Interpretation of AC Conductivity in Amorphous Semiconductors,
Abstract
An extensive survey of the experimental literature on ac conductivity and on the dielectric dispersion in glasses is reported. The region where sigma = A(omega squared), s about = 1 is considered. The various materials seem to fall into two groups. The characteristic features of the one are a relative insensitivity of both A and s to temperature, with s about 0.8. In the second group A increases as a high power of T, while s varies from about 1 at low temperatures to about 0.8 at high temperatures. A variety of possible models is examined in some detail. It is found that the behavior of the first group is well explained by phonon assisted hopping. The other group can be explained only when certain correlation effects are taken into account. When this is done, either hopping over a barrier, or phonon assisted hopping with a subsequent lattice relaxation (e.g. polaron hopping), is consistent with the experimental results. (Modified author abstract)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1973
- Accession Number
- AD0769550
Entities
People
- Martin R. Pollak
Organizations
- University of California, Riverside