Influence of tip geometry on the field emission law from axisymmetric and wall-like emitters
Bogoliubov Laboratory of Theoretical Physics,
Joint Institute for Nuclear Research - 141980 Dubna, Moscow region,
Accepted: 17 December 2009
The Fowler-Nordheim (FN) theory is extended to include a potential distribution outside an axisymmetric ellipsoid and a wall with a semi-elliptical shape. The tips of nanometric radii are considered. The variation in field emission over the surface is accounted for by an effective emission area. The FN slopes are found to be markedly larger in comparison with those predicted by the standard FN theory. Analysis of experimentally observed slopes can provide information about geometrical characteristics of emitters. It is shown that for wall-like emitters the geometrical effects are less pronounced in comparison with the axisymmetric emitters.
PACS: 79.70.+q – Field emission, ionization, evaporation, and desorption / 85.45.Db – Field emitters and arrays, cold electron emitters / 73.43.Cd – Theory and modeling
© EPLA, 2010