Phonon-assisted tunneling in charge transport of polypyrrole thin films and nanofibers

This article reinterprets the recent experimental results for temperature and field dependence of conductivity in polypyrrole thin films and nanofibers in the framework of phonon-assisted tunneling electrons from traps into conduction band theories. Our proposed model describes well not only the conductivity dependence with temperature but also the temperature-dependent I-V data using the same set of parameters for characterizing the material. The values of active phonon energy are estimated from the fit of the conductivity dependence on temperature with the theory.