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.