Surface defect passivation is pivotal for improving the efficiency and stability of perovskite solar cells. However, its reproducibility and universal applicability have not been fully explored, which poses limitations for large-scale production. In response, Rui Wang and colleagues from Westlake University published a study in Nature Energy on June 9, 2025, introducing a passivation strategy based on fluorinated isopropanol.
This approach employs a thin layer of low-dimensional perovskite to fully passivate surface defects without interfering with charge transport. Fluorinated isopropanol reduces the reactivity between passivator molecules and the perovskite, enabling the use of high concentrations of passivators to ensure complete defect passivation. Subsequent rinsing with a mixed solvent of fluorinated isopropanol and isopropanol removes excess passivator molecules. This strategy features a broad process window, high tolerance to deviations in passivator concentration, and applicability across various device architectures, perovskite compositions, and device areas. The method achieves high power conversion efficiencies and holds potential for enhancing scalability and production yields in industrial manufacturing.
