Acridine‐substituted‐centronucleus nonfullerene acceptors enables organic solar cells with over 20% efficiency with low non‐radiative recombination loss

State‐of‐the‐art organic solar cells (OSCs) often suffer from low open‐circuit voltage due to high non‐radiative recombination losses (ΔEnr), which for OSCs with power conversion efficiencies (PCEs) over 18% typically exceed 0.200 eV, much higher than those of perovskite/silicon cells. This study introduces a novel approach by incorporating luminescent acridine units into quinoxaline‐based acceptor molecules (AQx‐o‐Ac and AQx‐m‐Ac) to enhance their photoluminescence quantum yields (PLQY). This modification improves electroluminescent quantum efficiency (EQEEL), reducing ΔEnr. Additionally, the acridine substitution promotes molecular aggregation and crystallization, reducing static disorder and improving charge transport. As a result, the PM6:AQx‐m‐Ac binary OSC achieves a PCE of 18.64% and a ΔEnr of 0.166 eV, the lowest reported for OSCs with PCEs over 18%. Further, incorporating AQx‐m‐Ac into a PM6:eC9 ternaryin reducing non‐radiative losses, paving the way for more efficient organic photovoltaics. blend results in a PCE of 20.28%. This work demonstrates the potential of luminescent units