Patent ID: 6093658
Filing Date: 2000-07-25
Classification: H01L

Abstract:
A method for making reliable interconnect structures on a semiconductor wafer having a first dielectric layer, comprising:plasma patterning a first metallization layer over the first dielectric layer;forming a second dielectric layer over the first metallization layer and the first dielectric layer;forming a plurality of tungsten plugs in the second dielectric layer, such that each of the plurality of tungsten plugs are in electrical contact with the first metallization layer;plasma patterning a second metallization layer over the second dielectric layer and the plurality of tungsten plugs, such that at least a gap over at least one of the tungsten plugs is not covered by the second metallization layer and a positive charge is built-up on at least part of the second metallization layer;exposing the semiconductor wafer to an electron dose that is configured to neutralize the positive charge that is built-up on the at least part of the second metallization layer; andsubmersing the semiconductor wafer in a basic solution to remove polymer residues caused by the plasma patterning, and the neutralizing of the positive charge is configured to prevent the at least one of the tungsten plugs not covered by the second metallization layer from eroding during the submersing.