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Among the three-dimensional (3D) organic-inorganic hybrid perovskites (OIHPs), mixed formamidinium and methylammonium cation lead iodide is one of the most promising for solar cell application. After optimizing the use of a methylammonium chloride (MACl) additive for the preparation of compact, high-quality, and large crystal grain layers made of a pure α-phase perovskite with the FA0.94MA0.06PbI3 composition, the treatment of the perovskite surface by a 2-phenylethylammonium iodide (PEAI) solution has been performed. This treatment, wi