dc transport studies of poly(benzimidazobenzophenanthroline) a ladder-typepolymer

The room-temperature electrical conductivity of poly(benzimidazobenzophenan throline) dramatically increases when heated to 600 K by more than six orde rs in magnitude. The evolution of this significant increase in conductivity is studied closely. The conductivity prior to exposure to the high tempera ture is compared with postheated samples and analyzed in terms of activated and hopping models. The thermally induced electrical conductivity is studi ed for different geometries and significant anisotropic features are observ ed,The variation in the thermally induced conductivity with respect to the ambient renditions is also correlated with the structure. The results revea l contribution of surface processes in the electronic transport. [S0163-182 9(99)06015-4].