Implantation of electrical feed-through conductors
First Claim
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1. A process for implanting solid, dense, metallic feed-through conductors comprising the steps of:
- (a) providing a body, said body having top and bottom major opposed surfaces substantially parallel to each other, an outer peripheral edge area interconnecting said major surfaces, and a plurality of holes therethrough, one of said major surfaces being overlaid by at least a thin film of a conducting metal, said metal being one selected from the group consisting of gold, copper, nickel, chromium, and mixtures and alloys thereof;
(b) positioning said body in a tank parallel to an anode such that said thin film on said major surface faces away from said anode and a space is formed between said body and said anode, the metal of said anode being the same as the metal of said solid, dense, metallic feed-through conductors to be implanted;
(c) surrounding said body and said anode with an electroforming solution, said electroforming solution having therein at least the metal of said solid, dense, metallic feed-through conductors to be implanted;
(d) initiating a flow of bubbles of an inert gas in said space between said body and said anode;
(e) establishing a flow of direct current through said solution, between said anode and said thin film;
(f) forming a solid film bridge of metal across the bottoms of said holes; and
(g) growing solid, dense, metallic implants in said holes from said solid film bridge at the bottoms of said holes to the tops of said holes.
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Abstract
Electrically conductive solid, dense feed-through paths for the high-speed low-loss transfer of electrical signals between integrated circuits of a single silicon-on-sapphire body, or between integrated circuits of several silicon-on-sapphire bodies, are provided by an electroforming method.
101 Citations
22 Claims
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1. A process for implanting solid, dense, metallic feed-through conductors comprising the steps of:
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(a) providing a body, said body having top and bottom major opposed surfaces substantially parallel to each other, an outer peripheral edge area interconnecting said major surfaces, and a plurality of holes therethrough, one of said major surfaces being overlaid by at least a thin film of a conducting metal, said metal being one selected from the group consisting of gold, copper, nickel, chromium, and mixtures and alloys thereof; (b) positioning said body in a tank parallel to an anode such that said thin film on said major surface faces away from said anode and a space is formed between said body and said anode, the metal of said anode being the same as the metal of said solid, dense, metallic feed-through conductors to be implanted; (c) surrounding said body and said anode with an electroforming solution, said electroforming solution having therein at least the metal of said solid, dense, metallic feed-through conductors to be implanted; (d) initiating a flow of bubbles of an inert gas in said space between said body and said anode; (e) establishing a flow of direct current through said solution, between said anode and said thin film; (f) forming a solid film bridge of metal across the bottoms of said holes; and (g) growing solid, dense, metallic implants in said holes from said solid film bridge at the bottoms of said holes to the tops of said holes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A process for implanting solid, dense, copper feed-through conductors comprising the steps of:
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(a) providing a body, said body having top and bottom major opposed surfaces substantially parallel to each other, an outer peripheral edge area interconnecting said major surfaces, and a plurality of holes therethrough, one of said major surfaces being overlaid by at least a thin film of a conducting metal, said metal being one selected from the group consisting of gold, copper, nickel, chromium, and mixtures and alloys thereof; (b) positioning said body in a tank parallel to an anode such that said thin film on said major surface faces away from said anode and a space is formed between said body and said anode, the metal of said anode being copper; (c) surrounding said body and said anode with an electroforming solution, said solution being an aqueous solution consisting essentially, in grams per liter, of from about 220 to about 270 grams of hydrated copper sulfate, from about 5 to about 28 grams of sulphuric acid, from about 0.007 to about 0.013 grams of thiourea, and from about 0.03 to about 1.0 gram of molasses; (d) initiating a flow of bubbles of an inert gas in said space between said body and said anode; (e) establishing a flow of direct current through said solution, between said anode and said thin film; (f) forming a solid film bridge of copper across the bottoms of said holes; and (g) growing solid, dense, copper implants in said holes from said solid film bridge at the bottoms of said holes to the tops of said holes. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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- 21. An electroforming solution, said solution consisting essentially, in grams per liter, of from about 220 grams to about 270 grams hydrated copper sulfate, from about 5 grams to about 28 grams sulfuric acid, from about 0.007 grams to about 0.013 grams thiourea and from about 0.3 to about 1 gram molasses.
Specification