Binary mixed solvent system and application of binary mixed solvent system to preparation of perovskite material

Abstract

The invention discloses a binary mixed solvent system and an application of the binary mixed solvent system to the preparation of a perovskite material. The binary mixed solvent system comprises an amine compound and ethanol. The invention further discloses a perovskite precursor solution, which comprises a perovskite precursor and a solvent, wherein the solvent includes the amine compound and theethanol. The invention further discloses a preparation method of a perovskite film. The preparation method comprises the steps of carrying out film forming treatment on the perovskite precursor solution at the room temperature to prepare the perovskite film. The amine compound-ethanol binary mixed solvent system is used for preparing a precursor solvent of the perovskite film by a one-step spin coating method, so that the preparation process of the precursor solution is simplified, the occurrence of uncontrollable factors is reduced, and the large-area high-quality perovskite film can be prepared conveniently and rapidly; and the obtained perovskite film does not need any annealing post-treatment process, so that the technological process is simplified.

Description

technical field [0001] The invention belongs to the field of perovskite precursor solution preparation and its manufacture, and in particular relates to a brand-new low-boiling point binary mixed solvent system and its method for rapidly preparing perovskite precursor solution, as well as the preparation of perovskite materials. use in . Background technique [0002] In recent years, with the rapid development of the field of third-generation thin-film solar cells, based on CH 3 NH 3 PB 3 This type of organic-inorganic hybrid perovskite material is a new star in the field of photovoltaics. Due to its low cost, solution processing, high light absorption performance, and excellent electronic properties, its photoelectric conversion The efficiency has increased dramatically from 3.8% in 2009 to 23.2% today, showing unprecedented advantages in the future green energy field. It is well known that the quality of the perovskite active layer directly restricts its battery perfor...

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Problems solved by technology

[0003] At present, the existing perovskite one-step spin coating method usually uses N,N-dimethylformamide (DMF), dimethyl sulfoxide (DMSO), and γ-butyrolactone (GBL) as solvent systems. High toxicity, high boiling point, and the solvent is not volatile

At the same time, the toxicity factor of solvent is also one of the limitations restricting the development of this kind of materials.

[0004] The limitation of the existing method of perovskite precursor solution mainly lies in that the method of preparing perovskite precursor solution by one-step spin coating only involves high boiling point solvents, which are highly toxic and have poor solubility, which always restricts high concentration The preparation of perovskite precursor solution, and the solution state is unstable, which limits the large-scale industrial production, and fails to enter the actual production practice from the laboratory

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