International Business Machines Corporation
Structure and Method for Bridge Chip Assembly with Capillary Underfill

Abstract:

A method for fabricating a bridge chip assembly for interconnecting two or more IC dies is provided. Each of the IC dies has a first region including first connections having a first pitch and has a second region including second connections or connection pads having a second pitch, the first pitch being greater than the second pitch. The method includes: attaching a non-conductive underfill film on an upper surface of at least the second region of each of the IC dies; bonding the second connections/connection pads of a first IC die to corresponding first connection pads/connections of a bridge chip; and bonding the second connections/connection pads of a second IC die to the bridge chip. The bridge chip assembly includes the bridge chip bonded with the first and second IC dies, and the non-conductive underfill film disposed between the bridge chip and the IC dies.