Patent ID: 8420528
Filing Date: 2013-04-16
Classification: H01L

Abstract:
1. A manufacturing method of a semiconductor device comprising the steps of: (a) forming a plurality of wiring trenches in a first insulating film on a semiconductor substrate; (b) forming a first conductive film on the first insulating film, including on respective insides of the wiring trenches; (c) forming wirings formed of the first conductive film inside respective wiring trenches by removing a portion of the first conductive film outside the wiring trenches by CMP, each of the wirings formed of the first conductive film including a main conductive film made of copper; (d) forming a first barrier insulating film on the first insulating film and the wirings; (e) forming at least one reservoir position by removing the first barrier insulating film and the first insulating film except portions of the first barrier insulating film and the first insulating film in lower regions and associated peripheral regions of through holes, which are formed later and from which upper surfaces of corresponding wirings are exposed, the removal of the first insulating film being to an extent deeper than bottoms of the wirings; (f) forming second barrier insulating film portions on the first barrier insulating film and respective side and upper surfaces of the wirings such that the second barrier insulating film in spaces between the wirings is made thinner than the second barrier insulating film on upper surfaces of the wirings, and such that the second barrier insulating film is not formed between the wirings at bottoms of regions where the first insulating film has been removed to an extent deeper than the bottoms of the wirings; (g) forming a second insulating film on the second barrier insulating film portions, while leaving gaps in predetermined space regions between wirings from which the first barrier insulating film and the first insulating film have been removed; (h) forming the through holes penetrating through the first barrier insulating film, the second barrier insulating film, and the second insulating film to the upper surfaces of the corresponding wirings; and (i) forming a second conductive film inside the through holes.