MAXIMIZING THE PERFORMANCE OF PHOTOCONDUCTORS
Abstract
A simple analysis of the limitations on photoconductivity performance of a sensitive photoconductor like CdS indicates that ultimate likely success in materials control and development will not yield a material with response time less than 1/10-second for .0001 ft-c illumination or lower. The initial stages of success in preparing larger crystals of CdS with impoved photocond ctivity performance for low light intensity excitation have been achieved. Large boules of pure CdS and of CdS with controlled impurities, in sizes of 12 mm in diam. and 40 mm long, have been prepared by sublimation or chemical transport with a moving temper t re gradient. The reality of trap densities of the order of 10 to the 19th power 1/cc in annealed gallium arsenide crystals were substantiated and evidence presented relating these traps to crystal defects. Apparatus capable of measuring mobilities in material with conductivity as low as 10 to the -10ure of surface states. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 30, 1962
- Accession Number
- AD0278050
Entities
People
- J. Blanc
- R.h. Bube
Organizations
- Sarnoff Corporation