POS4-0819
organic solar cells, polymer acceptors
Topic
S4. Colloids, Interfaces, and Molecular Assemblies for Functional Soft Materials
When and Where
Oct 1, 2026
08:30 - 09:30
Room 301 (Grand Ballroom)
Session Chairs
Jinkee HONG
Ki Su KIM
Presenter(s)
SONG XUYAO (Gyeongsang National University)
Co-Author(s)
Abstract
Organic solar cells (OSCs) deliver high efficiency but suffer from stability losses due to small molecule acceptor (SMA) aggregation, which hinders their commercial application. Incorporating polymer acceptors (PAs) into ternary blend systems has emerged as a promising strategy. By leveraging complementary advantages, ternary blend systems with a PA enable optimized energy level alignment, enhanced charge transport, and improved thermal and mechanical stability. In this work, we report BO-C20-BDTCl, a donor–acceptor copolymer engineered with structural units compatible with both PM6 and Y6 to create a well-controlled cascaded energy structure in PM6/Y6/PA ternary blend systems. This molecular design strategy enables the regulation of backbone regularity and side-chain structure, allowing the systematic optimization of energy alignment, charge transport, and morphological stability. At just 0.05 wt % addition, BO-C20-BDTCl promotes exciton dissociation and suppresses trap-assisted recombination, yielding a PCE of 17.9% under AM 1.5 G illumination (Voc = 0.876 V, Jsc = 26.7 mA cm–2, FF = 76.7%), 0.6% higher than PM6/Y6. Notably, devices exhibit enhanced stability, retaining 60% of the initial PCE after 500 h at 100 °C and 80% after 500 h under ambient conditions (25 °C, RH 20%). These results confirm that trace BO-C20-BDTCl substantially enhances both the efficiency and operational stability in ternary blend systems.
