A new surface electron-emission mechanism in diamond cathodes

Article Abstract:

Conventional cathodes use heat, and lack dimensional stability and power efficiency. Cold cathodes obtain emission using a large electric field. Electrons tunnel into a vacuum over a potential barrier. Diamond cathodes can exhibit very low operational voltages. These cathodes use a mechanism whereby electrons tunnel into diamond surface states. They are then accelerated until they achieve energies which allow them to be pushed out into a vacuum.

Diamonds

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Low-threshold cold cathodes made of nitrogen-doped chemical-vapour-deposited diamond

Article Abstract:

Low-threshold cold cathodes, made of nitrogen-doped, chemical-vapor-deposited diamond, in vacuum diodes emit electrons spontaneously. High concentrations of nitrogen can be included in diamond films with the application of urea as the gaseous nitrogen source. The heavily doped diamond films show very-low-threshold electron emission and are useful in cold-cathode technology. The cold cathodes will eliminate the intricacies of cathode switching.

Surfaces (Materials), Chemical vapor deposition, Surfaces (Technology), Diamond films

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Carbon nanotubes as cold cathodes

Article Abstract:

A microwave diode that uses a cold-cathode electron source consisting of carbon nanotubes and that operates at high frequency and at high current densities is described. A microwave diode in which the carbon-nanotube field-emission source is directly driven at gigahertz (GHz) frequencies is constructed.

United Kingdom, Semiconductors and related devices, Semiconductor and Related Device Manufacturing, Diodes, Diodes & Rectifiers, Design and construction, Nanotubes

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