Oxalic acid as a semiaqueous cleaning product for copper and dielectrics
First Claim
1. A semiaqueous cleaning composition for use with aluminum, copper, and low-k substrates, the cleaning composition comprising between about 1% to about 30% oxalic acid dihydrate, between about 0.1% and about 30% of an amine, and water, wherein the cleaning composition contains less than about 0.5% fluorine-containing compounds and less than 0.5% peroxides.
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Abstract
The present invention provides a semiaqueous cleaning composition for use with aluminum, copper, and low-k substrates, the cleaning composition comprising between about 1% to about 30% oxalic acid dihydrate, between about 0.1% and about 30% of an amine, and water, wherein the cleaning composition contains less than about 0.5% fluorine-containing compounds and less than 0.5% peroxides.
142 Citations
35 Claims
- 1. A semiaqueous cleaning composition for use with aluminum, copper, and low-k substrates, the cleaning composition comprising between about 1% to about 30% oxalic acid dihydrate, between about 0.1% and about 30% of an amine, and water, wherein the cleaning composition contains less than about 0.5% fluorine-containing compounds and less than 0.5% peroxides.
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25. A semiaqueous cleaning composition for use with aluminum, copper, and low-k substrates, the cleaning composition comprising between about 7% to about 13% oxalic acid dihydrate, about 10% to about 15% tetramethylammonium hydroxide, and about 65% to about 85% water.
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32. A method of cleaning a semiconductor substrate comprising:
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contacting the substrate with a semiaqueous cleaning composition comprising between about 7% to about 13% oxalic acid dihydrate, about 2% to about 8% tetramethylammonium hydroxide, and about 80% to about 90% water for between about 5 minutes and about 60 minutes and at a temperature of between about 20 C to about 85 C; and
rinsing the cleaned substrate to remove the cleaning composition.
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33. A method of cleaning a semiconductor substrate comprising:
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contacting the substrate with a semiaqueous cleaning composition comprising between about 1% to about 30% oxalic acid dihydrate, between about 0.1% and about 10% of ammonia hydroxide, and water for between about 5 minutes and about 60 minutes and at a temperature of between about 20 C to about 85 C; and
rinsing the cleaned substrate to remove the cleaning composition.
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34. A method of cleaning a semiconductor substrate comprising:
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contacting the substrate with a semiaqueous cleaning composition comprising between about 1% to about 30% oxalic acid dihydrate, between about 0.1% and about 25% of hydroxyamines or salts thereof, and water, wherein the cleaning composition contains less than about 0.5% fluorine-containing compounds and less than 0.5% peroxides for between about 5 minutes and about 60 minutes and at a temperature of between about 20 C to about 85 C; and
rinsing the cleaned substrate to remove the cleaning composition.
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35. A method of cleaning a semiconductor substrate comprising:
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contacting the substrate with a semiaqueous cleaning composition comprising about 3% to about 15% oxalic acid dihydrate, wherein the pH of the composition is between about 1 and about 12, for between about 5 minutes and about 60 minutes and at a temperature of between about 20 C to about 85 C; and
rinsing the cleaned substrate to remove the cleaning composition.
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Specification