Read/Search this Article
Description and empirical analysis of conductivity relaxation for conjugated polymer thin film are reviewed. In frequency domain the conductivity relaxation are described by the complex electric modulus M^* and the complex conductivity σ^*. The M^* is defined the inverse of the complex relative permittivity (dielectric constant) ε^*_τ. The conductivity relaxation are analyzed in detail using the M^* formalism with a Kohlrausch-Williams-Watts (KWW) distribution of relaxation times. This analysis is found to give an excellent description of the M^* data. The σ^* description is shown to be sensitive to an approximation of KWW function using this analysis. In addition to the charge carrier's contribution to the σ^* there is the dielectric polarization and the electrode polarization. It is realized anew that detailed information on the conductivity relaxation mechanisms can be extracted from the M^* description and the M^* formalism.