Field enhanced thermionic electron emission from sulfur doped nanocrystalline diamond films

F. A.M. Köck, J. M. Garguilo, R. J. Nemanich

Research output: Contribution to journalArticle

10 Scopus citations

Abstract

Thermal activation of field enhancement based emitters can provide efficient means of lowering the emission barrier, thus enabling high current density electron sources. Microwave plasma assisted chemical vapour deposition was employed to synthesize sulfur doped nanocrystalline diamond films with various sulfur/carbon concentrations. Electron emission at elevated temperatures was characterized by direct imaging of the emission utilizing electron emission microscopy. Sulfur doped nanocrystalline diamond films exhibit electron emission from singular sites indicating a non-uniform distribution of the local field enhancement. The threshold field for electron emission changes significantly by varying the sulfur/carbon concentration in the gas phase. At elevated temperatures the emission is strongly enhanced but remains confined to the intense emission sites.

Original languageEnglish (US)
Pages (from-to)704-708
Number of pages5
JournalDiamond and Related Materials
Volume14
Issue number3-7
DOIs
StatePublished - Mar 1 2005
Externally publishedYes

Keywords

  • Doping
  • Energy conversion
  • Nanocrystalline
  • Thermionic emission

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Chemistry(all)
  • Mechanical Engineering
  • Materials Chemistry
  • Electrical and Electronic Engineering

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