Patent ID: 7868389

Claim:
An electronic device comprising: a substrate including a first portion and a second portion; a gate dielectric layer overlying the first portion and the second portion of the substrate; a first gate electrode overlying the gate dielectric layer and the first portion of the substrate, wherein: the first gate electrode includes a first portion of a first layer, a first portion of a second layer, and a first portion of a third layer, wherein the second layer lies between the first layer and the third layer; the first portion of the first layer lies immediately adjacent to the gate dielectric layer; and the first layer comprises a first element that is a metallic element and an impurity that includes a second element within Group 2 or 13 of the Periodic Table; a first source/drain region overlying the first portion of the substrate, wherein a first transistor includes the first source/drain and the first gate electrode; a second gate electrode overlying the gate dielectric layer and the second portion of the substrate, wherein: the second gate electrode includes a second portion of the second layer and a second portion of the third layer; and the second portion of the second layer lies immediately adjacent to the gate dielectric layer; and a second source/drain region overlying the second portion of the substrate, wherein a second transistor includes the second source/drain and the second gate electrode.