Patent ID: 7429754

Claim:
A semiconductor device comprising: a substrate; a composite bonding layer formed above said substrate; a first electrode formed above said composite bonding layer; a semiconductor layer formed in an area including a surface of said first electrode; and a second electrode formed in a partial surface area of said semiconductor layer, wherein: said composite bonding layer is formed when a support substrate including said substrate and a first bonding layer is bonded to a semiconductor lamination structure including said semiconductor layer, said first electrode and a second bonding layer; said first or second bonding layer contains eutectic material contents; at least one of said support substrate and said semiconductor lamination structure includes a diffusion material layer containing diffusion material; and said composite bonding layer is formed in such a manner that eutectic material contents contained in one of said first and second bonding layers are mixed with the other to form a first mixture body, and that said first mixture body is mixed with diffusion material contained in said diffusion material layer to form a second mixture body having a melting point higher than a melting point of said first mixture body.