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

摘要

The electrical conductance of few layer graphene during thermal evaporation of fullerene C 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 C was thermally evaporated on these films. We found an increase in conductance of few layer graphene during the thermal evaporation of C 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.