Abstract
The real part of a.c.conductivity of the pristine and the BF 4 --doped polyacenic semiconductive (PAS) materials prepared by pyrolytic treatment of phenol-formaldehyde resin has been investigated to analyze the a.c. conduction mechanism in these materials. Dependence of this quantity on the frequency (10 1–10 7 Hz) and the temperature (100–330 K) was examined in detail. A series of measurements has revealed that in the pristine PAS samples the carriers are hopping through the quantum-mechanical tunneling process between the spatial sites represented by the localized states near the Fermi level and that the continuous-time random-walk approximation is applicable to the BF 4 --doped PAS samples.
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