Semiconductor pitch patterning
A semiconductor pitch patterning can include a method comprising forming a first set of spacers on a surface of a substrate. The method can include directionally depositing a mask material on the first set of spacers and on the surface of the substrate. The method can include selectively depositing a second set of spacers on side surfaces of the first set of spacers and a portion of the mask material in contact with the surface of the substrate. The method can include removing portions of the mask material from the surface of the substrate.
1. A method, comprising:
forming a first set of spacers on a surface of a substrate;
directionally depositing a mask material on the first set of spacers and on the surface of the substrate;
selectively depositing a second set of spacers directly on side surfaces of the first set of spacers and a portion of the mask material in contact with the surface of the substrate; and
removing portions of the mask material from the surface of the substrate.
2. The method of claim 1 , comprising using the second set of spacers to transfer a pattern to an underlying semiconductor material to form at least a portion of a semiconductor device.
3. The method of claim 1 , further comprising removing the first set of spacers.
4. The method of claim 1 , wherein the portions of the mask material that are removed comprises portions of the mask material that are on the surface of the substrate.
5. The method of claim 4 , wherein the portions of the mask material that are removed comprises portions of the mask material that are not covered by the first set of spacers and the second set of spacers.
6. The method of claim 1 , wherein side surfaces of the second set of spacers are generally straight subsequent to the removal of the first set of spacers.
7. The method of claim 1 , wherein a pitch of the second set of spacers is half of a pitch of the first set of spacers.
8. A method, comprising:
forming a set of spacers used to transfer a pattern to an underlying substrate material, wherein forming the set of spacers comprises:
directionally depositing a mask material on a surface of a substrate material and on a top surface of a mask pattern having a particular pitch;
selectively depositing a spacer material on only side surfaces of the mask pattern;
performing an anisotropic removal of the mask material; and
removing the mask pattern such that the set of spacers remain, a pitch of the set of spacers being half of the particular pitch.
9. The method of claim 8 , wherein performing the anisotropic removal of the mask material does not remove any spacer material.
10. The method of claim 9 , wherein the set of spacers is a second set of spacers.
11. The method of claim 10 , wherein the mask pattern comprises a first set of spacers formed of a spacer material.
12. The method of claim 11 , wherein the first set of spacers are formed without performing a dry etch on the spacer material.
13. The method of claim 10 , wherein the second set of spacers comprise silicon nitride, the first set of spacers comprise silicon nitride, and the mask material comprises titanium nitride.
14. A method, comprising:
forming a first set of spacers on a surface of a substrate;
directionally depositing a mask material on the first set of spacers and on the surface of the substrate;
selectively depositing a second set of spacers directly on side surfaces of the first set of spacers and a portion of the mask material in contact with the surface of the substrate;
removing portions of the mask material from the surface of the substrate;
removing the first set of spacers; and
using the second set of spacers to transfer a pattern to an underlying semiconductor material to form at least a portion of a semiconductor device.
15. The method of claim 14 , wherein the portions of the mask material that are removed comprises portions of the mask material that are on the surface of the substrate.
16. The method of claim 15 , wherein the portions of the mask material that are removed comprises portions of the mask material that are not covered by the first set of spacers and the second set of spacers.
17. The method of claim 14 , wherein removing the portions of the mask material comprises anisotropically removing the portions.
18. The method of claim 14 , wherein a pitch of the second set of spacers is different than a pitch of the first set of spacers.
19. The method of claim 14 , wherein removing the portions of the mask material does not remove portions of the first set of spacers.
20. The method of claim 14 , wherein removing the portions of the mask material does not remove portions of the second set of spacers.