The interface modification of MAPbI3 films by dodecyltrimethylammonium chloride achieves passivation of both the film surface and grain boundaries. Ultimately, the power conversion efficiency and stability (thermal, optical, humidity, and antioxidant) of unencapsulated hole‐free carbon‐based perovskite solar cells are significantly enhanced. Currently, achieving both high efficiency and long‐term stability is crucial for the successful application of perovskite solar cells (PSCs). Grain boundary (GB) defects significantly impact the stabilit...
