Cleaning process and apparatus for silicate materials
View Patent ↗A method for treating a surface of a quartz substrate includes preparing a substrate to provide a working surface having an initial roughness; and then ultrasonically acid-etching the working surface to increase the roughness of the working surface by at least about 10%. In one embodiment, the initial surface roughness is greater than about 10 Ra, and in another embodiment the initial surface roughness is greater than about 200 Ra. In a still further embodiment, the initial surface area, if less than about 200 Ra, is increased to greater than about 200 Ra. In other embodiments of the present invention, the working surface roughness is increased by at least about 25% or at least about 50%. Simultaneous with the increase in surface area (as measured by the roughness), the surface defects are reduced to reduce particulate contamination from the substrate.
1. A method of treating a surface of a chamber of an electronic device processing tool, comprising:
a) removing deposits from the surface using at least one chemical agent;
b) positioning a pressurized grit source between about 3 and about 9 inches away from the surface;
c) further positioning the pressurized grit source at an angle of less than about 60° from the surface;
d) roughening the surface using a grit of between about 16 and about 100 mesh size;
e) upon the surface attaining a desired roughness, cleaning the surface using an acidic solution; and
wherein steps b), c) and d) are preceded by roughening the surface using a grit of larger than 16 mesh.
2. The method of claim 1 wherein the step of roughening the surface using a grit of larger than 16 mesh is followed by etching the surface.
3. The method of claim 2 wherein the etching is ultrasonically assisted.
4. The method of claim 1 wherein the pressurized grit source is positioned at an angle of about 45° to the surface.
5. The method of claim 1 wherein the grit is intermediate to 16 and 100 mesh.
6. The method of claim 1 wherein the pressurized grit source is positioned about 6 inches away from the surface.
7. The method of claim 1 wherein the pressurized grit source is positioned at angle of between about 40° to about 50° from the surface.
8. A method of treating a contaminated surface of a chamber of an electronic device processing tool, comprising:
a) removing deposits from the surface using at least one chemical agent;
b) inspecting a roughness of the surface;
c) grit blasting the surface with a grit of larger than 16 mesh;
d) grit blasting the surface with a grit of between about 16 and about 100 mesh; and
e) cleaning the surface using an acidic solution.
9. The method of claim 8 wherein the step of grit blasting the surface using a grit of larger than 16 mesh is followed by etching the surface.
10. The method of claim 9 wherein the etching is ultrasonically assisted.
11. The method of claim 8 wherein a pressurized grit source is positioned at an angle of less than about 60°.
12. The method of claim 8 wherein a pressurized grit source is positioned at an angle of about 45° to the surface.
13. The method of claim 8 wherein the grit of between about 16 and about 100 mesh is intermediate to 16 and 100 mesh.
14. The method of claim 8 wherein a pressurized grit source is positioned about 6 inches away from the surface.
15. The method of claim 8 wherein a pressurized grit source is positioned at angle of between about 40° to about 50° from the surface.