Improving the Stability and Efficiency of Perovskite Solar Cells by Controlling the Crystallization Active Layer with Binary Anti-solvent

In this study, a hybrid anti-solvent treatment was used to prepare high-quality MA_0.9FA_0.1PbI₃ perovskite film, and perovskite solar cells (PSCs) with carbon counter electrodes of high stability and high efficiency were fabricated. Different ratios of chlorobenzene (CB) and toluene (TL) were utilized as binary anti-solvent, and dropwise addition was initiated within spin-coating perovskite film. By optimizing the ratio of CB and TL, the formation process of perovskite film was effectively controlled and the crystallinity and coverage of the perovskite film were improved. The carbon electrode PSCs composed of MA_0.9FA_0.1PbI₃ film treated with anti-solvent exhibited a maximum power conversion efficiency (PCE) of 12.21% under air atmosphere conditions, which was higher than that of the PSCs of MA_0.9FA_0.1PbI₃ film without anti-solvent treatment. Finally, PSCs showed that the device still exhibits 90% of the initial efficiency after being stored in the air for 100 d, which shows excellent stability.