Patent ID: 8138537

Claim:
A semiconductor device having: inter-device separation parts formed in a semiconductor substrate and partitioning an active region of the semiconductor substrate, and a capacitive element formed over the semiconductor substrate, the capacitive element comprising: a well formed in the active region and configuring a first electrode of the capacitive element; a first capacitive insulating film formed over the well; a second electrode formed over the first capacitive insulating film; a second capacitive insulating film formed over the second electrode; and a third electrode formed over the second capacitive insulating film, wherein a plurality of grooves, each having a first width in a first direction, are formed in the second electrode, wherein a portion of the second capacitive insulating film, and a portion of the third electrode are embedded in the interior of each of the grooves, and wherein each of the grooves has a depth greater than an interval between the grooves in the first direction.