Patent ID: 7025891
Filing Date: 2006-04-11
Classification: C23F,H01L

Abstract:
1. A method of treating a molybdenum (moly) mask used in a C4 process to pattern C4 contacts, comprising: providing a moly mask used in the C4 process, the moly mask having a wafer side which contacts a wafer during the C4 process and which has a rough surface that includes projections of moly, a non wafer side, and a plurality of holes extending through the moly mask to pattern C4 contacts in the C4 process; applying an adhesive layer to the non wafer side of the moly mask; subjecting the non wafer side of the moly mask/adhesive layer to a vacuum; polishing the wafer side of the moly mask with a polishing compound to substantially remove the projections of moly without significantly altering the dimensions of the moly mask or the holes.