The photoelectrochemical behaviour of C-60 films, deposited on gold and glassy carbon surfaces, was studied in various oxidation states, and with various compounds in the solution phase. It was established that neutral C-60 films behave as porous intrinsic semiconductors, and they can be converted to porous n-type semiconductors upon reduction in the presence of Li+, or Na+. If the reduction was carried out in K+-, Rb+-, or Cs+-containing solutions, the reduced films were pure conductors. Depending on the size of the electroactive species in the electrolyte, both photo-oxidation and photoreduction could be observed on the semiconducting reduced films, The spectral dependence of the photocurrents was also determined, and some basic parameters of the films were established.