| 摘要 |
PURPOSE:To obtain an anisotropic conducting material characterized by high adhesion and high resolution and make it possible to perform highly reliable packaging, by forming a conductive intermediate layer on the surface of a spherical particle such as a spherical macromolecule, and forming a conductive particle. CONSTITUTION:A spherical core material 21 comprising benzoguanamine resin having a uniform particle diameter is synthesized. A nickel layer is formed as a conductive intermediate layer 22 on the surface of the core material. Finally, an insulating surface layer 23 comprising a thermoplastic resin layer of styrene and butadiene is formed on the surface of the layer 22, and a microcapsule is formed. Thus an anisotropic conducting layer is obtained. The material is mixed with ethanol and the like. Said microcapsule in a paste state is applied on a bonding pad BP1 and its vicinity on a wiring substrate 11 by a screen printing method. Thereafter, the ethanol and the like are evaporated through a pre-baking process. Then, a semiconductor chip 12 provided with a bonding pad BP2 is mounted in a face down attitude. Heating is performed on the side of the semiconductor chip, and pressure is applied. Thus the connection is completed.
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