Accession Number:

AD0261112

Title:

THE TRANSIENT BEHAVIOR OF CONDUCTIVITY IN PHOTO-CONDUCTORS

Descriptive Note:

Corporate Author:

STANFORD UNIV CALIF STANFORD ELECTRONICS LABS

Personal Author(s):

Report Date:

1961-06-28

Pagination or Media Count:

1.0

Abstract:

Research was concerned with measuring and understanding the variations of electrical conductivity with time in a sintered-layer cadmiumsulfoselenide photoconductor. Primary interest wa focused on the decay of conductivity after a known illuminating source is suddenly removed. Suitable apparatus was assembled to perform the necessary measurements. The techniques e ployed and the associated limitations are discussed. A study of the basic photoconductivity mored in the literature in that the conventional concepts of free carrier lifetime and traps are avoided. Instead, a rigorous solution to equations describing the free-electron recombination rate was derived. Several observations, based upon the evolved concepts, were made and correlated chanism in photoconductors was undertaken, and several theories were te ted. A physical model was found which can explain the salient characteristics of the data. The theory differs from the one currently favored in the literature in that the conventional concepts of free carrier lifetime and traps are avoided. Instead, a rigorous solution to equations describing the free-electron recombination rate was derived. Several observations, based upon the evolved concepts, were made and correlated to the measured data. The most surprising of th se is the implication that the hole c ncentration does not reach equilibrium when light is removed, for perhaps as long as a year. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE