Hoyoul Kong, Y. Jung, N. Cho
May 14, 2009
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Influential Citations
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Journal
Chemistry of Materials
Abstract
A series of new organic semiconducting polymers containing the fused aromatic rings 3,6-dimethylthieno[3,2-b]thiophene or 3,6-dimethylselenopheno[3,2-b]selenophene as core units were successfully synthesized via oxidative coupling reactions. These core units have the adva3ntage of requiring one-step synthesis. Two polymers containing these core units, poly(2,5-bis(3-dodecylthiophen-2-yl)-3,6-dimethylthieno[3,2-b]thiophene) (PmT) and poly(2,2′-(3,6-dimethylselenopheno[3,2-b]selenophene-2,5-diyl)bis(3-dodecylthiophene)) (PmSe), exhibited very poor thin-film transistor (TFT) performances because of the distortion of the core units caused by inter- and intramolecular repulsion between long dodecyl side chains and methyl chains attached to the core units. In contrast, poly(2,5-bis(3′-dodecyl-2,2′-bithiophen-5-yl)-3,6-dimethylthieno[3,2-b]thiophene) (PTmT) and poly(5′,5′′-(3,6-dimethylselenopheno[3,2-b]selenophene-2,5-diyl)bis(3-dodecyl-2,2′-bithiophene)) (PTmSe) contain additional unsubstituted thiophene rings...