Patent ID: 6165861
Filing Date: 2000-12-26
Classification: H01L

Abstract:
A method for making polysilicon resistors on a substrate comprising the steps of:providing said substrate having field oxide regions on surface of said substrate;forming a patterned polysilicon layer having a first end and a second end on said field oxide regions;conductively doping said patterned polysilicon layer to a predetermined concentration to form resistors;forming a metal silicide layer over and on said first end of said patterned polysilicon layer;depositing an interlevel dielectric layer over said patterned polysilicon layer;forming contact holes in said interlevel dielectric layer to said first and second ends of said patterned polysilicon layer, wherein said contact holes to said first end are over and to said metal silicide layer;depositing a metal layer and patterning to form interconnections and to make first and second metal contacts to said first and second ends of said patterned polysilicon layer, also said patterned metal layer extending over said patterned polysilicon layer to prevent hydrogen from diffusing through said interlevel dielectric layer and into said patterned polysilicon layer that forms said resistors; and further,said patterned metal layer having spaces between said first contacts and said second contacts extending over said metal silicide layer, wherein said metal silicide layer provides further protection from said hydrogen diffusion.