Abstract:
PROBLEM TO BE SOLVED: To form a metal surface capable of connection which receives conducting wiring, by sticking a thin second metal layer on a first metal layer, and heating the first and the second metal layers up to a specified temperature for a specified time. SOLUTION: A substrate 11 with a circuit is formed of proper dielectric material (organic insulating material like epoxy glass) on which a wiring layer 13 composed of copper or the like is formed. A first metal layer 14 composed of palladium of 5 microinches thick is formed on a wiring layer 13. A second thin metal layer 15 of gold (50-200 Å thick) which is different from the first metal layer 14 is arranged on the first metal layer 14. The first metal layer 14 and the second metal layer 15 which are composed of palladium and gold are heated for one hour, up to 180 deg.C. When heating, hydrogen molecules captured by a palladium layer is energized by heat and discharged in air through a gold layer. A wire 17 of wire bond is connected with the first metal layer 14 through the second thin metal layer 15.
Abstract:
PROBLEM TO BE SOLVED: To provide an electronic structure having a conductive plating layer where adhesion of plating is enhanced. SOLUTION: A substrate having a metal sheet in a dielectric layer is used. The metal sheet contains a metal, e.g. copper. An opening, e.g. a blind via, is made in the substrate by laser drilling passing through a part of the dielectric layer and the metal sheet. Surface (blind surface) beneath the opening includes a metal protrusion formed by laser drilling and the metal protrusion is integrated with the blind surface. The metal protrusion contains the metal of the metal sheet and at least one component from the dielectric layer. Subsequently, the metal protrusion is etched to form a metal interlock structure integral with a part of the blind surface. A conductive metal is stuck into the opening including the metal interlock structure by plating.
Abstract:
PROBLEM TO BE SOLVED: To provide an electronic module having improved adhesion at the interface between a passivation and an underfill of a chip. SOLUTION: The surface of a passivation of a chip is chemically reformed to a sufficient depth so that a set passivation is more reactive. The reformed surface is processed with a polyamide. During reflow of solder joint of an electronic module under heat, the reformed passivation reacts with the polyamine at an amine functional group, After the electronic module is underfilled with the polymer material, the polyamine on the surface of the passivation reacts with the underfill material while the underfill material sets. Since the amine acts as a chemical fixing part for both the reformed passivation and the underfill material, the provided electronic module is less fragile.
Abstract:
PROBLEM TO BE SOLVED: To provide an electronic module having an improved adhesion at the boundary of a passivation with an under-fill of a chip. SOLUTION: This electronic module is obtained by chemically modifying the surface of a passivation 5 until a sufficient depth so as to enrich the reactivity of the cured passivation 5. The modified surface is treated with a polyamine. During a reflow of a soldering of the electronic module by heating, the modified passivation 5 reacts with the polyamine with its amine functional group. After under-filling the electronic module with a polymer material, the polyamine on the surface of the passivation 5 reacts with the under-fill material 15 while the under-fill material 15 is cured. Since the amine acts as a chemical fixing position to both cured passivation 5 and the under-fill material 15, the obtained electronic module is tough.
Abstract:
An electronic module having enhanced adhesion at the chip passivation and underfill interface is disclosed. The surface of the chip passivation is chemically modified to a sufficient depth such that the cured passivation is more reactive. The modified surface is treated with a polyamine preferably having a cyclic amine group extending from a preferably aliphatic backbone. During reflow of the solder joints of the electronic module by heating, the modified passivation reacts with the polyamine at the amine functionality. Following underfill of the electronic module with a polymeric material, preferably an epoxy resin, the polyamine on the surface of the passivation reacts with the underfill material during curing of the underfill material. The resulting electronic module is more robust since the amine acts as a chemical anchoring site for both the modified passivation and the underfill material. A method of assembling an electronic module utilizing the polyamine treatment at the chip and wafer level is also disclosed.
Abstract:
AN ELECTRONIC MODULE HAVING ENHANCED ADHESION AT THE CHIP PASSIVATION AND UNDERFILL INTERFACE IS DISCLOSED. THE SURFACE OF THE CHIP PASSIVATION IS CHEMICALLY MODIFIED TO A SUFFICIENT DEPTH SUCH THAT THE CURED PASSIVATION IS MORE REACTIVE. THE MODIFIED SURFACE IS TREATED WITH A POLYAMINE PREFERABLY HAVING A CYCLIC AMINE EXTENDING FROM A PREFERABLY ALIPHATIC BACKBONE. DURING REFLOW OF THE SOLDER JOINTS OF THE ELECTRONIC MODULE BY HEATING, THE MODIFIED PASSIVATION REACTS WITH THE POLYAMINE AT THE AMINE FUNCTIONALLY. FOLLOWING UNDERFILL OF THE ELECTRONIC MODULE WITH A POLYMERIC MATERIAL, PREFERABLY AN EPOXY RESIN,THE POLYAMINE ON THE SURFACE OF THE PASSIVATION REACTS WITH THE UNDERFILL MATERIAL DURING CURING OF THE UNDERFILL MATERIAL. THE RESULTING ELECTRONIC MODULE IS MORE ROBUST SINCE THE AMINE ACTS AS A CHEMICAL ANCHORING SITE FOR BOTH THE MODIFIED PASSIVATION AND THE UNDERFILL MATERIAL. A METHOD OF ASSEMBLING AN ELECTRONIC MODULE UTILIZING THE POLYAMINE TREATMENT AT THE CHIP AND WAFER LEVEL IS ALSO DISCLOSED.(FIG. 1)
Abstract:
An electronic module having enhanced adhesion at the chip passivation and underfill interface is disclosed. The surface of the chip passivation is chemically modified to a sufficient depth such that the cured passivation is more reactive. The modified surface is treated with a polyamine preferably having a cyclic amine group extending from a preferably aliphatic backbone. During reflow of the solder joints of the electronic module by heating, the modified passivation reacts with the polyamine at the amine functionality. Following underfill of the electronic module with a polymeric material, preferably an epoxy resin, the polyamine on the surface of the passivation reacts with the underfill material during curing of the underfill material. The resulting electronic module is more robust since the amine acts as a chemical anchoring site for both the modified passivation and the underfill material. A method of assembling an electronic module utilizing the polyamine treatment at the chip and wafer level is also disclosed.