Charge Transfer In The Fullerene C-60-Few Layer Graphene System And The Existence Of Negative Photoconductivity

The electrical conductance of few layer graphene during thermal evaporation of fullerene C-60 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-60 was thermally evaporated on these films. We found an increase in conductance of few layer graphene during the thermal evaporation of C-60 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. (C) 2014 AIP Publishing LLC.