Patent ID: 9368418
Filing Date: 2016-06-14
CPC Classification: C23C,H01J,H01L

Claim Text:
1. A Cu wiring structure forming method, comprising: providing a first insulating film having a recess on a substrate; forming a barrier film serving as a Cu diffusion barrier at least on a surface of the recess of the first insulating film on a substrate; filling the recess with an Al-containing Cu film; forming an additional layer on the Al-containing Cu film; forming a Cu wiring by planarization, in which the additional layer, the Al-containing Cu film and the barrier film outside the recess are removed; forming a cap layer including a Ru film on the Cu wiring; forming an interface layer containing a Ru—Al alloy at an interface between the Cu wiring and the cap layer by heat generated in forming the cap layer or by a heat treatment performed after forming the cap layer; and forming a second insulating film on the cap layer.