An ionic liquid additive 1‑propyl‑3‑methylimidazole chloride （MPICl） was introduced into the perovskite active layers and used to prepare highly efficient and stable inverted perovskite solar cells （PSCs）. The experimental results showed that the coordination bond formed by Pb²⁺ and lone pair electrons on N atom of MPICl imidazole ring could contribute to cooperative defect passivation and significantly inhibit non‑radioactive charge recombination. As a result， the power conversion efficiency （PCE） of the PSCs was increased from 16.69% to 18.18%， and the MPICl‑perovskite devices achieved significantly long‑term stability. This study provided an easy strategy of further reducing defects to obtain high‑performance devices.