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 language | English (US) |
|---|---|
| Pages (from-to) | 2051-2054 |
| Number of pages | 4 |
| Journal | Diamond and Related Materials |
| Volume | 14 |
| Issue number | 11-12 |
| DOIs | |
| State | Published - Nov 2005 |
| Externally published | Yes |
| Event | Proceedings of the 10th International Conference on New Diamond Science and Technology (ICNDST-10) ICNDST-10 Special Issue - Duration: May 11 2005 → May 14 2005 |
Keywords
- CVD
- Doped nanocrystalline diamond
- Energy conversion
- Field emission
- Thermionic emission
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- General Chemistry
- Mechanical Engineering
- Materials Chemistry
- Electrical and Electronic Engineering