Patent ID: 6340833
Filing Date: 2002-01-22
Classification: H01L

Abstract:
Polysilicon resistors on a substrate comprised of:a substrate having field oxide regions on surface of said substrate; a patterned polysilicon layer doped to form said polysilicon resistors having a first end and a second end on said field oxide regions a metal silicide layer over and on said first end of said polysilicon resistors; an interlevel dielectric layer having contact holes to said first and second ends of said polysilicon resistors, said contact holes to said first end are over and to said metal silicide layer; metal plugs in said contact holes; a metal layer patterned to form interconnections to said metal plugs; said patterned metal layer extending over said polysilicon resistors to prevent hydrogen from diffusing through said interlevel dielectric layer and into said polysilicon resistors; and spaces resulting between said interconnections over said polysilicon resistor are aligned over said silicide layer, wherein said silicide layer provides further protection from said hydrogen diffusion.