Patent ID: 8008748

Claim:
A semiconductor structure comprising: a deep trench located in a semiconductor substrate and having a bottom surface located at a first depth from a top surface of said semiconductor substrate; a node dielectric abutting sidewalls and said bottom surface of said deep trench; a conductive inner electrode located inside said node dielectric and contacting all inner surfaces of said node dielectric and not contacting any semiconductor material of said semiconductor substrate, wherein said deep trench is completely filled by said node dielectric and said conductive inner electrode, and said node dielectric is not present over said conductive inner electrode; a doped well extending from said top surface of said semiconductor substrate to a second depth, located outside said deep trench, and abutting and laterally enclosing said node dielectric, wherein said second depth is less than said first depth; a semiconductor region having a different dopant concentration or a doping of a different conductivity type than said doped well, located in said semiconductor substrate, and abutting and laterally enclosing an entirety of a lower portion of said deep trench beneath a depth from said top surface of said semiconductor substrate, wherein said depth is less than said first depth; and a contact via vertically abutting a top surface of said conductive inner electrode.