Concurrent Nucleation of Mixed‐Halide Perovskite Phase via Balancing Solvent‐PbX 2 Interaction for Efficient Solar Cells in Air

Br cell is achieved, one cutting-edge value among congeneric devices, with excellent reproducibility by controlling the water dosage via a hydrophobic solvent encapsulation strategy. Together with the enhanced stability, this work provides a new path for engineering perovskite solution and promoting the scalable photovoltaics in air.