摘要:
Water based magnetic colloidal fluids, useable as inks, when prepared by coating chemically precipitated magnetite (Fe.sub.3 O.sub.4) with an adsorption site providing coating agent including certain organic anions, such as sulfates, sulfonates or amino carboxilates, and then dispersing the coated product with non-ionic, anionic or cationic surfactants may exhibit selectably cationic, anionic or non-ionic charge responsiveness.
摘要:
The idea of the invention is to coat the free surface of patterned Cu conducting lines in on-chip interconnections (BEOL) wiring by a 1-20 nm thick metal layer prior to deposition of the interlevel dielectric. This coating is sufficiently thin so as to obviate the need for additional planarization by polishing, while providing protection against oxidation and surface, or interface, diffusion of Cu which has been identified by the inventors as the leading contributor to metal line failure by electromigration and thermal stress voiding. Also, the metal layer increases the adhesion strength between the Cu and dielectric so as to further increase lifetime and facilitate process yield. The free surface is a direct result of the CMP (chemical mechanical polishing) in a damascene process or in a dry etching process by which Cu wiring is patterned. It is proposed that the metal capping layer be deposited by a selective process onto the Cu to minimize further processing. We have used electroless metal coatings, such as CoWP, CoSnP and Pd, to illustrate significant reliability benefits, although chemical vapor deposition (CVD) of metals or metal forming compounds can be employed.
摘要:
A method for forming a quaternary alloy film of Co—W—P—Au for use as a diffusion barrier layer on a copper interconnect in a semiconductor structure and devices formed incorporating such film are disclosed. In the method, a substrate that has copper conductive regions on top is first pre-treated by two separate pre-treatment steps. In the first step, the substrate is immersed in a H2SO4 rinsing solution and next in a solution containing palladium ions for a length of time sufficient for the ions to deposit on the surface of the copper conductive regions. The substrate is then immersed in a solution that contains at least 15 gr/l sodium citrate or EDTA for removing excess palladium ions from the surface of the copper conductive regions. After the pre-treated substrate is rinsed in a first rinsing step by distilled water, the substrate is electroless plated a Co—W—P film on the surfaces of the copper conductive regions in a first plating solution that contains cobalt ions, tungstate ions, citrate ions and a reducing agent. After the substrate coated with the Co—W—P film is rinsed in a second rinsing step by distilled water, the substrate is immersed in a second electroless plating solution for depositing a Au layer on top of the Co—W—P film. The present invention novel quaternary alloy film can be used as an effective diffusion barrier layer between a copper interconnect and silicon substrate or SiO2 dielectric layers.
摘要:
A precise volume, precisely registerable carrier is provided for use with injection molding for producing integrated circuit bump contacts in the "flip chip" technology. A hemispherical cavity is produced by etching through and undercutting a registered opening into a transparent carrier. The hemispherical cavity has related specific volume and visible peripheral shape that permits simple optical quality control when the injection molding operation has filled the cavity and simple optical registration for fusing to the pads on the integrated circuit.
摘要:
The invention is the technology of providing a packaging intermediate product that can serve as an interface substrate that is to be positioned between different circuitry types where the dimensions are approaching the sub 100 micrometer range. The invention involves a dielectric wafer structure where the first and second area surfaces of the wafer are separated by a distance that is of the order of the electrical via design length, and an array of spaced vias through the wafer arranged with each via filled with metal surrounded by a chemical metal deposition promoting layer with each via terminating flush with a wafer surface. The wafer structure is achieved by forming an array of blind via openings through the first surface of the dielectric wafer to a depth approaching the via design length, lining the walls for adhesion enhancement, filling the blind via openings completely with a chemically deposited metal, removing material at the first wafer surface thereby planarizing the filled vias, and removing material at the second wafer surface thereby exposing the vias at the design length.
摘要:
A method for forming a quaternary alloy film of Co—W—P—Au for use as a diffusion barrier layer on a copper interconnect in a semiconductor structure and devices formed incorporating such film are disclosed. In the method, a substrate that has copper conductive regions on top is first pre-treated by two separate pre-treatment steps. In the first step, the substrate is immersed in a H2SO4 rinsing solution and next in a solution containing palladium ions for a length of time sufficient for the ions to deposit on the surface of the copper conductive regions. The substrate is then immersed in a solution that contains at least 15 gr/l sodium citrate or EDTA for removing excess palladium ions from the surface of the copper conductive regions. After the pre-treated substrate is rinsed in a first rinsing step by distilled water, the substrate is electroless plated a Co—W—P film on the surfaces of the copper conductive regions in a first plating solution that contains cobalt ions, tungstate ions, citrate ions and a reducing agent. After the substrate coated with the Co—W—P film is rinsed in a second rinsing step by distilled water, the substrate is immersed in a second electroless plating solution for depositing a Au layer on top of the Co—W—P film. The present invention novel quaternary alloy film can be used as an effective diffusion barrier layer between a copper interconnect and silicon substrate or SiO2 dielectric layers.
摘要:
A paste is described for capping electrodes with an oxide free metal layer incorporating a solvent, an unzippable polymer and particles. The electrode could be an interconnect such as a C4 bump. A method for forming a coating and for testing integrated circuit chips is also described. The invention overcomes the problem of interconnecting Pb containing electrodes that are covered with an insulating oxide on integrated circuit chips by coating the Pb containing electrode with Au to provide an oxide free surface for testing and interconnection.
摘要:
A process for electrolessly depositing cobalt-tin alloys with adjustable tin contents from 1 to over 25 atomic percent tin is disclosed. The deposited alloy is useful in the electronics and computer industries for device, chip interconnection and packaging applications. When used for chip interconnection applications, for example, the invention replaces the currently used complicated ball-limiting-metallurgy. The invention may also be used to inhibit hillock formation and electromigration in copper wire structures found in computers and micron dimension electronic devices.
摘要:
The invention is the technology of providing a packaging intermediate product that can serve as an interface substrate that is to be positioned between different circuitry types where the dimensions are approaching the sub 100 micrometer range. The invention involves a dielectric wafer structure where the first and second area surfaces of the wafer are separated by a distance that is of the order of the electrical via design length, and an array of spaced vias through the wafer arranged with each via filled with metal surrounded by a chemical metal deposition promoting layer with each via terminating flush with a wafer surface. The wafer structure is achieved by forming an array of blind via openings through the first surface of the dielectric wafer to a depth approaching the via design length, lining the walls for adhesion enhancement, filling the blind via openings completely with a chemically deposited metal, removing material at the first wafer surface thereby planarizing the filled vias, and removing material at the second wafer surface thereby exposing the vias at the design length.
摘要:
A system for interconnecting a set of device chips by means of an array of microjoints disposed on an interconnect carrier is taught. The carrier is provided with a dense array of microjoint receptacles with an adhesion layer, barrier layer and a noble metal layer; the device wafers are fabricated with an array of microjoining pads comprising an adhesion layer, barrier layer and a fusible solder layer with pads being located at matching locations in reference to the barrier receptacles; said device chips are joined to said carrier through the microjoint arrays resulting in interconnections capable of very high input/output density and inter-chip wiring density.