Method for preparing perovskite solar cell by using BCP chlorobenzene anti-solvent

The invention relates to the field of perovskite solar cells. The invention discloses a method for preparing a perovskite solar cell with a perovskite absorption layer by taking a chlorobenzene (CB) solution in which BCP (Bromocresol Purple) is dissolved as an anti-solvent. The structure comprises transparent conductive glass (FTO or ITO), a hole transport layer (HTL), a perovskite active layer (PVSK), an electron transport layer (ETL) and a metal electrode, wherein the perovskite active layer is located between the ETL and the HTL. The anti-solvent method is a common method for producing the perovskite absorption layer, and BCP is introduced into the anti-solvent CB, so that the perovskite film-forming characteristic is improved, and the interface contact is optimized. In addition, N atoms with lone pair electrons in BCP molecules can effectively passivate halogen vacancy defects of the perovskite thin film, the recombination probability of carriers on an interface is reduced, and separation and transmission