Patent ID: 6690072
Filing Date: 2004-02-10
Classification: H01L

Abstract:
A MOSFET (Metal Oxide Semiconductor Field Effect Transistor) having a vertically self-aligned cobalt silicide, said MOSFET comprising:a layer of SiGe; a gate structure formed on said layer of SiGe; a source diffusion region formed in said layer of SiGe; a drain diffusion region formed in said layer of SiGe; and a cobalt silicide layer formed over at least one of said source diffusion region and said drain diffusion region, said cobalt silicide layer being essentially vertically self-aligned with said layer of SiGe in that said cobalt silicide layer directly contacts said SiGe layer and consumes substantially no silicon or germaniurn from said SiGe layer, said cobalt silicide composed essentially of silicon and cobalt and essentially free of precipitates and an interface between said SiGe layer and said cobalt silicide being essentially free of precipitates.