The Imaging Society of Japan

Monoalkylated liquid crystalline organic semiconductors, Ph-BTBT-10, not only provides us with crystalline thin films having uniform and flat surface morphology, thanks to the liquid crystallinity, but also causes the phase transition from monolayered crystals to bilayered crystals when thermally annealed for a short time. Significant improvement in mobility, which reaches almost one order of magnitude, takes place after the annealing when its crystalline thin films are used for an active layer for organic transistors. In the presentation, we will show its generality through observation of phase transition behaviors and evaluation of organic field effect transistors fabricated with a various type of the monoalkylated liquid crystals.