Patent ID: 7241685

Claim:
A method of making a semiconductor device, comprising: forming a first insulating layer on a semiconductor substrate; forming an adjacent conductor film overlying said first insulating layer; forming a laminate wiring line overlying said adjacent conductor film, wherein said forming said laminate wiring line includes: forming a first main wiring layer, of the laminate wiring line, overlying said adjacent conductor film, whereby said adjacent conductor film is between said first insulating layer and said first main wiring layer, and forming a second main wiring layer, of the laminate wiring line, laminated on said first main wiring layer, each of the first and second main wiring layers including a main constituent material and at least said second main wiring layer including an added material, said main constituent material of each of said first main wiring layer and said second main wiring layer being the same material, wherein each of the first and second main wiring layers includes aluminum as the main constituent material and at least said second main wiring layer including copper as the added material, wherein said adjacent conductor film is for preventing diffusion of the main constituent material, and wherein a concentration of the added material in said first main wiring layer is less than that in said second main wiring layer; forming a second adjacent conductor film overlying the second main wiring layer for preventing diffusion of the main constituent material; after forming the second adjacent conductor film, forming a second insulating film on the second adjacent conductor film; and forming an electrically conductive plug through the second insulating film and electrically connected to said laminate wiring line.