FEF distribution influence on linearity of Fowler-Nordheim plots: Modeling and experiment

Experimental field emission data from large area field emitters (LAFEs) have been analyzed using a “two-class model”, in which some emitters have a field enhancement factor significantly greater than the remainder. Using parameters derived experimentally, corresponding Fowler-Nordheim plots were theoretically predicted and agree adequately with the “kinked” plots observed experimentally. In the analysis of the FN plots, very similar results were obtained when using the Elinson-Spindt formula and when using the Forbes-Deane formula. The experimental research was carried out over a wide range of currents, and the coincidence of experiment and theory supports the general validity of this approach.