perovskite material and a preparation method thereof. Background technique [0002] Solar cells based on perovskite materials are a kind of use such as (CH 3 NH 3 wxya 3-n Y n ) Form compounds as light-absorbing materials for solar cells, where X, Y=Cl, Br, I, etc. The basic structure of the battery is as figure 1 As shown, from bottom to top, it is divided into transparent base layer, transparent conductive electrode, hole / electron transport layer, perovskite layer, electron / hole transport layer, and metal electrode. The R&D focus is on the perovskite layer. [0003] The existing main method of forming the perovskite layer starts with anhydrous lead iodide powder (PbI 2 ) is directly dissolved in N,N-dimethylformamide (DMF), the solution is heated, and then the dissolved solution is spin-coated on the surface of the ...

AI Technical Summary

Problems solved by technology

Due to PbI 2 The thickness is thicker (generally greater than 200 nanometers), it is not easy for MAI to react completely, and the reaction is incomplete, so when the (CH 3 NH 3 )PbI 3 After crystallization, there will still be a small amount of PbI 2 Impurities remain in the film, which affects the stability of the film and reduces the solar energy absorption efficiency

In addition, it also affects the flatness of the film, resulting in uneven thickness of the film and poor flatness.

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