Method for preparing FAPbI3 perovskite thin film and efficient perovskite solar cell by using FAPbI3 perovskite thin film

The invention relates to a method for preparing an FAPbI3 perovskite thin film and an efficient perovskite solar cell thereof, and belongs to the field of optoelectronic materials and devices. According to preparation of the pure-phase FAPbI3 thin film, ammonium acetate serving as an additive and a perovskite component are dissolved in N, N-dimethylformamide serving as a precursor solution through a one-step method, the solution is spin-coated on an FTO conductive substrate with an electron transport layer, the uniform and compact perovskite thin film is prepared through annealing, and the whole process is carried out in a water-free and oxygen-free glove box. Subsequent treatment is carried out on the thin film, Spiro-OMeTAD is used as a hole transport layer, and a MoO3 modification layer and a metal electrode are evaporated by using a vacuum evaporation technology so as to complete preparation of the device. The pure-phase FAPbI3 perovskite solar cell prepared by the method has excellent photoelectric conve