High electron injection currents from a nanotube composite in an organic heterojunction

Organic bilayer heterojunctions have been fabricated from an organic polymer-nanotube composite and an insulating polymer. Using poly(m-phenlyenevinylene-co-2,5-dioctyloxy-p-phenylenevinylene) highly doped with multiwalled carbon nanotubes as an injection layer, extremely high electron injection currents through a poly-methylmethacrylate (PMMA) layer were observed. These currents are up to 10 6 times greater than those through PMMA alone. Examination of the AC and DC characteristics of these heterojunctions are presented in this paper. Also examined is the effect of an aluminium layer at the interface of the heterojunction on the electrical characteristics.