Method of fabricating a semiconductor device
First Claim
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1. A method of manufacturing a semiconductor device including a lead-out wiring structure comprising the steps of;
- preparing a semiconductor substrate including at least one circuit component therein and covered with an insulative film at the surface thereof, said insulative film having at least one opening formed therein,depositing a conductive metal film on said semiconductor substrate, said conductive metal film being electrically connected to said semiconductor substrate through said opening in said insulative film, andselectively anode-oxidizing said conductive metal film by applying an electrical voltage between said semiconductor substrate with said conductive metal film and an anode forming solution to form conductive channels in said conductive metal film, said conductive channels being isolated from one another by the resulting oxide of the metal of said conductive metal film.
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Abstract
An integrated circuit device with multi-level interconnection wiring structure built upon the substrate wherein each level is formed of conductor and insulator portions and wherein each level has a surface substantially parallel to the surface of the substrate.
The method of fabricating the above-described device wherein a suitable substance such as aluminum is deposited over the surface of the substrate to form a metal film, and wherein the aluminum or other substance is then selectively anodized into insulating portions around conducting channels.
45 Citations
16 Claims
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1. A method of manufacturing a semiconductor device including a lead-out wiring structure comprising the steps of;
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preparing a semiconductor substrate including at least one circuit component therein and covered with an insulative film at the surface thereof, said insulative film having at least one opening formed therein, depositing a conductive metal film on said semiconductor substrate, said conductive metal film being electrically connected to said semiconductor substrate through said opening in said insulative film, and selectively anode-oxidizing said conductive metal film by applying an electrical voltage between said semiconductor substrate with said conductive metal film and an anode forming solution to form conductive channels in said conductive metal film, said conductive channels being isolated from one another by the resulting oxide of the metal of said conductive metal film. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. In the fabrication of an integrated semiconductor microcircuit wherein PN-junctions are passivated by an insulation layer, and wherein access windows are provided in the insulation layer for permitting ohmic contacts to be made to selected semiconductor regions, the improvement comprising:
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depositing a conductor film on said windowed insulation layer; and electrolytically converting selected portions of said conductor film to a nonconductor. - View Dependent Claims (14, 15)
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16. A method for the selective metallizaiton of a substrate comprising:
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forming an insulation film on said substrate; forming openings in said insulation film at location where electrical contact is desired to subjacent material; depositing a metal film on said insulation film;
selectively masking said metal film to provide a mask pattern corresponding to the desired metallization pattern; andelectrolytically converting the unmasked areas of said metal film to a nonconductor to form an inlaid metallization pattern.
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Specification