Patent ID: 9478462
Filing Date: 2016-10-25
CPC Classification: H01L

Claim Text:
1. A method of comprising: providing on a titanium nitride (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 first self-aligned via (SAV) patterning stack having an opening over the non-mandrel filler and adjacent spacers, forming a first 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 first and second trenches through the TiN and dielectric layers; forming first and second plugs in the first and second 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 first and second plugs; and filling the first, second and third trenches with metal.