The mechanism of field emission from a highly P-doped diamond (111) surface has been studied by field/photo emission electron micro-spectroscopy. It was found that field emission peaks were located at -3 to -6 eV with respect to the substrate Fermi level (EF) and that photoemission peaks were located at -1 to +2 eV with respect to the substrate EF. Comparing this with the knowledge of work function and electron affinity of the sample, the mechanism of field emission has been elucidated. Namely, field emitted electrons are tunnel-emitted from states around the surface Ep and there is a large amount of resistive potential drop at the emission site.
- Electron micro-spectroscopy
- Field emission electron microscopy
- Field emission mechanism
- Phosphorous-doped diamond
- Photoemission electron microscopy