CPC H01J 37/073 (2013.01) [H01J 1/14 (2013.01); H01J 1/304 (2013.01); H01J 9/025 (2013.01); H01J 9/042 (2013.01); H01J 37/065 (2013.01); H01J 37/26 (2013.01); H01J 2201/196 (2013.01); H01J 2201/30403 (2013.01); H01J 2201/30426 (2013.01); H01J 2201/30449 (2013.01); H01J 2201/30484 (2013.01); H01J 2201/30492 (2013.01); H01J 2209/0223 (2013.01); H01J 2237/06308 (2013.01); H01J 2237/06316 (2013.01); H01J 2237/06341 (2013.01)] | 15 Claims |
1. An electron emitter comprising:
an emitter tip comprising a single crystal material, wherein:
the emitter tip comprises an apex with a diameter of less than 10 micrometers, and
the single crystal material comprises at least one of tungsten, molybdenum, iridium, or rhenium; and
a work-function-lowering material coated on the apex, wherein the apex coated with the work-function-lowering material has an operating temperature of higher than 700 K.
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