| 초록 |
The recent development of non-fullerene small molecule acceptors (SMAs) has enabled a significant improvement of the power conversion efficiency (PCE) of organic solar cells (OSCs). Herein, a systematic investigation is conducted with the development of a series of SMAs, named as C6OB-H, C6OB-Me, and C6OB-F, which contain distinctive terminal substituents –H, –CH3, and –F, respectively. Interestingly, the PD/SMA pairs with similar terminal groups yield enhanced molecular compatibility 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. In particular, the OSC based on the PBDT-F:C6OB-F blend sharing the same fluorine terminal groups achieves the highest PCE of 15.2%, which outperforms those of PBDT-H:C6OB-F (10.1%) and PBDB-F:C6OB-H OSCs (11.2%). |
