Metal gate scheme for device and methods of forming
First Claim
1. A method comprising:
- forming a first source/drain region and a second source/drain region in a substrate; and
forming a gate structure between the first source/drain region and the second source/drain region and over the substrate, wherein forming the gate structure comprising;
depositing a gate dielectric layer over the substrate,depositing a work function tuning layer over the gate dielectric layer,depositing a first metal over the work function tuning layer,forming an adhesion layer over the first metal, wherein forming the adhesion layer comprises oxidizing the first metal, anddepositing a second metal over the adhesion layer, the second metal being different from the first metal.
1 Assignment
0 Petitions
Accused Products
Abstract
Gate structures and methods of forming the gate structures are described. In some embodiments, a method includes forming source/drain regions in a substrate, and forming a gate structure between the source/drain regions. The gate structure includes a gate dielectric layer over the substrate, a work function tuning layer over the gate dielectric layer, a first metal over the work function tuning layer, an adhesion layer over the first metal, and a second metal over the adhesion layer. In some embodiments, the adhesion layer can include an alloy of the first and second metals, and may be formed by annealing the first and second metals. In other embodiments, the adhesion layer can include an oxide of at least one of the first and/or second metal, and may be formed at least in part by exposing the first metal to an oxygen-containing plasma or to a natural environment.
13 Citations
20 Claims
-
1. A method comprising:
-
forming a first source/drain region and a second source/drain region in a substrate; and forming a gate structure between the first source/drain region and the second source/drain region and over the substrate, wherein forming the gate structure comprising; depositing a gate dielectric layer over the substrate, depositing a work function tuning layer over the gate dielectric layer, depositing a first metal over the work function tuning layer, forming an adhesion layer over the first metal, wherein forming the adhesion layer comprises oxidizing the first metal, and depositing a second metal over the adhesion layer, the second metal being different from the first metal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A method comprising:
-
forming a first source/drain region and a second source/drain region in a substrate; forming an inter-layer dielectric over the substrate, an opening being through the inter-layer dielectric to the substrate, the opening being between the first source/drain region and the second source/drain region; forming a gate dielectric layer in the opening and over the substrate; forming a work function tuning layer in the opening and over the gate dielectric layer; forming a first metal in the opening and over the work function tuning layer; forming a second metal in the opening and over the first metal, the second metal being different from the first metal; and forming an adhesion layer between the first metal and the second metal, wherein forming the adhesion layer comprises annealing the first metal and the second metal to react to form an alloy of the first metal and the second metal. - View Dependent Claims (12, 13, 14, 15, 16)
-
-
17. A method comprising:
-
forming a first source/drain region and a second source/drain region in a substrate; forming an inter-layer dielectric over the substrate, a first opening being through the inter-layer dielectric to the substrate, the first opening being between the first source/drain region and the second source/drain region; forming a gate dielectric layer in the first opening and over the substrate; forming a first work function tuning layer in the first opening and over the gate dielectric layer; forming a first metal in the first opening and over the first work function tuning layer; forming a second metal in the first opening and over the first metal, the second metal being different from the first metal; and forming an adhesion layer between the first metal and the second metal, wherein the adhesion layer comprises at least the first metal, and wherein the adhesion layer comprises; an oxide of the first metal and the second metal; an oxide of the second metal over an oxide of the first metal;
oran alloy of the first metal and the second metal. - View Dependent Claims (18, 19, 20)
-
Specification