Patent ID: 9385262
Filing Date: 2016-07-05
CPC Classification: H01L

Claim Text:
1. A method of manufacturing a semiconductor device provided with a plurality of wiring layers disposed on a first interlayer insulating film, the method comprising: forming the first interlayer insulating film disposed on a semiconductor substrate; forming a first titanium layer on the first interlayer insulating film; forming, on the first titanium layer, a first metal layer containing a first metal capable of forming an alloy with titanium in the first titanium layer; forming a first orientation layer on the first metal layer; forming a first aluminum layer on the first orientation layer; patterning a laminated layer including the first titanium layer, the first metal layer, the first orientation layer, and the first aluminum layer so as to form a first wiring layer; forming a second interlayer insulating film on the first wiring layer after the patterning the laminated layer; forming an alloy of the titanium in the first titanium layer and the first metal in the first metal layer by heating treatment; and forming a trench in the second interlayer insulating film, wherein the first wiring layer is closest to the semiconductor substrate among the plurality of wiring layers.