A bridge link strategy for buried surface with perovskite provides superior defect passivation and energy alignment by employing the rationally selected mediator of glycocyamine. The interface enables slower crystal growth with enlarged grain size and absence of pinholes. The modified planar perovskite solar cell exhibits a champion power conversion efficiency of 24.70 % with an open circuit voltage of 1.194 V and retains 89 % of its initial efficiency after heating at 85 °C for 800 h.