Patent ID: 8735236

Claim:
A method, comprising: conformally forming a layer of a metal-containing electrode material with a first thickness in a gate opening of a first gate electrode structure of a first transistor and a gate opening of a second gate electrode structure of a second transistor; forming a sacrificial material selectively at a bottom of said gate opening of said second gate electrode structure, said sacrificial material having a second thickness that is less than three times said first thickness; removing a portion of said layer of a metal-containing electrode material from said gate opening of said first gate electrode structure while using said sacrificial material as an etch mask so as to preserve said layer of a metal-containing electrode material with said first thickness at said bottom of said gate opening of said second gate electrode structure; removing said sacrificial material from said gate opening of said second gate electrode structure; and forming a conductive fill material in said gate openings of said first and second gate electrode structures.