1 November 1996 Electrical conduction processes and high-electric-field poling in nonlinear optical polymers
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Abstract
We report on electrical conduction phenomena occurring during high electric field electrode poling of side chain (chi) (2) polymers. Electric current and second harmonic intensity were measured simultaneously in poling experiments performed on samples with and without an additional inorganic poly-methyl-siloxane layer. Current densities appeared to be limited by a Bardeen-type potential barrier at the electrode/insulator interface. The field dependence of current density was found to be Schottky charge injection for medium field strengths (EPOL <EQ 100 V/micrometers ) whereas it was dominated by Fowler-Nordheim tunneling at higher poling fields. In the presence of the buffer layer, a significant suppression of tunneling was observed which leads to a reduced probability of singular breakdown events and shifted the limit of avalanche dielectric breakdown to higher internal effective poling fields.
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Manfred Eich, Robert Blum, Martin Sprave, "Electrical conduction processes and high-electric-field poling in nonlinear optical polymers", Proc. SPIE 2852, Nonlinear Optical Properties of Organic Materials IX, (1 November 1996); doi: 10.1117/12.256160; https://doi.org/10.1117/12.256160
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