• • Champion PCE of 20.02% with a reduced non-radiative energy loss (KE3) of 0.216 eV, directly addressing the trade-off between efficiency and voltage loss in ternary OSCs.
• • T80 operational lifetime of 1065 h, demonstrating a 2.5-fold improvement over baseline binary devices, which is critical for commercial viability in outdoor photovoltaics.
• • Low Flory-Huggins interaction parameter ensures intimate mixing of C7-Cl guest acceptor with PM6:BTP-eC9 host, enabling optimized vertical phase separation and molecular packing without compromising charge transport.
• • High-sensitivity sEQE and EQEEL analyses provide quantitative evidence that guest acceptor doping suppresses non-radiative recombination pathways, a key bottleneck for exceeding 20% efficiency in organic photovoltaics.