THIN-FILM COLD CATHODES FOR MICROWAVE TUBES.
Abstract
Sintered ZnO layers have been intensively investigated, using both cold-press and hot-press techniques. Ohmic contacts between platinum substrates and the ZnO layers have been studied. The problem of obtaining blocking contacts between the ZnO and evaporated surface films has been studied, and barriers up to 2.7 ev can now be obtained. Evaporated BaO has been investigated as an activator for the surface films. Photo-electric work functions down to 1.75 ev have already been measured, and it is believed possible to reduce the work function down to about one ev by this technique. Life tests on ZnO diodes have continued and indicate no significant change in characteristics after almost 1000 hours of operation. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1964
- Accession Number
- AD0607915
Entities
People
- B. V. Dore
- D. V. Geppert
Organizations
- SRI International