Electrolytic capacitor element having a doped solid electrolyte layer

An electrolytic capacitor element comprising:

• an anode including a valve acting metal substrate and having a front end face and a base end face;
• a dielectric layer on at least one main face of the anode but excluding at least the base end face;
• a mask layer including an insulating material on the dielectric layer adjacent the base end face;
• and
• a cathode on the dielectric layer on the front end face side from the mask layer,
• the cathode including a solid electrolyte layer on the dielectric layer and a conductive layer on the solid electrolyte layer,
• the solid electrolyte layer including a first layer including a first conductive polymer doped with a first dopant and a second layer including a second conductive polymer doped with a second dopant,
• the second layer being partially disposed in a plane of the solid electrolyte layer,
• the first layer being disposed at least in a region in which the second layer is not disposed in the plane of the solid electrolyte layer, and
• the second conductive polymer being more likely to be dedoped than the first conductive polymer.