Electric lamp or space discharge component or device manufacturi – Process – With assembly or disassembly
Patent
1995-05-02
1998-02-03
Bradley, P. Austin
Electric lamp or space discharge component or device manufacturi
Process
With assembly or disassembly
445 51, H01J 130, H01J 918
Patent
active
057137757
ABSTRACT:
Improved field-emission devices are based on composing the back contact to the emitter material such that electron-injection efficiency into the emitter material is enhanced. Alteration of the emitter material structure near the contact or geometric field enhancement due to contact morphology gives rise to the improved injection efficiency. The devices are able to emit electrons at high current density and lower applied potential differences and temperatures than previously achieved. Wide-bandgap emitter materials without shallow donors benefit from this approach. The emission characteristics of diamond substitutionally doped with nitrogen, having a favorable emitter/vacuum band structure but being limited by the efficiency of electron injection into it, show especial improvement in the context of the invention. The injection-enhancing contacts can be created by combining the emitter material with an appropriate metal compound and annealing or by conventional dry anisotropic etching or ion bombardment techniques.
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Efremow Nickolay N.
Geis Michael W.
Lyszczarz Theodore M.
Twichell Jonathan C.
Bradley P. Austin
Knapp Jeffrey T.
Massachusetts Institute of Technology
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