WO2008069055A1 - 配線基板およびそれを用いた半導体素子の実装構造体 - Google Patents
配線基板およびそれを用いた半導体素子の実装構造体 Download PDFInfo
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- WO2008069055A1 WO2008069055A1 PCT/JP2007/072874 JP2007072874W WO2008069055A1 WO 2008069055 A1 WO2008069055 A1 WO 2008069055A1 JP 2007072874 W JP2007072874 W JP 2007072874W WO 2008069055 A1 WO2008069055 A1 WO 2008069055A1
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- via conductor
- wiring board
- layer
- adhesive layer
- conductor
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Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/11—Printed elements for providing electric connections to or between printed circuits
- H05K1/115—Via connections; Lands around holes or via connections
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/48—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor
- H01L23/488—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor consisting of soldered or bonded constructions
- H01L23/498—Leads, i.e. metallisations or lead-frames on insulating substrates, e.g. chip carriers
- H01L23/49827—Via connections through the substrates, e.g. pins going through the substrate, coaxial cables
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/10—Bump connectors; Manufacturing methods related thereto
- H01L2224/15—Structure, shape, material or disposition of the bump connectors after the connecting process
- H01L2224/16—Structure, shape, material or disposition of the bump connectors after the connecting process of an individual bump connector
- H01L2224/161—Disposition
- H01L2224/16151—Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
- H01L2224/16221—Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
- H01L2224/16225—Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being non-metallic, e.g. insulating substrate with or without metallisation
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/10—Bump connectors; Manufacturing methods related thereto
- H01L2224/15—Structure, shape, material or disposition of the bump connectors after the connecting process
- H01L2224/16—Structure, shape, material or disposition of the bump connectors after the connecting process of an individual bump connector
- H01L2224/161—Disposition
- H01L2224/16151—Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
- H01L2224/16221—Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
- H01L2224/16225—Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being non-metallic, e.g. insulating substrate with or without metallisation
- H01L2224/16227—Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being non-metallic, e.g. insulating substrate with or without metallisation the bump connector connecting to a bond pad of the item
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/0001—Technical content checked by a classifier
- H01L2924/00014—Technical content checked by a classifier the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/01—Dielectrics
- H05K2201/0183—Dielectric layers
- H05K2201/0195—Dielectric or adhesive layers comprising a plurality of layers, e.g. in a multilayer structure
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/09—Shape and layout
- H05K2201/09209—Shape and layout details of conductors
- H05K2201/095—Conductive through-holes or vias
- H05K2201/09563—Metal filled via
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/09—Shape and layout
- H05K2201/09818—Shape or layout details not covered by a single group of H05K2201/09009 - H05K2201/09809
- H05K2201/09827—Tapered, e.g. tapered hole, via or groove
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/09—Shape and layout
- H05K2201/09818—Shape or layout details not covered by a single group of H05K2201/09009 - H05K2201/09809
- H05K2201/09836—Oblique hole, via or bump
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/09—Shape and layout
- H05K2201/09818—Shape or layout details not covered by a single group of H05K2201/09009 - H05K2201/09809
- H05K2201/09854—Hole or via having special cross-section, e.g. elliptical
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/0011—Working of insulating substrates or insulating layers
- H05K3/0017—Etching of the substrate by chemical or physical means
- H05K3/0026—Etching of the substrate by chemical or physical means by laser ablation
- H05K3/0032—Etching of the substrate by chemical or physical means by laser ablation of organic insulating material
- H05K3/0035—Etching of the substrate by chemical or physical means by laser ablation of organic insulating material of blind holes, i.e. having a metal layer at the bottom
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/38—Improvement of the adhesion between the insulating substrate and the metal
- H05K3/386—Improvement of the adhesion between the insulating substrate and the metal by the use of an organic polymeric bonding layer, e.g. adhesive
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/46—Manufacturing multilayer circuits
- H05K3/4602—Manufacturing multilayer circuits characterized by a special circuit board as base or central core whereon additional circuit layers are built or additional circuit boards are laminated
Definitions
- the present invention relates to a wiring board and a semiconductor element mounting structure using the wiring board.
