Patent ID: 8735971

Claim:
A semiconductor device including two surround gate transistors, the device comprises: a first fin-shaped silicon layer on a substrate; a second fin-shaped silicon layer on the substrate, the first fin-shaped silicon layer and the second fin-shaped silicon layer connected to each other at ends thereof and define a closed loop; a first insulating film around the first fin-shaped silicon layer and the second fin-shaped silicon layer; a first pillar-shaped silicon layer on the first fin-shaped silicon layer and having a width equal to a width of the first fin-shaped silicon layer; a second pillar-shaped silicon layer on the second fin-shaped silicon layer and having a width equal to a width of the second fin-shaped silicon layer; a first diffusion layer in an upper portion of the first fin-shaped silicon layer and a lower portion of the first pillar-shaped silicon layer; a second diffusion layer in an upper portion of the first pillar-shaped silicon layer; a third diffusion layer in an upper portion of the second fin-shaped silicon layer and a lower portion of the second pillar-shaped silicon layer; a fourth diffusion layer in an upper portion of the second pillar-shaped silicon layer; a silicide in upper portions of the first and third diffusion layers in the upper portion of the first and second fin-shaped silicon layers; a first gate insulating film around the first pillar-shaped silicon layer; a first metal gate electrode around the gate insulating film; a second gate insulating film around the second pillar-shaped silicon layer; a second metal gate electrode around the second gate insulating film; a metal gate line connected to the first metal gate electrode and to the second metal gate electrode and extending in a direction perpendicular to a direction of the first fin-shaped silicon layer and the second fin-shaped silicon layer; a first contact on the first and second diffusion layers and directly connected to the first and second diffusion layers; and a second contact on the third diffusion layer and directly connected to the third diffusion layer.