Electro deposition chemistry
First Claim
1. A method for electrolytic plating of a metal on a semiconductive substrate, comprising:
- connecting the semiconductive substrate to a negative terminal of an electrical power source;
disposing the semiconductive substrate and an anode in a solution comprising metal ions and less than about 0.05 molar concentration of a supporting electrolyte; and
electrodepositing the metal onto the semiconductive substrate from the metal ions in the solution.
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Accused Products
Abstract
The present invention provides plating solutions, particularly metal plating solutions, designed to provide uniform coatings on substrates and to provide substantially defect free filling of small features, e.g., micron scale features and smaller, formed on substrates with none or low supporting electrolyte, i.e., which include no acid, low acid, no base, or no conducting salts, and/or high metal ion, e.g., copper, concentration. Additionally, the plating solutions may contain small amounts of additives which enhance the plated film quality and performance by serving as brighteners, levelers, surfactants, grain refiners, stress reducers, etc.
427 Citations
33 Claims
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1. A method for electrolytic plating of a metal on a semiconductive substrate, comprising:
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connecting the semiconductive substrate to a negative terminal of an electrical power source; disposing the semiconductive substrate and an anode in a solution comprising metal ions and less than about 0.05 molar concentration of a supporting electrolyte; and electrodepositing the metal onto the semiconductive substrate from the metal ions in the solution. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for electrolytic plating of copper on a substrate, comprising:
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connecting the substrate to a negative terminal of an electrical power source; disposing the substrate and an anode in a solution consisting essentially of water, a copper salt, and a supporting electrolyte selected from the group consisting of sulfuric acid, sulfamic acid, fluoboric acid, sulfonic acid, hydrochloric acid, nitric acid, perchloric acid, gluconic acid, and mixtures thereof, wherein the solution comprises less than about 0.05 molar concentration of the supporting electrolyte; and electrodepositing copper metal onto the substrate from the copper salts in the solution. - View Dependent Claims (15, 16, 17)
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18. A solution for electroplating copper onto a substrate, comprising:
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water; greater than about 0.8 molar concentration of a copper salt selected from the group consisting of copper sulfate, copper flouroborate, copper gluconate, copper sulfamate, copper pyrophosphate, copper chloride, copper cyanide, and mixtures thereof; and a supporting electrolyte selected from the group consisting of sulfuric acid, sulfamic acid, fluoboric acid, sulfonic acid, hydrochloric acid, nitric acid, perchloric acid, gluconic acid, and mixtures thereof, wherein the solution comprises less than about 0.05 molar concentration of the supporting electrolyte. - View Dependent Claims (19, 20)
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21. A method for forming a metal film on a semiconductive substrate, comprising:
electrodepositing a metal onto the semiconductive substrate using an electrolyte that contains greater than about 0.8 M of metal ions and about 0.05 M or less of a supporting electrolyte. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
Specification