An Explanation of Anomalous Diffusion Patterns Observed in Electroactive Materials by Impedance Methods

Hop, skip, and jump? Diffusion impedance in disordered systems was used to consider some physical aspects of carrier diffusion in electroactive films. Energy dispersion of ion sites or a distribution of electron sites (traps) is a common feature of these systems. The implications for transport are analyzed with a view to interpreting electrochemical impedance spectra. An explanation is given for anomalous diffusion patterns observed in electroactive materials, and structured impedance spectra (see figure) are described in terms of carrier hopping, trapping, and relaxation in the solid state.