THE TEMPERATURE-DEPENDENCE OF CONDUCTIVITY ANISOTROPY IN INTERMEDIATELY DOPED POLYACETYLENE

The temperature dependence of electrical conductivity and conductivity anisotropy of FeCl3 doped stretch-oriented polyacetylene film at different doping levels were measured by using Montgomery technique. The increase of conductivity anisotropy upon doping is related to the aligned fibrillar structure and the interfibrillar contact effect. Weak temperature dependence, the slight decrease at low temperature and the persistence of anisotropy through aging indicate that the interfibrillar contact barriers limit the quasi-one-dimensional charge transport in heavily doped polyacetylene and play a major role in the conductivity anisotropy.