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Journal of Materials Science

, Volume 46, Issue 21, pp 7012–7025 | Cite as

Liquid phase sintered Cu–In composite solders for thermal interface material and interconnect applications

  • J. Liu
  • P. Kumar
  • I. DuttaEmail author
  • R. Raj
  • R. Sidhu
  • M. Renavikar
  • R. Mahajan
Article

Abstract

This study reports on the processing and characterization of composite solders produced by liquid phase sintering, which comprise a high-melting phase such as Cu embedded in a matrix of a low-melting phase such as In. These solders combine higher electrical/thermal conductivities with high mechanical compliance, and are suitable for a range of next-generation thermal interface material and interconnect applications. After considering a range of compositions, a solder with 60 volume percent In was found to possess the requisite combination of compliance and conductivity. A thin interfacial Au layer was utilized for the dual purposes of (a) enhancing the wetting between Cu and In, and (b) reducing interfacial reaction between Cu and In to form coarse intermetallic compounds (IMC) scallops, which adversely affect both mechanical and electrical/thermal properties. The Au layer increased the thermal conductivity of the solder by a factor of ~2 while reducing the yield strength to make the solder more compliant. The effects of particle size, shape, and volume fraction are discussed, and a simple model is utilized to explain the trends in the mechanical and the thermal properties.

Keywords

Yield Strength Electrical Resistivity Solder Joint Contact Resistance Liquid Phase Sinter 

Notes

Acknowledgements

This research was supported by a grant from INTEL Corporation through the Strategic Research Segment (SRS) program. Partial support from NSF-CMMI-0709506 and NSF-DMR-0939392 is also acknowledged.

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Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  • J. Liu
    • 1
  • P. Kumar
    • 1
  • I. Dutta
    • 1
    Email author
  • R. Raj
    • 2
  • R. Sidhu
    • 3
  • M. Renavikar
    • 3
  • R. Mahajan
    • 3
  1. 1.School of Mechanical and Materials EngineeringWashington State UniversityPullmanUSA
  2. 2.Department of Mechanical EngineeringUniversity of ColoradoBoulderUSA
  3. 3.Assembly Technology DevelopmentINTEL CorporationChandlerUSA

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