Field induced diffusion of gold and related phase transformations in fullerenes C60 and C70 Original Research Article

The Au intercalation from the electrode into polycrystalline C60 and C70 thin films is studied by time dependent and space resolved studies of electrical resistivity measurements under oxygen free controlled atmosphere at different temperatures and applied voltages. The resistivity changes are interpreted on the basis of field induced metal diffusion with a subsequent formation of local phases MxC60, MxC70. A comparison of different features of C60 and C70 provides evidence that the process is sensitive to the electronic levels structure of the corresponding molecules.