Patent ID: 8921198
Filing Date: 2014-12-30
Classification: H01L

Abstract:
1. A method of forming a deep trench capacitor comprising: providing a first wafer, the first wafer having a front side and a back side and including a substrate; forming devices on the front side of the first wafer; forming a through-silicon-via within the substrate from the front side of the first wafer; thinning the substrate from the back side of the first wafer to expose the through silicon-via; depositing a pad layer on the substrate from the back side of the first wafer; forming a plurality of deep trenches within the substrate from the back side of the first wafer; forming a buried plate within the substrate from the back side of the first wafer, wherein the buried plate contacts the through-silicon-via and comprises dopants; performing an anneal to activate the dopants; depositing a node dielectric layer in the plurality of deep trenches; filling the plurality of deep trenches with a conductive material; and depositing a conductive layer over the pad layer and the conductive material from the back side of the first wafer.