| 초록 |
We present a new electron-donating moiety, 2,2′-(2,5-dialkoxy-1,4-phenylene)dithieno[3,2-b]thiophene (TT-P-TT), composed of thieno[3,2-b]thiophene and 2,5-alkoxybenzene units. TT-P-TT has two intramolecular interactions between sulfur of thieno[3,2-b]thiophene and oxygen of 2,5-alkoxybenzene, resulting in high planarity which can maximize intermolecular interactions. We have synthesized a novel series of DPP based TT-P-TT polymers with various bulky side chains in the hydroxyl group of the TT-P-TT unit, that is, 2-ethylhexyl (P1), 2-butyloctyl (P2), and 2-octyldodecyl groups (P3), and systematically investigated the effects of intermolecular interactions by the control of side-chain bulkiness on charge transport. The thin-film microstructures were dramatically changed by tuning the side-chain bulkiness. The charge transport dynamics of DPP-based TT-PTT polymers was thoroughly investigated by structure−property relationship study. |
