Influence of Tetraphenylbenzene on the OFET Behavior of Triarylamines

Abstract A series of new tetraphenylbenzene‐based triarylamines are successfully synthesized by employing the Diels–Alder cycloaddition reaction. The molecules exhibited good solubility in common organic solvents and thermal stability up to 500 °C. Molecular geometry and charge distribution of the molecules are envisioned by density functional theory. The high‐lying highest occupied molecular orbital (HOMO) level (‐5 eV) of compounds enables the p ‐channel conductivity. The influence of tetraphenylbenzene units on charge‐delocalization of HOMO, crystalline packing, and organic field‐effect transistor (OFET) characteristics is analyzed. OFETs are fabricated under ambient conditions by solution‐processable method, and the devices displayed promising performance with charge carrier mobility µ h up to 0.72 cm 2 V −1 s −1 , on/off ratio of 10 7 , and lowest V T of −2 V.