Importance of Functional Group Design for Best Pairing of Polymer Donor and Small-Molecule Acceptor in High-Performance Photovoltaics
발표자
()
초록
내용
A systematic investigation is conducted with the development of a series of acceptor–donor–acceptor–donor–acceptor fused-type SMAs, named as C6OB-H, C6OB-Me, and C6OB-F, which contain distinctive terminal substituents –H, –CH3, and –F, respectively. These SMAs are paired with two PDs, PBDT-H and PBDT-F, to study the effect of each PD/SMA pair on device performance. Interestingly, the PD/SMA pairs with similar terminal groups yield enhanced molecular and energetic interactions at the interfaces, which suppress voltage loss while improving blend morphology to simultaneously enhance the open–circuit voltage, short–circuit current, and fill factor of the OSCs. This study establishes an important PD/SMA pairing rule in terms of terminal functional groups for achieving high-performance OSC with optimal blend morphology, effective charge generation, and minimal voltage loss.