Method of manufacturing a semiconductor device having wiring layers within the substrate

摘要

A transistor element is formed on the surface of a silicon substrate. A tunnel is formed in the silicon substrate at a position right under the transistor element. A contact hole is formed to extend from the surface of the silicon substrate to the contact hole. Silicon oxide films are respectively formed on the inner surfaces of the tunnel and the contact hole. A wiring layer is buried in the tunnel and the contact hole. The wiring layer is connected to a diffusion layer of the transistor element.