Large-area flexible perovskite solar cell and printing preparation method

Abstract

The invention belongs to the technical field of solar cells and discloses a large-area flexible perovskite solar cell and a printing preparation method. The method comprises processing a flexible transparent electrode; preparing a hole transport layer; performing a solution from PEDOT:PSS and isopropyl alcohol in a volume ratio of 1:3; on the surface of a substrate, printing the PEDOT:PSS on the surface of the flexible transparent electrode by a slit printing method; performing heating and drying; then, preparing a perovskite layer, an electron transport layer, and a metal counter electrode. The invention develops a high-temperature hot air assisted method for preparing the perovskite film and related equipment, can achieve a relatively stable temperature in a local region of a coating head, and improves the stability and quality of the film forming. The invention develops a continuous drying method where air heating and infrared heating are combined and related equipment, improves theutilization of space, save the annealing time of the perovskite film, and improve the film forming quality.

Description

technical field [0001] The invention belongs to the technical field of solar cells, in particular to a large-area flexible perovskite solar cell and a printing preparation method. Background technique [0002] In recent years, perovskite solar cells have achieved rapid development, and their photoelectric conversion efficiency has exceeded 23%. Due to the high efficiency and low cost of perovskite solar cells, and the advantages that they can be prepared by solution method, perovskite solar cells have great potential for industrialization. [0003] At present, the existing technologies commonly used in the industry are as follows: [0004] Preparation of perovskite solar cells generally includes methods such as spin coating, doctor blade coating, printing (slit printing, screen printing), and vacuum evaporation. The performance of perovskite solar cells largely depends on the quality of perovskite thin films. Prepared by spin coating method, the perovskite film is uniform...

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Problems solved by technology

The existing large-area preparation technology, such as CN106953015A, utilizes the evaporation method to prepare large-area perovskite solar cells. Although the quality of the film formation is improved and the efficiency is improved, the vacuum atmosphere and heating required for evaporation increase the production cost. Not conducive to industrialization

Benjia Dou (Dou,Whitaker et al.2018) used the roll-to-roll technology to print and prepare the electron transport layer and the perovskite layer, but the subsequent hole transport layer was prepared by the spin coating method, and the electrode was prepared by the evaporation method, and The subsequent hole transport layer and electrodes are carried out on a small area. This method only prints and prepares part of the structure, and fails to achieve large-area full printing.

[0008] (3) The general roll-to-roll method prepares perovskite solar cells, the wettability of the substrate surface of the hole transport material is not good, and it is difficult to spread on the substrate surface, so that the formed hole transport layer is of poor quality; Since the perovskite needs to be annealed to achieve the purpose of evaporating the solvent and promoting the grain growth, when the perovskite layer is prepared by the roll-to-roll method, a long return time and a high annealing temperature are required, which makes the preparation process cumbersome. And the quality of the film is not stable

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