Method for improving stability and efficiency of organic metal halide perovskite solar cell

The invention provides a method for improving stability and efficiency of an organic metal halide perovskite solar cell, and belongs to the field of solar cell. PbCl2 and PbI2 are sequentially deposited on a surface of FTO/TiO2 by a physical vapor phase deposition method, a lead halide is converted to a corresponding organic metal halide perovskite layer to obtain dual-layer perovskite, a Ch3NH3PbICl layer in a dual-layer perovskite structure has an effect of interface modification and passivation, the TiO2 and the perovskite can be more firm to combine, so that charges at a TiO2/perovskite interface are difficult to accumulate, the grain size of perovskite is increased, and the cell stability is improved; and moreover, the defect of the TiO2/perovskite interface also can be prevented by the Ch3NH3PbICl layer, the recombination of the interface can be reduced, and the cell efficiency is improved. 本发明提出了种提高有机金属卤化物钙钛矿太阳电池稳定性和效率的方法，属于太阳电池领域。本发明通过物理气相沉积法在FTO/TiO表面依次沉积PbCl和PbI，再将铅卤化物转变为对应的有机金属卤化物钙钛矿层，得到双