Patent ID: 6840971

Claim:
A chemical mechanical polishing system comprising: at least one oxidizing agent; at least one passivation film forming agent; at least one stopping compound that is selected from the group of compounds consisting of N 4 -amine (N,N′-bis-[3-aminopropyl]ethylene diamine), 4,7,10-trioxitridecane-1,13-diamine, 3,3-dimethyl-4,4-diaminodicyclohexylmethane, 2-phenylethylamine, polyetheramines, etheramines, N,N-dimethyldipropylenetriamine, 3-[2-methoxyethoxy]propylamine, dimethylaminopropylamine, 1,4-bis(3-amino propyl)piperazine and mixtures thereof; and alanine wherein the polishing system pH ranges from 4.8 to 7.7.