Conductive polymer capacitors have unique characteristics achieved by using electroconductive polymer as electrode material. In a solid-state capacitor comprising a positive and a negative electrode, a dielectric medium, and a solid electrolyte, the solid electrolyte contains an electroconductive polymer as an essential constituent. Electroconductive polymer capacitors do not use liquid electrolyte, so they will not dry out, leak, or suffer gas buildup and burst. The circuit-level benefits of this type of capacitor include low equivalent series resistance (ESR), high ripple current, longer life, and high temperature capability.