Abstract
A model is presented for the lowering of the work function for high-efficiency electron emission. It is suggested that: (i) an oxide or nitride tetrahedron formation creates nonbonding lone pairs that induce the anti-bonding dipoles associated with density of states added above the Fermi level and; (ii) that nanofabrication could densitify the charges in the confined region due to the coordination number (CN)-imperfection-induced bond contraction. However, over dosing N or O may cause hydrogen-like bond formation with a 'dipole/+' valence state which could explain the reduced work function. Closely packed nanotips also reproduce the work function of a flat surface. It is anticipated that the work function of a surface can be lowered by proper co-doping O or N with metals of low-work function to the miniaturized tips. Predictions agree with various experimental observations.
| Original language | English |
|---|---|
| Pages (from-to) | 381-384 |
| Number of pages | 4 |
| Journal | Solid State Communications |
| Volume | 128 |
| Issue number | 9-10 |
| DOIs | |
| Publication status | Published - Dec 2003 |
| Externally published | Yes |
ASJC Scopus Subject Areas
- General Chemistry
- Condensed Matter Physics
- Materials Chemistry
Keywords
- A. Nanostructures
- B. Electron emission
- D. Chemisorption
- E. Work function