Perovskite layer manufacturing method, perovskite cell, cell assembly and photovoltaic system

The invention is suitable for the technical field of solar cells, and provides a manufacturing method of a perovskite layer, a perovskite cell, a cell module and a photovoltaic system. The manufacturing method of the perovskite layer comprises the following steps: providing a substrate of a to-be-manufactured perovskite layer; preparing a perovskite precursor wet film on a substrate by using the perovskite precursor solution; performing vacuum drying treatment on the perovskite precursor wet film to form a perovskite precursor dry film; and performing thermal solvent annealing on the perovskite precursor dry film to form a perovskite layer. Therefore, as the perovskite precursor wet film is subjected to vacuum drying treatment and thermal solvent annealing, the cross section of the crystal grains of the perovskite layer is approximately rectangular, only four surfaces of each crystal grain are in contact with other crystal grains, the number of crystal boundaries and crystal boundary defects in the perovskite