Patent ID: 8598580

Claim:
A wiring structure, comprising a semiconductor layer and a Cu alloy layer on a substrate in that order from the substrate side, wherein: a multilayer structure comprising an (N, C, F, O) layer comprising at least one element selected from the group consisting of nitrogen, carbon, fluorine, and oxygen and a Cu—Si diffusion layer comprising Cu and Si disposed in that order from the substrate side is interposed between the semiconductor layer and the Cu alloy layer, such that at least one element of the (N, C, F, O) layer is bonded to Si in the semiconductor layer; and the Cu alloy layer comprises a multilayer structure comprising, in the following order from the substrate side, a first layer comprising a Cu—X alloy layer comprising at least one alloy component X selected from the group consisting of Zn, Ni, Ti, Al, Mg, Ca, W, Nb, and Mn and a second layer comprising pure Cu or a Cu alloy mainly comprising Cu and having an electrical resistivity lower than that of the first layer.