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Conformationally Twisted Semiconducting Polythiophene Derivatives with Alkylthiophene Side Chain: High Solubility and Air Stability

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posted on 09.03.2010, 00:00 by Jong Won Park, Dong Hoon Lee, Dae Sung Chung, Dong-Min Kang, Yun-Hi Kim, Chan Eon Park, Soon-Ki Kwon
We report the synthesis of polythiophene derivatives that contain decylthiophenyl side chains, using synthetic strategies that achieve high organic semiconductor field effect mobilities by enhancing the π-conjugation in the side-chain conjugated system. With increased charge densities, we obtained high field effect mobilities, up to 0.050 and 0.003 cm2/(V s) from poly(3,4′′′-di(decylthiophenyl) sexithiophene) (PDTST) and poly(3,4′′′-di(decylthiophenyl) quaterthiophene) (PDTQT), respectively. PDTQT and PDTST are characterized by UV−vis, DSC, AFM images, and GIXD patterns. Increased conformational rotation in the main backbone, caused by intramolecular repulsion between neighboring thiophene units, lowers the HOMO level and introduces remarkable chemical stability in the presence of air as well as increases processability due to high solubility. The high solubility and oxidative stability of PDTST and PDTQT indicate that these side-chain conjugation system strategies have the potential for improving other thiophene-based semiconducting polymers.

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