The Features of the Current-Voltage Characteristics of Field Emission Metal Cathode Covered by a Nanometer Oxide Layer

Vladimir A. Bespalov; Nikolay A. Djuzhev; Maksim A. Makhiboroda; Gleb D. Demin

doi:10.4028/www.scientific.net/SSP.247.47

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HomeSolid State PhenomenaSolid State Phenomena Vol. 247The Features of the Current-Voltage...

The Features of the Current-Voltage Characteristics of Field Emission Metal Cathode Covered by a Nanometer Oxide Layer

Abstract:

Based on the Sommerfeld free-electron model, the specifics of field emission from metal cathode covered by nanometer oxide layer into vacuum was theoretically studied by the example of systems «W-WO₃-vacuum» and «Al-Al₂O₃-vacuum». The significant influence of natural oxide on the current-voltage (CV) characteristics in the region of strong electric fields (more than 10⁷ V/cm) was investigated, where the transition to the faster current increase in the terms of Fowler-Nordheim (FN) coordinates occurs. At low electric fields (less than 10⁷ V/cm) the CV characteristics may be described by the FN formula for the emission current and can be used to estimate the effective barrier height, which is important in selecting a good cathode material.

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Solid State Phenomena (Volume 247)

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47-53

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.247.47

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Online since:

March 2016

Authors:

Vladimir A. Bespalov*, Nikolay A. Djuzhev, Maksim A. Makhiboroda, Gleb D. Demin

Keywords:

Field Emission, Field Emission Metal Cathode, Thin Metal Oxide, Vacuum

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