Patent ID: 8809994

Claim:
A semiconductor structure comprising: a semiconductor-on-insulator (SOI) substrate comprising a first trench and a second trench extending through a buried insulator layer of said SOI substrate and laterally spaced from each other; a node dielectric contacting a sidewall of said second trench; a bottom semiconductor oxide portion located in said first trench and underneath a bottom surface of said buried insulator layer and comprising an oxide of a semiconductor material of at least one semiconductor layer located underneath said buried insulator layer, said node dielectric including a dielectric material having a different composition than said oxide of said semiconductor material and contacting said at least one semiconductor layer; a top semiconductor oxide portion located in said first trench and above a top surface of said buried insulator layer and comprising an oxide of a semiconductor material of a top semiconductor layer located above said buried insulator layer; a first conductive material portion located in said first trench; a second conductive material portion embedded within said node dielectric and comprising a same material as said first conductive material portion, wherein said second conductive material portion, said node dielectric, and a portion of said at least one semiconductor layer collectively constitute a trench capacitor; and a first shallow trench isolation structure located within said first trench and comprising a dielectric material and located above said first conductive material portion, wherein a lower portion of said first shallow trench isolation structure located below a horizontal plane including a top surface of said buried insulator layer laterally protrudes outward relative vertical sidewalls of an upper portion of said first shallow trench isolation structure located above said horizontal plane.