COMPARISON OF THE PROPERTIES OF IODINE-DOPED POLY(N-VINYLCARBAZOLE) (PVK) THIN-FILMS OBTAINED BY EVAPORATION OF PURE POWDER FOLLOWED BY IODINE POSTDEPOSITION DOPING AND IODINE PRE-DOPED POWDER

Poly( N-vinylcarbazole) (PVK) films have been deposited by the thermal evaporation technique. The films were doped with iodine either by usi ng a pre-doped powder or by post-doping of the layer. While there are a lot of pinholes in the films obtained from iodine-doped PVK powder, the morphology of the post-doped films is better, without any inhomoge neities. Also, the iodine content is higher. By comparison to the refe rence powder, the modifications of the properties of the PVK layers in duced by iodine doping after deposition are related to the smallest ch ain length. It is shown that polymerisation of the layer is induced by iodine; this effect is improved by mild heating (T=370 K). (C) 1997 E lsevier Science S.A.