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The temperature-dependent nonlinear current-voltage characteristics of polyacetylene nanofibres measured by Kaiser and Park (2002 Curr. Appl. Phys. 2 33) are reinterpreted by the model based on quantum-mechanical phonon-assisted tunnelling theory. Assuming that the tunnelling of the charge carriers from dopant molecules to conducting states of polyacetylene dominates the current flow, experimental data are fitted to the temperature-and field-dependent tunnelling rate of charge carriers from localized states to conducting ones computed using multiphonon-assisted tunnelling theory. A good fit of experimental data with simulated results was found in a wide range of temperatures from 2 to 300 K. The same explanation is given for temperature-and field-dependent conductivity measured by Long et al Appl. Phys. Lett. 84 2205 in polyaniline microspheres. From the fit of experimental data with theory, the density of traps taking part in current flow is derived.

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