Ditthavong & Steiner, P.C.
SAV using selective SAQP/SADP
Methods of forming a SAV using a selective SAQP or SADP process are provided. Embodiments include providing on a TiN layer and dielectric layers alternating mandrels and non-mandrel fillers, spacers therebetween, and a metal cut plug through a mandrel or a non-mandrel filler; removing a non-mandrel filler through a SAV patterning stack having an opening over the non-mandrel filler and adjacent spacers, forming a trench; removing a mandrel through a second SAV patterning stack having an opening over the mandrel and adjacent spacers, forming a second trench; etching the trenches through the TiN and dielectric layers; forming plugs in the trenches; removing the mandrels and non-mandrel fillers, forming third trenches; etching the third trenches through the TiN layer; removing the metal cut plug and spacers and etching the third trenches into the dielectric layer; removing the plugs; and filling the trenches with metal.
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