Process for treatment of substrates with water vapor or steam
View Patent ↗A method of treating a substrate comprises, in one aspect, placing a substrate having material on a surface thereof in a treatment chamber; directing a stream of a liquid treatment composition to impinge the substrate surface; and directing a stream of water vapor to impinge the substrate surface and/or to impinge the liquid treatment composition. A preferred aspect of this invention is the removal of materials, and preferably photoresist, from a substrate, wherein the treatment composition is a liquid sulfuric acid composition comprising sulfuric acid and/or its desiccating species and precursors. In another aspect, a liquid sulfuric acid composition comprising sulfuric acid and/or its desiccating species and precursors are dispensed onto a portion of the substrate surface that is less than the entire surface of the substrate in an amount effective to treat the portion of the substrate surface, and the liquid sulfuric acid composition is exposed to water vapor in an amount effective to increase the temperature of the liquid sulfuric acid composition above the temperature of the liquid sulfuric acid composition prior to exposure to the water vapor. The substrate may be enveloped with a water vapor and/or a optionally nitrogen gas environment during the treatment steps.
1. A method of removing material from a substrate, comprising
a) placing a substrate having material on a surface thereof in a treatment chamber;
b) dispensing a liquid sulfuric acid composition comprising sulfuric acid and/or its desiccating species and precursors onto a portion of the substrate surface that is less than the entire surface of the substrate in an amount effective to treat the portion of the substrate surface; and
c) exposing the liquid sulfuric acid composition to water vapor in an amount effective to increase the temperature of the liquid sulfuric acid composition above the temperature of the liquid sulfuric acid composition prior to exposure to the water vapor;
wherein the liquid sulfuric acid composition at the time of exposure to water vapor has a water/sulfuric acid molar ratio of no greater than about 5:1.
2. The method of claim 1 , wherein the liquid sulfuric acid composition is exposed to water vapor in an amount effective to increase the temperature of the liquid sulfuric acid composition on the substrate surface above both (i) the temperature of the on-substrate liquid sulfuric acid composition prior to exposure to the water vapor and (ii) the temperature of the water vapor.
3. The method of claim 1 , wherein the liquid sulfuric acid composition at the time of exposure to water vapor has a water/sulfuric acid molar ratio of no greater than about 2:1.
4. The method of claim 1 , wherein an oxidizing agent is introduced into the treatment chamber during or after dispense of the liquid sulfuric acid composition.
5. The method of claim 2 , wherein the liquid sulfuric acid composition is dispensed at a temperature of from about 130° C. to about 200° C. prior to exposure to the water vapor.
6. The method of claim 3 , wherein the material is a photoresist.