Functional‐Group‐Induced Single Quantum Well Dion–Jacobson 2D Perovskite for Efficient and Stable Inverted Perovskite Solar Cells

) with negligible hysteresis. The devices maintain >96% and >89% of their initial efficiency after continuous maximum power point tracking under simulated AM1.5 illumination for 1300 h and under damp-heat conditions (85 °C and 85% RH) for 1010 h, respectively.