摘要:
Methods for die attachment of multichip and single components may involve printing a sintering paste on a substrate or on the back side of a die. Printing may involve stencil printing, screen printing, or a dispensing process. Paste may be printed on the back side of an entire wafer prior to dicing, or on the back side of an individual die. Sintering films may also be fabricated and transferred to a wafer, die or substrate. A post-sintering step may increase throughput.
摘要:
The present invention is related to anisotropic insulated conductive balls for electric connection, methods of their manufacture, and products using them. That is, the present invention is related to anisotropic conductive balls for electric connection comprised of conductive balls and insulation resin layers coating the surfaces of those conductive balls. The functions of the conductive balls are improved as they are coated with a core-shell-structured emulsion-phase or suspension-phase or water-dispersible resin to form insulation resin layers as the shells of the insulation resin layers are coated with resin layers having the water-emission ability. The present invention is also related to the methods of manufacturing such anisotropic conductive balls for electric connection as well as the products using them. Although the surfaces of the anisotropic conductive balls for electric connection of the present invention are coated with single- or multi-layered insulation resin layers, they show superior alive and insulation characteristics as the problems with the conventional anisotropic conductive balls for electric connection coated with a thermoplastic resin or a thermosetting resin are improved.
摘要:
The present invention provides an insulated conductive particle comprises a conductive particle, and insulating fixative particles discontinuously fixated on the surface of the conductive particle for insulation among other adjacent insulated conductive particles, whereby the insulated conductive particle is electrically connected between electrodes by the insulating fixative particles being deviated from its position. The present invention also provides a method for manufacturing the insulated conductive particle, an anisotropic conductive adhesive film containing the insulated conductive particles, and an electrically connected structure using the film.
摘要:
Disclosed is an anisotropic-electroconductive adhesive, which includes an insulating adhesive component containing a radical polymerizable compound and a polymerization initiator; and a plurality of insulating coated electroconductive particles dispersed in the insulating adhesive component, the insulating coated electroconductive particle having a coating layer made of insulating thermoplastic resin on a surface of an electroconductive particle, wherein a softening point of the insulating thermoplastic resin is lower than an exothermic peak temperature of the insulating adhesive component. The anisotropic-electroconductive adhesive enables rapid curing of the insulating adhesive component at a low temperature and is very useful for making a circuit connection structure since it may prevent a short of circuit without connection failure even when the electroconductive particles are condensed.
摘要:
A paste including metal or metal alloy particles (which are preferably silver or silver alloy), a dispersant material, and a binder is used to form an electrical, mechanical or thermal interconnect between a device and a substrate. By using nano scale particles ( i.e., those which are less than 500 nm in size and most preferably less than 100 nm in size), the metal or metal alloy particles can be sintered at a low temperature to form a metal or metal alloy layer which is desired to allow good electrical, thermal and mechanical bonding, yet the metal or metal alloy layer can enable usage at a high temperature such as would be desired for SiC, GaN, or diamond ( e.g., wide bandgap devices). Furthermore, significant application of pressure to form the densified layers is not required, as would be the case with micrometer sized particles. In addition, the binder can be varied so as to insulate the metal particles until a desired sintering temperature is reached; thereby permitting fast and complete sintering to be achieved.
摘要:
Disclosed is an insulated conductive ball for anisotropic conductive connection, a method of preparing the same and a product using the same. The insulated conductive ball includes a conductive ball, and an insulating resin layer coated on a surface of the conductive ball, in which the insulating resin layer is formed of water soluble resin beads of core/shell structure. Therefore, the conductive ball of the current invention can exhibit superior current feed and insulation characteristics, compared to those of conventional insulated conductive balls for anisotropic conductive connection coated with thermoplastic resin or thermosetting resin.
摘要:
First, second, and third packaged semiconductor devices (a wafer-level chip scale package) are described. The first packaged semiconductor device contains no UBM between a chip pad and an RDL pattern. The first device contains only a single non-polymeric insulation layer between the RDL pattern and the solder bump, where the insulation layer does not need high temperature curing processes and so does not induce thermal stresses into the device. Manufacturing costs for the first device are diminished by eliminating the UBM between the chip pad and the RDL pattern. The second packaged semiconductor device (a second wafer-level chip scale package) contains an adhesive film containing conductive particles sandwiched between a chip with Cu-based stud bumps and a substrate containing a bond pad. Some conductive particles are sandwiched between the stud bump and bond pad to create a conductive path. The second device is manufactured without the steps of dispensing solder and reflowing the solder and can optionally eliminate the use of a redistribution trace. Using such a configuration increases the reliability of the second wafer-level chip scale package. The third packaged semiconductor device (a third wafer-level chip scale package) contains a conductive adhesive material as an electrical interconnect route between the semiconductor die and a patterned conductive substrate. The patterned conductive substrate acts not only as a substrate, but also as a redistribution layer that converts the dense pad layout of the die to a larger array configuration of the solder balls in the circuit board. Using the invention allows the formation of a lower priced chip scale package that overcomes the restriction of the die size used in die-sized chip packages and the input-output pattern that can be required by the printed circuit board. Thus, the invention can provide a familiar pitch (i.e., interface) to the printed circuit board for any small die.