- a wiring board for example, there is one in which a plurality of insulating layers and a conductor layer are laminated and the conductor layers are connected to each other through via conductors (for example, see Patent Document 1).
- the via conductor in the wiring board a taper having a narrow width from one end to the other end is employed.
- the contact area at the interface between the via conductor and the conductor layer is smaller at the other end than at one end. For this reason, there is a problem that the stress is concentrated on the interface between the other end and the conductor layer, and the via conductor is easily peeled off from the conductor layer.
- the stripping of the via conductor may cause a conduction failure in the wiring board and cause a reduction in the yield of the wiring board.
- Patent Document 1 Japanese Patent Laid-Open No. 8-116174
- An object of the present invention is to provide a highly reliable wiring board and a semiconductor element mounting structure using the same by effectively reducing peeling of via conductors on the wiring board.
- a wiring board is a wiring board including an insulating layer and a via conductor embedded in the insulating layer, wherein the via The conductor is It has a constricted portion that is inclined with respect to a planar direction along the surface of the insulating layer.
- the wiring board according to the second aspect of the present invention includes an insulating layer and a via conductor embedded in the insulating layer, and the via conductor has a surface in the internal direction of the via conductor.
- the section of the via conductor formed by plotting the position of the recess along the circumferential direction of the via conductor is inclined with respect to a plane parallel to the surface of the insulating layer! / The invention's effect
- FIG. 1 is a cross-sectional view of a semiconductor element mounting structure according to an embodiment of the present invention.
- FIG. 2 is an enlarged cross-sectional view showing the periphery of a via conductor in the mounting structure shown in FIG.
- FIG. 3 is a perspective view of a via conductor of the semiconductor element mounting structure shown in FIG. 1.
- FIG. 4 is a cross-sectional view showing the periphery of a through hole in which a via conductor of the semiconductor element mounting structure shown in FIG. 1 is formed, along with the energy distribution when forming the through hole.
- the semiconductor element mounting structure 1 shown in FIG. 1 is used for electronic devices such as various audiovisual devices, home appliances, communication devices, computer devices, and peripheral devices thereof.
- This mounting structure 1 includes a wiring board 2 and a semiconductor element 3 mounted on the wiring board 2.
- the semiconductor element 3 is a base material such as silicon, such as an IC or LSI, and is mounted on the wiring board 2 via bumps 4 such as solder.
- the wiring board 2 is for constructing a transmission path for transmitting an electrical signal.
- the wiring board 2 includes a core board 5 formed in a flat plate shape, and a plurality of conductor layers 6 and a plurality of insulating layers 7 that are alternately stacked on the upper surface 53 and the lower surface 54 of the core substrate 5. It is out.
- the core substrate 5 has insulating properties, and can be formed, for example, by laminating and solidifying a sheet of woven fabric impregnated with a thermosetting resin.
- a thermosetting resin As the woven fabric, a glass cloth in which glass fibers are woven vertically and horizontally can be used.
- the thermosetting resin epoxy resin, bismaleimide triazine resin or cyanate resin can be used.
- the core substrate 5 can also be formed of ceramics. Examples of the ceramic for the core substrate 5 include oxide ceramics such as aluminum oxide sintered body or mullite sintered body, or non-oxide ceramics such as aluminum nitride sintered body or silicon carbide sintered body. Can be used.
- the core substrate 5 has a through hole 50 penetrating in the thickness direction of the core substrate 5.
- a through-hole conductor 51 and an insulator 52 are formed in the through-hole 50.
- the through-hole conductor 51 electrically connects the conductor layers 6 formed on the upper surface 53 and the lower surface 54 of the core substrate 5 described later, and is formed on the inner surface of the through-hole 50 with a conductive material.
- a through-hole conductor 51 is, for example, a copper It can be formed by force S.
