Patent ID: 9748250
Date: 2017-08-29
CPC Classifications: H01L

Claim:
1. A method of forming a semiconductor structure, comprising: forming an upper portion cavity in a semiconductor-on-insulator structure comprising a semiconductor-on-insulator (SOI) layer, a buried insulator layer, and a bulk semiconductor substrate, wherein the upper portion cavity terminates at a top surface of the bulk semiconductor substrate; forming a conformal insulator layer in the upper portion cavity; extending the upper portion cavity into the bulk semiconductor substrate to form an extended cavity after the step of forming the conformal insulator layer; forming a capacitor stack in the extended cavity; removing the conformal insulator layer from a portion of an inner sidewall of the buried insulator layer such that the conformal insulator layer extends from a bottom level of the buried insulator to a point between the bottom level of the buried insulator and a top level of the buried insulator; and filling the extended cavity with a conducting material such that the conductive material contacts the portion of the inner sidewall of the buried insulator layer, and wherein the conducting material is disposed on a side surface and a top surface of the conformal insulator.