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a) J–V curves of perovskite solar cells made by two‐step process with different ratio of mixed dipping solvent. The devices were fabricated on a glass/ITO substrate. b) J–V curves of printed perovskite solar cells fabricated by two‐step process. c) SEM image of printed perovskite by two‐step process. (Inset) SEM image of gravure‐printed PbI2.
