| Summary: | Compositional engineering adding organic and inorganic cations is considered one of the effective ways to improve the optoelectronic performance of PSCs. However, investigations of mixed-cations in PSCs are still a nascent area of research. In this study, an anti-solvent suitable for the preparation of mixed- cation perovskite was first adopted. We presented a simple surface engineering technique for manufacturing mixed-cation perovskite by injecting cations through the process of post-treatment of the adopted anti-solvent treated pure FAPbI<sub>3</sub> film with methylammonium iodide (MAI) solution. The prepared mixed-cation perovskite film showed uniform particle size, particle growth, and significantly improved short-circuit current, charge coefficient, device efficiency and device stability.
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