Patent ID: 6642153
Filing Date: 2003-11-04
Classification: B08B,H01L

Abstract:
A method for plasma treating a resinous plug containing dual damascene opening with improved removal of polymeric material including residual via fences comprising the steps of:providing a semiconductor wafer comprising a via opening extending through at least one IMD layer in closed communication with an underlying etch stop layer further comprising a resinous via plug formed to fill the via opening to a level about equal to a bottom portion of a subsequently formed overlying trench line opening; etching the trench line opening overlying and encompassing the via opening to form a dual damascene opening comprising an edge portion defining a diameter of a remaining portion of the via opening; and, plasma treating the dual damascene opening with an oxygen containing plasma to substantially remove the resinous via plug including residual polymeric material while simultaneously removing a portion of the edge portion to form a faceted via opening portion having a larger diameter at an upper portion of the via opening.