CONDUCTION IN PERYLENE-SBF6-, PERYLENE-PF6-, AND PERYLENE-BF4- COMPLEXES

Perylene (Per) was reacted with NO2BF4, NO2PF6, and NO2SbF6 in solid-s olution reactions to produce solvent-free (Per)(2)BF4, (Per)(2)PF6, an d (Per)(2)SbF6. X-ray diffraction identified the unit cells of the com pounds as being orthorhombic in the first two cases and tetragonal in the last case. All of the compounds exhibited an increase in resistanc e with decreasing temperature indicative of a semiconducting type of b ehaviour and had room temperature resistivities of 700 Omega cm, 1.5 O mega cm, and 2.5 Omega cm, respectively. The conduction process has be en analysed by fitting the data with a number of parameters in order t o account for a nonlinearity in the ln rho/rho(0) versus 1/T curves. T he polaronic hopping model employed includes contributions of multipho non processes, and intragrain and intergrain effects, and provides a g ood fit to the resistivity data as well as consistency with the result s of Hall effect measurements.