THE MECHANISM OF ENERGY SPREADING IN CADMIUM SULFIDE CRYSTALS
Journal Article
·
· Phys. and Chem. Solids
In photoconducting phosphors the spreading of the irradiated regions of the crystal plays an important part. It had been established earlier for cadmium sulfide single crystals that besides the energy transfer over only short distances by means of charged particles, still another process must take place in which photoconduction is spread over relatively large distances. It is shown that all the results obtained heretofore can be explained if it is assumed that the process with a large diffusion length results from the scattering and reabsorption of the incident light or the huminescent radiation generated in the crystal. The repeatedly introduced hypothesis of energy conduction by excitons is not supponted by a more precise analysis of the experimental results. The transfer of energy by means of charged particles may be investigated using high- purity crystals which do not absorb their own luminescent radiation, i.e., in which the process of light scattering is nearly eliminated. From the non-linear voltage dependence of the photo-current of a crystal excited at one side only, it is concluded that holes are the determining factor for this energy conduction. The diffusion length is about 1 mu and has a positive temperature coefficient. (auth)
- Research Organization:
- Max-Planck-Gesellschaft, Berlin-Dahlem
- NSA Number:
- NSA-13-000834
- OSTI ID:
- 4295048
- Journal Information:
- Phys. and Chem. Solids, Journal Name: Phys. and Chem. Solids Vol. Vol: 6
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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