Twisted Nanoribbon‐Like Electron Acceptor With Suppressed Non‐Radiative Loss and Seed‐Assisted Crystallization for High‐Efficiency Organic Solar Cells

) of 0.146 eV, among the lowest values reported to date, thereby enabling higher open-circuit voltage. Despite its large size, the twisted geometry of PDIY leads to a unique "low crystallinity, strong aggregation" behavior. This allows PDIY to serve as a potent morphology-directing additive that acts in a manner consistent with heterogeneous nucleation, inducing the formation of robust, large-diameter fibrillar networks within bulk-heterojunction blends. Consequently, the integration of PDIY yields a simultaneous enhancement across all photovoltaic parameters, boosting power conversion efficiencies (PCEs) from 19.62% to 20.57%. This work establishes twisted nanoribbon-like acceptor as a versatile molecular platform for the dual regulation of excited-state dynamics and active-layer morphology in next-generation OSCs.