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Space Charge Memory Effect in a-Si:H at low Temperatures

Published online by Cambridge University Press:  15 February 2011

S. Heck,
P. Stradins and
H. Fritzsche
S. Heck
Affiliation:
James Franck Institute, University of Chicago, Chicago, IL
P. Stradins
Affiliation:
James Franck Institute, University of Chicago, Chicago, IL
H. Fritzsche
Affiliation:
Tucson, AZ
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Abstract

Space charges build up near one or both electrodes of a photoconductor unless the thermoionic current balances the photocurrent. Space charges built up also when a voltage U is applied at low T to a semiconductor containing a non-equilibrium distribution of carriers. The presence of a space charge is observed as a relaxation-current transient when the sample is illuminated at zero bias. If one type of carrier is immobile the steady state photocurrent becomes zero.

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References

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