CHARACTERIZATION OF A TANTALUM CAPACITOR FABRICATED WITH A CONDUCTINGPOLYPYRROLE AS A COUNTER ELECTRODE

A tantalum solid electrolytic capacitor, using a conducting polypyrrol e composite as a counter electrode, has been investigated concerning t he temperature dependence of the series resistance and leakage current . The resistance of the capacitor changes along the curve expected fro m the variable-range-hopping (VRH) process. The conductivity of polypy rrole in the capacitor, estimated from the known VRH parameter of the polymer, coincides with that for polpyrrole synthesized alone. The cur rent-voltage curves for the capacitor follow the Schottky or Pool-Fren kel emission. The capacitor demonstrates the features of an ideal capa citor, indicating a constant capacitance and proportional decrease of impedance with frequency up to the resonance point.