Abstract: We report on electrical conduction phenomena occurring during high electric field electrode poling of side chain $chi$+(2)$/ polymers. Electric current and second harmonic intensity were measured simultaneously in poling experiments performed on samples with and without an additional inorganic poly-methyl-siloxane layer. Current densities appeared to be limited by a Bardeen-type potential barrier at the electrode/insulator interface. The field dependence of current density was found to be Schottky charge injection for medium field strengths (E$-POL$/ $LSEQ 100 V/$mu@m) 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.!19
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机译：摘要：我们报道了在高电场电极侧链$ chi $ +（2）$ /聚合物极化过程中发生的导电现象。在具有和不具有额外的无机聚甲基硅氧烷层的样品上进行的极化实验中，同时测量电流和二次谐波强度。电流密度似乎受到电极/绝缘体界面处的Bardeen型势垒的限制。发现电流密度的场相关性是中等场强（E $ -POL $ / $ LSEQ 100 V / $ mu @ m）的肖特基电荷注入，而在较高极化场中Fowler-Nordheim隧穿占主导地位。在存在缓冲层的情况下，观察到显着的隧穿抑制作用，这导致奇异击穿事件的可能性降低，并将雪崩介电击穿的极限转移到更高的内部有效极化场！！ 19
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