Method of substrate temperature control during high temperature wet processing
View Patent ↗Methods are provided for processing a substrate in single substrate tool. In one embodiment, the method includes providing the substrate in the single substrate tool, applying a first processing fluid at a first temperature greater than 100° C. to a lower surface of the substrate to heat the substrate to approximately the first temperature, and applying a second processing fluid at a second temperature greater than 100° C. to an upper surface of the substrate.
1. A method for processing a substrate having a nitride film on the upper surface of the substrate in single substrate tool, the method comprising:
providing the substrate having a nitride film on the upper surface of the substrate in the single substrate tool;
applying a first processing fluid at a first temperature greater than 100° C. to a lower surface of the substrate to heat the substrate to approximately the first temperature, wherein the first processing fluid comprises phosphoric acid, sulfuric acid, or a mixture thereof; and
applying a second processing fluid at a second temperature greater than 100° C. to an upper surface of the substrate to etch the nitride film on the upper surface of the substrate, wherein the second processing fluid comprises phosphoric acid, sulfuric acid, or a mixture thereof.
2. The method of claim 1 , wherein applying the first processing fluid is performed before applying the second processing fluid.
3. The method of claim 1 , wherein applying the first processing fluid overlaps in time with applying the second processing fluid.
4. The method of claim 1 , wherein applying the second processing fluid etches a silicon nitride film on the upper surface of the substrate.
5. The method of claim 1 , wherein the chemical composition of the first and second processing fluids are the same.
6. The method of claim 1 , wherein the first and second processing fluids contains only one acid, which acid is phosphoric acid.
7. The method of claim 1 , wherein the first and second temperatures are greater than 130° C.
8. The method of claim 1 , wherein the first and second temperatures are greater than 160° C.
9. The method of claim 1 , wherein the first temperature is greater than the second temperature.
10. The method of claim 1 , wherein the first processing fluid comprises sulfuric acid and the second processing fluid comprises phosphoric acid, and wherein the first temperature is greater than the second temperature.
11. A method for processing a substrate in single substrate tool, the method comprising:
providing the substrate in the single substrate tool;
applying a first processing fluid containing only one acid, which acid is phosphoric acid at a first temperature greater than 100° C. to a lower surface of the substrate to heat the substrate to approximately the first temperature; and
applying a second processing fluid containing only one acid, which acid is phosphoric acid at a second temperature greater than 100° C. to an upper surface of the substrate, wherein applying the second processing fluid etches a silicon nitride film on the upper surface of the substrate.
12. The method of claim 11 , wherein applying the first processing fluid is performed before applying the second processing fluid.
13. The method of claim 11 , wherein applying the first processing fluid overlaps in time with applying the second processing fluid.
14. The method of claim 11 , wherein the first and second temperatures are greater than 130° C.
15. The method of claim 11 , wherein the first and second temperatures are greater than 160° C.
16. The method of claim 1 , wherein the substrate has a nitride film on the lower surface of the substrate, and the first processing fluid etches the nitride film on the lower surface of the substrate.
17. The method of claim 1 , wherein the first processing fluid and the second processing fluid are both free of sulfuric acid.
18. The method of claim 10 , wherein the first processing fluid contains only one acid, which acid is sulfuric acid and the second processing fluid contains a mixture of phosphoric acid and sulfuric acid, and wherein the first temperature is greater than the second temperature.
19. The method of claim 10 , wherein the first processing fluid contains only one acid, which acid is sulfuric acid and the second processing fluid contains only one acid, which acid is phosphoric acid, and wherein the first temperature is greater than the second temperature.