Attaining a balanced charge carrier generation is a significant challenge in organic photovoltaics (OPVs). To enhance device performance, the ternary strategy has emerged as an effective approach. In this study, two Y6 derivatives, QIP-4F and QIP-4Cl, containing quinoxalineimide (QI) building blocks fused with thienylthiophene as the central unit were incorporated into the PM6:L8-BO system. The QI units reduce the energy losses in charge carrier extraction and non-radiative charge recombination. Furthermore, the increasing steric hindrance in the central block impacts the phase separation and ordered intermolecular packing, which enhancing the charge transport and minimizing the charge recombination. Ultimately, the PM6:L8-BO:QIP-4Cl device achieved a champion efficiency of 19.05%, offering a promising direction for enhancing the photovoltaic performance of OPVs.