Lower plasma-exclusion-zone rings for a bevel etcher
A lower plasma-exclusion-zone ring for a bevel etcher is provided that is configured to etch a bevel edge of a substrate. The lower plasma-exclusion-zone ring includes a ring-shaped body and a radially-outer stepped surface. The ring-shaped body of the lower plasma-exclusion-zone ring defines an upper surface, a lower surface, a radially inner surface, and a radially outer surface. The radially-outer stepped surface of the lower plasma-exclusion-zone ring extending inwardly into the ring-shaped body between the radially outer surface of the ring-shaped body and the upper surface of the ring-shaped body. The ring-shaped body is made of a material selected from a group consisting of aluminum oxide, aluminum nitride, silicon, silicon carbide, silicon nitride, and yttria.
1. A system for a bevel etcher that is configured to etch a bevel edge of a substrate, the system comprising:
the substrate; and
a lower plasma-exclusion-zone ring supporting the substrate and comprising
a ring-shaped body of the lower plasma-exclusion-zone ring defining
an upper surface,
a lower surface,
a radially inner surface, and
a radially outer surface,
a radially-outer stepped surface of the lower plasma-exclusion-zone ring extending inwardly into the ring-shaped body between the radially outer surface of the ring-shaped body and the upper surface of the ring-shaped body, and
a radially-inner stepped surface disposed under the substrate and extending inwardly into the ring-shaped body between the radially inner surface of the ring-shaped body and the lower surface of the ring-shaped body,
wherein the ring-shaped body is made of a material selected from a group consisting of aluminum oxide, aluminum nitride, silicon, silicon carbide, silicon nitride, and yttria.
2. The system of claim 1 , wherein the radially-outer stepped surface includes:
a first surface parallel to the upper surface of the ring-shaped body and the lower surface of the ring-shaped body; and
a second surface parallel to the radially inner surface of the ring-shaped body and the radially outer surface of the ring-shaped body.
3. The system of claim 1 , wherein:
the bevel etcher is configured to bevel etch the substrate having a single predetermined diameter;
the radially outer surface of the ring-shaped body has a diameter greater than the single predetermined diameter of the substrate; and
the radially inner surface of the ring-shaped body has a diameter less than the single predetermined diameter of the substrate.
4. The system of claim 1 , wherein:
the upper surface of the ring-shaped body is parallel to the lower surface of the ring-shaped body; and
the radially inner surface of the ring-shaped body is parallel to the radially outer surface of the ring-shaped body.
5. The system of claim 1 , wherein the radially-inner stepped surface includes:
a first surface parallel to the upper surface of the ring-shaped body and the lower surface of the ring-shaped body; and
a second surface parallel to the radially inner surface of the ring-shaped body and the radially outer surface of the ring-shaped body.
6. The system of claim 1 , wherein portions of the radially-outer stepped surface located radially inwardly of an outer edge of the substrate define a lower edge exclusion zone.
7. The system of claim 1 , wherein the radially-outer stepped surface underlies an outer peripheral bevel edge of the substrate.
8. The system of claim 1 , wherein the ring-shaped body does not include threaded holes.
9. A bevel etcher comprising:
the system of claim 1 arranged below the substrate; and
an upper plasma-exclusion-zone ring arranged above the substrate.
10. The bevel etcher of claim 9 , further comprising:
an electrode, wherein the lower plasma-exclusion-zone ring is supported on the electrode; and
a dielectric plate, wherein the upper plasma-exclusion-zone ring is supported on the dielectric plate.
11. A lower plasma-exclusion-zone ring for a bevel etcher that is configured to etch a bevel edge of a substrate, the lower plasma-exclusion-zone ring comprising:
a ring-shaped body of the lower plasma-exclusion-zone ring defining:
an upper surface;
a lower surface;
a radially inner surface; and
a radially outer surface; and
a radially-inner stepped surface of the lower plasma-exclusion-zone ring extending inwardly into the ring-shaped body between the radially inner surface of the ring-shaped body and the lower surface of the ring-shaped body,
wherein
a height of the radially-inner stepped surface and a height of the ring- shaped body define a size of a gap between an electrode of the bevel etcher and the substrate,
the size of the cap is greater than zero such that at least a portion of the substrate over the cap does not contact an upper most surface of the electrode, and
the ring-shaped body is made of a material selected from a group consisting of aluminum oxide, aluminum nitride, silicon, silicon carbide, silicon nitride, and yttria.
