Enhanced underfill adhesion of flip chips

摘要

A flip chip having a chip passivation layer disposed on a metalization layer. Terminal vias are formed in the passivation layer exposing a portion of the metalization layer and terminal metalization is disposed on the metalization layer at the terminal vias. A stress reducing layer is disposed on the chip passivation layer with underfill apertures formed in the stress reducing layer so as to expose selected portions of the chip passivation layer, thereby enhancing the adhesion of an underfill material to the flip chip.