Perovskite solar cell and preparation method thereof

The invention belongs to the technical field of solar cell preparation, and particularly relates to a perovskite solar cell and a preparation method thereof. The preparation method comprises the following steps: coating a perovskite precursor solution and then carrying out first annealing, and coating a passivating agent and then carrying out second annealing to obtain a perovskite light absorption layer; and the passivating agent comprises P3HT. The perovskite light absorption layer prepared by the method has few defects, and the photoelectric conversion efficiency and stability of the perovskite solar cell can be improved. According to the invention, the passivator P3HT is coated between the two annealing processes for preparing the perovskite light absorption layer, so that the perovskite light absorption layer can be effectively passivated, the defects of the perovskite light absorption layer and non-radiative recombination at an interface are reduced, the incident light is fully utilized, and the photoel