Wide-band-gap perovskite solar cell and preparation and application thereof

Abstract

The invention relates to a wide-band-gap perovskite solar cell and a preparation method and application thereof, which belong to the field of photoelectric materials and devices. The preparation method comprises the following steps of dissolving lead iodide, lead bromide, methyl ammonium iodide and methyl ammonium bromide in an ionic liquid methylammonium acetate according to a molar ratio of 3: 1: 3: 1 to prepare a wide-band gap perovskite precursor solution, and spin-coating the precursor solution on ITO transparent conductive glass deposited with an electron transport material and an interface material in air by adopting a one-step heating spin-coating method, and after annealing treatment, forming the wide-band-gap perovskite thin film which is compact and smooth in surface, high in crystallinity, low in defect state density and good in crystal orientation. The prepared wide-band-gap perovskite solar cell has excellent photoelectric conversion efficiency and excellent device stability.

Description

technical field [0001] The invention relates to a preparation method and application of a wide bandgap perovskite solar cell, in particular to a wide bandgap perovskite thin film capable of preparing a dense and smooth surface, high crystallinity, low defect state density and good crystal orientation. The simple method of the perovskite solar cell device belongs to the technical field of photoelectric materials and devices. Background technique [0002] Energy has always been an important driving force for the development of human civilization. The use of fossil energy has accelerated the development of science and technology and improved social productivity. However, while the pace of social modernization is accelerating, the "energy crisis" and the environmental pollution problems caused by the combustion of fossil fuels are also emerging, which have attracted more and more attention. It is imperative to expand renewable and environmentally friendly new energy sources. A...

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Problems solved by technology

[0003] At present, the silicon-based solar cell technology that dominates the market is mature, and the photoelectric conversion efficiency is relatively high, but the production cost is high and the process is complicated.

The second-generation multi-component compound thin-film solar cells have high photoelectric conversion efficiency and stable device performance, but some elements of the materials used in this type of cells are toxic or have scarce reserves, which limits the promotion and use of large areas.

However, little is known about how the use of such ionic liquid solvents in wide bandgap perovskites translates to the overall quality of perovskite films and therefore device performance.

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