Inventors:
Cyril Cabral, Jr. - Mahopac NY, US
Hariklia Deligianni - Tenafly NJ, US
Randolph F. Knarr - Putnam Valley NY, US
Sandra G. Malhotra - Santa Clara CA, US
Stephen Rossnagel - Pleasantville NY, US
Xiaoyan Shao - Yorktown Heights NY, US
Anna Topol - Wappingers Falls NY, US
Philippe M. Vereecken - Leuven, BE
Assignee:
International Business Machines Corporation - Armonk NY
International Classification:
H01L 21/4763
US Classification:
438630, 438626, 438627, 438631, 438675, 257E21476
Abstract:
A contact metallurgy structure comprising a patterned dielectric layer having cavities on a substrate; a silicide or germanide layer such as of cobalt and/or nickel located at the bottom of cavities; a contact layer comprising Ti or Ti/TiN located on top of the dielectric layer and inside the cavities and making contact to the silicide or germanide layer on the bottom; a diffusion barrier layer located on top of the contact layer and inside the cavities; optionally a seed layer for plating located on top of the barrier layer; a metal fill layer in vias is provided along with a method of fabrication. The metal fill layer is electrodeposited with at least one member selected from the group consisting of copper, rhodium, ruthenium, iridium, molybdenum, gold, silver, nickel, cobalt, silver, gold, cadmium and zinc and alloys thereof. When the metal fill layer is rhodium, ruthenium, or iridium, an effective diffusion barrier layer is not required between the fill metal and the dielectric. When the barrier layer is platable, such as ruthenium, rhodium, platinum, or iridium, the seed layer is not required.