Patent ID: 6430033
Filing Date: 2002-08-06
Classification: H01G,Y02E

Abstract:
A solid electrolytic capacitor comprising an oxide dielectric layer, a composite electrically conductive polymer layer structure comprising a plurality of electrically conductive polymer layers, a carbon layer and a silver layer which are sequentially disposed on a surface of an anode body formed of a valve metal, wherein said composite electrically conductive polymer layer structure comprises a first layer of polymer of thiophene or a derivative thereof contacting the oxide dielectric layer, a second layer of a material different from the material of the first layer, said second layer being formed on the first layer by chemical polymerization, and a third layer positioned between said second layer and said carbon layer and formed by electrolytic polymerization;wherein a fourth electrically conductive polymer layer formed by chemical polymerization is interposed between and in contact with said third layer and said carbon layer.