摘要:
A "planar" type plasma-etching apparatus wherein one electrode is a metallic mesh electrode, while the other electrode is a metallic plate electrode, and wherein a work piece is placed outside the mesh electrode. This apparatus has the advantage that a work piece having a large area can be etched uniformly over its whole surface.
摘要:
A semiconductor device is disclosed, which includes bipolar transistor each having an emitter, base and collector formed inside each protruding portion of a semiconductor substrate, and trenches for device isolation. The bipolar transistor and the trench are spaced apart from each other by a predetermined spacing. According to this arrangement, the width of a base contact becomes uniform and any change of transistor characteristics can be prevented effectively.
摘要:
A semiconductor device manufacturing method is disclosed which can reduce the cost of manufacturing an MAP type semiconductor device. According to this method, a substrate with semiconductor chips mounted at predetermined intervals in a matrix shape on a main surface thereof is clamped between a lower mold and an upper mold of a molding die, an insulating resin is injected through gates into a cavity formed on the main surface side of the substrate, air present within the cavity is allowed to escape from air vents, to form a block molding package which covers the semiconductor chips, thereafter bump electrodes are formed on a back surface of the substrate, and then the block molding package and the substrate are cut longitudinally and transversely to fabricate plural semiconductor devices. The air vents are formed by grooves provided in the substrate.
摘要:
A semiconductor device includes a first insulation film formed on a monocrystalline substrate and having an opening, a monocrystalline semiconductor layer formed so as to protrude into the first insulation film, and a conductive layer formed in contact with the side section of the monocrystalline semiconductor layer and extending over a second insulation film formed on the monocrystalline semiconductor layer.
摘要:
By a solder bump, a CSP is bonded to a first electrode of the module substrate of a multi-chip module. For this solder bump, a solder added with an alkaline earth metal such as Ba, Be, Ca or Mg is used. Accordingly, upon solder reflow, phosphorous (P) reacts with the alkaline earth metal, thereby forming a P compound. Owing to dispersion of this P compound inside of the solder bump, no P concentrated layer is formed on the Ni film, making it possible to prevent peeling of the solder bump from the first electrode upon solder reflow. Thus, the present invention makes it possible to improve the solder bonding property.
摘要:
An electronic device comprising a semiconductor chip which is fixed to the mounting face of a wiring board through an adhesive and in which external terminals are electrically connected with electrode pads of the wiring board through bump electrodes. Recesses are formed in the electrode pads, and in the recesses the electrode pads and the bump electrodes are connected. The electrode pads are formed over the surface of a soft layer, and the recesses are formed by elastic deformation of the electrode pads and the soft layer.
摘要:
An electrically reliable heat radiating package provided with ball grid array (BGA) structure and a method of manufacturing the package are disclosed. In the concrete, a semiconductor chip is mounted on one surface of a ceramic wiring board via a first soldered bump electrode and resin is filled in a gap area between the one surface of the wiring board and the principal surface of the semiconductor chip. A heat diffusing plate formed in larger plane size than that of the semiconductor chip by aluminum nitride is arranged on the rear surface opposite to the principal surface of the semiconductor chip and soldered. Further, a radiating fin made of aluminum is provided on the heat diffusing plate and stuck via silicone rubber in which thermally conductive filler is included. Further, the above first soldered bump electrode and a second soldered bump electrode with a lower melting point than that of solder used for the above soldering are formed on the rear surface of the above ceramic wiring board and the above BGA package provided with heat radiating structure is formed. This BGA package is mounted on a glass epoxy wiring board at low temperature.
摘要:
A method of soldering used in fabricating an electronic circuit device employs an organic material supplied to at least one of the connecting members to be bonded. The connecting members are positioned in an oxidizing atmosphere, and heated in a nonoxidizing atmosphere to remove oxide and/or contamination layers present on the surface of presoldered portions or metallized bonding portions. By this method, fluxless soldering is performed, positional shifts are reduced, and high reliability of the soldering connections with reduction in residues after reflow are obtained.
摘要:
A semiconductor module comprises a substrate, a plurality of semiconductor chips mounted on the substrate, a plurality of heat conduction members mounted on the back surfaces of the plurality of semiconductor chips, respectively, and a cooling jacket, on which the plurality of heat conduction members are bonded with heat conductive bonding agent, sealed with the substrate, wherein, in a surface of each of the plurality of heat conduction members adjacent to the cooling jacket and in a surface of the cooling jacket adjacent to the heat conduction members, around a portion corresponding to the back surface of each of the semiconductor chip is formed a portion which has non-affinity for the heat conductive bonding agent. Further, it is preferred that a reservoir having an affinity for the heat conductive bonding agent and serving to receive an excessive bonding agent is formed around each of the non-affinity portions of the plurality of heat conduction members and the cooling jacket.
摘要:
An anti-reflective coating film is formed on a resist film formed on a substrate having a target pattern formed on its surface, thereby to reduce multiple reflection of light in said resist film. The distortion of the pattern detection signal due to multiple reflection in said resist film is thereby prevented to improve the mask positioning accuracy.