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Technical Physics
Published in: Technical Physics 10/2019

01-10-2019 | PHYSICAL ELECTRONICS

Ten Approaches to Define the Field Emission Area

Authors: E. O. Popov, A. G. Kolosko, M. A. Chumak, S. V. Filippov

Published in: Technical Physics | Issue 10/2019

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Abstract

The emission area is one of the main parameters of field emission systems. A variety of formal determination techniques for the emission area is studied. Using the model hemisphere-on-cylindrical-post constructed with the COMSOL Multiphysics software package, the relation between well-known estimates of the emission area is shown. The corresponding fractions of the emission currents are computed. It is demonstrated that the formal emission area (the ratio of the total current to the current density at the vertex) ensures approximately 75% of the emission current. The effect of abnormal behavior on the effective emission area is obtained (cutoff from the trend line of the current–voltage characteristics) for varying voltage level in standard Fowler–Nordheim coordinates. An experimental assessment of the area with application of modified Fowler–Nordheim coordinates ln(I/U2–η/6) vs 1/U is proposed. The method is applied for analysis of field emission data of the multipoint nanocomposite emitter with carbon nanotubes.
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Metadata
Title
Ten Approaches to Define the Field Emission Area
Authors
E. O. Popov
A. G. Kolosko
M. A. Chumak
S. V. Filippov
Publication date
01-10-2019
Publisher
Pleiades Publishing
Published in
Technical Physics / Issue 10/2019
Print ISSN: 1063-7842
Electronic ISSN: 1090-6525
DOI
https://doi.org/10.1134/S1063784219100177

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