Effective doping by spin-coating and enhanced thermoelectric power factors in SWCNT/P3HT hybrid films

Abstract

This study investigates a coating method for doping a single-walled carbon nanotube (SWCNT)/poly(3-hexylthiophene) (P3HT) hybrid film. In the hybrid film, P3HT chains were very highly doped by simple spin-coating of a FeCl₃/nitromethane solution. Hybrid films doped by spin-coating exhibited power factors of 267 ± 38 µW m⁻¹ K⁻², which is an improvement over that of hybrid films doped by conventional immersion, 103 ± 24 µW m⁻¹ K⁻². The excellent thermoelectric performance is originated from the dramatically increased electrical conductivity by the sufficient doping of P3HT in the hybrid films.