Patent ID: 8841191

Claim:
A semiconductor device comprising: a substrate; a gate insulator disposed on the substrate; a gate electrode disposed on the gate insulator; a source diffusion layer of a first conductivity type and a drain diffusion layer of a second conductivity type which are disposed on a surface of the substrate so as to sandwich the gate electrode, the second conductivity type being an opposite conductivity type to the first conductivity type; and a junction forming region disposed between the source diffusion layer and the drain diffusion layer so as to contact the source diffusion layer, and having a surface facing the gate insulator, wherein the junction forming region comprises: a source extension layer of the first conductivity type; a pocket layer of the second conductivity type disposed above the source extension layer; and a carbon containing layer disposed between the source extension layer and the pocket layer, a carbon concentration on the surface of the junction forming region being lower than a carbon concentration in the carbon containing layer.