As part of our ongoing research program to produce a high-efficiency, low-cost, photovoltaic cell based on the fullerene C-60, we report here on our first attempts at the intercalative doping of C-60 thin films by the electrodiffusion of metals. Semiconductor behavior with decreased values of conductivity activation energy has been demonstrated for the doped samples. The results are explained by electrodiffusion of An from an electrode, dominated by grain boundary diffusion. (C) 2002 Published by Elsevier Science B.V.