| 초록 |
The new random copolymers and alternating copolymers using difluoro-quinoxaline and fluorene were synthesized by Stille and Suzuki coupling reactions, changing the ratio of electron-rich unit and electron-deficient unit. The polymers showed good solubility in organic solvents such as chloroform, toluene, chlorobenzene and o-dichlorobenzene (ODCB). These polymers showed an optical bandgap of 1.98 to 2.16 eV. The decomposition temperatures (Td) at 5% of the polymers were observed at approximately 415℃. The UV-vis absorption spectra of all polymers indicated in the range of 400 to 580 nm in chloroform solution and 400 to 650 nm in film state. Under optimized conditions, the best efficiency among the polymers was achieved in random copolymer (ratio of 3:2) with 3.55% of maximum power conversion efficiencies (PCE), Voc of 0.91 V, Jsc of 6.05 mA/cm2, FF of 0.64%. |
