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a) Schematic illustration of roll‐to‐roll process for perovskite solar cell. (Inset) Optical images of films wound on rolls. b) Image of PbI2 roll printed by roll‐to‐roll process. (Inset) Images of converting PbI2 to perovskite, and MAPbI3 roll. c) J–V curves of roll‐to‐roll printed solar cells with different HTLs.
