Abstract
In order to elucidate the trapping sites which serve an important role in the switching of poly-N-vinylcarbazole (PVCz), the effects of the molecular weight and the method of polymerization on the threshold voltage of switching was studied. The trap density was also determined from the threshold voltage. Polymerization was initiated by α,α′-azobisisobutyronitrile (AIBN) or γ-ray irradiation. The trap density was larger for lower molecular weight PVCz than for higher molecular weight materials. PVCz prepared by AIBN initiator had a trap density larger than that made by γ-ray initiation when both polymers had the same molecular weight. Doping of iodine onto PVCz increased the trap density; however, doping of tetramethyl-p-phenylenediamine or 1,5-diaminonaphthalene had no such effect. Heat treatment of PVCz seemed to have some effect on the switching characteristics.
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Sakai, Y., Sadaoka, Y. & Okada, G. Switching in Poly-N-vinylcarbazole Thin Films Effect of Molecular Weight and Impurities. Polym J 15, 195–199 (1983). https://doi.org/10.1295/polymj.15.195
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DOI: https://doi.org/10.1295/polymj.15.195