Patent ID: 8278218

Claim:
A method for forming a electrical conductor line of a semiconductor device, comprising the steps of: forming a metal line forming region in an insulation layer on a semiconductor substrate; forming a multi-layered diffusion barrier on the metal line forming region of the insulation layer, the diffusion barrier comprising a TaN layer, an Mo x O y layer and a second Mo layer, wherein the step of forming the diffusion barrier comprises the steps of: forming the TaN layer on the metal line forming region of the insulation layer; depositing a first Mo layer on the TaN layer; forming an Mo x O y layer by oxidating the first Mo layer; and depositing the second Mo layer on the Mo x O y layer wherein the diffusion barrier is multi-layered having the TaN layer, the Mo x O y layer and the second Mo layer; and forming a metal line on the diffusion barrier to substantially fill in the metal line forming region.