Solid electrolytic capacitor with conductive polymer as solid electrolyte and method for fabricating the same
First Claim
1. A solid electrolytic capacitor comprising:
- a valve action metal body as an anode side electrode;
an oxide film as a dielectric obtained by oxidizing a surface of said valve action metal body;
an electron donor organic compound layer formed of an organic compound having an electron donor group covering an entire surface of said oxide film, said electron donor organic compound excluding an ionic surface active agent, a silane coupling agent, an aluminum coupling agent and a titanium coupling agent; and
a conductive polymer layer as a solid electrolyte layer covering an entire surface of said electron donor organic compound layer.
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Accused Products
Abstract
The solid electrolytic capacitor disclosed has an electron donor organic compound layer of an organic compound provided between an oxide film as a dielectric and a conductive polymer layer and a conductive polymer layer as a solid electrolyte layer. In the step of forming the electron donor organic compound layer, the pellet on which the oxide film is formed, is caused to be exposed to vapor of the electron donor organic compound, and this enables the formation of a thin and uniform electron donor organic compound layer on the oxide film irrespective of the kind of electron donor organic compound. The pellet may alternatively be dipped in a solution of the electron donor organic compound. Where the dipping process uses silane coupling agent, aluminum coupling agent or titanium coupling agent, the thin and uniform electron donor organic compound layer can be formed by using alcohol solution or acidic solution of each coupling agent. The solid electrolytic capacitor having such a conductive polymer as a solid electrolyte is free from leakage current increase under high temperature condition.
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Citations
26 Claims
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1. A solid electrolytic capacitor comprising:
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a valve action metal body as an anode side electrode; an oxide film as a dielectric obtained by oxidizing a surface of said valve action metal body; an electron donor organic compound layer formed of an organic compound having an electron donor group covering an entire surface of said oxide film, said electron donor organic compound excluding an ionic surface active agent, a silane coupling agent, an aluminum coupling agent and a titanium coupling agent; and a conductive polymer layer as a solid electrolyte layer covering an entire surface of said electron donor organic compound layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 15, 17, 19, 21, 22, 23, 24, 25, 26)
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11. A method for fabricating the solid electrolytic capacitor having a valve action metal body as an anode side electrode, an oxide film as a dielectric obtained by oxidizing a surface of said valve action metal body, an electron donor organic compound layer formed of an organic compound having an electron donor group and covering an entire surface of said oxide film, and a conductive polymer layer as a solid electrolyte layer covering an entire surface of said electron donor organic compound layer, said method comprising:
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forming said oxide film; forming said electron donor electron compound layer on said oxide film; and forming said conductive polymer layer on said electron donor organic compound layer; said forming said electron donor organic compound layer being carried out by exposing said valve action metal body, after said oxide film has been formed thereon, to vapor of said electron donor organic compound.
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13. A method for fabricating a solid electrolytic capacitor having a valve action metal body as an anode side electrode, an oxide film as a dielectric obtained by oxidizing a surface of said valve action metal body, an electron donor organic compound layer formed of an organic compound having an electron donor group and covering an entire surface of said oxide film, and a conductive polymer layer as a solid electrolyte layer covering an entire surface of said electron donor organic compound layer, said method comprising:
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forming said oxide film; forming said electron donor electron compound layer on said oxide film; and forming said conductive polymer layer on said electron donor organic compound layer; said forming said electron donor organic compound layer being carried out such that said valve action metal layer with the oxide film is dipped in a solution of said organic compound. - View Dependent Claims (14, 16)
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18. A solid electrolytic capacitor comprising:
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a valve action metal body as an anode side electrode; an oxide film as a dielectric obtained by oxidizing a surface of said valve action metal body; a conductive polymer layer as a solid electrolyte layer covering said oxide film so as to expose a portion thereof; and an electron donor organic compound layer formed of an organic compound having an electron donor group and covering said portion of said oxide film exposed from said conductive polymer layer.
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20. A method for fabricating a solid electrolytic capacitor having a valve action metal body as an anode side electrode;
- an oxide film as a dielectric obtained by oxidizing a surface of said valve action metal body;
a conductive polymer layer as a solid electrolyte layer covering said oxide film so as to expose a portion thereof; and
an electron donor organic compound layer formed of an organic compound having an electron donor group and covering said portion of said oxide film exposed from said conductive polymer layer, said method comprising;forming said oxide film; forming said conductive polymer layer on said oxide film so as to expose a portion thereof; and forming said electron donor organic compound layer.
- an oxide film as a dielectric obtained by oxidizing a surface of said valve action metal body;
Specification