Patent ID: 8344461

Claim:
A MOS solid-state imaging device comprising: a semiconductor substrate provided with a pair of source and drain regions in a pixel area thereof, the pair of source and drain regions constituting part of a transistor in the pixel area; an insulating film formed over the semiconductor substrate; a wiring layer formed over the insulating film; and a contact plug penetrating through the insulating film to connect either one of the pair of source and drain regions with the wiring layer, wherein a surface area of said one of the pair of source and drain regions is silicided, the surface area contacting with the contact plug, and a width of the surface area is equal to a width of the contact plug, and wherein the semiconductor substrate is further provided with another pair of source and drain regions in a peripheral circuit area around the pixel area, the other pair of source and drain regions constituting part of another transistor in the peripheral circuit area, the MOS solid-state imaging device further comprises another contact plug penetrating through the insulating film to connect either one of the other pair of source and drain regions with the wiring layer, a surface area of said one of the other pair of source and drain regions is silicided, the surface area contacting with the other contact plug, and a thickness of the surface area contacting with the contact plug is less than a thickness of the surface area contacting with the other contact plug.