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Time Dependence of the Metastable, Optically-Induced Esr in a-Si:H

Published online by Cambridge University Press:  28 February 2011

C. Lee ,
W. D. Ohlsen  and
P. C. Taylor
C. Lee
Affiliation:
Department of Physics, University of Utah, Salt Lake City, UT 84112
W. D. Ohlsen
Affiliation:
Department of Physics, University of Utah, Salt Lake City, UT 84112
P. C. Taylor
Affiliation:
Department of Physics, University of Utah, Salt Lake City, UT 84112
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Abstract

The occurrence of optically-induced, metastable changes in the paramagnetism in films of a-Si:H is well known. The effect was first observed with white light in powdered samples, but recent experiments with both white and monochromatic light incident on films on substrates have observed a similar effect. This optically-induced ESR appears to be stable at temperatures < 400 K. Typical inducing curves for samples with initial dark spin densities ns > 1016 spins/cm3 approach a power law behavior (ns ∼ t1 / 3) at long times. However, when the dark spin density is less than 1016 spins/cm3, the samples exhibit an inducing curve (on a log-log scale) with a continuously decreasing slope. The curve does not exhibit a unique power law behavior over an extended range of time and is at all times < t1 / 3.

Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 70: Symposium E – Materials Issues in Amorphous-Semiconductor Technology , 1986 , 225
Copyright
Copyright © Materials Research Society 1986

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References

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