Organic thin-film-transistor Au/poly(3-hexylthiophene)/ (bilayer dielectrics)/Si having carbon nanotubes chemically bonded to poly(3-hexylthiophene) in the active layer.

Using poly(3-hexylthiophene) (P3HT) covalently bonded with carbon nanotubes (CNT) as an active layer in a bottom-gate/top contact, Au/(P3HT)/(bilayer dielectric)/Si OTFT device has resulted in an enhanced charge transport. The CNTs were firstly functionalized via ligand exchange with ferrocene, next lithiated by sec-butyllithium (s-BuLi) and then linked anionically with P3HT which has been synthesized via the modified Grignard metathesis method. Compared to the pristine P3HT, the CNTs-containing P3HT composite material has a higher energy level of HOMO and a smaller electrochemical bandgap E(g)(chem).