Selective Coordination‐Driven Kinetic Synchronization of Two‐Step Tin‐Lead Perovskites for High‐Performance All‐Perovskite Tandem Solar Cells
All‐perovskite tandem solar cells hold great promise for high power conversion efficiencies. However, their narrow‐bandgap tin‐lead (Sn‐Pb) mixed perovskite subcells often suffer from severe crystallization imbalance under conventional one‐step solution processing, due to the intrinsically different behaviors of Sn...