Field emission from dielectric coated metallic cathode surfaces: a theoretical study

In this paper, we develop an exact analytical theory for field emission from dielectric-coated metallic cathode surfaces, by solving the one-dimensional (1D) time-independent Schrödinger equation subject to a double-triangular barrier. The theory includes the effects of cathode properties (work func...

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Bibliographic Details
Published in2021 22nd International Vacuum Electronics Conference (IVEC) pp. 1 - 2
Main Authors Zhou, Yang, Zhang, Peng
Format Conference Proceeding
LanguageEnglish
Published IEEE 27.04.2021
Subjects
analytical solution
Coatings
dielectric coating
Dielectric constant
Electric fields
field emission
field emitter
Metals
Quantum mechanics
Schrödinger equation
Stability analysis
Vacuum electronics
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Summary:In this paper, we develop an exact analytical theory for field emission from dielectric-coated metallic cathode surfaces, by solving the one-dimensional (1D) time-independent Schrödinger equation subject to a double-triangular barrier. The theory includes the effects of cathode properties (work function and Fermi energy), dielectric properties (thickness, dielectric constant, and electron affinity), and applied dc electric field. Our results show that the emission current density from cathodes in certain coating conditions is larger than the bare case. An empirical relation between the threshold dielectric thickness and threshold dielectric constant is given. This work provides insights for designing field emitters of higher efficiency and better stability.
DOI:10.1109/IVEC51707.2021.9722520