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Long-term stability is an essential requirement for perovskite solar cells (PSCs) to be commercially viable.Heterojunctions built by low-dimensional and three-dimensional perovskites (1D/3D or 2D/3D) help to improve the stability of PSCs.However,the insulated organic cations of low-dimensional perovskite impede carriers transport,decreasing the power conversion efficiency (PCE) of PSCs.Herein,we introduce an in-situ cross-linking polymerizable propargyl ammonium (PA+) to the 3D perovskite film at surfaces and grain boundaries to form the 1D/3D stacking perovskite.This passivation strategy not only significantly improves the interracial carrier transport but also releases residual tensile strain in perovskite films.As a result,the corresponding devices achieve a champion PCE of 21.19%,while maintaining 93% of their initial efficiency after 3055 h of continuous illumination under maximum power point (MPP) operating conditions.