Patent ID: 8753934
Filing Date: 2014-06-17
Classification: H01L

Abstract:
1. A method for integrating embedded dynamic random access memory with fin field effect transistors, the method comprising: forming a first fin structure and at least a second fin structure on a substrate; forming a deep trench area between the first fin structure and second fin structure, wherein the deep trench area extends through an insulator layer of the substrate and a semiconductor layer of the substrate that is below the insulator layer; forming a high-k metal gate within the deep trench area, wherein the high-k metal gate comprises a high-k dielectric layer and a metal layer; depositing a polysilicon material within the deep trench area adjacent to the metal layer; etching and recessing the high-k metal gate and the polysilicon material to an area below a top surface of the insulator layer; forming a poly strap in the deep trench area on top of the high-k metal gate and the polysilicon material that have been etched and recessed, wherein the poly strap is dimensioned to be below a top surface of the first fin structure and the second fin structure; and electrically coupling the first fin structure and the second fin structure to the poly strap.