A Biomimetic Hydrated Nanodomain Strategy for Perovskite Solar Cells

ABSTRACT The simultaneous pursuit of efficiency, stability, and environmental safety presents a critical bottleneck for perovskite solar cells (PSCs). Conventional hydrophobic passivation, though effective against moisture, often hinders charge transport and fails to contain lead. Inspired by biological cell membranes, this study introduces an “active hydration management” mechanism enabled by the in situ polymerization of zwitterionic 2‐methacryloyloxyethyl phosphorylcholine (MPC). The polymer network spontaneously reconfigures into a gradient structure with upward‐oriented hydrophilic side chains, sequestering atmospheric free water into stable hydrated nanodomains to form a robust barrier. Simultaneously, the large intrinsic dipole moment of MPC optimizes interfacial energy level alignment and suppresses explosive nucleation. These synergistic effects yield devices with a champion efficiency of 26.19% and superior stability under industrial “double 85” damp‐heat conditions, alongside significantly mitigated lead leakage. This biomimetic approach establishes a viable framework for resolving the efficiency‐stability‐toxicity trilemma in perovskite photovoltaics.