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Enhanced electron emission from coated metal targets: Effect of surface thickness on performance

Authors :
Saibabu Madas
S. K. Mishra
Mousumi Upadhyay Kahaly
Source :
AIP Advances, Vol 8, Iss 3, Pp 035019-035019-12 (2018)
Publication Year :
2018
Publisher :
AIP Publishing LLC, 2018.

Abstract

In this work, we establish an analytical formalism to address the temperature dependent electron emission from a metallic target with thin coating, operating at a finite temperature. Taking into account three dimensional parabolic energy dispersion for the target (base) material and suitable thickness dependent energy dispersion for the coating layer, Fermi Dirac statistics of electron energy distribution and Fowler’s mechanism of the electron emission, we discuss the dependence of the emission flux on the physical properties such as the Fermi level, work function, thickness of the coating material, and operating temperature. Our systematic estimation of how the thickness of coating affects the emission current demonstrates superior emission characteristics for thin coating layer at high temperature (above 1000 K), whereas in low temperature regime, a better response is expected from thicker coating layer. This underlying fundamental behavior appears to be essentially identical for all configurations when work function of the coating layer is lower than that of the bulk target work function. The analysis and predictions could be useful in designing new coated materials with suitable thickness for applications in the field of thin film devices and field emitters.

Subjects

Subjects :
Physics
QC1-999

Details

Language :
English
ISSN :
21583226
Volume :
8
Issue :
3
Database :
Directory of Open Access Journals
Journal :
AIP Advances
Publication Type :
Academic Journal
Accession number :
edsdoj.56406b081d02438f8db8dd63bff55e0c
Document Type :
article
Full Text :
https://doi.org/10.1063/1.5012861