Patent ID: 6586321
Filing Date: 2003-07-01
Classification: H01L,Y10S

Abstract:
A method for forming a metal silicide layer, comprising:performing a first heat treatment on a laminate of a silicon-containing region, a first metal layer on the silicon-containing region, and a second metal layer on the first metal layer, while said laminate is prevented from being oxidized, thereby forming a first metal silicide preliminary layer in a boundary region between the silicon-containing region and the first metal layer; and performing a second heat treatment at a higher temperature than in said first heat treatment on the first metal suicide preliminary layer, thereby changing the first metal suicide preliminary layer into a first metal suicide, thicknesses of the first metal layer and the second metal layer being selected so that all of the second metal layer finishes reaction simultaneously with or before all of the first metal layer on the silicon-containing region finishes reaction when said first heat treatment is performed, said first heat treatment is performed until all of the first metal layer on the silicon-containing region finishes reaction.