2019 Volume 82 Issue 1 Pages 6-9
In semiconductor materials for printed electronics, not only high mobility but also solution processability are required. Liquid crystalline organic semiconductors have high solubility for organic solvent and controllability of molecular ori entation of films. In addition, it is easy to fabricate crystalline thin films with uniform and flat surface morphology by using uniform liquid crystalline films as their precursor. Furthermore, the liquid crystalline derivatives suitable for organic transistors are developed by molecular design for highly ordered liquid crystal phase such as smectic E (SmE) phase. In fact, Phenyl-Benzothienobenzothiophene derivative (Ph-BTBT-10) designed for the SmE phase has good thermal durability up to 200 °C, while keeping high solubility. In addition to this, Ph-BTBT-10 having monoalkyl chain can form the bilayer crystal structure, which cannot be achieved with dialkyl derivatives and often increase mobility. Therefore, liquid crystalline organic semiconductors are recognized as a potential candidate for semiconductor materials for printed electronics.
