Perovskite solar cell and preparation method thereof

The invention belongs to the technical field of photovoltaic materials and devices, and particularly relates to a perovskite solar cell and a preparation method thereof. The perovskite solar cell comprises a substrate, an anode layer, a hole transport layer, a halide ammonium salt layer, a perovskite light absorption layer, an electron transport layer and a cathode layer which are sequentially stacked from bottom to top, the perovskite light absorption layer comprises CsPbIxBr3-x, x is 1-3, the hole transport layer comprises a nickel oxide layer, and x is 1-3. The electron transport layer comprises a niobium pentoxide layer, a C60 layer and a BCP layer which are sequentially stacked from bottom to top. According to the invention, a high-quality perovskite polycrystalline film can be obtained, so that the energy levels of the hole transport layer and the electron transport layer are matched with the perovskite light absorption layer, and extraction and transport of photon-generated carriers are facilitated. 本发