Patent ID: 8384191

Claim:
A stack capacitor structure, comprising: an insulating substrate with at least one doped insulating material layer disposed therein; a trench is disposed in the insulating substrate, wherein the trench has an inner sidewall with a first region and a second region, the second region has a hole, and the first region has a recess with the doped insulating material layer serving as a bottom for supporting the insulating material layer; a first capacitor disposed in the trench comprising: a first cylindrical storage node; a first capacitor dielectric layer surrounding the first cylindrical storage node; and a first top plate surrounding the first capacitor dielectric layer; and a second capacitor disposed adjacent to the first capacitor, wherein the second capacitor comprises: a second cylindrical storage node; a second capacitor dielectric layer surrounding the second cylindrical storage node; and a second top plate surrounding the second capacitor dielectric layer and coupling to the first top plate of the first capacitor through a connecting node, wherein the connecting node is disposed in the hole.