Method and apparatus for final polishing of silicon wafer
View Patent ↗Provided are a method and apparatus for final polishing of a silicon wafer. The method for final polishing includes: within a predetermined period of time remaining before completion of the final polishing, forming a hydrophilic silicon oxide film on a surface of the silicon wafer by using both a polishing slurry and an oxidizing solution as a polishing liquid.
1. A method for final polishing of a silicon wafer, the method comprising: within a predetermined period of time remaining before completion of the final polishing, forming a hydrophilic silicon oxide film on a surface of the silicon wafer by delivering both a polishing slurry and an oxidizing solution to the surface of the silicon wafer; wherein the ratio of the flow rate of the polishing slurry to the flow rate of the oxidizing solution is from 1:1 to 1:5.
2. The method for final polishing according to claim 1 , wherein the predetermined period of time is from 10 seconds to 30 seconds.
3. The method for final polishing according to claim 2 , wherein a thickness of the hydrophilic silicon oxide film is from 1 Å to 10 Å.
4. The method for final polishing according to claim 1 , wherein the oxidizing solution is a hydrogen peroxide solution or ozonated water.
5. The method for final polishing according to claim 4 , wherein a concentration of the hydrogen peroxide solution is from 1% by weight to 10% by weight or a mass concentration of the ozonated water is from 1 ppm to 20 ppm.
6. The method for final polishing according to claim 5 , wherein a thickness of the hydrophilic silicon oxide film is from 1 Å to 10 Å.
7. The method for final polishing according to claim 4 , wherein a thickness of the hydrophilic silicon oxide film is from 1 Å to 10 Å.
8. The method for final polishing according to claim 1 , wherein a flow rate of the oxidizing solution is from 500 ml/min to 3000 ml/min.
9. The method for final polishing according to claim 8 , wherein a thickness of the hydrophilic silicon oxide film is from 1 Å to 10 Å.
10. The method for final polishing according to claim 1 , wherein a thickness of the hydrophilic silicon oxide film is from 1 Å to 10 Å.
11. A method for final polishing of a silicon wafer, the method comprising: within a predetermined period of time remaining before completion of the final polishing, forming a hydrophilic silicon oxide film on a surface of the silicon wafer by using both a polishing slurry and an oxidizing solution; wherein the rotational speed for the polishing is reduced to 1 rpm to 10 rpm; and the pressure for the polishing is not treater than 30 g/cm 2 .
12. The method for final polishing according to claim 11 , wherein a thickness of the hydrophilic silicon oxide film is from 1 Å to 10 Å.
13. The method for final polishing according to claim 11 , wherein the predetermined period of time is from 10 seconds to 30 seconds.
14. The method for final polishing according to claim 11 , wherein the oxidizing solution is a hydrogen peroxide solution or ozonated water.
15. The method for final polishing according to claim 14 , wherein a concentration of the hydrogen peroxide solution is from 1% by weight to 10% by weight or a mass concentration of the ozonated water is from 1 ppm to 20 ppm.
16. The method for final polishing according to claim 11 , wherein a flow rate of the oxidizing solution is from 500 ml/min to 3000 ml/min.