Patent ID: 7560356

Claim:
A method of fabricating a trench capacitor, comprising: performing a patterning process to a substrate by using a patterned mask layer over the substrate to form a plurality of trenches; forming a bottom electrode in the substrate of surfaces of the trenches; removing a portion of the patterned mask layer to expose a portion of the substrate at two sides of a top of each of the trenches, wherein a remaining portion of the patterned mask layer remains on the substrate; forming a capacitor dielectric layer over the substrate and the surfaces of the trenches; forming a conductive layer over the substrate, the conductive layer at least filling the trenches and covering the capacitor dielectric layer; and removing the remaining portion of the patterned mask layer and a portion of the conductive layer; and maintaining a portion of the conductive layer, which covers the capacitor dielectric layer to form a top electrode.