Muncy, Geissler, Olds & Lowe, P.C.
Multi-chip stacking method to reduce voids between stacked chips
A multi-chip stacking method to reduce voids between stacked chips is revealed. A first chip is disposed on a substrate, and a plurality of first bonding wires are formed by wire bonding to electrically connect the first chip and the substrate. A second chip is disposed on an active surface of the first chip where a FOW (film over wire) adhesive is formed on a back surface of the second chip. The FOW adhesive partially encapsulates the first bonding wires and adheres to the active surface of the first chip. Then, the substrate is placed in a pressure oven to provide a positive pressure greater than one atm during thermally curing the FOW adhesive with exerted pressures. Accordingly, voids can be reduced inside the FOW adhesive during the multi-chip stacked processes where issues of poor adhesion and popcorn between chips can be avoided.
Walton Advanced Engineering, Inc.
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additional additional inventional additional inventional additional additional additional inventional additional additional additional additional additional inventional additional additional additional inventional additional additional inventional inventional additional additional additional additional additional additional inventional additional additional additional additional additional additional additional inventional inventional additional inventional inventional additional additional additional additional additional additional additional inventional additional additional additional additional additional additional additional additional
Yung-Hsiang Wen-Chun Kuo-Yuan
Chen Chiu Lee