Abstract
Based on a random resistor network (RRN), we study the electrical frequency response, including the unusual frequency dependent conductivity and multiple zero crossing of the dielectric function of highly conducting polymers. The electronic transport properties can be studied by modeling the system as a chain-linked granular network, with metallic regions randomly distributed in an amorphous host. Taking into account the contributions of coherent and incoherent transport channels, and the percolation effect of conducting polymers in our RRN model, we can well explain the negative value of ε and the low-energy structure of conducting polymers. The calculated ε(ω) and σ(ω) reproduce the main features of recent broadband optical experiments.
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