MULTIPHONON PROCESSES IN THE PHOTOCONDUCTIVITY OF CADMIUM SULFIDE AND CADMIUM SELENIDE SINGLE CRYSTALS.
Abstract
The photoconductivity of single crystals of CdS and CdSe was investigated at 4.2K to ascertain whether the multiphonon process does exist in CdSe, to provide additional evidence of this previously observed phenomenon in CdS, and to show that similar electron and phonon processes were responsible for the multiphonon process in both crystals. Photoconductivity was induced with monochromatic light provided by a 1000 watt tungsten source coupled with a grating monochromator. The photocurrents were measured by a variable electrometer and simultaneously plotted against exciting photon energies by an x-y recorder. Analysis of data has indicated that the multiphonon process does exist in CdSe and that the multiphonon process in both CdS and CdSe can be attributed to similar electron and phonon processes. It was observed in the CdSe data that both free exciton and bound exciton states could act as recombination centers for the multiphonon process; only free excitons seemed to do so in CdS. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1965
- Accession Number
- AD0616683
Entities
People
- James Albert Bell
Organizations
- Air Force Institute of Technology