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NiOx‐based inverted perovskite solar cells (PSCs) have attracted growing attention due to their low cost and large‐scale application potential. However, the efficiency and stability of inverted planar heterojunction PSCs is still unsatisfactory owing to insufficient charge‐extraction caused by undesirable interfacial contact between perovskite and NiOx hole transport layers (HTLs). Herein an interfacial...