Textured metallic compression bonding
First Claim
1. In combination(a) a semiconductor integrated circuit chip having an integrated circuit connected to a plurality of metallic chip pads located on a major surface of the chip;
- (b) a carrier upon which are located metallic wiring interconnections having metallic carrier pads that are .Iadd.compression .Iaddend.bonded to the chip pads, each of .Iadd.either .Iaddend.the carrier pads.[.,.]. .Iadd.or the .Iaddend.chip pads, .[.or.]. .Iadd.but not .Iaddend.both.Iadd., .Iaddend.having at least a portion thereof that is textured .Iadd.prior to bonding .Iaddend.with indentations whose depths are.[., or protrusions whose heights are,.]. of the order of one micrometer.
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Accused Products
Abstract
Integrated circuit chip-to-chip interconnections are made via gold pads on each chip that are bonded to corresponding gold pads on a silicon wafer chip carrier. The pads on the chips and/or the pads on the carrier are characterized by texturing (roughening) with a feature size of the order of a micrometer or less, so that each of the pads on the chip can be attached to each of the pads on the carrier by compression bonding at room temperature--i.e., cold-well bonding. In particular, the texturing of the gold pads on the silicon carrier is obtained by etching V-grooves locally on the surface of the underlying silicon carrier in the regions of the pads, thermally growing a silicon dioxide layer on the silicon career, and depositing the gold on the silicon dioxide layer.
87 Citations
14 Claims
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1. In combination
(a) a semiconductor integrated circuit chip having an integrated circuit connected to a plurality of metallic chip pads located on a major surface of the chip; (b) a carrier upon which are located metallic wiring interconnections having metallic carrier pads that are .Iadd.compression .Iaddend.bonded to the chip pads, each of .Iadd.either .Iaddend.the carrier pads.[.,.]. .Iadd.or the .Iaddend.chip pads, .[.or.]. .Iadd.but not .Iaddend.both.Iadd., .Iaddend.having at least a portion thereof that is textured .Iadd.prior to bonding .Iaddend.with indentations whose depths are.[., or protrusions whose heights are,.]. of the order of one micrometer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 11, 12)
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10. The combination of claim .[.10.]. .Iadd.9 .Iaddend.in which the surfaces of the chip pads are essentially .[.gold.]. .Iadd.gold.Iaddend..
- 13. mechanical pulling apart. .Iaddend. .Iadd.20. The combination of claim 19 in which the surface of the first metallic layer is essentially gold. .Iaddend. .Iadd.21. The combination of claim 13 in which a surface of the
Specification