Perovskite solar cell and preparation method thereof

Abstract

The invention discloses a perovskite solar cell and a preparation method thereof. The method comprises the following steps: (a) selecting a substrate and preprocessing the substrate, the substrate being provided with a cathode electrode; (b) growing an electron transport layer on the substrate; (c) preparing a perovskite light absorption layer on the electron transport layer; (d) depositing a Basederivative organic hole transport material on the perovskite light absorption layer to form a hole transport layer; and (e) manufacturing an anode on the hole transport layer to complete the preparation of the perovskite solar cell. The solar cell disclosed by the invention is simple in process and relatively low in cost; meanwhile, the prepared solar cell has relatively high conversion rate andstability.

Description

technical field [0001] The invention belongs to the technical field of new energy, and in particular relates to a perovskite solar cell and a preparation method thereof. Background technique [0002] With the development of human society, its demand and consumption of energy are increasing day by day. Traditional energy sources such as coal, oil and natural gas not only cause serious environmental pollution, but also cause a great crisis in energy supply. In order to ensure the survival and development of human beings, it is imperative to seek green and sustainable energy sources. Directly converting solar energy into electricity or other forms of energy is becoming a very important way to gradually replace fossil fuels. In recent years, organic-inorganic perovskite solar cells have rapidly developed into the forefront of emerging photovoltaic technologies due to their high photoelectric conversion efficiency and large-area flexible preparation. Solar battery. At present, ...

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Problems solved by technology

However, due to the many synthesis steps, high cost, and low intrinsic conductivity and mobility of this type of material, when applied to battery devices, in order to obtain high photoelectric conversion efficiency, it is necessary to add materials such as bistrifluoromethylsulfonimide Lithium Li-TFSI, tert-butylpyridine tBP, FK209-Co(III)-TFSI cobalt salt and other P-type additives are used to oxidize spiro-OMeTAD to generate free carriers to improve its conductivity and mobility

[0004] However, such additives have strong hygroscopicity on the one hand, and are easy to absorb water molecules to corrode the perovskite layer and the hole transport layer; on the other hand, the oxidation reaction of lithium salts to spiro-OMeTAD mainly depends on light and oxygen in the environment. , which results in poor stability and reproducibility of the device; in addition, tert-butylpyridine is a Lewis base, which will interact with PbI 2 The reaction forms a complex and destroys the crystal structure of the perovskite

It can be seen that the use of p-type additives will not only affect the photoelectric conversion efficiency, life and stability of the battery, but also increase the cost of device preparation and the complexity of the process, which restricts the commercial development of perovskite batteries.

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