Solid electrolytic capacitor with highly stable conducting polymer as a counter electrode

We developed a new type of tantalum solid electrolytic capacitor using poly(3,4-ethylenedioxythiophene) (PEDOT) as a counter electrode. The polymer counter electrode was formed on a sintered and anodized tantalum substrate by chemical polymerization. The capacitor was characterized by excellent frequency characteristics and superior durability, due to which it functioned without any deterioration for more than 1000 h at 125°C in air and at 85°C/85%RH.