Patent ID: 8217440

Claim:
A semiconductor device, comprising: a substrate; and a Metal-Oxide-Semiconductor (MOS) transistor comprising: a semiconductor region formed on the substrate; a source region and drain region formed in the semiconductor region, wherein the source region and drain region are separated from each other; a channel region formed in the semiconductor region that separates the source region and the drain region; an interfacial oxide layer (IL) formed on the channel region having at least one element incorporated therein that is disparate from Si, O, or N at a peak concentration greater than 1×10 19 atoms/cm 2 ; and a high-k dielectric layer formed on the interfacial oxide layer having a high-k/IL interface at a depth substantially adjacent to the IL; wherein at least one depth of peak density of the at least one element is located substantially below the high-k/IL interface.