In Situ Direct-Current Conductance Investigation of Cu/ C₆₀ Nano-scale Granular Films

The in situ direct-current conductance behaviors of Cu/ C₆₀ nano-scale granular films have been investigated experimentally. The results show that the incorporation of Cu into C₆₀ greatly increases the conductance of the film. The orientational phase transition that exists in pure C₆₀ single crystals still retains in the Cu/C₆₀co-evaporated films, while the transition temperature range is significantly widened. The interactions between the nano-scale Cu clusters and C₆₀ grains are discussed.