| 초록 |
The novel accepter unit, 4H-dithieno[3,2-c:2’,3’-e]azepine-4,6(5H)-dione, was approved and utilized for the synthesis of the conjugated copolymers containing electron donor–acceptor (D-A) pair for organic photovoltaic solar cells (OPVs). The dithienoazepinedione, bithiophene imide (BTI) group, is stylish electron deficient unit as it demonstrates strong electron-withdrawing disposition, good solubility and planar architecture. These copolymers exhibited excellent thermal stability and good solubility. The spectra of P1 and P2 solid films show absorption bands with maximum peaks at P1:395, 538 P2:380, 491 nm and the absorption onsets at 652 and 634 nm, similar to band gaps of 1.90 eV, 1.96 eV, correspondingly. The best device with P1: PC71BM in ODCB with 2% DIO showed a VOC of 0.97 V, a JSC of 3.06 mA/cm2, and a FF of 0.49, which yielded PCE of 1.49%. and the P2:PC71PM (1:2) showed a VOC of 0.84 V, a JSC of 2.48 mA/cm2, and a FF of 0.36, which yielded PCE of 0.76% |
