Patent ID: 7825516

Claim:
An integrated circuit conductive metal susceptible to electromigration, said metal positioned in a trench in a planar surface of a dielectric, said dielectric being formed of at least one material taken from the group taken from the group of monomeric SiO 2 based compounds selected from SiCOH and SiLK materials, said conductive metal being copper and surrounded in said trench by a lining of a material that inhibits out-diffusion from the electromigration susceptible metal, said lining being an alloy or liner stack comprised of at least one elements from groups A and B, where A is chosen from W, Ta, Ti, their nitrides and silicides; and where B is chosen from Ru, Rh, Pd, Pt, Ag, Co and Ir, said metal and said liner in said trench being covered by a self aligned cap formed from at least one member of the group of Ru, Pd, Rh, Ir, Ag, Pt and Co, and said cap comprising said material forming said liner, said liner per se serving as the source of material for said cap.