Bilayered crystalline organic semiconductors for solution-processed OFETs:asymmetrically-substituted smectic liquid crystal of benzo1,2-b:4,5-b’dithiophenederivatives

摘要

Recently we have proposed a new OFETmaterial exhibiting high mobility of over 10cm2/Vs in polycrystalline thin films, i.e.,Ph-BTBT-10.1 The most unique feature of thismaterials is that the polycrystalline thin filmsas-fabricated via a smectic liquid crystal phase 2are mono-layered crystals and are transformed tobilayered crystals with accompanying significantincrease of FET mobility by about one-order ofmagnitude when thermally annealed for a shorttime at 120°C.