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Thermal Oxidation of Ni and Co Alloys Formed by Electroless Plating

Published online by Cambridge University Press:  01 February 2011

Jeff Gambino ,
Igor Ivanov ,
Steve Mongeon ,
Ed Adams ,
Scott Hazel ,
Dave Meatyard ,
Phil Pokrinchak ,
Fen Chen ,
Pat DeHaven  and
Artur Kolics
...Show all authors
Jeff Gambino
Affiliation:
gambinoj@us.ibm.com, IBM Microelectronics, Z/975A, 1000 River Street, Essex Junction, VT, 05452, United States, 802-769-0433
Igor Ivanov
Affiliation:
igor.ivanov@blue29.com, Blue29, Inc., Sunnyvale, CA, 94089, United States
Steve Mongeon
Affiliation:
smongeon@us.ibm.com, IBM Microelectronics, Essex Junction, VT, 05452, United States
Ed Adams
Affiliation:
edadams@us.ibm.com, IBM Microelectronics, Essex Junction, VT, 05452, United States
Scott Hazel
Affiliation:
dshazel@us.ibm.com, IBM Microelectronics, Essex Junction, VT, 05452, United States
Dave Meatyard
Affiliation:
dmeat@us.ibm.com, IBM Microelectronics, Essex Junction, VT, 05452, United States
Phil Pokrinchak
Affiliation:
dpokrinc@us.ibm.com, IBM Microelectronics, Essex Junction, VT, 05452, United States
Fen Chen
Affiliation:
chenfe@us.ibm.com, IBM Microelectronics, Essex Junction, VT, 05452, United States
Pat DeHaven
Affiliation:
dehaven@us.ibm.com, IBM Microelectronics, Hopewell Junction, NY, 12533, United States
Artur Kolics
Affiliation:
artur.kolics@blue29.com, Blue29, Inc., Sunnyvale, CA, 94089, United States
Marina Polyanskaya
Affiliation:
marina.polyanskaya@blue29.com, Blue29, Inc., Sunnyvale, CA, 94089, United States
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Abstract

The thermal oxidation of Co alloy and Ni alloy thin films on top of Cu, has been studied as a function of film composition. Four different alloys were studied; CoWP, CoWB, CoMoB, and NiMoB. For the Co alloys, significant oxidation is observed after an air anneal above 350C, accompanied by Cu diffusion through the film to the surface. In contrast, for the NiMoB films, there is minimal oxidation of the surface even after a 400C anneal in air, and Cu diffusion through the film is greatly reduced. These results indicate that Ni-based barriers may be desirable in applications where self-aligned metal layers are used on top of Cu interconnects as a replacement for dielectric caps such as SiN and SiCN.

Keywords

oxidationCubarrier layer
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 914: Symposium F – Materials, Technology and Reliability of Low-k Dielectrics and Copper Interconnects , 2006 , 0914-F05-09
Copyright
Copyright © Materials Research Society 2006

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