Possible cooling by resonant Fowler-Nordheim emission

A method of electronic refrigeration based on resonant Fowler-Nordheim emis sion is analyzed. In this method, a bulk emitter is covered with a-few-nm-t hick film of a widegap semiconductor, creating an intermediate step between electron energies in the emitter and in vacuum. An external electric field tilts this potential profile, forming a quantum well at the semiconductor- vacuum boundary. Alignment of its lowest two-dimensional subband with the e nergy of the hottest electrons of the emitter (a few k(B)T above the Fermi level) leads to a resonant, selective emission of these electrons, providin g emitter cooling. Calculations show that cooling power of at least 30 W/cm (2), and temperatures down to 10 K may be achieved using this effect. (C) 1 999 American Institute of Physics. [S0003-6951(99)02842-9].