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Photoconductivity of Photorefractive Polymers

Published online by Cambridge University Press:  15 February 2011

J. C. Scott
Affiliation:
IBM Research Division, IBM Almaden Research Center, 650 Harry Rd., San Jose, CA 95120–6099
L. Th. Pautmeier
Affiliation:
IBM Research Division, IBM Almaden Research Center, 650 Harry Rd., San Jose, CA 95120–6099
W. E. Moerner
Affiliation:
IBM Research Division, IBM Almaden Research Center, 650 Harry Rd., San Jose, CA 95120–6099
C. A. Walsh
Affiliation:
IBM Research Division, IBM Almaden Research Center, 650 Harry Rd., San Jose, CA 95120–6099
S. M. Silence
Affiliation:
IBM Research Division, IBM Almaden Research Center, 650 Harry Rd., San Jose, CA 95120–6099
T. J. Matray
Affiliation:
IBM Research Division, IBM Almaden Research Center, 650 Harry Rd., San Jose, CA 95120–6099
R. J. Twieg
Affiliation:
IBM Research Division, IBM Almaden Research Center, 650 Harry Rd., San Jose, CA 95120–6099
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Abstract

The photorefractive effect has been recently observed by holographic grating formation in optically non-linear polymers molecularly doped with charge transport agents. Grating formation can be understood as a four-step process, the first three of which dictate the photoconductive response: charge generation, mobility and trapping. The fourth step is modulation of the refractive index by the resulting space-charge field, via the electro-optic effect. We present the results of photoconductivity experiments to determine charge generation efficiency, carrier mobility and the kinetics of recombination and trapping, focussing primarily on the epoxy polymer bisphenol-A-diglycidylether 4-nitro-1, 2-phenylenediaminc (bisA-NPDA) doped with the hole transport agent, diethylaminobenzaldehyde-diphenylhydrazone (DEH). The electric field dependence of the generation efficiency and mobility differ in detail from results on other molecularly doped polymers.

Type
Research Article
Copyright
Copyright © Materials Research Society 1992

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References

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