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Ab initio study of the effects of thin CsI coatings on the work function of graphite cathodes

Appl. Phys. Lett. 91, 144102 (2007); doi:10.1063/1.2794762

Published 2 October 2007

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Vasilios Vlahos
Interdisciplinary Materials Science, University of Wisconsin, Madison, Wisconsin 53706, USA

John H. Booske
Electrical and Computer Engineering and Interdisciplinary Materials Science, University of Wisconsin, Madison, Wisconsin 53706, USA

Dane Morgan
Materials Science and Engineering and Interdisciplinary Materials Science, University of Wisconsin, Madison, Wisconsin 53706, USA
Cesium-iodide (CsI)-coated graphite cathodes are promising electron sources for high power microwave generators, but the mechanism driving the improved emission is not well understood. Therefore, an ab initio modeling investigation on the effects of thin CsI coatings on graphite has been carried out. It is demonstrated that the CsI coatings reduce the work function of the system significantly through a mechanism of induced dipoles. The results suggest that work function modification is a major contribution to the improved emission seen when CsI coatings are applied to C. ©2007 American Institute of Physics
History: Received 9 August 2007; accepted 17 September 2007; published 2 October 2007
Permalink: http://link.aip.org/link/?APPLAB/91/144102/1
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KEYWORDS and PACS

Keywords
PACS
  • 85.45.-w
    Vacuum microelectronics
  • 84.40.-x
    Radiowave and microwave technology including millimeter wave technology
  • YEAR: 2007

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ISSN:
0003-6951 (print)   1077-3118 (online)
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