Patent ID: 9564505
Date: 2017-02-07
CPC Classifications: H01L

Claim:
1. A structure comprising: a first-type field effect transistor (FET) including a gate having a high dielectric constant (high-k) layer and a single metal layer over a first type FET region and the high-k layer, the single metal layer having a first effective work function; and a second-type FET including the high-k layer and the single metal layer over a second type FET region and the high-k layer, the high-k layer further including an implanted aluminum (Al) species, the single metal layer further including the implanted aluminum (Al) species that changes the first effective work function to a different second effective work function resulting in a greater than 50 millivolt threshold voltage shift for the second type FET region when compared to the first type FET region, wherein the single metal layer is selected from the group consisting of: tungsten (W), tantalum (Ta), aluminum (Al), ruthenium (Ru), platinum (Pt), titanium nitride (TiN), tantalum nitride (TaN), titanium carbide (TiC), tantalum carbide (TaC), tantalum carbide oxynitride (TaCNO), ruthenium oxide (RuO