Patent ID: 8987080
Filing Date: 2015-03-24
Classification: H01L

Abstract:
1. A method of manufacturing a metal gate electrode, the method comprising: forming a high-k dielectric material on a semiconductor substrate; depositing a high-k dielectric cap layer over the high-k dielectric material, wherein the high-k dielectric cap layer is a barrier to aluminum; depositing a PMOS work function layer having a positive work function value, wherein the PMOS work function layer is a barrier to the fill layer; depositing an NMOS work function layer; depositing an NMOS work function cap layer over the NMOS work function layer, wherein the NMOS cap layer is a barrier to the fill layer; removing at least a portion of the PMOS work function layer or at least a portion of the NMOS work function layer; and depositing a fill layer.