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- W2894870940 abstract "We review five solder joint reactions in 3D IC packaging technology which are of wide interest: (1) Scallop-type growth of Cu6Sn5 in solid-liquid interdiffusion reaction, (2) Whisker-type growth of Sn crystals at room temperature, (3) Layer-type intermetallic compound (IMC) growth in solid state aging, (4) Porous-type growth of Cu3Sn in μ-bumps, and (5) Pillar-type growth of Cu/Sn IMC down to 1 μm in diameter. The first two have been well covered in books and reviews on solder joint technology, so only certain specific comments will be given here. On the other three, the layer-type IMC growth has been a long standing kinetic problem due to the extremely small concentration gradient across a stoichiometric IMC, but it has been resolved now, following Wagner’s approach. The porous-type Cu3Sn was found in 2014. Kinetically, it is a complete cellular precipitation, containing a set of lamellar pores. It is rare because up to now all cellular precipitations are incomplete. The pillar-type Cu/Sn reactions down to 1 μm in diameter were carried out in 2016. Owing to a large surface/volume ratio, the reaction is controlled by surface diffusion, accompanied by interstitial diffusion of Cu in Sn." @default.
- W2894870940 created "2018-10-12" @default.
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- W2894870940 date "2019-04-01" @default.
- W2894870940 modified "2023-10-18" @default.
- W2894870940 title "Recent advances on kinetic analysis of solder joint reactions in 3D IC packaging technology" @default.
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- W2894870940 doi "https://doi.org/10.1016/j.mser.2018.09.002" @default.
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