Journal of Electronic Materials

, Volume 48, Issue 1, pp 25–31 | Cite as

Reaction Within Ni/Sn/Cu Microjoints for Chip-Stacking Applications

  • Y. W. Wang
  • W. L. Shih
  • H. T. Hung
  • C. R. KaoEmail author
TMS2018 Microelectronic Packaging, Interconnect, and Pb-free Solder
Part of the following topical collections:
  1. TMS2018 Advanced Microelectronic Packaging, Emerging Interconnection Technology, and Pb-free Solder


The reaction within Ni/Sn/Cu microjoints has been investigated with a 10 μm initial thickness of Sn so that Sn was quickly consumed in the early stage of the reaction, transforming the joints into full intermetallic joints. Accordingly, the emphasis of the present study is on the materials interactions in such full intermetallic joints. Ni/Sn/Cu sandwiches were prepared by thermal compression bonding. High-temperature storage tests were conducted at 150°C, 180°C, and 200°C for different time periods. The hardness and Young’s modulus of the intermetallic joints were measured using nanoindentation. The key finding of this study is that, once Sn was exhausted, the originally planar (Cu,Ni)3Sn grew preferably along the grain boundary of (Cu,Ni)6Sn5, creating a highly nonuniform (Cu,Ni)3Sn growth front. Both the hardness and elastic modulus increased with the Ni concentration in the intermetallics.


Microjoints microstructure volume effect mechanical properties 


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Financial support from the Ministry of Science and Technology of Taiwan through Grants 104-2221-E-002-040-MY3 and 104-2221-E-002-052-MY3 is acknowledged. The authors are grateful for the technical help provided by AC-GMST of National Taiwan University.


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Copyright information

© The Minerals, Metals & Materials Society 2018

Authors and Affiliations

  • Y. W. Wang
    • 1
  • W. L. Shih
    • 1
  • H. T. Hung
    • 1
  • C. R. Kao
    • 1
    • 2
    Email author
  1. 1.Department of Materials Science and EngineeringNational Taiwan UniversityTaipei CityTaiwan
  2. 2.Advanced Research Center of Green Materials Science and TechnologyNational Taiwan UniversityTaipeiTaiwan

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