MAXIMIZING THE PERFORMANCE OF PHOTOCONDUCTORS
Abstract
Crystals of CdS havebeen grown both by sublimation techniques and by chemical transport. Still larger crystals are being grown by a combination of these techniques with a moving temperature gradient. Crystals grown by sublimation show potentialities of being quite pure, and trap densities have been obtained without special purity precautions. CuS has been found to co-transport with CdS, and this phenomenon has been used to grow CdS:I:Cu crystals with a higher concentration of Cu than has previously been reported in single crystals. Such crystals may be prepared to show improved performance for low light excitations. The dependence of hole ionization energy of sensitizing centers on impurity concentration in these crystals is of fundamental significance in the problem of impurity interaction. The properties of large CdS crystals grown by Eagle Picher have been examined. The existence of a high-conductivity storage state at low temperatures has been investigated further. The effects of sulfur annealing and copper diffusion in making initially high-conductivity spectrographically pure CdS into low-conductivity crystals with photosensitivity are examined. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 14, 1961
- Accession Number
- AD0265280
Entities
People
- J. Blanc
- W.m. Anderson
Organizations
- Sarnoff Corporation