Sulfur doped nanocrystalline diamond films as field enhancement based thermionic emitters and their role in energy conversion

F. A.M. Koeck, R. J. Nemanich

Research output: Contribution to journalConference article

20 Scopus citations

Abstract

Sulfur doped nanocrystalline diamond films, like other nanostructured carbon films, exhibit electron emission characterized by a spatial non-uniformity of the field enhancement factor. While field emission effects are observed at room temperature, an increase in emitter temperature is accompanied by an amplified emission current with a simultaneous drop in the threshold field. At low extraction fields a fit of the emission current to the Richardson equation indicates a material work function of ∼2.5 eV. The Schottky formula describes thermionic emission at a moderate field and is utilized to determine the work function at an electric field of 0.8 V/μm with a value of ∼1.7 eV and a concurrently reduced Richardson constant. This significant difference in the work function of 2.5 and 1.7 eV for 0.5 and 0.8V/μm, respectively can be attributed to field enhancement effects.

Original languageEnglish (US)
Pages (from-to)2051-2054
Number of pages4
JournalDiamond and Related Materials
Volume14
Issue number11-12
DOIs
StatePublished - Nov 1 2005
Externally publishedYes
EventProceedings of the 10th International Conference on New Diamond Science and Technology (ICNDST-10) ICNDST-10 Special Issue -
Duration: May 11 2005May 14 2005

Keywords

  • CVD
  • Doped nanocrystalline diamond
  • Energy conversion
  • Field emission
  • 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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