Highly Efficient and Mechanically Robust Organic Solar Cells Utilizing Hydrogen Bonding Functionalized Polymer Acceptor
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초록
내용
Organic solar cells (OSCs) with high power conversion efficiency (PCE) and stretchability are vital for wearable devices. To overcome mechanical robustness limitation in OSCs due to rigid polymer donors (PDs) and small-molecule acceptors (SMAs), a stretchable and conjugated polymer acceptor (PA, N2200-ThyDap) was synthesized, showing superior stretchability (crack onset strain (COS) = 34.1%) owing to hydrogen bonding compared to N2200 (COS = 2.2%). PM6:Y6-BO:N2200-ThyDap ternary system represents higher PCE (16.4%) than the binary (PM6:Y6-BO, PCE = 15.4%) and the N2200 based ternary system (PCE = 14.7%). The PM6:Y6-BO:N2200-ThyDap blend film exhibits greater stretchability (COS = 5.6%) than the PM6:Y6-BO binary (COS = 1.8%) and PM6:Y6-BO:N2200 ternary (COS = 3.4%) films, attributed to stronger intermolecular interaction by N2200-ThyDap. This study highlights the significance of designing conjugated polymer additive for high-performance and stretchable ternary OSCs.