Patent ID: 8193641
Filing Date: 2012-06-05
Classification: H01L

Abstract:
1. An apparatus comprising: a substrate; a pair of spacers disposed on a surface of the substrate defining a trench between them; a high-k gate dielectric layer conformally deposited on the bottom and sidewalls of the trench, wherein the top of the high-k gate dielectric layer is substantially the same height as the top of the sidewalls and wherein the high-k gate dielectric layer comprises a bottom portion and two sidewall portions; a recessed work function metal layer conformally deposited on the bottom and two sidewall portions of the high-k gate dielectric layer, wherein the top of the recessed work function metal layer is substantially lower than the top of the sidewalls; a second work function metal layer conformally deposited on the recessed work function metal layer, wherein portions of the second work function metal layer are in direct contact with both sidewall portions of the high-k gate dielectric layer; and an electrode metal layer deposited on the second work function metal layer.