Perovskite thin film, preparation method and application

Abstract

The invention discloses a perovskite thin film, a preparation method and application, and the method comprises the following steps: respectively putting M powder and lead iodide powder into a heating boat, putting a substrate and the heating boat into a vacuum coating machine, vacuumizing, putting the heating boat below the substrate, and electrically heating the heating boat to volatilize the M powder and the lead iodide powder to obtain a lead source thin film; transferring the substrate to another cavity, and depositing a layer of amine salt on the lead source film; and annealing to obtain the perovskite thin film. According to the invention, different lead sources are evaporated in vacuum to obtain the lead source film with high flatness and high uniformity; the perovskite thin film is prepared by adopting a two-step method, the problem that a large-area perovskite thin film is difficult to prepare by adopting a traditional two-step solution spin-coating method is effectively solved, an organic solvent is not used in the preparation process, and the damage effect of the organic solvent on a functional layer below the perovskite thin film and the adverse effect on the environment are avoided; the obtained perovskite thin film can be applied to preparation of photoelectric devices.

Description

technical field [0001] The invention belongs to the technical field of photoelectric functional materials, and in particular relates to a perovskite thin film, a preparation method and an application. Background technique [0002] Metal halide organic-inorganic hybrid perovskite solar cells, as a new generation of photovoltaic power generation technology, have the advantages of low cost and simple preparation, and have attracted extensive attention from academia and industry. Break the traditional silicon battery market. Compared with traditional silicon cells, perovskite cells have the advantages of long carrier lifetime, long diffusion distance, direct bandgap and adjustable bandgap. Its basic structure includes a conductive metal oxide substrate, an electron transport layer, a perovskite light-absorbing layer, a hole transport layer, and a metal back electrode. The preparation method of perovskite thin films is crucial in the preparation of perovskite cells and other op...

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Problems solved by technology

[0004] Aiming at the technical problem that the quality of the perovskite film prepared by the two-step evaporation method directly using lead iodide as the lead source is relatively low in the above-mentioned prior art, the present invention provides a perovskite film, preparation method and application , the present invention uses co-evaporated lead iodide, lead chloride and / or lead bromide as the lead source for the preparation of perovskite films in a two-step method, which effectively solves the difficulty in preparing large-area perovskite by the traditional two-step solution spin coating method The difficult problem of ore, do not use organic solvent in the preparation process, have avoided organic solvent to produce the damage effect to the functional layer below the perovskite thin film and have adverse impact on the environment, provide the basis for the industrial production of perovskite battery; Based on the present invention, obtain The perovskite thin film can be applied in the field of photovoltaic devices such as solar cells

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