Patent ID: 7282440
Filing Date: 2007-10-16
Classification: H01L,Y10S

Abstract:
1. A processing method for a support material for a semiconductor device having a layer of insulation on at least a portion thereof, comprising: providing a plurality of serially deposited etch masks made of a plurality of etch mask materials, a first etch mask acting as an etch stop layer located over said insulating layer; etching openings into said support material for a semiconductor device, said etching is determined by said plurality of etch masks, said plurality of etch masks forming a first opening having a first length and a first width, and having a second opening connected to said first opening while being located therebelow formed by a second etch mask having a width wider than the first etch mask used to form the first opening, said second opening having a second length less than said first length of said first opening and having a second width equal to said first width of said first opening, said first etch mask acting as an etch stop layer defining a third width of a third opening located above said first opening and connected to said first opening, said third opening having a third length equal to said first length of said first opening and said third width equal to said second width of said second opening; and filling at least a portion of the first opening with one of tungsten, copper and silver.