Patent ID: 7485162

Claim:
A polishing composition to be used in polishing for forming wiring in a semiconductor device, the polishing composition comprising: a surfactant; a silicon oxide; at least one selected from the group consisting of carboxylic acid and alpha-amino acid; a corrosion inhibitor; an oxidant; and water; wherein said surfactant contains at least one selected from the compounds, each represented by any of general formulas (1) to (5), and the salts thereof, in general formula (1), R 1 represents an alkyl group having 8 to 16 carbon atoms, R 2 represents a hydrogen atom, a methyl group, or an ethyl group, R 3 represents an alkylene group having 1 to 8 carbon atoms, —(CH 2 CH 2 O) l —, (CH 2 CH(CH 3 )O) m —, or a combination of at least two of those, l and m are integers of 1 to 8 when R 3 represents —(CH 2 CH 2 O) l — or —(CH 2 CH(CH 3 )O) m —, the sum of l and m is 8 or less when R 3 represents the combination of —(CH 2 CH 2 O) l — and —(CH 2 CH(CH 3 )O) m —, and X 1 represents a carboxy group or a sulfone group, and in general formulas (2) to (5), each of R 5 and R 6 represents a hydrogen atom, a hydroxy group, or an alkyl group having 8 to 16 carbon atoms, each of Y 2 and Y 3 represents —(CH 2 CH 2 O) q —, —(CH 2 CH(CH 3 )O) r —, or the combination of —CH 2 CH 2 O) q — and —(CH 2 CH(CH 3 )O) r —, q and r are integers of 1 to 6 when Y 2 or Y 3 represents —(CH 2 CH 2 O) q — or —(CH 2 CH(CH 3 )O) r —, and the sum of q and r is an integer of 6 or less when Y 2 or Y 3 represents the combination of —(CH 2 CH 2 O) q — and —(CH 2 CH(CH 3 )O) r —.