Adhesion by plasma conditioning of semiconductor chip
First Claim
1. A semiconductor device comprising:
- an integrated circuit chip having active and passive surfaces, said active surface polymer-coated and having a plurality of electrical coupling members;
said chip assembled face-down onto a substrate, whereby said coupling members form a gap between said polymer coat and said substrate;
polymeric underfill material filling said gap, said underfill material adhering to said polymer-coat and said substrate; and
said adhesion of said underfill material being so strong that a force applied from outside breaks said substrate rather than the interface between said underfill and said polymer-coat or said substrate.
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Abstract
A plasma conditioning method of improving the adhesion between an integrated circuit chip, having active and passive surfaces, the active surface polymer-coated and having a plurality of electrical coupling members, and an insulating underfill material. The method comprises the steps of positioning a wafer having a plurality of integrated circuits, including the coupling members, in a vacuum chamber of a plasma apparatus so that the polymer-coated surface faces the plasma source. Next, a plasma is initiated; the ion mean free path is controlled so that the ions reach the wafer surface with predetermined energy. The wafer surface is then exposed to the plasma for a length of time sufficient to roughen the polymer surface, clean the polymer surface from organic contamination and improve the surface affinity to adhesion. The adhesion ability of this surface to organic underfill material is thus enhanced.
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Citations
11 Claims
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1. A semiconductor device comprising:
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an integrated circuit chip having active and passive surfaces, said active surface polymer-coated and having a plurality of electrical coupling members;
said chip assembled face-down onto a substrate, whereby said coupling members form a gap between said polymer coat and said substrate;
polymeric underfill material filling said gap, said underfill material adhering to said polymer-coat and said substrate; and
said adhesion of said underfill material being so strong that a force applied from outside breaks said substrate rather than the interface between said underfill and said polymer-coat or said substrate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11-22. -22. (canceled)
Specification