C. Hagen, G.P.E.M. van Bakel, E. Borgonjen, P. Kruit, V. Kazmiruk, V. Kudryashov
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A novel low-voltage ballistic-electron-emission source
A novel tunnel junction emitter based on ballistic electron transmission through ultra-thin metal foils is proposed as an electron source. From a simple planar tunneling model and Monte-Carlo simulations, we show that either a high-brightness monochromatic electron source can be obtained or a high-current source with energy spread comparable with a field emission source. Freestanding 5 nm thick Pt films were successfully fabricated for the construction of a tunnel junction electron source, in which a UHV-STM is used as a tip-emitter positioning device.
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