28-02-2019 дата публикации
Номер: US20190067037A1
Принадлежит:
A flip-chip manufacture is described. Methods of blocking adhesive underfill in flip-chip high speed component manufacture include creating topology discontinuities to prevent adhesive underfill material from interacting with RF sensitive regions on substrates. 1. A flip-chip structure utilizing two adjacent layers , the flip-chip structure comprising:at least one topology discontinuity formed, on at least one of a pair of opposed surfaces of the two adjacent layers, outside at least one sensitive region of the flip-chip structure; andadhesive underfill material, between the pair of opposed surfaces, substantially outside the at least one sensitive region to create a substantially adhesive underfill material-free region.2. The flip-chip structure as claimed in claim 1 , the topology discontinuity being configured to snag a liquid meniscus of the adhesive underfill material.3. The flip-chip structure as claimed in claim 1 , the topology discontinuity being configured to snag a liquid meniscus of a non-adhesive underfill material immiscible with the adhesive underfill material.4. The flip-chip structure as claimed in claim 1 , wherein the substantially adhesive underfill material-free region is vented.5. The flip-chip structure as claimed in claim 1 , further comprising a via in a one of the layers configured to vent the at least one adhesive underfill material free region.6. The flip-chip structure as claimed in claim 1 , the topology discontinuity comprising one of a surface variation and a surface roughness.7. The flip-chip structure as claimed in claim 6 , the surface variation comprising a protruding patterned material layer comprising one of Al claim 6 , Au claim 6 , Cr claim 6 , Cu claim 6 , Ni claim 6 , Pd claim 6 , Pt claim 6 , Ti claim 6 , TW claim 6 , W claim 6 , Al203 claim 6 , AlN claim 6 , SiO2 claim 6 , Si3N4 claim 6 , SixNOy claim 6 , Polyimide claim 6 , polyamide claim 6 , patternable polymer and epoxy.8. The flip-chip structure as claimed in claim 6 ...
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