Patent ID: 8722503

Claim:
A method for forming a semiconductor device including a capacitor, comprising: forming a trench pattern mask over a top of a semiconductor substrate including a doped region of given conductivity type; etching the substrate through the trench pattern mask to form trenches in an area in the top of the substrate in the doped region; forming a dielectric layer conformally over the top of the substrate including following the contour within the trenches; forming a polysilicon layer over the dielectric layer to overfill the trenches; forming a top metal layer over the polysilicon layer; forming a top plate pattern mask over the top metal layer; and etching the polysilicon and top metal layers through the top plate pattern mask to define a capacitor top plate, a capacitor bottom plate being defined by the trenched doped region of the semiconductor substrate; wherein the doped region of given conductivity type comprises an upper region of the given conductivity type; and wherein the substrate further includes central and lower regions of the given conductivity type; the central region being located between the upper and lower regions, and having a doping concentration that is less than doping concentrations of the upper and lower regions.