Charge transfer in the fullerene C60-few layer graphene system and the existence of negative photoconductivity

Abstract

The electrical conductance of few layer graphene during thermal evaporation of fullerene C60 as well as the conductance under illumination of this bilayer junction is reported. We obtained few layer graphene films by chemical vapor deposition technique, and then C60 was thermally evaporated on these films. We found an increase in conductance of few layer graphene during the thermal evaporation of C60 and a kind of negative photoconductivity when the bilayer junction was under illumination. We observed that at low light intensities few layer graphene is p-type doped, and we propose that its behavior changes to n-type for high light intensities.