Patent ID: 8994123
Filing Date: 2015-03-31
Classification: H01L

Abstract:
1. A metal-oxide-semiconductor field effect transistor (MOSFET) comprising: a well formed over a substrate; a drain region; a source region separate from the drain region, the source and drain regions being formed in the top of the well; a recess formed in the well and extending through an edge of each of the source and drain regions; the recess having a bottom surface that is deeper than the depth of the source and drain regions; an active channel formed of an undoped channel epitaxial layer formed from the bottom surface of the recess and touching the source and drain regions, the undoped channel epitaxial layer having a thickness that reduces statistical variations of threshold voltage (σV a high-K dielectric stack formed on the undoped channel epitaxial layer; and a metal gate layer formed on the high-K dielectric stack.