Patent ID: 7928573

Claim:
A metal thin film for use as an interconnection of a semiconductor device, wherein the metal thin film is used in fabricating a damascene interconnection of a semiconductor device by a high pressure annealing process, and the metal thin film comprises a Cu alloy containing consisting of Cu, N at a content of not less than 0.4 at % to not more than 2.0 at %, and optionally at least one element selected from the group consisting of Mg, Al, Si, P, S, Ti, V, Cr, Mn, Fe, Co, Ni, Zn, Ge, Y, Zr, Nb, Mo, Tc, Ru, Rh, Pd, Ag, Cd, In, Sn, Sb, Hf, Ta, W, Re, Os, Ir, Pt, Au, Pb, Bi, and a rare earth metal element (a lanthanoid series element of atomic number 57 to 71) wherein the total amount of said at least one element is 2.0 at % or less.