Method and composition for polishing a substrate
Polishing compositions and methods for removing conductive materials from a substrate surface are provided. In one aspect, a method is provided for processing a substrate to remove conductive material disposed over narrow feature definitions formed in a substrate at a higher removal rate than conductive material disposed over wide feature definitions formed in a substrate by an electrochemical mechanical polishing technique, and then polishing the substrate by at least a chemical mechanical polishing technique.
1. A method of processing a substrate having a barrier material layer disposed over narrow feature definitions and wide feature definitions and the field areas between the feature definitions and a conductive material layer disposed on the barrier material layer, comprising:
forming a protrusion in residual conductive material disposed over wide feature definitions by a first electrochemical mechanical polishing process to remove bulk conductive material; and
removing the protrusion in the residual conductive material by at least a chemical mechanical polishing technique to expose the underlying barrier material layer on the field areas between the wide and the narrow feature definitions.
2. The method of claim 1 , wherein the first electrochemical mechanical polishing process is performed on a first platen and the chemical mechanical polishing technique is performed on a second platen.
3. The method of claim 1 , wherein the polishing the substrate by at least a chemical mechanical polishing process comprises a second electrochemical mechanical polishing process.
4. The method of claim 1 , further comprising removing at least a portion of the barrier material layer by at least a chemical mechanical polishing technique.
5. The method of claim 4 , wherein the removing the protrusion in the residual conductive material and removing at least a portion of the barrier material layer are performed using the same chemical mechanical polishing technique.
6. The method of claim 1 , wherein the first electrochemical mechanical polishing process comprises a first composition having a first corrosion inhibitor concentration and the at least the chemical mechanical polishing technique comprises a second composition having a second corrosion inhibitor concentration less than the first corrosion inhibitor concentration.
7. The method of claim 1 , wherein the first electrochemical mechanical polishing process comprises a first composition having a first pH level and the at least the chemical mechanical polishing technique comprises a second pH level more acidic than the first pH level.
8. The method of claim 1 , wherein the first electrochemical mechanical polishing process comprises an abrasive containing composition and the at least the chemical mechanical polishing technique comprises an abrasive-free composition.
9. The method of claim 3 , wherein the first electrochemical mechanical polishing process comprises applying a pulse modulation first bias to form the protrusion and the second electrochemical mechanical polishing process comprises applying a second bias to form a protrusion.
10. The method of claim 3 , wherein the second electrochemical polishing process has a composition comprising:
an acid based electrolyte;
a polishing enhancing material selected from the group of a chelating agent, an inorganic or organic acid salt, or combinations thereof;
a corrosion inhibitor;
a solvent; and
a pH adjusting agent to provide a pH between about 3 and about 10.
11. The method of claim 1 , further comprising removing the barrier material layer by at least a chemical mechanical polishing technique.
12. A method of processing a substrate having a conductive material layer disposed thereon over narrow apertures and wide apertures, comprising:
removing conductive material disposed over narrow apertures at a higher removal rate than conductive material disposed over wide apertures by a first electrochemical mechanical polishing technique; and
removing conductive material disposed over wide apertures at a removal rate greater than or equal to the removal rate of conductive material disposed over narrow apertures by a second electrochemical mechanical polishing technique.
13. The method of claim 12 , wherein the first electrochemical mechanical polishing technique comprises a first composition having a first concentration of corrosion inhibitor and the second electrochemical mechanical polishing technique comprises a second composition having a second concentration of corrosion inhibitor less than the first concentration of corrosion inhibitor.
14. The method of claim 13 , wherein the first concentration of corrosion inhibitor comprises about 0.3 wt.% or greater of corrosion inhibitor and the second concentration of corrosion inhibitor comprises about less than about 0.3 wt.% of corrosion inhibitor.
15. The method of claim 12 , wherein the first electrochemical mechanical polishing technique comprises a first composition having a first pH and the second electrochemical mechanical polishing technique comprises a second composition having a second pH more acidic than the first pH.
16. The method of claim 15 , the first electrochemical mechanical polishing technique comprises a first pulse modulation method and the second electrochemical mechanical polishing technique comprises applying bias by a second pulse modulation method.
17. The method of claim 16 , wherein the first pulse modulation technique removes conductive material disposed over narrow apertures at a higher removal rate than conductive material disposed over wide apertures and the second pulse modulation technique removes conductive material disposed over narrow apertures at a lesser removal rate than conductive material disposed over wide apertures.
18. The method of claim 15 , wherein the pulse modulation technique forms a protrusion between 10% and about 60% of a thickness of the conductive material over the wide apertures.
19. The method of claim 12 , wherein the first electrochemical mechanical polishing process comprises an abrasive containing composition and the at least the chemical mechanical polishing technique comprises an abrasive-free composition.
20. The method of claim 19 , wherein the second electrochemical mechanical polishing technique and the removing the barrier material layer are performed on the same platen.