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").