Phenylalkylamine Passivation of Organolead Halide Perovskites Enabling High‐Efficiency and Air‐Stable Photovoltaic Cells

Benzylamine is introduced as a surface passivation molecule that improves the moisture-resistance of the perovskites while simultaneously enhancing their electronic properties. Solar cells based on benzylamine-modified formamidinium lead iodide perovskite films exhibit a champion efficiency of 19.2% and an open-circuit voltage of 1.12 V. The modified FAPbI₃ films exhibit no degradation after >2800 h air exposure.