Patent ID: 9054020
Filing Date: 2015-06-09
Classification: H01L

Abstract:
1. A method of forming a semiconductor structure, comprising: depositing a nitride layer over a semiconductor-on-insulator layer, wherein the semiconductor-on-insulator layer is disposed on a buried oxide (BOX) layer; depositing a resist layer over the nitride layer; patterning the resist layer to form patterned resist regions; depositing a conformal oxide layer over the patterned resist regions; recessing the conformal oxide layer to expose a top portion of the patterned resist regions; removing the patterned resist regions; forming cavities in the nitride layer and the semiconductor-on-insulator layer, wherein the cavities extend to the BOX layer; removing the conformal oxide layer; forming a blanket oxide layer; recessing the blanket oxide layer below a top surface of the semiconductor-on-insulator layer; growing an epitaxial semiconductor layer on the semiconductor-on-insulator layer, wherein the epitaxial semiconductor layer is contiguous with the semiconductor-on-insulator layer, to form an integral semiconductor layer, wherein a top surface of the integral semiconductor layer is substantially coplanar with a top surface of the nitride layer, and wherein the integral semiconductor layer encloses a remainder of the blanket oxide layer; removing the nitride layer after forming the integral semiconductor layer; and performing an anisotropic reactive ion etch on the integral semiconductor layer to split the integral semiconductor layer into an upper set of fins and a lower set of fins.