Abrasive composition for the integrated circuits electronics industry
View Patent ↗Abrasive composition for the integrated circuits electronics industry comprising an aqueous acid suspension of individualized colloidal silica particles not linked to each other by siloxane bonds and an abrasive surfactant, this abrasive being for mechanical chemical polishing in the integrated circuits industry, comprising a fabric impregnated by such a composition, and a process for mechanical chemical polishing.
1. A process for mechanical chemical polishing in the integrated circuits industry, comprising
rubbing a layer with a support impregnated with an abrasive liquid composition, wherein
said layer is (1) a material selected from the group consisting of silicon oxide, silicon nitride, and a polymer having a low dielectric constant, or (2) one layer of silicon oxide and another layer of silicon nitride, and
said abrasive liquid composition comprises an aqueous acid suspension of
(i) individualized colloidal silica particles not linked to each other by siloxane bonds,
together with (ii) a surfactant, and
wherein said abrasive liquid composition is at a pH of 1–5.
2. The process of claim 1 , wherein said surfactant is an anionic or non-ionic surfactant.
3. The process of claim 2 , wherein said surfactant is anionic.
4. The process of claim 3 , wherein said rubbing is carried out with said individualized colloidal silica particles which have diameters between 12 nm and 100 nm.
5. The process of claim 4 , wherein said pH is between 2 and 3, and
said particle size is between 35 and 50 nm.
6. The process of claim 5 , wherein the concentration by weight of said individualized colloidal silica particles is between 25 and 35% in said aqueous acid suspension.
7. The process of claim 6 , wherein the volumetric concentration of said surfactant is between 0.01% and 1%.
8. The process of claim 5 wherein the volumetric concentration of said surfactant is between 0.001% and 5%.
9. The process of claim 4 wherein the volumetric concentration of said surfactant is between 0.001% and 5%.
10. The process of claim 2 wherein the volumetric concentration of said surfactant is between 0.001% and 5%.
11. The process of claim 2 , wherein the volumetric concentration of said surfactant is between 0.01% and 1%.
12. The process of claim 2 , wherein said rubbing is carried out with said individualized colloidal silica particles which have diameters between 12 nm and 100 nm.
13. The process of claim 12 , wherein said pH is between 2 and 3, and
said particle size is between 35 and 50 nm.
14. The process of claim 13 , wherein the concentration by weight of said individualized colloidal silica particles is between 25 and 35% in said aqueous acid suspension.
15. The process of claim 12 , wherein the concentration by weight of said individualized colloidal silica particles is between 25 and 35% in said aqueous acid suspension.
16. The process of claim 1 , wherein said rubbing is carried out with said individualized colloidal silica particles which have diameters between 12 nm and 100 nm.
17. The process of claim 16 , wherein said pH is between 2 and 3, and
said particle size is between 35 and 50 nm.
18. The process of claim 17 , wherein the concentration by weight of said individualized colloidal silica particles is between 25 and 35% in said aqueous acid suspension.
19. The process of claim 16 , wherein the concentration by weight of said individualized colloidal silica particles is between 25 and 35% in said aqueous acid suspension.
20. The process of claim 16 , wherein the volumetric concentration of said surfactant is between 0.01% and 1%.
21. A process for mechanical chemical polishing in the integrated circuits industry, comprising
rubbing a layer with a support impregnated with an abrasive liquid composition, wherein
said layer is (1) a material selected from the group consisting of silicon oxide, silicon nitride, and a polymer having a low dielectric constant, or (2) one layer of silicon oxide and another layer of silicon nitride, and
said abrasive liquid composition consists essentially of an aqueous acid suspension of
(i) individualized colloidal silica particles not linked to each other by siloxane bonds,
together with (ii) a surfactant, and
wherein said abrasive liquid composition is at a pH of 1–5.
22. The process of claim 21 , wherein said surfactant is an anionic or non-ionic surfactant.
23. The process of claim 21 , wherein the pH is between 2 and 3.
24. A process for mechanical chemical polishing in the integrated circuits industry, comprising
rubbing a layer with a support impregnated with an abrasive liquid composition, wherein
said layer comprises one layer of silicon oxide and another layer of silicon nitride, and
said abrasive liquid composition is an aqueous acid suspension, having a pH of 1–5, of
(i) individualized colloidal silica particles not linked to each other by siloxane bonds,
together with (ii) a surfactant,
wherein said abrasive liquid composition is substantially free of other components.