Semiconductor processing methods
View Patent ↗Embodiments in accordance with the present invention provide for removing organic materials from substrates, for example substrates employed in the fabrication of integrated circuits, liquid crystal displays and the like. Such embodiments also provide for forming self-limiting oxide layers on oxidizable materials disposed on such substrates where such materials are exposed to the methods of the present invention. The methods of the present invention provide for contacting substrates with a solution of ozone, water and a surfactant, the solution being effective for removing organic materials and forming self-limiting oxide layers on oxidizable materials.
1. A semiconductor processing method comprising:
providing a semiconductor substrate comprising a first hydrophobic material, a second hydrophilic material received outwardly of the first hydrophobic material, and a third hydrophobic material received outwardly of the second hydrophilic material;
forming an opening through the third and second materials to the first material; and
exposing the first, second and third materials to a solution comprising ozone, water and a surfactant effective to form an oxide layer on the first hydrophobic material within the opening.
2. The method of claim 1 wherein the exposing is effective to form the oxide layer to be self-limiting in thickness to be less than or equal to 1 nanometer thick.
3. The method of claim 1 wherein the surfactant comprises a non-ionic material.
4. The method of claim 1 wherein the surfactant comprises a quaternary ammonium chloride material.
5. The method of claim 1 wherein the surfactant comprises a non-ionic material selected from the group consisting of an ethoxylated sorbitan monooleate, and functional equivalents of ethoxylated sorbitan monooleate.
6. The method of claim 1 further comprising providing a gaseous atmosphere comprising a concentration of ozone within the process chamber.
7. The method of claim 1 further comprising providing a gaseous atmosphere comprising a concentration of ozone within the process chamber which is greater than concentration of ozone in the solution.
8. The method of claim 1 further comprising providing a gaseous atmosphere comprising a concentration of ozone within the process chamber, the gaseous atmosphere having a pressure in excess of atmospheric pressure.
9. The method of claim 1 wherein the water is deionized water.
10. The method of claim 1 wherein the first hydrophobic material comprises silicon.
11. The method of claim 1 wherein the second hydrophific material comprises silicon oxide.
12. The method of claim 1 wherein the third hydrophobic material comprises silicon.
13. The method of claim 12 wherein the third hydrophobic material comprises polysilicon.
14. The method of claim 1 wherein the exposing comprises spraying the substrate with the solution within a chamber, the spraying comprising maintaining the solution at a first temperature between approximately 20° C. and approximately 95° C., and the chamber at a second temperature between approximately 20° C. and approximately 95° C.
15. The method of claim 14 wherein the first temperature and second temperature are approximately equal.
16. The method of claim 14 wherein the first temperature is higher than the second temperature.
17. The method of claim 14 wherein the first temperature is maintained between approximately 65° C. and approximately 95° C.
18. A semiconductor processing method comprising:
providing a semiconductor substrate comprising a silicon-containing region, a silicon oxide-containing layer received outwardly of the silicon-containing region, and a polysilicon-containing layer received outwardly of the silicon oxide-containing layer;
forming an opening through the polysilicon-containing layer and the silicon oxide-containing layer to the silicon-containing region; and
exposing the polysilicon-containing layer, the silicon oxide-containing layer and the silicon-containing region to a solution comprising ozone, water and a surfactant effective to form a silicon oxide-comprising layer on the silicon-containing region within the opening.
19. The method of claim 18 wherein the exposing is effective to form the silicon oxide-containing layer to be self-limiting in thickness to be less than or equal to 1 nanometer thick.
20. The method of claim 18 wherein the surfactant comprises a non-ionic material.
21. The method of claim 18 wherein the surfactant comprises a quaternary ammonium chloride material.
22. The method of claim 18 wherein the surfactant comprises a non-ionic material selected from the group consisting of an ethoxylated sorbitan monooleate, and functional equivalents of ethoxylated sorbitan monooleate.
23. The method of claim 18 further comprising providing a gaseous atmosphere comprising a concentration of ozone within the process chamber.
24. The method of claim 18 further comprising providing a gaseous atmosphere comprising a concentration of ozone within the process chamber which is greater than concentration of ozone in the solution.
25. The method of claim 18 further comprising providing a gaseous atmosphere comprising a concentration of ozone within the process chamber, the gaseous atmosphere having a pressure in excess of atmospheric pressure.
26. The method of claim 18 wherein the water is deionized water.
27. The method of claim 18 wherein the exposing comprises spraying the substrate with the solution within a chamber, the spraying comprising maintaining the solution at a first temperature between approximately 20° C. and approximately 95° C., and the chamber at a second temperature between approximately 20° C. and approximately 95° C.
28. The method of claim 27 wherein the first temperature and second temperature are approximately equal.
29. The method of claim 27 wherein the first temperature is higher than the second temperature.
30. The method of claim 27 wherein the first temperature is maintained between approximately 65° C. and approximately 95° C.