Patent ID: 9490255
Filing Date: 2016-11-08
CPC Classification: H01L

Claim Text:
1. An electrical device comprising: a semiconductor substrate having an n-type region, a p-type region and a mid gap region; a p-type semiconductor device present in the p-type region having a p-type work function gate structure comprised of a first high-k gate dielectric, a first metal containing buffer layer present on the first high-k gate dielectric, and a first titanium nitride layer having a first thickness present on the first metal containing buffer layer; a mid gap semiconductor device present in the mid gap region of the semiconductor substrate having a mid gap gate structure comprised of a second high-k gate dielectric, a second metal containing buffer layer present on the second high-k gate dielectric, and a second titanium nitride layer having a second thickness that is less than the first thickness present on the second metal containing buffer layer; wherein the mid gap semiconductor device has a gate work function ranging from 4.5 eV to 4.6 eV, and an n-type semiconductor device present in the n-type region having an n-type work function gate structure comprised of a third high-k gate dielectric present on a channel region of the n-type semiconductor device, a third metal containing buffer layer on the third high-k gate dielectric and a n-type gate conductor contact present atop the third metal containing buffer layer.