Patent ID: 7371686
Filing Date: 2008-05-13
Classification: B24B

Abstract:
1. A method for polishing a semiconductor wafer comprising: placing the semiconductor wafer on a first surface of a retainer, the semiconductor wafer having a second surface which is opposite to said retainer and which is to be polished by a polishing pad; measuring an initial thickness of the semiconductor wafer to obtain a measured initial thickness value; causing said polishing pad to relatively move at a predetermined first moving speed from a predetermined first position to a second position, said second position being set between said first position and said second surface, and being spaced from said first surface by a first sum of said measured initial thickness value of the semiconductor wafer and a predetermined first correction value; and causing said polishing pad to relatively move at a second moving speed from which is lower than said first moving speed from said second position to a third position while conducting an initial polishing process to polish said semicondictor wafer using said polishing pad, said third position being set between said second position and said first surface, and being spaced from said first surface by a first remainder obtained by subtracting a predetermined second correction value from said measured initial thickness value.