Patent ID: 6740587
Filing Date: 2004-05-25
Classification: H01L

Abstract:
A method of forming a metal silicide layer in a semiconductor device comprising:i) providing a substrate; ii) forming an insulation layer on the substrate, the insulation layer having an opening therein; iii) depositing a metal in the opening in the insulation layer so that a first layer including a native metal silicide layer of a first phase is formed at an interfacial surface between the substrate and the deposited metal; iv) selectively removing the first layer while retaining the native metal silicide layer of the first phase; v) forming a second layer made of a doped polycrystalline silicon layer on the native metal silicide layer of the first phase and the insulation layer; and vi) reacting the native metal silicide layer of the first phase with the substrate so as to transform the native metal silicide layer into a metal silicide layer having a second phase which has a first stoichiometrical composition ratio different from a second stoichiometrical composition ratio of the first phase and a thickness of less than about 100 Ã¥.