Chemical mechanical polishing (CMP) composition for shallow trench isolation (STI) applications and methods of making thereof
View Patent ↗Methods for removing, reducing or treating the trace metal contaminants and the smaller fine sized cerium oxide particles from cerium oxide particles, cerium oxide slurry or chemical mechanical polishing (CMP) compositions for Shallow Trench Isolation (STI) process are applied. The treated chemical mechanical polishing (CMP) compositions, or the CMP polishing compositions prepared by using the treated cerium oxide particles or the treated cerium oxide slurry are used to polish substrate that contains at least a surface comprising silicon dioxide film for STI (Shallow trench isolation) processing and applications. The reduced nano-sized particle related defects have been observed due to the reduced trace metal ion contaminants and reduced very smaller fine cerium oxide particles in the Shallow Trench Isolation (STI) CMP polishing.
1. A chemical mechanical polishing (CMP) composition having reduced defects, comprising:
cerium oxide slurry having trace metal contaminants;
polymeric electrolyte;
biocide;
chemical chelator selected from the group consisting of organic acid selected from the group consisting of oxalic acid, citric acid, malic acid, tartaric acid, maleic acid, itaconic acid, gluconic acid, lactic acid, ethylenediaminetetraacetic acid, and combinations thereof; amino acid selected from the group consisting of glycine, alanine, serine, proline, and combinations thereof; organic acid derivative containing at least one carboxylic acid group; amino acid derivative containing at least one amine acid moieties; organic amine compound containing primary or secondary amino groups; organic sulfuric acid containing at least one sulfuric acid group; organic phosphoric acid containing at least one or more phosphoric acid group; organic chelators containing multi-type function groups; pyridine and its derivative selected from the group consisting of pyridine, 2-methyl pyridine, and substituted pyridine at position 2, 3, 4, 5 or 6 respectively, and combinations thereof; bipyridine and its derivative selected from the group consisting of 2,2′-bipyrine, substituted 2,2′-bipyrine, 4,4′-dimethyl bipyridine, 4,4′-bipyridine, 4,4′-bipyridine derivative;
terpyridine and its derivative; quinoline and its derivative; hydroxyl quinoline and its derivative; ammonium hydroxide, and combinations thereof; and
deionized water as a solvent;
wherein the chemical chelator reacts with trace metal ions in trace metal contaminants to form metal ion-chelator complexes.
2. The chemical mechanical polishing (CMP) composition of claim 1 , wherein the chemical mechanical polishing composition comprises is hydroxyl quinoline or its derivative having chemical structure selected from the group consisting of:
and combinations thereof;
wherein R is selected from the group consisting of hydrogen, alkyl, alkoxy, organic group with one or more hydroxyl groups, substituted organic sulfonic acid, substituted organic sulfonic acid salt, substituted organic carboxylic acid, substituted organic carboxylic acid salt, organic carboxylic ester, organic amine groups, and combinations thereof;
R′ and R″ can be the same or different, and are independently selected from the group consisting of hydrogen, alkyl, alkoxy, organic group with one or more hydroxyl groups, substituted organic sulfonic acid, substituted organic sulfonic acid salt, substituted organic carboxylic acid, substituted organic carboxylic acid salt, organic carboxylic ester, organic amine, and combinations thereof.
3. The chemical mechanical polishing (CMP) composition of claim 2 , wherein the hydroxyl quinolone or its derivative is selected from the group consisting of 8-hydroxyl quinoline, 8-hydroxyl quinoline-5-sulfonic acid, and combinations thereof.
4. The chemical mechanical polishing (CMP) composition of claim 1 , wherein the polymeric electrolyte is selected from the group consisting of ammonium salt of polyacrylic acid, ammonium salt of polyvinyl sulfonic acid, ammonium salt of poly(4-styrene sulfonic acid), and combinations thereof.
