Patent ID: 6534407
Filing Date: 2003-03-18
Classification: B24B,H01L

Abstract:
A method for reducing dishing effects on a top surface of a semiconductor wafer during a chemical mechanical polishing (CMP) process, the top surface of the semiconductor wafer comprising a silicate film, the method comprising:starting the chemical mechanical polishing process, at a polishing time=0 second, by using an alkaline slurry containing water, abrasives and soluble inorganic salts; at a polishing time=t1 second, adding a predetermined quantity of one of alcohol or phenol into the alkaline slurry; at a polishing timeâˆ’t2 second, detecting an end point of the CMP process, wherein t2>t1; and terminating the CMP process; wherein the alcohol or phenol added into the slurry create a hydrophobic layer over the silicate film so that the dishing effects of the silicate film during the CMP process are alleviated.