Patent ID: 8963340
Filing Date: 2015-02-24
Classification: H01L

Abstract:
1. A preassembly semiconductor device comprising; a) a semiconductor chip comprising chip soldering structures C4 connectors; b) a substrate comprising substrate soldering structures that correspond to and extend toward said chip soldering structures for forming solder connections with said chip soldering structures, the height of said substrate soldering structures being greater than the height of said chip soldering structures; c) said chip and said substrate being in preassembly positions relative to one another; d) a single pre-applied underfill covering said substrate soldering structures not substantially beyond their tops; whereby the amount of said underfill is adjusted to obtain better yields of a semiconductor device assembled from thermal compression of said pre-assembly; a) to decrease the amount of underfill pushed away from the tops of said substrate soldering structures during said assembly, b) to be present in an amount to enable said substrate soldering structures to be substantially free of voids during said assembly, c) whereby said thermal compression decreases any gap between the surfaces of said substrate and said chip and, b) wherein the said thermal compression converts said substrate soldering structures and said chip soldering structures into a monolith, and c) said underfill is also present in an amount to substantially encapsulate the entire said monolith.