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Improved film surface is a prerequisite to achieve high photovoltaic performance of inorganic perovskite solar cells because defective (under‐coordinated) lead ions derived from imperfect lattice structure of the film surface or grain boundaries the principal nonradiative recombination centers in the inorganic perovskite absorber. In this study, we suggest poly[3‐(4‐carboxybutyl)thiophene‐2,5‐diyl]...