摘要:
A microelectronic assembly and related method of forming a through hole extending through a first chip and a second chip are provided. The first and second chip have confronting faces, metallic features join the first and second chips leaving a gap chips . A first etch creates a hole through the first chip. The hole has a first wall extending in a vertical direction, and a second wall sloping inwardly from the first wall to an inner opening to expose the gap. Material of the first or second chips exposed within the hole is sputtered to form a wall in the gap. A second etch extends the hole into the second chip. An electrically conductive through silicon via can then be formed extending through the first chip, the wall between the chips and into the second chip.
摘要:
The present invention includes embodiments of a processing method, and resulting structure, for building a chip having a TSV pillar which can be used as an interconnecting structure. The process includes the deposition of a dual diffusion barrier between the TSV and the substrate the TSV is embedded within. The TSV is then exposed from the back side of the substrate so that at least a portion of the TSV protrudes from the substrate and can be used as a contact for connecting the chip to another surface. The resulting TSV is rigid, highly conductive, can be placed in a tightly pitched grid of contacts, and reduces effects of CTE mismatch.
摘要:
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.
摘要:
A tool that allows three dimensional chip circuit designs to be checked subsequent to 3D design layer mirroring. The 3D chip design is converted to a corresponding 2D chip design by mirroring one or more design layers from the mirrored side of a 3D design and merging those design layers with unmirrored design layers from the unmirrored side of a 3D design. The converted circuit design can be processed by standard verification checks. The tool may also receive design layers corresponding to an integrated circuit that will pass through multiple semiconductor chips. Each design cell is examined to determine if it corresponds to a mirrored or unmirrored side of its respective semiconductor chip. If the respective design cell corresponds to the mirrored side, the design cell is mirrored. All mirrored cells are then merged with the unmirrored design cells in the correct order. The merged design is processed by standard verification checks. The tool also has the capability to create terminal metal abstracts for two adjoining chips. One of the abstracts is mirrored and then merged with the other for connectivity and alignment checking.
摘要:
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 is can be completed by forming a conductive path after removing sacrificial fill materials from the joined top and bottom section vias.
摘要:
A through-silicon via (TSV) structure forming a unique coaxial or triaxial interconnect within the silicon substrate. The TSV structure is provided with two or more independent electrical conductors insulated from another and from the substrate. The electrical conductors can be connected to different voltages or ground, making it possible to operate the TSV structure as a coaxial or triaxial device. Multiple layers using various insulator materials can be used as insulator, wherein the layers are selected based on dielectric properties, fill properties, interfacial adhesion, CTE match, and the like. The TSV structure overcomes defects in the outer insulation layer that may lead to leakage. A method of fabricating such a TSV structure is also described.
摘要:
A method includes patterning a photoresist layer on a structure to define an opening and expose a first planar area on a sacrificial substrate layer, etching to the exposed first planar area to form a cavity having a first depth in the structure, removing a portion of the photoresist to increase the size of the opening to define a second planar area on the sacrificial substrate layer, forming a doped portion in the sacrificial substrate layer, and etching the cavity to increase the depth of the cavity to expose a first conductor in the structure and to increase the planar area and depth of a portion of the cavity to expose a second conductor in the structure.
摘要:
A temporary substrate having an array of first solder pads is bonded to the front side of a first substrate by reflowing an array of first solder balls. The first substrate is thinned by removing the back side, and an array of second solder pads is formed on the back side surface of the first substrate. The assembly of the first substrate and the temporary substrate is diced to form a plurality of stacks, each including an assembly of a first semiconductor chip and a handle portion. A second semiconductor chip is bonded to an assembly through an array of the second solder balls. The handle portion is removed from each assembly by reflowing the array of the first solder balls, while the array of the second solder balls does not reflow. The assembly is subsequently mounted on a packaging substrate employing the array of the first solder balls.
摘要:
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.
摘要:
An assembly can include a microelectronic element such as, for example, a semiconductor element having circuits and semiconductor devices fabricated therein, and a plurality of electrical connectors, e.g., solder balls attached to contacts of the microelectronic element. The connectors can be surrounded by first, inner regions 200 of compressible dielectric material and second, outer regions of dielectric material. In one embodiment, an underfill can contact a face of the microelectronic element between respective connectors or second regions. The second regions can provide restraining force, such that during volume expansion of the connectors, the first regions can compress against the restraining force of the second regions.