Patent ID: 6936480
Filing Date: 2005-08-30
Classification: B24B,H01L

Abstract:
1. A method of chemically mechanically polishing a patterned surface of a substrate, the surface having formed thereon a first layer and a second layer, the method comprising: determining a thickness of the first layer at a predefined region of the substrate; determining a thickness of the second layer at the predefined region; estimating a polish time on the basis of the determined thickness of the first and second layers, a removal rate for material of one of the first and second layers and a selectivity factor specifying a removal rate for material of the first layer with respect to a removal rate for material of the second layer; polishing the substrate for a time period that substantially corresponds to the estimated polish time; and updating said selectivity on the basis of an intermediate selectivity value calculated on the basis of a first substrate and a second substrate processed in a substantially identical process sequence by applying a filter criterion to said intermediate selectivity value to obtain an undated selectivity.