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Organic–inorganic halide perovskite solar cells (PSCs) have been extensively studied due to their simple fabrication methods and obvious device efficiency advantages. In this work, the perovskite CsSn0.5Ge0.5I3 is used as the light absorption layer, which is doped with Ge2+ in CsSnI3 to improve its stability. The polymers of 3‐hexylthiophene (P3HT) with excellent optoelectronic properties and low...