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The synthesis and carrier-transport properties of oligothiophene liquid-crystalline semiconductors are reported. An asymmetrically substituted terthiophene and quaterthiophene give rise to a highly ordered smectic mesophase (see Figure) with an excellent carrier mobility of up to 0.1 cm2 V–1 s–1 over a wide mesophase temperature range, including ambient temperatures. This mobility is comparable to that of organic polycrystals.
Funahashi et al. (2005) studied this question.