| 초록 |
We synthesized a series of carbazole-based D-A copolymers to investigate the influences on intramolecular charge transfer (CT) complexation between the donor(D) and acceptor(A) components. There are two possible linkage sites at carbazole leading to significant differences in the thermal, photophysical and electrochemical properties of the copolymers, Poly[N-9′-hepta-decanyl-3,6-carbazole-alt-5,5-(4′,7′-di-2-thienyl-2′,1′,3′-benzothiadiazole)P(3,6C-DTBT), poly[N-9′-heptadecanyl-2,7-carbazole-alt-5,5-(4′,7′-di-2-thienyl-2′,1′,3′-benzothiadiazole) P(2,7C-DTBT). In order to introduce steric hindrance andbreak the coplanarity,we invited two additional hexyl substituents at the 4-position of the thiophene in the DTBT groups. Finally, the hole mobilities of the 3,6-carbazole-based copolymers measured in hole only devices were one order of magnitude higher than those of 2,7-carbazole-based copolymers. |
