A general computational method for electron emission and thermal effects in field emitting nanotips

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Electron emission from nanometric size emitters becomes of increasing interest due to its involvement to sharp electron sources, vacuum breakdown phenomena and various other vacuum nanoelectronics applications. The most commonly used theoretical tools for the calculation of electron emission are still nowadays the Fowler-Nordheim and the Richardson-Laue-Dushman equations although it has been shown since the 1990's that they are inadequate for nanometrically sharp emitters or in the intermediate thermal-field regime. In this paper we develop a computational method for the calculation of emission currents and Nottingham heat, which automatically distinguishes among different emission regimes, and implements the appropriate calculation method for each. Our method covers all electron emission regimes (thermal, field and intermediate), aiming to maximize the calculation accuracy while minimizing the computational time. As an example, we implemented it in atomistic simulations of the thermal evolution of Cu nanotips under strong electric fields and found that the predicted behaviour of such nanotips by the developed technique differs significantly from estimations obtained based on the Fowler-Nordheim equation. Finally, we show that our tool can be also successfully applied in the analysis of experimental $I-V$ data.
Original languageEnglish
JournalComputational Materials Science
Volume128
Pages (from-to)15-21
Number of pages7
ISSN0927-0256
DOIs
Publication statusPublished - 17 Feb 2017
MoE publication typeA1 Journal article-refereed

Fields of Science

  • 114 Physical sciences
  • Materials Science

Cite this

@article{4cb7fcf74ead4effa629722765410d6e,
title = "A general computational method for electron emission and thermal effects in field emitting nanotips",
abstract = "Electron emission from nanometric size emitters becomes of increasing interest due to its involvement to sharp electron sources, vacuum breakdown phenomena and various other vacuum nanoelectronics applications. The most commonly used theoretical tools for the calculation of electron emission are still nowadays the Fowler-Nordheim and the Richardson-Laue-Dushman equations although it has been shown since the 1990's that they are inadequate for nanometrically sharp emitters or in the intermediate thermal-field regime. In this paper we develop a computational method for the calculation of emission currents and Nottingham heat, which automatically distinguishes among different emission regimes, and implements the appropriate calculation method for each. Our method covers all electron emission regimes (thermal, field and intermediate), aiming to maximize the calculation accuracy while minimizing the computational time. As an example, we implemented it in atomistic simulations of the thermal evolution of Cu nanotips under strong electric fields and found that the predicted behaviour of such nanotips by the developed technique differs significantly from estimations obtained based on the Fowler-Nordheim equation. Finally, we show that our tool can be also successfully applied in the analysis of experimental $I-V$ data.",
keywords = "114 Physical sciences, Materials Science",
author = "Andreas Kyritsakis and Flyura Djurabekova",
year = "2017",
month = "2",
day = "17",
doi = "10.1016/j.commatsci.2016.11.010",
language = "English",
volume = "128",
pages = "15--21",
journal = "Computational Materials Science",
issn = "0927-0256",
publisher = "Elsevier B. V.",

}

A general computational method for electron emission and thermal effects in field emitting nanotips. / Kyritsakis, Andreas; Djurabekova, Flyura.

In: Computational Materials Science, Vol. 128, 17.02.2017, p. 15-21.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - A general computational method for electron emission and thermal effects in field emitting nanotips

AU - Kyritsakis, Andreas

AU - Djurabekova, Flyura

PY - 2017/2/17

Y1 - 2017/2/17

N2 - Electron emission from nanometric size emitters becomes of increasing interest due to its involvement to sharp electron sources, vacuum breakdown phenomena and various other vacuum nanoelectronics applications. The most commonly used theoretical tools for the calculation of electron emission are still nowadays the Fowler-Nordheim and the Richardson-Laue-Dushman equations although it has been shown since the 1990's that they are inadequate for nanometrically sharp emitters or in the intermediate thermal-field regime. In this paper we develop a computational method for the calculation of emission currents and Nottingham heat, which automatically distinguishes among different emission regimes, and implements the appropriate calculation method for each. Our method covers all electron emission regimes (thermal, field and intermediate), aiming to maximize the calculation accuracy while minimizing the computational time. As an example, we implemented it in atomistic simulations of the thermal evolution of Cu nanotips under strong electric fields and found that the predicted behaviour of such nanotips by the developed technique differs significantly from estimations obtained based on the Fowler-Nordheim equation. Finally, we show that our tool can be also successfully applied in the analysis of experimental $I-V$ data.

AB - Electron emission from nanometric size emitters becomes of increasing interest due to its involvement to sharp electron sources, vacuum breakdown phenomena and various other vacuum nanoelectronics applications. The most commonly used theoretical tools for the calculation of electron emission are still nowadays the Fowler-Nordheim and the Richardson-Laue-Dushman equations although it has been shown since the 1990's that they are inadequate for nanometrically sharp emitters or in the intermediate thermal-field regime. In this paper we develop a computational method for the calculation of emission currents and Nottingham heat, which automatically distinguishes among different emission regimes, and implements the appropriate calculation method for each. Our method covers all electron emission regimes (thermal, field and intermediate), aiming to maximize the calculation accuracy while minimizing the computational time. As an example, we implemented it in atomistic simulations of the thermal evolution of Cu nanotips under strong electric fields and found that the predicted behaviour of such nanotips by the developed technique differs significantly from estimations obtained based on the Fowler-Nordheim equation. Finally, we show that our tool can be also successfully applied in the analysis of experimental $I-V$ data.

KW - 114 Physical sciences

KW - Materials Science

U2 - 10.1016/j.commatsci.2016.11.010

DO - 10.1016/j.commatsci.2016.11.010

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VL - 128

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EP - 21

JO - Computational Materials Science

JF - Computational Materials Science

SN - 0927-0256

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