Patent ID: 6955962

Claim:
A method of fabricating a capacitor in a semiconductor substrate, comprising: forming a trench having side walls and a bottom surface in the semiconductor substrate; forming a first layer within the trench; removing the first layer from the bottom surface of the trench; forming a first conductive layer on the trench; recessing the first conductive layer within the trench; removing the first layer from the side walls of the trench, forming a structure protruding from the bottom surface of the trench; depositing a doped insulating layer on the trench; driving out charged elements from the doped insulating layer into the semiconductor substrate, forming a doped substrate region; removing the doped insulating layer from the trench forming a first electrode; forming a dielectric layer within the trench; forming a second conductive layer on the trench, and recessing the second conductive layer within the trench forming a second electrode.