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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...
Compact high‐voltage power switches are highly desirable for intelligent power grids with renewable energy sources. A compact high voltage switch using electron emitters, which cannot be realized with conventional semiconductor devices, has been proposed (see the Feature Article by Takeuchi et al., pp. 1961–1975), utilizing the insulating effect of a vacuum. The cover fi gure shows the fi rst result...
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