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Low-cost fabrication of perovskite solar cells while fusing large-area deposition potential along with high power conversion efficiency and durability paves the way for scaling up the perovskite solar cells. In this work, a novel approach in the simultaneous deposition of hole-transporting and contact layers is introduced. The interface engineering is conducted in order to grow CuI as a hole-transporting material at the interface of Cu contact and perovskite layer through which great reproducibility and durability are achieved. The prepared devices show 9.24% and 8.3% power conversion efficiencies for 0.1 and 1 cm² active areas, respectively.