Synthesis and Characterization of End-extended Quinoidal Molecule for Organic Field-Effect Transistor

Abstract

Organic semiconductors have been extensively studied due to light weight and mechanical flexibility for organic electronics. Among these, quinoid molecules have attracted significant interest as an active layer of organic field-effect transistors (OFETs) owing to planarity induced by double bond linkage. Their planar structure promotes π-orbital overlap and efficient π-π stacking; therefore, quinoid molecules are expected to exhibit effective charge transport. Recently, we have reported isatin terminated quinoids with many advantages such as easy and facile synthesis and possibility of diverse modification. Here, end-extended quinoid molecule (BzTQuT) consisting of benzothiophene was designed and synthesized to extend π-electron conjugation and improve intermolecular interaction for better charge transport. Its material properties were analyzed by TGA, DSC, UV-Vis absorption and cyclic voltammetry. Finally, BzTQuT was employed to OFET and electrical properties were characterized.