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- W2108482824 abstract "Low temperature bonding technology is developed using In-alloy on Au at a low temperature below 200˚C forming robust intermetallics (IMC) joints with high re-melting temperature (>300˚C), so that after bonding the IMC joints can withstand the subsequent processes without any degradation. Using similarly solder system and methodology, chips to wafer (C2W) bonding method has been developed, as such chips are temporary bonded onto wafer before the final bonding. The chips are bonded onto the wafer by two sequential bonding condition; temporary followed by a final bonding, which is 200/90˚C (chip/wafer) for 20sec and 180/180˚C for 5mins. The IMC joints are evaluated in terms of microstructure and compositional observations by means of scanning electron microscope (SEM) and transmittance electron microscope (TEM). As a result, it was confirmed that the joint was completely occupied with the Au-In based IMC phases. These IMC joint showed a tensile strength of 120~330N (23.5~38.8MPa). Based on this study, the 3 stacked dice with 8×8 mm2 dies with ~1700 I/Os of 80um solder bumps were fabricated in a chip to wafer stacking method. It showed uniform bonding all over the die in each layer with relatively good tensile strength achieved. Furthermore, it also underwent 3 times reflow test at 260˚C. The IMC joint was examined after going through the reflows test and the bonded samples exhibited neither de-lamination nor any changes in the microstructure." @default.
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- W2108482824 date "2009-12-01" @default.
- W2108482824 modified "2023-09-27" @default.
- W2108482824 title "Thin die stacking by low temperature In/ Au IMC based bonding method" @default.
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- W2108482824 doi "https://doi.org/10.1109/eptc.2009.5416503" @default.
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