Patent ID: 9224613
Filing Date: 2015-12-29
Classification: B24B,H01L,Y10T

Abstract:
1. A sequential method for polishing both sides of a bare semiconductor wafer having a frontside and backside, comprising the following steps in the order specified: a) single side polishing the backside of the semiconductor wafer on a polishing pad which contains an abrasive fixed in the polishing pad, a polishing agent solution which is free of solids being introduced between the backside of the semiconductor wafer and the polishing pad during the polishing step; b) single side stock polishing the frontside of the semiconductor wafer on a polishing pad which contains an abrasive fixed in the polishing pad, a polishing agent solution which is free of solids being introduced between the frontside of the semiconductor wafer and the polishing pad during the polishing step; c) removing microroughness and microdamage from the frontside of the semiconductor wafer by single side polishing the frontside of the semiconductor wafer on a polishing pad, a polishing agent suspension which contains abrasives being introduced between the frontside of the semiconductor wafer and the polishing pad during the polishing step; d) finish polishing the frontside of the semiconductor wafer by single side polishing the frontside of the semiconductor wafer on a polishing pad which contains no abrasive fixed in the polishing pad, a polishing agent suspension which contains abrasives being introduced between the frontside of the semiconductor wafer and the polishing pad during the polishing step, further comprising carrying out a further polishing step between steps b) and c) on a polishing pad which contains an abrasive fixed in the polishing pad, and a polishing agent suspension which contains abrasives is introduced between the frontside of the semiconductor wafer and the polishing pad during the polishing step.