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

摘要

Recently we have proposed a new OFET material exhibiting high mobility of over 10 cm2/Vs in polycrystalline thin films, i.e., Ph-BTBT-10.1 The most unique feature of this materials is that the polycrystalline thin films as-fabricated via a smectic liquid crystal phase 2 are mono-layered crystals and are transformed to bilayered crystals with accompanying significant increase of FET mobility by about one-order of magnitude when thermally annealed for a short time at 120°C.