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A solid electrolytic capacitor has a capacitor element including a metal plate, such as a plate of aluminum, tantalum, niobium or titanium, capable of having a dielectric oxidation layer formed thereon, a resist layer of a desired shape formed on a predetermined portion of the metal plate, a dielect

A solid electrolytic capacitor has a capacitor element including a metal plate, such as a plate of aluminum, tantalum, niobium or titanium, capable of having a dielectric oxidation layer formed thereon, a resist layer of a desired shape formed on a predetermined portion of the metal plate, a dielectric oxidation layer formed on a surface of the metal plate at one portion thereof defined by the resist layer, a polymer layer of a heterocyclic compound such as pyrrole, furan or thiophene formed on the dielectric oxidation layer, a conductive layer formed on the polymer layer, a first terminal attached to another portion of the metal plate defined by the resist layer, and a second terminal attached to the conductive layer. In an embodiment, a plurality of the metal plates are stacked to obtain a capacitor element having a multi-layered structure. In another embodiment, the polymer layer and conductive layer are formed successively to obtain an array-type solid electrolytic capacitor element comprising a single metal plate. In a further embodiment, the polymer layer and conductive layer are formed successively to obtain an array-type solid electrolytic capacitor element comprising stacked metal plates.

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A solid electrolytic capacitor characterized by having a capacitor element comprising: a metal plate capable of having a dielectric oxidation layer formed thereon; an insulator layer of a desired shape formed on a predetermined portion of said metal plate; a dielectric oxidation layer formed on a su

A solid electrolytic capacitor characterized by having a capacitor element comprising: a metal plate capable of having a dielectric oxidation layer formed thereon; an insulator layer of a desired shape formed on a predetermined portion of said metal plate; a dielectric oxidation layer formed on a surface of said metal plate at one portion thereof defined by said insulator layer; a conductive polymer layer formed on said dielectric oxidation layer which is a polymer layer of a heterocyclic compound selected from the group consisting of pyrrole, furan and thiopene formed by electrochemical polymerization in an electrolyte solution containing said heterocyclic compound and supporting electrolyte which either comprises boric acid and any one of the following organic compounds: (1) an aliphatic or aromatic carboxylic acid, or a salt thereof; (2) an aliphatic or aromatic compound having two or more carbonyl radicals, or a salt thereof; (3) an aliphatic or aromatic compound having at least one hydroxyl radical and at least one carboxylic radical, or a salt thereof; and (4) an aliphatic or aromatic compound having at least one amine radical and at least one carboxylic radical, or a salt thereof; or comprises a boron compound obtained by chemically combining boric acid and any of the compounds (1) to (4); a conductive layer formed on said polymer layer; a first terminal attached to another portion of said metal plate defined by said insulator layer; and a second terminal attached to said conductive layer.