Patent ID: 7163448
Filing Date: 2007-01-16
Classification: H01L

Abstract:
1. In a method for polishing an object to be polished with an irregular surface, having a substrate with convexities and concavities, a stopper layer formed on the convexities of the substrate, and an embedded insulating layer formed to cover the concavities of the substrate and the stopper layer, a chemical/mechanical polishing method for STI comprising: a first polishing step of flattening the embedded insulating layer using a slurry (A) which maintains the polishing speed at 500 Å/min or less and a second polishing step of further polishing the embedded insulating layer to cause the stopper layer on the convexities to be exposed using a slurry (B) which maintains the polishing speed at 600 Å/min or more, wherein the slurry (A) and the slurry (B) both contain the same organic acid salt; and a content of the organic acid salt in the slurry (A) is larger than a content of the organic acid salt in the slurry (B).