Patent ID: 8686538
Filing Date: 2014-04-01
Classification: H01L

Abstract:
1. A semiconductor device, comprising: a plurality of first inter-layer insulating films formed over a semiconductor substrate; a plurality of first wiring grooves formed in the first inter-layer insulating films respectively; a plurality of first wirings buried in the first wiring grooves respectively, wherein the first wirings are formed of copper as a main component; a plurality of first barrier insulating films formed over the semiconductor substrate, wherein each of the first barrier insulating films is formed on each of the first wirings and each of the inter-layer insulating films, and the first barrier insulating films have a function for preventing the diffusion of copper; a second inter-layer insulating film formed over the first inter-layer insulating films; a fuse buried in a second wiring groove formed in the second inter-layer insulating film, wherein the fuse is formed of copper as a main component; a second wiring buried in a third wiring groove formed in the second inter-layer insulating film, wherein the second wiring is formed of copper as a main component; a second barrier insulating film formed directly on the fuse, the second wiring and the second inter-layer insulating film, wherein the second barrier insulating film has a function for preventing the diffusion of copper; and a third inter-layer insulating film formed over the second barrier insulating film, wherein the first wirings include wirings formed in all layers below the second wiring, wherein a thickness of the second barrier insulating film is larger than a thickness of each the first barrier insulating films, and wherein an opening reaching the second barrier insulating film is formed in the third inter-layer insulating film above the fuse.