Résumé
The author uses a transfermatrix technique to simulate field electronic emission from a flat metal. He compares, in particular, the results provided by this numerical scheme with those predicted by the standard FowlerNordheim equation. He considers for this study electric fields between 1 and 10 V/nm as well as work functions between 1.5 and 5 eV. The results demonstrate that the FowlerNordheim theory and the transfermatrix calculations are globally in good agreement. With the Fermi energy of 10 eV considered in this work, the results provided by the standard FowlerNordheim equation are, however, systematically larger than the quantummechanical result, especially for low values of the work function and for high electric fields. This is essentially due to the fact the standard FowlerNordheim theory relies on the simple JeffreysWentzelKramers Brillouin approximation for evaluating the electronic transmission through the surface barrier of the emitter. A correction factor is thus established that enables the temperaturedependent version of the standard FowlerNordheim equation to match the exact quantummechanical result.
langue originale  Anglais 

Pages (de  à)  758762 
Nombre de pages  5 
journal  Journal of vacuum science and technology B 
Volume  28 
Numéro de publication  4 
Les DOIs  
Etat de la publication  Publié  1 juil. 2010 
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