Abstract:
A system and method for plating a contact is provided. An embodiment comprises forming protective layers over a contact and a test pad, and then selectively removing the protective layer over the contact without removing the protective layer over the test pad. With the protective layer still on the test pad, a conductive layer may be plated onto the contact without plating it onto the test pad. After the contact has been plated, the protective layer over the contact may be removed.
Abstract:
A method includes bonding a wafer on a carrier through an adhesive, and performing a thinning process on the wafer. After the step of performing the thinning process, a portion of the adhesive not covered by the wafer is removed, while the portion of the adhesive covered by the wafer is not removed.
Abstract:
A system and method for determining underfill expansion is provided. An embodiment comprises forming cover marks along a top surface of a substrate, attaching a semiconductor substrate to the top surface of the substrate, placing an underfill material between the semiconductor substrate and the substrate, and then using the cover marks to determine the expansion of the underfill over the top surface of the substrate. Additionally, cover marks may also be formed along a top surface of the semiconductor substrate, and the cover marks on both the substrate and the semiconductor substrate may be used together as alignment marks during the alignment of the substrate and the semiconductor substrate.
Abstract:
A method and structure for good adhesion of Intermetallic Compounds (IMC) on Cu pillar bumps are provided. The method includes depositing Cu to form a Cu pillar layer, depositing a diffusion barrier layer on top of the Cu pillar layer, and depositing a Cu cap layer on top of the diffusion barrier layer, where an intermetallic compound (IMC) is formed among the diffusion barrier layer, the Cu cap layer, and a solder layer placed on top of the Cu cap layer. The IMC has good adhesion on the Cu pillar structure, the thickness of the IMC is controllable by the thickness of the Cu cap layer, and the diffusion barrier layer limits diffusion of Cu from the Cu pillar layer to the solder layer. The method can further include depositing a thin layer for wettability on top of the diffusion barrier layer prior to depositing the Cu cap layer.
Abstract:
Methods and apparatus for performing molding on die on wafer interposers. A method includes receiving an interposer assembly having a die side and an opposite side including two or more integrated circuit dies mounted on the die side of the interposer, the interposer assembly having spaces formed on the die side of the interposer between the two or more integrated circuit dies; mounting at least one stress relief feature on the die side of the interposer assembly in one of the spaces between the two or more integrated circuit dies; and molding the integrated circuit dies using a mold compound, the mold compound surrounding the two or more integrated circuit dies and the at least one stress relief feature. An apparatus is disclosed having integrated circuits mounted on a die side of an interposer, stress relief features between the integrated circuits and mold compound over the integrated circuits.
Abstract:
A method includes bonding a first package component on a first surface of a second package component, and probing the first package component and the second package component from a second surface of the second package component. The step of probing is performed by probing through connectors on the second surface of the second package component. The connectors are coupled to the first package component. After the step of probing, a third package component is bonded on the first surface of the second package component.
Abstract:
A method includes bonding a carrier over a top die. The method further includes curing an underfill disposed between a substrate and the top die. The method further includes applying a force over the carrier during the curing. The method further includes removing the carrier from the top die.
Abstract:
The mechanisms for forming bumps on packaged dies and package substrates reduce variation of bump heights across the packaged dies and packaged substrates. Bumps are designed to have different widths to counter the higher plating current near edge(s) of dies or substrates. Bump sizes can be divided into different zones depending on the bump patterns and densities across the packaged die and/or substrates. Smaller bumps near edges reduce the thickness of plated film(s), which would have been thicker due to being near the edges. As a result, the bump heights across the packaged dies and/or substrates can be kept significantly constant and chip package can be properly formed.
Abstract:
A method for forming a semiconductor structure. A semiconductor substrate including a plurality of dies mounted thereon is provided. The substrate includes a first portion proximate to the dies and a second portion distal to the dies. In some embodiments, the first portion may include front side metallization. The second portion of the substrate is thinned and a plurality of conductive through substrate vias (TSVs) is formed in the second portion of the substrate after the thinning operation. Prior to thinning, the second portion may not contain metallization. In one embodiment, the substrate may be a silicon interposer. Further back side metallization may be formed to electrically connect the TSVs to other packaging substrates or printed circuit boards.
Abstract:
A method includes molding a polymer onto a package component. The step of molding includes a first molding stage performed at a first temperature, and a second molding stage performed at a second temperature different from the first temperature.