Formation of Ion Pairs and Carrier Transport in Undoped and Dye-Doped Poly (N-Vinylcarbazole) Films

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Dark conductivities o. of undoped and dye-doped poly(N-vinylcarbazole) (PVK)films have been measured at 298, 276, and 208 K over a wide range of static electricfield E = 10'- 10' V / cm. The observed field dependence of o. follows apparently thef"'-power law, rather than the f"'-power law of the well-known Poole-Frenkel (PF)type expression. Based on these experimental results, we have discussed the field-induced carrier generation processes from "ion pairs" (bound holes-charged acceptors)that are formed by an electron transfer between carbazole-rings and acceptors involved. Here we have taken into account the Onsager "dissociation-association"model to account for the observed electric field dependence of o., in which the dis-sociation of the ion pairs is enhanced by an applied field.[dark conductivity, undoped and dye-doped poly(N-vinylcarbazole) film, forma- l[ Lion of Ton pairs1
社団法人日本物理学会の論文
1991-06-15