Patent ID: 7847410

Claim:
An interconnect of a group III-V semiconductor device, suitable for connecting the group III-V semiconductor device, wherein the group III-V semiconductor device comprises at least a substrate, a dielectric layer, a metal layer, a source, and a drain, the interconnect comprising: a first adhesion layer disposed directly on the metal layer, or on the source region and the drain region of a part of the group III-V semiconductor device wherein the metal layer, and the source region and the drain region are configured above the substrate; a diffusion barrier layer disposed on the first adhesion layer; a second adhesion layer disposed on the diffusion barrier layer; and a copper wire line disposed on the second adhesion layer, wherein the copper wire line comprises a copper bridge having a U-shaped structure and two arms of the U-shaped structure are disposed on the second adhesion layer wherein the first adhesion layer and the second adhesion layer are constituted with a material that includes titanium tungsten alloy or chromium, and the diffusion barrier layer is constituted with palladium (Pd), wherein a thickness of the first adhesion layer and the second adhesion layer is about 200 Å to 5000 Å, and a thickness of the diffusion barrier layer is about 1500 Å to 8000 Å.