Patent ID: 6030854
Filing Date: 2000-02-29
Classification: H01L

Abstract:
A method of providing a solder interconnection between a semiconductor device and a substrate comprising the steps of:a) attaching said semiconductor device to said substrate by a plurality of solder connections that extend from said substrate to pads on said semiconductor device to form a gap between said substrate and said semiconductor device, said gap comprising an upper region located adjacent to said semiconductor device and a lower region located adjacent to said substrate;b) filling said gap with a filler comprising a first material containing suspended particles of a second material having a coefficient of thermal expansion that is different than the coefficient of thermal expansion of said first material; andc) heating said filler for a period of time such that a substantial portion or all of said particles subside in said lower region of said filler, such that said lower region has a coefficient of thermal expansion different than the coefficient of thermal expansion of said upper region.