Universal Asymmetric Single-Halogenation of the Central Unit in Non-Fullerene Acceptors Enables High-Performance Organic Solar Cells with Efficiencies Approaching 20%

Halogenation of non-fullerene acceptors (NFAs) has been widely recognized as an effective strategy to enhance the power conversion efficiency (PCE) of organic solar cells (OSCs). Substantial-halogenation progress has been widely...