Enhanced field emission current from diamond-like carbon films deposited by laser ablation of C60 fullerene

Carbon films deposited by pulsed ArF laser ablation of a C60 fullerene target were found to have a higher electric field emission current than those films deposited using graphite. The emission current density of the best films produced was 250 mA cm-2 at a field of 50 V µm-1 and yet the films were highly stable. These electron emission characteristics are discussed in terms of the structural properties of films. The effective work function of the electron emission is interpreted as due to the tunnelling length of electrons from the Fermi level of sp2 clusters to the conduction band of sp3 sites.

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