Photo-stimulated low electron temperature high current diamond film field emission cathode
View Patent ↗An electron source includes a back contact surface having a means for attaching a power source to the back contact surface. The electron source also includes a layer comprising platinum in direct contact with the back contact surface, a composite layer of single-walled carbon nanotubes embedded in platinum in direct contact with the layer comprising platinum. The electron source also includes a nanocrystalline diamond layer in direct contact with the composite layer. The nanocrystalline diamond layer is doped with boron. A portion of the back contact surface is removed to reveal the underlying platinum. The electron source is contained in an evacuable container.
1. An electron source comprising:
a) a back contact surface comprising means for attaching a power source to said back contact surface;
b) a layer comprising platinum in direct contact with said back contact surface;
c) a layer comprising a composite of single-walled carbon nanotubes embedded in a platinum matrix in direct contact with said layer comprising platinum; and,
d) a nanocrystalline diamond layer in direct contact with said composite layer, wherein said nanocrystalline diamond layer comprises boron dopant;
wherein at least a portion of said back contact surface is removed to reveal said layer comprising platinum.
2. The electron source of claim 1 , wherein the back contact surface comprises gold and has a thickness of from about 100 microns to about 1 millimeter.
3. The electron source of claim 1 , wherein said layer comprising platinum is a partially phototransparent layer.
4. The electron source of claim 1 , wherein the doped nanocrystalline diamond layer comprises boron in an amount of from about 7×10 20 cm −3 to about 8×10 21 cm −3 .
5. The electron source of claim 1 , wherein the doped nanocrystalline diamond layer comprises deuterium diffused to a depth of from about 10 angstroms to about 50 angstroms.
6. The electron source of claim 1 , wherein the doped nanocrystalline diamond layer comprises hydrogen-terminated carbon atoms.
7. The electron source of claim 1 , wherein the emitted beam of electrons is of high quality.
8. The electron source of claim 1 , further comprising a power source attached to said back contact surface.
9. The electron source of claim 1 , further comprising an evacuable container for providing a vacuum environment for the electron source.