Patent ID: 8236693

Claim:
A method of forming silicides of different thickness on different materials of a device comprising the steps of: forming a first region of first silicon and a second region of second silicon; covering the first region with a diffusion blocking layer while exposing the second region; depositing a first metal layer over the first and second regions; annealing the device a first time, thereby forming a silicide of a first thickness by reacting the first metal layer and the exposed second silicon of the second region; removing the blocking layer and un-reacted first metal from the first region; depositing a second metal layer over the first region and the first thickness of silicide of the second region; and annealing the device a second time, thereby forming a silicide of a second thickness by reacting the second metal layer and the exposed silicon of the first region and forming a silicide of a third thickness by reacting the second metal layer and the first thickness of silicide of the second layer; wherein the first thickness, the second thickness, and the third thickness are each different with respect to one another.