Patent ID: 6436835
Filing Date: 2002-08-20
Classification: C09K,H01L

Abstract:
An abrasive composition for polishing a semiconductor device in the shallow trench isolation process, said composition mainly comprising water, cerium oxide powder (wherein the primary particle size of the cerium oxide powder is in a range of about 0.005 to 0.5 &mgr;m) and one or more water-soluble organic compounds having at least one of a â€”COOH group, a â€”COOMX group (wherein MX is an atom or functional group capable of displacing a H atom to form a salt), a â€”SO3My group (wherein My represents an atom or functional group capable of displacing a H atom to form a salt), wherein when a silicon nitride layer and a silicon oxide layer separately formed on a silicon substrate by the CVD method are independently polished under the same conditions, the ratio of the polishing rate for the latter to the former is 10 or more.