Patent ID: 6900542

Claim:
A semiconductor device comprising: an insulating film formed over a semiconductor substrate; a trench and a hole formed in the insulating film; a first underlying layer formed in at least one of the trench and the hole and made of conductive material to prevent diffusion of copper; a main conductive layer formed in at least one of the trench and the hole on the first underlying layer and made of copper or copper alloy; and a second underlying layer formed between the main conductive layer and the first underlying layer and having a metal element that is solid-solved in the main conductive layer at an interface between the second underlying layer and the main conductive layer, and formed on the first underlying layer by a CVD method, wherein a thickness of the second underlying layer is less than 5 nm, and the second underlying layer is solid-solved between 0.01 wt % and 10.1 wt % with respect to the main conductive layer, wherein the second underlying layer is configured to adhere the first underlying layer to the main conductive layer.