Patent ID: 8836031

Claim:
A semiconductor structure comprising: a semiconductor material portion located within a top semiconductor layer in a semiconductor-on-insulator (SOI) substrate; a dielectric material liner laterally contacting a sidewall of said semiconductor material portion and a sidewall of at least an upper portion of a buried insulator layer within said SOI substrate; at least one dielectric fill portion filling a volume inside said dielectric material liner and comprising a first dielectric material; a contact-level dielectric layer in contact with said at least one dielectric fill portion and comprising a second dielectric material that is different from said first dielectric material; and a contact via structure in contact with a component of a device on said top semiconductor layer, said dielectric material liner, said at least one dielectric fill portion, and said contact-level dielectric layer, wherein an interface between said contact via structure and said at least one dielectric fill portion is coplanar with an interface between said at least one dielectric fill portion and said contact-level dielectric layer.