5. The chemical mechanical polishing (CMP) composition of claim 1 , wherein the polymeric electrolyte is an ammonium salt of polyacrylic acid; the hydroxyl quinolone or its derivative is selected from the group consisting of 8-hydroxyl quinoline, 8-hydroxyl quinoline-5-sulfonic acid, and combinations thereof.
6. A method of chemical mechanical polishing (CMP) a substrate having at least one surface comprising silicon dioxide in Shallow Trench Isolation (STI) process, comprising movably contacting the surface of the substrate with a chemical mechanical polishing (CMP) composition having reduced defects, comprising
cerium oxide slurry having trace metal contaminants;
polymeric electrolyte;
biocide;
chemical chelator selected from the group consisting of organic acid selected from the group consisting of oxalic acid, citric acid, malic acid, tartaric acid, maleic acid, itaconic acid, gluconic acid, lactic acid, ethylenediaminetetraacetic acid, and combinations thereof; amino acid selected from the group consisting of glycine, alanine, serine, proline, and combinations thereof; organic acid derivative containing at least one carboxylic acid group; amino acid derivative containing at least one amine acid moieties; organic amine compound containing primary or secondary amino groups; organic sulfuric acid containing at least one sulfuric acid group; organic phosphoric acid containing at least one or more phosphoric acid group; organic chelators containing multi-type function groups; pyridine and its derivative selected from the group consisting of pyridine, 2-methyl pyridine, and substituted pyridine at position 2, 3, 4, 5 or 6 respectively, and combinations thereof; bipyridine and its derivative selected from the group consisting of 2,2′-bipyrine, substituted 2,2′-bipyrine, 4,4′-dimethyl bipyridine, 4,4′-bipyridine, 4,4′-bipyridine derivative; terpyridine and its derivative; quinoline and its derivative; hydroxyl quinoline and its derivative; ammonium hydroxide, and combinations thereof; and
deionized water as a solvent;
wherein the chemical chelator reacts with trace metal ions in trace metal contaminants to form metal ion-chelator complexes which are easily removed to reduce defects caused by the trace metal contaminants.
7. The method of claim 6 , wherein the chemical mechanical polishing composition comprises is hydroxyl quinoline or its derivative having chemical structure selected from the group consisting of:
and combinations thereof;
wherein R is selected from the group consisting of hydrogen, alkyl, alkoxy, organic group with one or more hydroxyl groups, substituted organic sulfonic acid, substituted organic sulfonic acid salt, substituted organic carboxylic acid, substituted organic carboxylic acid salt, organic carboxylic ester, organic amine groups, and combinations thereof;
R′ and R″ can be the same or different, and are independently selected from the group consisting of hydrogen, alkyl, alkoxy, organic group with one or more hydroxyl groups, substituted organic sulfonic acid, substituted organic sulfonic acid salt, substituted organic carboxylic acid, substituted organic carboxylic acid salt, organic carboxylic ester, organic amine, and combinations thereof;
and the chemical mechanical polishing (CMP) composition is for Shallow Trench Isolation (STI) having reduced defects.
8. The method of claim 7 , wherein the hydroxyl quinolone or its derivative is selected from the group consisting of 8-hydroxyl quinoline, 8-hydroxyl quinoline-5-sulfonic acid, and combinations thereof.
9. The method of claim 6 , wherein the polymeric electrolyte is selected from the group consisting of ammonium salt of polyacrylic acid, ammonium salt of polyvinyl sulfonic acid, ammonium salt of poly(4-styrene sulfonic acid), and combinations thereof.
10. The method of claim 6 , wherein the polymeric electrolyte is an ammonium salt of polyacrylic acid; the hydroxyl quinolone or its derivative is selected from the group consisting of 8-hydroxyl quinoline, 8-hydroxyl quinoline-5-sulfonic acid, and combinations thereof.
11. The method of claim 6 , wherein the method comprises a first step of centrifuging the chemical mechanical polishing (CMP) composition to remove metal ion-chelator complexes.