STUDY OF LAYER-LIKE FIELD INHOMOGENEITIES IN CDS USING FRANZ-KELDYSH EFFECT.
DELAWARE UNIV NEWARK DEPT OF PHYSICS
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Some experimentally observed properties of layer-like field inhomogeneities in CdS single crystals are reported. Apparent deviations of the results from the theory proposed by Boer are shown to be resolvable based on a form of layer formation proposed by Voss. The behavior of moving sublayers, observed in moving layer-like field inhomogeneities, is reported. These sublayers are found to cause current oscillations in a range from 2 to 9 Hz with the frequency proportional to the electron density to the 1.3 power. The effect of joule heating in the s shaped range also causes the absorption edge of the entire interelectrode region to periodically shift more than 100A. These periodic transitions are attributed to the repetition of the initiation of current channel formation followed by the formation of unstable layer-like field inhomogeneities. In addition, a new type of field inhomogeneity is reported that forms as a ring around but well-separated from the anode in pure CdS crystals. The properties that distinguish this field inhomogeneity from those already observed are given. The behavior indicates that the crystal current is recombination limited and that the high field anode ring acts as a p-n junction. Author
- Electricity and Magnetism
- Solid State Physics