Work

Reduction of Work Function in Nanostructured Modern Cathodes for the Field Emission (Based on the Example of Tungsten Oxide W18O49 "Nanopencils")

Year: 2025

Type: article

Abstract: Within the framework of a simple analytical model, an expression has been obtained that allows to calculate the work function near the tips of a nanostructured cathodes used in modern field emission devices. Numerical evaluations performed for tungsten oxide W18O49 “nanopencils” show that taking into account the considered decrease in the surface electron gas density near the nanotip leads to a decrease in the “bulk” value of the work function (~4.55 eV) by approximately 10%. This effect must be taken into account when calculating the emission current density according to the Fowler-Nordheim formula. It (as well as the electric field enhancement due to the tip geometry) leads to an increase in the emission current density and a decrease in the emission turn-on field.

Source: Physics and Chemistry of Solid State

DOI: 10.15330/pcss.26.1.190-195

Authors: M.V. Strikha, I.Ye. Oliynyk

Institutions: National Academy of Sciences of Ukraine, Taras Shevchenko National University of Kyiv, V.E. Lashkaryov Institute of Semiconductor Physics

Language: English

Topic: Gyrotron and Vacuum Electronics Research

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: diamond

OpenAlex ID: W4408935607

FWCI: 0.385

Cites:

Cited by: 1

Related to: 10