Patent ID: 7534277

Claim:
A slurry composition for secondary polishing of semiconductor wafers which comprises 2˜10% by weight of colloidal silica having an average particle diameter of 30˜80nm as an abrasive, 0.5˜1 5% by weight of ammonia, 0.2˜1% by weight of a hydroxyalkylcellulose-based water-soluble polymeric thickener, 0.03˜0.5% by weight of a polyoxyethylenealkylamine ether-based nonionic surfactant, 0.01˜1% by weight of a quaternary ammonium base and the balance of deionized water, wherein the polyoxyethylenealkylamine ether is represented by the following formula 1: RN(R′O) m (R″O) n (1) wherein R is an alkyl group having 1˜3 carbon atoms, R′ and R″ are each independently an ethylene or isopropylene group, m and n are each independently an integer of from 10 to 80, and m+n is within the range of 20 to 90.