Patent ID: 7888723
Filing Date: 2011-02-15
Classification: H01L

Abstract:
1. A deep trench capacitor comprising: a node dielectric located on a sidewall of a deep trench located in a semiconductor-on insulator (SOI) substrate and contacting a sidewall of a buried insulator layer of said SOI substrate; an inner electrode abutting an inner wall of said node dielectric; a buried plate comprising a doped semiconductor material and abutting a bottom surface of said buried insulator layer and an outer wall of said node dielectric, wherein said node dielectric has a same thickness on said sidewall of said buried insulator layer as on said buried plate; and a buried strap abutting said inner electrode and a top semiconductor layer of the said SOI substrate, said buried strap having an upper buried strap sidewall that overlies a topmost surface of said buried insulator layer and is laterally offset from a lower buried strap sidewall and said outer wall of said node dielectric by a lateral offset.