Photoelectrochemical behaviour of C60 films in various oxidation states

Abstract 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.