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 105 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").