Accession Number : AD0726644

Title :   Investigation of Solid State Cold Cathodes.

Descriptive Note : Final rept. 16 Mar 70-16 Mar 71,

Corporate Author : RCA ELECTRONIC COMPONENTS PRINCETON N J ELECTRO-OPTICS LAB

Personal Author(s) : Kohn,Elliott S.

Report Date : 27 MAY 1971

Pagination or Media Count : 71

Abstract : Cold cathode emission was obtained from forward biased silicon p-n junctions whose p-surfaces were activated to a state of negative electron affinity. In operation, electrons injected into the p-layer diffuse to the surface where they are emitted into vacuum. A Si:SiO2 structure has been developed to overcome the problems associated with current crowding, and, with this structure, efficiencies (ratio of emitted current to bias current) as high as 10% have been observed. Emitted current densities as large as 225 amps/sq cm and currents as large as 7 mA have been drawn under pulsed conditions while continuous current densities of 1 amp/sq cm and currents of tens of microamperes have been drawn for many hours. The electrical characteristics exhibited space-charge-limited and emission-limited regimes as well as Schottky effect. Calculations made of the current density profiles across the junctions indicate that practical levels of operation can be achieved with reasonably uniform emitted current profiles. The silicon cold cathode may have advantages in applications such as vidicons where some aspects of performance are presently limited by the thermionic cathode. (Author)

Descriptors :   (*CATHODES, SEMICONDUCTOR DEVICES), PHOTOCATHODES, PHOTOELECTRIC EFFECT, SILICON, SILICON DIOXIDE

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE