An electrochemical impedance analysis of the doping kinetics of polydicarbazole films is reported. Polymer films of varying thickness were analyzed using an impedance model that considers spatially-restricted diffusion of ionic species. The main bulk parameters for diffusion and charge accumulation during doping were determined from fits. These parameters resulted independent of film thickness after considering the experimental error. The equilibrium (bulk) capacitance C0 varies in the range of 100-800Fcm-3. The chemical diffusion coefficient D varies within the range of 10 -10 to 10-8cm2s-1 and increases as the steady-state potential reaches the oxidation peak potential.
Bibliographical noteFunding Information:
Support of Ministerio de Ciencia y Tecnologı́a (Spain) under project BFM2001-3640 is acknowledged. AZ thanks the Israel Ministry of Infrastructures for support of this research. JPL thanks the support of the Vth Framework European Growth project CHEMAG no. GRD2-2000-30122.
- Doping kinetics
- Ionic diffusion