Patent ID: 7677957
Filing Date: 2010-03-16
Classification: B24B,H01L

Abstract:
1. A polishing apparatus comprising at least: a polishing head; a polishing apparatus turntable on which a circular semiconductor substrate of a defined radius is mounted; and a circular polishing pad for polishing the circular semiconductor substrate, the circular polishing pad having a surface containing a plurality of V-shaped or U-shaped grooves and a center, the circular polishing pad being mounted on the polishing head so that the mounted circular semiconductor substrate is disposed outward from the center of the circular polishing pad, wherein the V-shaped or U-shaped grooves have a radial pattern emanating from a central part of the circular polishing pad, and the V-shaped or U-shaped grooves are formed so that a groove depth of portions of the V-shaped or U-shaped grooves located nearer to the center of the circular polishing pad than the circular substrate is shallower than a groove depth of portions of the V-shaped or U-shaped grooves existing immediately below the circular substrate, and an intersection point where the V-shaped or U-shaped grooves overlap each other at the central part of the circular polishing pad does not exist immediately below the circular substrate, the V-shaped or U-shaped grooves have a constant groove width at the surface and are formed so that angles between adjacent grooves are more than values obtained by mathematical formula 1 as follows: an average value of the total volumes of all V-shaped or U-shaped grooves in the portion of the circular polishing pad surface immediately below the circular substrate is 0.06 to 0.23 when represented by the average value of the total groove volumes in the circular polishing pad portion (mm