Abstract
The electrostatically activated tunnelling model of conduction in discontinuous films is used to interpret non-ohmic effects. The usual spherical island model is extended to the cases of oblate spheroid and disc shaped islands, and to include the effects of island-substrate contact angle variation. Discrepancies between the full tunnelling theory and experiment are attributed to uncertainty in the determination of structural parameters. An interesting observation is the tendency to constant conductance at high fields with non-zero activation energy.
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