Patent ID: 7550807

Claim:
A semiconductor memory in which a source diffusion layer and a drain diffusion layer are formed on a semiconductor substrate, wherein: the source diffusion layer has a protrusion portion and a depressed portion on a cross section taken along a plane that includes (a) a straight line extending along a direction of extension of the source diffusion layer and (b) a normal line of the semiconductor substrate, and the source diffusion layer is formed of a series of (a) an upper-wall layer constituting the protrusion portion, (b) a lower-wall layer constituting the depressed portion, and (c) a side-wall layer between the upper-wall layer and the lower-wall layer; a silicide is formed to cover the upper-wall layer, the lower-wall layer, and the side-wall layer; and a distance between (a) an interface between the upper-wall layer and the silicide and (b) an interface between the lower-wall layer and the silicide is 1000 Å or shorter.