JPH0666223B2 - Capacitor - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a capacitor used in various electronic devices.

2. Description of the Related Art Capacitors used for plastic films, metallized films, ceramics, etc. have been used as dielectrics.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention The present invention provides a new type of capacitor using an organic thin film obtained by electrolytic polymerization without incorporating a dielectric layer as in the above-mentioned example.

Means for Solving the Problems The present invention can be obtained by electropolymerization of a compound containing at least one group of a carbon ring, a nitrogen-containing ring, a selenium-containing ring, an oxygen-containing ring and an amino aromatic ring in a molecule. An organic thin film (hereinafter referred to as an organic thin film unless otherwise specified) that has characteristics of a conductor and a semi-conductive region, but aluminum is vapor-deposited on the film surface to form an electrode, and on the other surface, a metal different from aluminum Is directly attached to form an electrode.

The above-mentioned different metal electrode may be used as a positive electrode material in the shape of a foil or the like during electrolytic polymerization, and a polymer film adhered product may be used as it is, and the polymer film is separated from the metal. Alternatively, the metal film electrode may be newly formed by a vapor deposition method or the like.
Further, these electropolymerized membranes are preliminarily treated with pure water, a pure solvent or the like after production to remove free salts, residual solvents, unreacted monomers and the like, and dried and then subjected to the above-mentioned processing.

Monomers used for electrolytic polymerization include pyrrole, furan, selenophene, paraphenylene, anthracene, azulene, and aniline. Salts used as a supporting electrolyte during electrolytic polymerization include lithium borofluoride, paratoluenesulfonate, and perchloric acid. There are silver, lithium perchlorate, copper chloride, borofluorinated tetrabutylamine, perchlorinated tetrabutylamine and the like, and these may be used alone or in combination. Solvents include benzonitrile, acetonitrile, nitrobenzene, orthodichlorobenzene, dimethylsulfate, water and the like.

Action The inventors of the present invention have conducted various experiments and researches on the system in which aluminum is vacuum-deposited on the film surface of various organic thin film conductors and semiconductor characteristic regions obtained by the above-mentioned electrolytic polymerization. It was confirmed that in the system in which another metal was directly formed on the other surface, a capacitor having an extremely large capacity and a small leakage current was obtained by the electrode action on these organic thin films. In addition, as the above-mentioned different kind of metal, it is preferable to use a metal having a work relationship larger than that of aluminum.

Examples Tables show configurations and characteristics of various capacitors according to Examples.

The polymers of pyrrole, furan, and aniline used here were benzonitrile-lithium perchlorate type, acetonitrile-lithium borofluoride type, respectively. Water-paraphenylene sulfonate system is electropolymerized to have a film thickness of 5 μm, and salt / solvent (ratio) and monomer / solvent (ratio) are both 2
It was set to g / 180 g (ratio). The Ni and Co foils used for the electrode B are both 6 μm thick.

These capacitors are polar, and a higher withstand voltage is obtained when the aluminum electrode side is positive, and the leakage current value in the table is the value in this case.

As is clear from the table, these capacitors show extremely large capacitance and their leakage current is small. Further, the film thickness of the polymer film can be controlled in quantity of electricity by setting conditions during electrolysis, a uniform ultra thin film can be obtained, and a long film having a thickness of 1 μm or more and a wide film can be obtained. Even with this film thickness, the various characteristic values in the table were maintained, and even some of the characteristics were improved. With this film, we were able to manufacture capacitors with a wound structure and a laminated structure.

Similar results were obtained with other organic thin film and electrode material systems.

EFFECTS OF THE INVENTION According to the present invention, a capacitor having a large capacity and a small current leakage can be obtained due to the electrode effect of various organic films, and an ultra-thin polymer film can provide a further compact, lightweight and dry type capacitor. Etc. Its utility value is great.

Claims (1)

[Claims] 1. An electrode made of aluminum on one side of an organic thin film obtained by electrolytic polymerization of a compound containing at least one of a carbon ring, a nitrogen-containing ring, a selenium-containing ring, an oxygen-containing ring and an amino aromatic ring in the molecule. And an electrode made of a metal different from the electrode is provided on the other surface of the organic thin film.