Lead-tin hybrid perovskite thin film, and preparation method and application therefor

Abstract

The invention provides a lead-tin hybrid perovskite thin film, and a preparation method and an application therefor. The preparation method for the lead-tin hybrid perovskite thin film comprises the specific steps of dissolving PbRE<2> and SnRE<2> into DMF and DMSO mixed solvent to form a PbRE<2> solution and an SnRE<2> solution respectively, wherein RE is CL, Br or I; measuring the PbRE<2> solution and the SnRE<2> solution, and enabling the two kinds of solutions to be mixed to form a precursor liquid; coating a substrate with the precursor liquid in a spin-coating manner; then coating the substrate with a CH<3>NH<3>RE isopropanol solution in a spin-coating manner; and carrying out annealing on the substrate to obtain the hybrid perovskite thin film. According to the lead-tin hybrid perovskite thin film, the lead-tin hybrid perovskite thin film is prepared by a liquid phase two-step method, so that the content of heavy metal-lead in the thin film can be effectively reduced; and in addition, the coverage degree and the mass of the thin film can be improved, the pin holes of the thin film can be reduced, the electric leakage path can be reduced, and the photoelectric conversion efficiency of the prepared lead-tin hybrid perovskite solar cell can be improved.

Description

technical field [0001] The invention relates to the technical field of solar cells, in particular to a lead-tin mixed perovskite film, its preparation method and application. Background technique [0002] Solar cells can directly convert solar energy into electrical energy. Since solar energy is an inexhaustible clean energy source, solar cells are an important countermeasure for human beings to cope with the energy crisis and seek sustainable development. Currently, crystalline silicon solar cells account for 89% of the photovoltaic market share. However, expensive raw materials and cumbersome cell processes limit the long-term development of crystalline silicon solar cells. In the past decade, thin-film solar cells include silicon-based thin-film, Cu(In,Ga)Se 2-x S x And CdTe batteries have also begun to achieve large-scale industrialization. As an outstanding representative of the third generation of solar cells, perovskite solar cells are a new type of all-solid-stat...

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Problems solved by technology

However, a large number of experimental results have proved that the perovskite film prepared by the liquid phase one-step method is difficult to achieve a high coverage, and the surface of the film has a high roughness, which leads to an increase in leakage and recombination, thereby affecting the photovoltaic performance. adversely affect

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