Preparation of Highly Efficient and Stable CsPbBr3 Perovskite Solar Cells Based on an Anti-Solvent Rinsing Strategy

CsPbBr3 perovskite solar cell has become a hot research object due to its excellent stability. It has been proved that anti-solvent washing is a good way to improve the crystal quality of organic-inorganic hybrid perovskite materials using a one-step spin-coating method. However, it is rarely reported in the preparation of all-inorganic perovskite materials. Here, an anti-solvent rinsing strategy was introduced for the synthesis of CsPbBr3 films via the multi-step spin-coating process. We found that the addition of anti-solvent with high boiling points could significantly improve the surface morphology and crystal quality of CsPbBr3 films by optimizing the nucleation and crystallization of PbBr2 films. By virtue of the anti-solvent rinsing strategy, the highest efficiency of 9.6% and long-term stability over 800 h in ambient air without encapsulation were achieved. Our conclusions provide a certain reference value for the preparation of highly efficient and stable CsPbBr3 perovskite solar cells.