Accession Number:

AD0757097

Title:

On the Interpretation of ac Conductivity in Amorphous Semiconductors,

Descriptive Note:

Corporate Author:

CALIFORNIA UNIV RIVERSIDE DEPT OF PHYSICS

Personal Author(s):

Report Date:

1973-02-01

Pagination or Media Count:

47.0

Abstract:

An extensive survey of the experimental literature on ac conductivity and on the dielectric dispersion in glasses is reported. Research is focused on the region where sigma Aomega to the s power, s approximately equal to 1. 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 approximately equal to 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, while the other group can be explained either by hopping over a barrier, or by phonon assisted hopping with a subsequent lattice relaxation e.g. polaron hopping. Author

Subject Categories:

  • Solid State Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE