Patent ID: 7344965

Claim:
A method for making dual pre-doped gate stacks comprising: (i) providing at least one pre-doped conductive layer on a gate stack, wherein said gate stack comprises a substrate and at least one gate dielectric provided on said substrate, and (ii) etching said at least one conductive layer by exposing it to an etching composition, wherein said etching composition comprises: at least one carbon containing gas; a halogen-based plasma; and a gas selected from the group consisting of O 2 , N 2 , and mixtures of the same; wherein the carbon containing gas is selected from the group consisting of: (i) gases having the chemical formula C x H y , wherein x is an integer ranging from 1 to 10, and Y is an integer ranging from 2 to 22; and (ii) gases having the chemical formula C x H y A, wherein x is an integer ranging from 1 to 10, Y is an integer ranging from 0 to 21, and A represents at least one additional substitient selected the group consisting of O, N, S, P, F, Cl, Br, I, and combinations of the same.