Method for improving perovskite performance by changing perovskite unit cell parameters

The invention discloses a method for improving perovskite performance by changing perovskite unit cell parameters. Ions, atoms or molecules are doped into a lattice structure of the perovskite material to change perovskite unit cell parameters, so that the energy band structure, the carrier mobility and the carrier lifetime of the perovskite material are improved, the luminescence characteristic,the microstructure morphology of the material, the stability of the material and the like are coordinated, and the performance of the perovskite material is further improved. The method comprises thefollowing steps: synthesizing a perovskite material with a chemical formula of ABX3, A2C1D1X6 or A2BxC1-xDX6 (0 < x < 1), and doping electrons, ions, atoms, molecules and the like into a perovskite structure to improve the performance and the stability of the perovskite structure. The method is low in cost and remarkable in effect, is suitable for preparing the high-quality and high-stability perovskite material and has in