Patent ID: 7312150
Filing Date: 2007-12-25
Classification: H01L

Abstract:
1. A method of forming a cobalt disilicide layer, comprising the steps of: forming a cobalt metal layer that contacts a surface of a silicon region, by exposing the surface to a source gas comprising Co converting at least a first portion of the cobalt metal layer into a cobalt silicide layer by thermally treating the cobalt metal layer at a temperature in a range between about 300° C. and about 600° C. while simultaneously exposing the cobalt metal layer to an ultra high vacuum having a pressure in a range between about 10 removing at least a second portion of the cobalt metal layer to expose the cobalt silicide layer; and converting a first portion of the cobalt silicide layer into a cobalt disilicide layer by thermally treating the first portion of the cobalt silicide layer at a temperature in a range between about 600° C. and about 900° C.