Modeling of field-assisted emission from the image states of a glass substrate

A. Mayer, M. S. Chung, N. Kumar, Brock Landon Weiss, N. M. Miskovsky, P. H. Cutler

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

A device has been reported recently in which electrons transit through the image states of a negative-electron-affinity glass substrate before being emitted to the vacuum. The external field required for this emission may be as low as 10 Vcm, which is up to three orders of magnitude lower than the fields encountered with other materials. In order to address what appears to be an essential aspect of this device, we present a modeling of field-assisted emission from the image states of a dielectric substrate. The analysis includes a characterization of the image states and considers direct tunneling and thermal excitation to higher energy levels as possible mechanisms for the emission. The model turns out to provide surface charge densities and emission currents that are in excellent agreement with experiments. For the working conditions of the device, the simulations show that the emission has a dominant thermally enhanced field emission component and that the image states play a significant role in pinning the Fermi level to values that are close to the vacuum level.

Original languageEnglish (US)
Pages (from-to)629-633
Number of pages5
JournalJournal of Vacuum Science and Technology B: Microelectronics and Nanometer Structures
Volume24
Issue number2
DOIs
StatePublished - Mar 1 2006

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Vacuum
Glass
Electron affinity
glass
Substrates
Surface charge
Charge density
Fermi level
Field emission
Electron energy levels
Electrons
negative electron affinity
vacuum
Experiments
field emission
energy levels
excitation
electrons
simulation
Hot Temperature

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Electrical and Electronic Engineering

Cite this

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abstract = "A device has been reported recently in which electrons transit through the image states of a negative-electron-affinity glass substrate before being emitted to the vacuum. The external field required for this emission may be as low as 10 Vcm, which is up to three orders of magnitude lower than the fields encountered with other materials. In order to address what appears to be an essential aspect of this device, we present a modeling of field-assisted emission from the image states of a dielectric substrate. The analysis includes a characterization of the image states and considers direct tunneling and thermal excitation to higher energy levels as possible mechanisms for the emission. The model turns out to provide surface charge densities and emission currents that are in excellent agreement with experiments. For the working conditions of the device, the simulations show that the emission has a dominant thermally enhanced field emission component and that the image states play a significant role in pinning the Fermi level to values that are close to the vacuum level.",
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Modeling of field-assisted emission from the image states of a glass substrate. / Mayer, A.; Chung, M. S.; Kumar, N.; Weiss, Brock Landon; Miskovsky, N. M.; Cutler, P. H.

In: Journal of Vacuum Science and Technology B: Microelectronics and Nanometer Structures, Vol. 24, No. 2, 01.03.2006, p. 629-633.

Research output: Contribution to journalArticle

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AU - Mayer, A.

AU - Chung, M. S.

AU - Kumar, N.

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AU - Cutler, P. H.

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