- the insulator 52 is for ensuring the flatness of the core substrate 5 and is formed by the force S formed by filling the through hole 50 with an insulating resin after the through hole conductor 51 is formed.
- the plurality of conductor layers 6 function as transmission paths for transmitting electrical signals.
- Each conductor layer 6 has conductivity, and is formed of a metal material such as copper, silver, gold, aluminum, nickel, or chromium, for example.
- the plurality of conductor layers 6 are stacked above and below the core substrate 5 with the insulating layer 7 interposed therebetween, and include the conductor layers 6 formed on the upper surface 53 and the lower surface 54 of the core substrate 5.
- the conductor layer 6 formed on the upper surface 53 and the lower surface 54 of the core substrate 5 is electrically connected via the through-hole conductor 51, and is formed on the upper surface 53 and the lower surface 54 of the core substrate 5 to form a wiring pattern. Is formed.
- the plurality of insulating layers 7 are for ensuring insulation between the conductor layers 6, and include an adhesive layer 70 and a film layer 71.
- the adhesive layer 70 is for adhering the insulating layers 7 to each other and fixing the film layer 71 to the conductor layer 6 and is formed so as to cover the conductor layer 6.
- the film layer 71 is for improving the rigidity of the entire substrate and is formed so as to cover the adhesive layer 70.
- the adhesive layer 70 and the film layer 71 are formed of an insulating material so that, for example, the thickness after drying is 1 m or more and 10 m or less.
- the thickness of the film layer 71 is preferably set to be larger than the thickness of the adhesive layer 70.
- the thickness difference between the film layer 71 and the adhesive layer 70 is 7111 or less. ing.
- the difference in thickness between the film layer 71 and the adhesive layer 70 indicates the difference in thickness between the film layer 71 and the adhesive layer 70 after drying.
- the via conductor 8 is formed when the via conductor 8 is formed using the manufacturing method described later.
- the constricted portion 80 (see FIGS. 2 and 3) of the conductor 8 can be appropriately formed, which can contribute to the improvement of the yield of the wiring board 2.
- the adhesive layer 70 is formed, for example, such that the thermal decomposition temperature is 260 ° C or higher and 320 ° C or lower, and the film layer 71 is, for example, such that the thermal decomposition temperature is 380 ° C or higher, and 520 ° C or lower.
- the difference in thermal decomposition temperature between the adhesive layer 70 and the film layer 71 is, for example, 60 ° C. or more and 2 60 ° C. or less.
- the thermal decomposition temperature refers to a temperature at which a part of the resin disappears due to decomposition, evaporation, sublimation, etc. by applying heat to the resin in a solidified state, and the weight of the resin is reduced by 5%.
- Such an adhesive layer 70 and film layer 71 are, for example, applied to the core substrate 5 or the conductor layer 6 in a state in which the adhesive layer 70 formed of a resin material and the film layer 71 are bonded together. Then, the laminate can be formed by heating and pressurizing the laminate using a hot press apparatus to solidify the resin.
- the film layer 71 is laminated after the resin layer to be the adhesion layer 70 is formed on the core substrate 5 or the conductor layer 6, and the resin is then solidified by heating and pressurizing the laminate. Can also be formed.
- the resin material for the adhesive layer 70 for example, at least one of polyimide resin, acrylic resin, epoxy resin, cyanate resin, urethane resin, silicon resin, and bismaleimide triazine resin is used. Can do.
- the resin material for the film layer 71 for example, at least one of polybenzoxazole resin, polyimide resin, wholly aromatic polyamide resin, wholly aromatic polyester resin, and liquid crystal polymer resin can be used.
- the film layer 71 is preferably formed of a polybenzoxazole resin having good adhesiveness with the adhesive layer 70.
- the adhesive layer 70 a material containing a spherical filler having an insulating property may be used.
- a via conductor 8 to be described later has high adhesion to the adhesive layer 70 in a portion existing in the adhesive layer 70.
