Marketing and Privacy Concerns

An improved method is provided for defining interconnect patterns in an integrated circuit fabricated on a semiconductor wafer. The improvement comprises the step of immersing the wafer in a weak base solution, prior to etching a titanium-tungsten barrier layer, so as to remove from the wafer chlorides and flourides remaining as a result of a previous step of etching a conductor layer. In a preferred embodiment of the invention, a step of immersing the wafer in a strong acid solution is also performed to remove chlorides from the wafer.

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