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This paper reviews the electron emission properties of hydrogen terminated diamond surfaces with a negative electron affinity (NEA), and presents the recent development of 10 kV vacuum switches based on diamond PIN junction electron emitters that utilize such NEA surfaces. The background to this topic, including the electron emission mechanism through NEA, the electronic states of diamond with free...
We report on photoemission images from NEA diamond using sub-bandgap and near-bandgap photon energies. Emission can be stimulated with photon wavelengths as low as 365 nm, but the low-energy emission disappears after heating the diamond to 700°C, while emission stimulated with 254 and 224 nm photons remains. In both cases the emission occurs only where the concentration of bulk point defects is low...
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