- a via conductor 8 that penetrates in the thickness direction is formed in the insulating layer 7.
- the via conductor 8 is for electrically connecting different conductor layers 6 positioned with the insulating layer 7 interposed therebetween, and is buried in the through hole 72 of the insulating layer 7. ing.
- the via conductor 8 has a constricted portion 80 and a convex portion 81, and is formed of a conductive material such as copper, silver, gold, aluminum, nickel, or chromium, for example. Is ing.
- the via conductor 8 is formed in a tapered shape between the end portion 82 and the constricted portion 80, and the width of the via conductor 8 is reduced in the direction toward the constricted portion 80 between the end portion 82 and the constricted portion 80. It is.
- the via conductor 8 is formed in a tapered shape between the convex portion 81 and the constricted portion 80, and the width of the via conductor 8 is reduced in the direction toward the constricted portion 80 between the end portion 82 and the constricted portion 80. It is. That is, the via conductor 8 is a concave curved surface whose surface is recessed toward the inside of the via conductor 8, and the section of the via conductor 8 formed by plotting the position of the recess along the circumferential direction of the via conductor 8 ( The cross section of the constricted portion 80 is inclined with respect to a plane parallel to the surface of the insulating layer 7.
- the via conductor 8 having such a shape, even if a force is applied to the insulating layer 7 in the thickness direction Y, a part of the via conductor 8 is in close contact with the insulating layer 7 and a part of the via conductor 8 is applied. It is possible to reduce the separation of the insulating layer 7 from the conductor layer 6 by applying a drag in the opposite direction to the applied force.
- the constricted portion 80 disperses stress acting on the interfaces 84 and 85 between the end portions 82 and 83 of the conductor layer 6 and the via conductor 8.
- the constricted portion 80 is formed in an annular shape having an elliptical shape as a whole, and is inclined with respect to the plane direction X.
- the inclination angle A of the constricted portion 80 with respect to the plane direction X is, for example, not less than 10 degrees and not more than 20 degrees.
- constricted portion 80 shown in FIG. 3 has an elliptical force
- the via conductor 8 has a shape other than an elliptical shape as long as it is inclined with respect to the plane direction X, such as a polygon. It may be a shape or a shape whose outer periphery meanders.
- the convex portion 81 is for suppressing peeling between the conductor layer 6 and the via conductor 8 when the film layer 71 and the adhesive layer 70 are thermally expanded.
- the protrusion 81 protrudes in the plane direction X and is located on the insulating layer 7 and / or on the adhesive layer 70.
- Heat may be applied to the wiring board 2 when the semiconductor element 2 is connected to the wiring board 2 via the bumps 4 or the like.
- the film layer 71 the atoms constituting the film layer 71 are aligned in the plane direction (horizontal direction) of the film layer 71 from the thickness direction Y of the film layer 71.
- X is firmly arranged.
- Such a film layer 71 has a smaller coefficient of thermal expansion in the plane direction X than in the thickness direction Y of the film layer 71. Therefore, when heat is applied to the wiring board 2, the film layer 71 tries to thermally expand in the thickness direction Y.
- the convex portion 81 of the via conductor 8 is located in the adhesive layer 70, even if a force is applied to the adhesive layer 70 together with the film layer 71 in the thickness direction Y, The convex part 81 works as a stagger. As a result, the presence of the convex portion 81 in the adhesive layer 70 causes the convex portion 81 to resist the applied force. Thereby, peeling between the conductor layer 6 and the via conductor 8 can be suppressed, and the breakage of the wiring board 2 can be reduced.
- the joint surface with the conductor layer is an interface between a metal (for example, copper) constituting the via conductor and a metal (for example, copper) constituting the conductor layer, such as copper.
- the metal crystals are discontinuously formed. Therefore, the via conductor tends to be weaker than usual at the joint surface.
