Organic Field Effect Transistors Using Composites of Semiconductive Polymers and Single-Walled Carbon Nanotubes

We fabricated organic field effect transistors (FETs) using semiconductive polymers incorporating small amounts of single-walled carbon nanotubes (SCNTs) as an active layer. Poly(3-hexyl-thiophene) (P3HT) and poly(3,3''-dioctyl-terthiophene) (PDTT) were used as matrix semiconductive polymers. The mobility of the FETs was increased by more than two orders of magnitude maintaining high on–off ratios of over 10 5 by incorporation of SCNTs into the polymers. Uniform dispersion of SCNTs into the semi-conductive polymers was essential for this enhancement of FET mobility, which was attained by use of SCNTs wrapped with P3HT ("SCNT-complex").