Dual-site synergistic passivation for CsPbBr 3 perovskite solar cells with record 1.707 V V oc and 11.23% efficiency

Bidentate diphenylphosphine ligands passivate Pb 2+ defects via dual-site coordination, achieving CsPbBr 3 perovskite solar cells with record 11.23% PCE, 1.707 V V oc and >90% stability retention over 1800 h under 80 °C & 80% RH.