4.6 Article

Novel transient liquid phase bonding method using In-coated Cu sheet for high-temperature die attach

Journal

MATERIALS RESEARCH BULLETIN
Volume 149, Issue -, Pages -

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.materresbull.2021.111713

Keywords

TLP bonding; Coating materials; Intermetallic; Microstructure; Die attach

Funding

  1. Nanjing University of Aeronautics and Astronautics PhD short-term visiting scholar project [190908DF06]

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A novel TLP bonding method using In-coated Cu sheet was designed for high-temperature die attach, showing significant improvement in the mechanical properties of joints bonded under different parameters, although the brittle characteristics and location of the fracture remained almost unchanged for the different bonding parameters.
To meet the increasing demand for thermal stability in electronic packaging required for next-generation power modules, transient liquid phase (TLP) bonding of Cu/In system is concerned owing to its high remelting temperature and high strength. In this study, a novel TLP bonding method using In-coated Cu sheet was designed for high-temperature die attach. The microstructure and mechanical properties of joints bonded for different parameters were investigated. It was found that the In-coated Cu sheet could join electroless Ni/immersion Au (ENIG)-finished Cu disks strongly by forming two intermetallic compound (IMC) bondlines of delta-(Cu, In), Ni28In72, and AuIn2. With increasing bonding temperature and time, AuIn2 was consumed, while delta-(Cu, In) and Ni28In72 coarsened, reducing the defects in the bondline. Therefore, the shear strength of the bonded joint increased from 16.9 MPa to 38.0 MPa. However, the brittle characteristics and location of the fracture remained almost unchanged for the different bonding parameters.

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