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

F. A M Koeck, Robert Nemanich

Research output: Contribution to journalArticle

19 Citations (Scopus)

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 2005
Externally publishedYes

Fingerprint

thermionic emitters
Diamond films
energy conversion
diamond films
Energy conversion
Sulfur
sulfur
augmentation
Thermionic emission
Carbon films
thermionic emission
Electron emission
nonuniformity
Field emission
electron emission
field emission
emitters
Electric fields
Temperature
thresholds

Keywords

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

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry
  • Surfaces, Coatings and Films
  • Surfaces and Interfaces

Cite this

Sulfur doped nanocrystalline diamond films as field enhancement based thermionic emitters and their role in energy conversion. / Koeck, F. A M; Nemanich, Robert.

In: Diamond and Related Materials, Vol. 14, No. 11-12, 11.2005, p. 2051-2054.

Research output: Contribution to journalArticle

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