Abstract
The first part of this paper is devoted to a brief review of the recent experimental evidence that has established the ‘non-metallic’ origin of pre-breakdown electron emission currents. This is followed by a discussion of two new models of the emission mechanism, both of which are based on a composite microstructure consisting of a semiconducting/insulating microinclusion in intimate contact with a metallic substrate electrode. Using a band diagram interpretation, it has been possible to give a new quantitative significance to the linear Fowler-Nordheim current-voltage characteristic that is typical of a high voltage gap.
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