Chemical mechanical planarization composition and method with low corrosiveness
View Patent ↗A CMP composition and associated method are provided that afford good corrosion protection and low defectivity levels both during and subsequent to CMP processing. This composition and method are useful in CMP (chemical mechanical planarization) processing in semiconductor manufacture involving removal of metal(s) and/or barrier layer material(s) and especially for CMP processing in low technology node applications.
1. A composition comprising:
a) a compound selected from the group consisting of a cyanurate and an isocyanurate having general structures as:
where R, R′, and R″ are independently selected from the group consisting of —OH, straight or branched C 1 -C 8 alkyl, and straight or branched C 1 -C 8 alkylol;
b) an abrasive; and
c) an oxidizing agent.
2. The composition of claim 1 further comprising a compound selected from the group consisting of a chelator and a complexing agent.
3. The composition of claim 1 further comprising a surfactant.
4. The composition of claim 1 wherein R, R′, and R″ are independently selected from the group consisting of hydroxyethyl, ethyl, and hydroxyl.
5. The composition of claim 4 wherein the compound is an isocyanurate.
6. The composition of claim 5 wherein the isocyanurate is 1,3,5-tris(2-hydroxy-C 1 -C 4 -alkyl)isocyanurate.
7. The composition of claim 6 wherein the 1,3,5-tris(2-hydroxy-C 1 -C 4 -alkyl)isocyanurate is 1,3,5-tris(2-hydroxyethyl)isocyanurate.
8. A method for chemical mechanical planarization of a surface having at least one feature thereon comprising a barrier layer material, said method comprising the steps of:
A) placing a substrate having the surface having the at least one feature thereon comprising a barrier layer material in contact with a polishing pad;
B) delivering a polishing composition comprising:
a) a compound selected from the group consisting of a cyanurate and a isocyanurate having general structures as:
wherein R, R′, and R′ are independently selected from the group consisting of —OH, straight or branched C1-C8 alkyl, and straight or branched C1-C8 alkylol;
b) an abrasive; and
c) an oxidizing agent;
and
C) polishing the substrate with the polishing composition.
9. The method of claim 8 wherein the barrier layer material is selected from the group consisting of tantalum and tantalum nitride.
10. The method of claim 8 wherein the oxidizing agent is hydrogen peroxide.
11. The method of claim 8 wherein the pH of the polishing composition ranges from 7.1-12.
12. The method of claim 11 wherein the pH ranges from 9.5 to 11.8.
13. The method of claim 8 wherein the compound is an isocyanurate.
14. The method of claim 13 wherein the isocyanurate is 1,3,5-tris(2-hydroxy-C 1 -C 4 -alkyl)isocyanurate.
15. A method for chemical mechanical planarization of a surface having at least one feature thereon comprising a metal, said method comprising the steps of:
A) placing a substrate having the surface having the at least one feature thereon comprising a metal material in contact with a polishing pad;
B) delivering a polishing composition comprising:
a) a compound selected from the group consisting of a cyanurate and a isocyanurate having general structures as:
wherein R, R′, and R′ are independently selected from the group consisting of —OH, straight or branched C1-C8 alkyl, and straight or branched C1-C8 alkylol;
b) an abrasive; and
c) an oxidizing agent;
and
C) polishing the substrate with the polishing composition.
16. The method of claim 15 wherein the metal is selected from the group consisting of tantalum, copper, and tungsten.
17. The method of claim 15 wherein the oxidizing agent is hydrogen peroxide.
18. A composition comprising:
a) an isocyanurate having a general structure as:
where R, R′, and R″ are independently selected from the group consisting of —OH, straight or branched C 1 -C 8 alkyl, and straight or branched C 1 -C 8 alkylol;
b) an abrasive; and
c) an oxidizing agent;
wherein the pH of the composition ranges from 7.1-12.
19. The composition of claim 18 wherein the isocyanurate is 1,3,5-tris(2-hydroxy-C 1 -C 4 -alkyl)isocyanurate.
20. The composition of claim 19 wherein the 1,3,5-tris(2-hydroxy-C 1 -C 4 -alkyl)isocyanurate is 1,3,5-tris(2-hydroxyethyl)isocyanurate.