Patent ID: 7732845

Claim:
A semiconductor structure comprising: a lightly-doped first conductivity type semiconductor layer containing a lightly-doped first conductivity type region and located in a semiconductor substrate; a second conductivity type charge collection well vertically abutting said lightly-doped first conductivity type region; a transfer transistor including a floating drain located in said semiconductor substrate, a gate dielectric vertically abutting a top surface of said lightly-doped first conductivity type semiconductor layer, and a gate electrode vertically abutting said gate dielectric, wherein said second conductivity type charge collection well is a source of said transfer transistor; and a tensile-stress-generating structure located on said gate electrode, wherein said tensile-stress-generating structure applies a normal tensile stress between said second conductivity type charge collection well and said floating drain in a direction connecting said second conductivity type charge collection well and said floating drain.