- foreign matter may be mixed into the joint surface, and in this case, the joint strength further decreases. In this way, since the joint surface is a place where the joint strength is weak and foreign substances that cause peeling are easily mixed, the via conductor and the conductor layer are peeled off at the joint surface immediately and particularly at a narrow end. Stress tends to concentrate on the joint surface at the part.
- the end portion and the conductor layer are joined to each other in the conventional via conductor.
- the stress concentrated on the surface can be applied to the constricted portion 80 of the via conductor 8 to disperse the stress.
- the via conductor 8 Since the via conductor 8 is further shaped so that the constricted portion 80 is inclined in the plane direction X, the via conductor 8 has a constricted portion 80 as compared with the case where the constricted portion 80 is formed in the direction along the plane direction X.
- the cross-sectional area (peripheral length) can be increased.
- the stress acting on the via conductor 8 can be further dispersed by the constricted portion 80.
- external force acts on the wiring board 2 as when the wiring board 2 is mounted on the mother board, and stress concentrates on the interface (bonding surface) 84, 85 between the via conductor 8 and the conductor layer 6. Even in this case, the stress can be relieved at the constricted portion 80 of the via conductor 8.
- the occurrence of separation between the via conductor 8 and the conductor layer 6 can be reduced, and the yield of the wiring board 2 and the mounting structure 1 can be improved. wear.
- the core substrate 5 and the film layer 71 are prepared.
- the core substrate 5 is obtained by, for example, hot pressing a sheet obtained by impregnating a glass cloth in which glass fibers are woven vertically and horizontally with a thermosetting resin such as epoxy resin, bismaleimide triazine resin, or cyanate resin together with copper foil. By curing, for example, the thickness dimension is 0.3 mm or more and 1.5 mm or less.
- the core substrate 5 may be formed using low thermal expansion fibers such as wholly aromatic polyamide, wholly aromatic polyester, or liquid crystal polymer in order to reduce the thermal expansion of the wiring substrate 2.
- a through hole 50 is formed in the core substrate 5 so as to penetrate in the thickness direction Y by a conventionally known drilling process, and a through hole conductor 51 is formed in the through hole 50 by electroplating or the like. To do.
- a plurality of through holes 50 are formed, and the diameter is set to, for example, 0.1 mm or more and 1 mm or less.
- the through hole 50 is filled with a resin such as polyimide to form the insulator 52.
- the material constituting the conductor layer 6 is deposited on the upper surface 53 and the lower surface 54 of the core substrate 5 by a conventionally known vapor deposition method, CVD method, sputtering method or the like. Then, a resist is applied to the surface, exposed and developed, and then etched to form the conductor layer 6 on the upper surface 53 and the lower surface 54 of the core substrate 5.
- the insulating layer 7 is formed on the upper surface of the conductor layer 6.
- the insulating layer 7 is formed by forming a resin layer to be the adhesive layer 70 on the surface of the core substrate 5 and then bonding the film layer 71 together to solidify the adhesive layer 70 and the film layer 71.
- the thickness of the insulating layer 7 is, for example, 3 m or more and 15 111 or less.
- the resin layer to be the adhesive layer 70 can be formed by depositing a resin material by, for example, a conventionally known die coating method or spin coating method.
- a resin material for example, a sheet mainly composed of polybenzoxazole resin is used.
- the resin material for forming the adhesive layer 70 for example, a material having a lower thermal decomposition temperature than the film layer 71, for example, polyimide is used.
- the resin material for forming the adhesive layer 70 contains a spherical filler made of an insulating material such as silica! /.
- the insulating layer 7 is irradiated with laser light to form through holes 72.
- the YAG laser device or the CO laser device is used for the laser light, and the insulating layer
- Irradiation is directed toward the surface of the insulating layer 7 from the direction perpendicular to the surface of 7 (the thickness direction Y of the insulating layer 7).
- Nonching is a method in which the peak P of the energy distribution in the laser beam L is decentered from the beam center. That is, as the laser beam L that forms the through-hole 72, the central force of the through-hole 72 where the peak P of the energy P of the laser beam is to be formed by the Gaussian beam G that coincides with the center of the through-hole 72 is formed.
