Patent ID: 9018710
Filing Date: 2015-04-28
Classification: H01L

Abstract:
1. A semiconductor device comprising: a substrate comprising first and second regions; a first gate stack structure formed over the first region, the first gate stack structure comprising: a first gate dielectric layer, a first metal-containing gate electrode formed over the first gate dielectric layer, the first metal-containing gate electrode containing a first effective work function adjust species, and an effective work function promotion layer formed over the first metal-containing gate electrode; a second gate stack structure formed over the second region, the second gate stack structure comprising: a channel region formed under the first gate stack structure and containing a threshold voltage adjust species, wherein the dipole formation layer comprises a nitrogen-rich (N-rich) titanium nitride (TiN) containing nitrogen at a ratio greater than a chemical stoichiometric ratio of titanium to nitrogen, and the N-rich TiN further comprises arsenic.