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Micro-Raman spectroscopic technique has been employed to study the induced stress/strain by the metal microbumps in 3D-LSI Si die/wafer after wafer thinning and bonding, and the impact of bump spacing, bump size, bonding temperature and bonding force in the stress distribution in such a microbump bonded LSIs has been investigated. It is inferred that (i) the Si present at the interface (between CuSn...
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