Abstract
The influence of potassium deposition on the emission characteristics of field tip emitters with fullerene coatings is studied. It is shown that a three-to fourfold reduction of the typical voltage U 1 required for the given emission current can be attained by rapid deposition of potassium layer with a thickness exceeding a monolayer. The deactivation of emitters at room temperature in the absence of electric field is observed and studied. Presumably, the deactivation is caused by potassium redistribution within the coating and/or the formation of bonds between potassium atoms and fullerene molecules. Deactivation of this type actually comes to an end in one or two days. The deposition of potassium on fullerene coating results in an appreciable (up to 50%) decrease in U 1 of the field emitters even after their long-term (about five days) deactivation.
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