Combining Energy Transfer and Optimized Morphology for Highly Efficient Ternary Polymer Solar Cells

摘要: Aimed at achieving ideal morphology, illuminating morphology–performance relationship, and further improving the power conversion efficiency (PCE) of ternary polymer solar cells (TSCs), a system is designed based on PTB7-Th:PffBT4T-2OD:PC71BM in this work. The PffBT4T-2OD owns large absorption cross section, proper energy levels, good crystallinity, which enhances exciton generation, charge dissociation transport suppresses recombination, thus remarkably increasing short-circuit current density (Jsc) fill factor (FF). Finally, notable PCE 10.72% obtained for TSCs with 15% weight ratio PffBT4T-2OD. As working mechanism, it confirmed transfer from to PTB7-Th, contributes improved generation. And morphology characterization indicates that devices possess both appropriate domain size (25 nm) enhanced purity. Under condition, affords numerous D/A interface bicontinuous nanostructure simultaneously. result, device exhibits possibility, elevated hole mobility inhibited leading Jsc (19.02 mA cm−2) FF (72.62%) This work optimization as well plays significant role TSC performance.