12. The lower plasma-exclusion-zone ring of claim 11 , wherein the radially-inner stepped surface includes:
a first surface parallel to the upper surface of the ring-shaped body and the lower surface of the ring-shaped body; and
a second surface parallel to the radially inner surface of the ring-shaped body and the radially outer surface of the ring-shaped body.
13. The lower plasma-exclusion-zone ring of claim 11 , wherein:
the bevel etcher is configured to bevel etch the substrate having a single predetermined diameter;
the radially outer surface of the ring-shaped body has a diameter greater than the single predetermined diameter of the substrate; and
the radially inner surface of the ring-shaped body has a diameter less than the single predetermined diameter of the substrate.
14. The lower plasma-exclusion-zone ring of claim 11 , wherein:
the bevel etcher is configured to bevel etch the substrate having a single predetermined diameter;
an outer diameter of an upper inner portion of the ring-shaped body defines a bottom edge exclusion zone,
a width of the bottom edge exclusion zone corresponds to a difference between the single predetermined diameter of the substrate and the outer diameter of the upper inner portion of the ring-shaped body; and
the outer diameter of the upper inner portion of the ring-shaped body is less than a diameter of the radially outer surface and less than the single predetermined diameter of the substrate.
15. The lower plasma-exclusion-zone ring of claim 11 , wherein:
the upper surface of the ring-shaped body is parallel to the lower surface of the ring-shaped body; and
the radially inner surface of the ring-shaped body is parallel to the radially outer surface of the ring-shaped body.
16. The lower plasma-exclusion-zone ring of claim 11 , further comprising a radially-outer stepped surface extending inwardly into the ring-shaped body between the radially outer surface of the ring-shaped body and the upper surface of the ring-shaped body.
17. The lower plasma-exclusion-zone ring of claim 16 , wherein the radially-outer stepped surface includes:
a first surface parallel to the upper surface of the ring-shaped body and the lower surface of the ring-shaped body; and
a second surface parallel to the radially inner surface of the ring-shaped body and the radially outer surface of the ring-shaped body.
18. The lower plasma-exclusion-zone ring of claim 11 , wherein the radially-inner stepped surface is supported on at least one of a dielectric ring and an electrode of the bevel etcher.
19. The lower plasma-exclusion-zone ring of claim 11 , wherein the ring-shaped body is adapted to be removably mounted on and removed from a step of an electrode of the bevel etcher and a step of a dielectric ring of the bevel etcher without requiring removal of the electrode from the bevel etcher.
20. The lower plasma-exclusion-zone ring of claim 11 , wherein the ring- shaped body does not include threaded holes.
21. A bevel etcher comprising:
the lower plasma-exclusion-zone ring of claim 11 arranged below the substrate; and
an upper plasma-exclusion-zone ring arranged above the substrate.
22. The bevel etcher of claim 21 , further comprising:
an electrode, wherein the lower plasma-exclusion-zone ring is supported on the electrode; and
a dielectric plate, wherein the upper plasma-exclusion-zone ring is supported on the dielectric plate.
23. The system of claim 1 , wherein the radially-inner stepped surface is fully disposed under the substrate and radially inward of the bevel edge of the substrate.
24. The system of claim 1 , wherein the radially-outer stepped surface is at least partially disposed under the substrate.
25. The system of claim 1 , further comprising a power electrode and a focus ring, wherein the radially-inner stepped surface receives a portion of the power electrode and a portion of the focus ring.
26. A system comprising:
the lower plasma-exclusion-zone ring of claim 11 ;
the substrate; and
the electrode.
27. A system for a bevel etcher that is configured to etch a bevel edge of a substrate, the system comprising:
the substrate; and
a lower plasma-exclusion-zone ring supporting the substrate and comprising
a ring-shaped body of the lower plasma-exclusion-zone ring defining
an upper surface,
a lower surface,
a radially inner surface, and
a radially outer surface, and
a radially-outer stepped surface of the lower plasma-exclusion-zone ring extending inwardly into the ring-shaped body between the radially outer surface of the ring-shaped body and the upper surface of the ring-shaped body; and
an upper plasma-exclusion-zone ring disposed above the substrate and having a radially outer stepped surface,
wherein
a portion of the radially-outer stepped surface of the lower plasma-exclusion-zone ring is disposed under the substrate,
the radially inner surface is more radially inward than the radially- outer stepped surface of the upper plasma-exclusion-zone ring,
the radially outer surface of the ring-shaped body is more radially outward than the bevel edge of the substrate, and
the ring-shaped body is made of a material selected from a group consisting of aluminum oxide, aluminum nitride, silicon, silicon carbide, silicon nitride, and yttria.