Abstract:
A method of forming alignment marks in three dimensional (3D) structures and corresponding structures are disclosed. The method includes forming apertures (126) in a first surface of a first semiconductor substrate; joining the first surface of the first semiconductor substrate to a first surface of a second semiconductor substrate; thinning the first semiconductor on a second surface of the first semiconductor substrate to provide optical contrast between the apertures and the first semiconductor substrate (116); and aligning a feature on the second surface of the first semiconductor substrate using the apertures as at least one alignment mark.
Abstract:
A through-substrate via (TSV) structure that is immune to metal contamination due to a backside planarization process is provided. After forming a through-substrate via (TSV) trench, a diffusion barrier liner is conformally deposited on the sidewalls of the TSV trench. A dielectric liner is formed by depositing a dielectric material on vertical portions of the diffusion barrier liner. A metallic conductive via structure is formed by subsequently filling the TSV trench. Horizontal portions of the diffusion barrier liner are removed. The diffusion barrier liner protects the semiconductor material of the substrate during the backside planarization by blocking residual metallic material originating from the metallic conductive via structure from entering into the semiconductor material of the substrate, thereby protecting the semiconductor devices within the substrate from metallic contamination.
Abstract:
A temporary substrate (901) having an array of first solder pads (192) is bonded to the front side of a first substrate (101) by reflowing an array of first solder balls (250). The first substrate (101) is thinned by removing the back side, and an array of second solder pads (142) is formed on the back side surface of the first substrate (101). The assembly of the first substrate (101) and the temporary substrate (901) is diced to form a plurality of stacks, each including an assembly of a first semiconductor chip (100) and a handle portion (900). A second semiconductor chip (200) is bonded to an assembly through an array of the second solder balls (150). The handle portion (900) is removed from each assembly by reflowing the array of the first solder balls (250), while the array of the second solder balls (150) does not refiow. The assembly is subsequently mounted on a packaging substrate (300) employing the array of the first solder balls (250).
Abstract:
The present disclosure provides a thermo-mechanically reliable copper TSV and a technique to form such TSV during BEOL processing. The TSV constitutes an annular trench which extends through the semiconductor substrate. The substrate defines the inner and outer sidewalls of the trench, which sidewalls are separated by a distance within the range of 5 to 10 microns. A conductive path comprising copper or a copper alloy extends within said trench from an upper surface of said first dielectric layer through said substrate. The substrate thickness can be 60 microns or less. A dielectric layer having interconnect metallization conductively connected to the conductive path is formed directly over said annular trench.
Abstract:
A TSV can be formed having a top section via formed through the top substrate surface and a bottom section via formed through the bottom substrate surface. The top section cross section can have a minimum cross section corresponding to design rules, and the top section depth can correspond to a workable aspect ratio. The top section via can be filled or plugged so that top side processing can be continued. The bottom section via can have a larger cross section for ease of forming a conductive path therethrough. The bottom section via extends from the back side to the bottom of the top section via and is formed after the substrate has been thinned. The TSV can be completed by forming a conductive path after removing sacrificial fill materials from the joined top and bottom section vias.
Abstract:
A microelectronic assembly and method of forming a through hole extending through a first and second wafer are provided. The first and second wafer have confronting faces and metallic features at the faces which are joined together to assemble the wafers. A hole can be etched through the first wafer until a gap is exposed between the confronting faces. The hole can have a first wall and a second wall sloping inwardly from the first wall to an opening through which the gap is exposed. Material of the first or second wafers exposed within the hole can then be sputtered creating a wall between the confronting faces. The hole can be etched so as to extend the first wall through the first wafer, such that the wall of the hole extends continuously from the first wafer into the second wafer. An electrically conductive through silicon via can then be formed.
Abstract:
Leckstrom-Messstruktur (200) für Durchkontaktierungen, die aufweist:ein Halbleitersubstrat (402), das eine aktive Schicht aufweist;eine Vielzahl von Substratdurchkontaktierungen (212A-E; 302; 412) in dem Halbleitersubstrat, die sich erheblich durch das Halbleitersubstrat erstrecken; undeine Leckstrom-Messstruktur, die sich in der aktiven Schicht des Halbleitersubstrats befindet, die aufweist:eine Vielzahl von Substratkontakten (214A-E; 306; 414), die sich in das Halbleitersubstrat erstrecken;eine Vielzahl von Erfassungsschaltungen, die mit der Vielzahl von Substratdurchkontaktierungen (216A-E; 300; 416) und mit der Vielzahl von Substratkontakten verbunden sind, wobei die Vielzahl von Erfassungsschaltungen eine Vielzahl von Ausgaben (310) bereitstellen, die auf einen Leckstrom aus der Vielzahl von Substratdurchkontaktierungen hindeuten;eine BIST-Maschine (222) für einen integrierten Selbsttest, um schrittweise eine Prüfung der Vielzahl von Substratdurchkontaktierungen durchzuführen; undeinen Speicher (218), der mit der BIST-Maschine verbunden ist, um die Ausgaben von der Vielzahl von Erfassungsschaltungen zu empfangen,wobei die Leckstrom-Messstruktur auf einen Leckstrom aus jeder der Substratdurchkontaktierungen in das Halbleitersubstrat und einen Leckstrom aus jeder der Substratdurchkontaktierungen in eine weitere Substratdurchkontaktierung prüft.
Abstract:
The present disclosure provides a thermo-mechanically reliable copper TSV and a technique to form such TSV during BEOL processing. The TSV constitutes an annular trench which extends through the semiconductor substrate. The substrate defines the inner and outer sidewalls of the trench, which sidewalls are separated by a distance within the range of 5 to 10 microns. A conductive path comprising copper or a copper alloy extends within said trench from an upper surface of said first dielectric layer through said substrate. The substrate thickness can be 60 microns or less. A dielectric layer having interconnect metallization conductively connected to the conductive path is formed directly over said annular trench.
Abstract:
Disclosed is a semiconductor device wherein an insulation layer has a via opening with an aluminum layer in the via opening and in contact with the last wiring layer of the device. There is a barrier layer on the aluminum layer followed by a copper plug which fills the via opening. Also disclosed is a process for making the semiconductor device.
Abstract:
A lead free solder hierarchy structure for electronic packaging that includes organic interposers. The assembly may also contain passive components as well as underfill material. The lead free solder hierarchy also provides a lead free solder solution for the attachment of a heat sink to the circuit chip with a suitable lead free solder alloy.