Research and Development Final Report, 27 May 1959-27 November 1960.
NUCLEAR CORP OF AMERICA DENVILLE N J
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A study was made of the concept of a novel cold cathode electron power tube category designated COCAT in order to obtain an emission current comparable to or greater than that obtainable using a hot cathode. A detailed study was made on Si in an attempt to determine experimentally those parameters that control and influence the COCAT emission. Emission current was increased by a factor of 10,000 from currents of the order of 10 to the -13th power to a level of 10 to the -9th power as a result of a systematic study of low work function impurities. The 10,000 factor increase in emission was obtained from COCAT junctions prepared by the vapor diffusion at a high temperature of Cs into p-type Si. Simultaneous with the Si COCAT development, an experimental survey was conducted on semiconductor materials other than Si, such as SiC, CdS, ZnO, GaP, AlSb, InP, GaAs, and the rare earth nitrides of Dy, Ho, Yt, and Er. A theoreti al treatment for the COCAT emission current and its associated noise was worked out which involves the adaptation of a modified distribution previously developed for the avalanche breakdown of p-n junctions.