Patent ID: 7235433
Filing Date: 2007-06-26
Classification: H01L

Abstract:
1. A method of forming a semiconductor device comprising: providing a silicon-on-insulator structure comprising a substrate with a silicon layer overlying said substrate and a first insulating layer interposed therebetween; forming an opening in a first region of said silicon-on-insulator structure by removing a portion of said silicon layer and said first insulating layer to expose a portion of said substrate layer; selectively growing epitaxial silicon in said opening; forming a second insulating layer in said silicon grown in the opening in the first region to provide an insulating layer between the grown silicon in the opening and the substrate, wherein the second insulating layer has a thickness in said first region less than a thickness of the first insulating layer in a second region of the structure; and forming a partially depleted MOSFET in the first region and a fully depleted MOSFET in the second region.