- the offset amount O from the center (beam center) of the through hole 72 of the energy distribution peak P in the laser beam L may be set according to the thickness dimension of the insulating layer 7, for example, the thickness dimension of the insulating layer 7
- the offset amount O is set to 5 ⁇ m or less. This is because when the offset amount O is set to be larger than 5 in, the conductor layer 6 is melted at a high temperature before the through hole 72 having a shape capable of forming the constricted portion 80 is formed, and the conductor layer 6 is melted. This is because holes may be formed.
- the peak P of the energy distribution in the laser beam L is a value obtained by using a CO laser device.
- the irradiation time of the beam B on the insulating layer 7 is set to, for example, 1.0 X 1CT 3 seconds or more and 1.0 seconds or less.
- the insulating layer 7 When the insulating layer 7 is irradiated with such a laser beam L, the energy corresponding to the peak p of the energy distribution is higher than the center of the irradiated laser beam L, and the energy of the laser beam L is most concentrated. Therefore, the component of the insulating layer 7 sublimates around the location. Therefore, a hole is formed in the film layer 71 in a tapered shape that becomes narrower from the upper surface to the lower side (adhesive layer 70).
- the laser light L penetrating the film layer 71 is irradiated to the adhesive layer 70, and the adhesive layer 70 sublimates around the irradiated portion. Since the thermal decomposition temperature of the adhesive layer 70 is lower than that of the film layer 71, it is more easily sublimated than the film layer 71. For this reason, the adhesive layer 70 has a top-to-bottom (guide) Holes are formed in a tapered shape that becomes wider toward the body layer 6).
- the hole formed in the film layer 71 is formed in a tapered shape that becomes narrower toward the adhesive layer 70, whereas the hole formed in the adhesive layer 70 is formed in the conductor layer 6. Since the hole is formed in a tapered shape that becomes wider as it goes, the through hole 72 has a shape having a constricted portion 73 in the vicinity of the interface between the adhesive layer 70 and the film layer 71.
- the adhesive layer 70 is sublimated by the reflected light.
- the conductor layer 6 has a thermal conductivity superior to that of the insulating layer 7, the conductor layer 6 easily releases heat more than the insulating layer 7 .
- the adhesive layer 70 at the interface between the conductor layer 6 and the insulating layer 7 is Difficult to sublime. Therefore, the through hole 72 has a shape having a convex portion 74 slightly above the conductor layer 6.
- the peak P of the energy distribution in the laser beam L is offset from the center, the reflected light from the conductor layer 6 corresponding to the high energy intensity portion of the film layer 71 is not only the adhesive layer 6. Sublimate a part. Therefore, in the through hole 72, the constricted portion 73 is inclined with respect to the planar direction X of the insulating layer 7.
- a trepan process in which irradiation and non-irradiation are repeatedly performed while moving a laser beam may be employed instead of punching.
- the via conductor 8 is formed in the through hole 72.
- the via conductor 8 can be formed, for example, by filling the through hole 72 with a metal such as copper by electroless plating.
- the through-hole 72 has a constricted portion 73 and a convex portion 74, and has a tapered shape in which the space between the upper surface of the insulating layer 7 and the constricted portion 73 becomes narrower toward the constricted portion 73, whereas the constricted portion 73
- the convex portion 74 has a tapered shape that becomes wider as it goes to the convex portion 74. Therefore, the via conductor 8 has a constricted portion 80 and a convex portion 81 as shown in FIGS. 2 and 3 following the shape of the through hole 72.
- the via conductor 8 has a first taper portion in which the width of the via conductor 8 decreases from the upper surface of the insulating layer 7 to the constricted portion 80 between the constricted portions 80. Furthermore, the via conductor 8 has a second taper portion between the constricted portion 80 and the convex portion 81 such that the width of the via conductor 8 increases toward the convex portion 81.
- the via conductor 8 when the via conductor 8 is formed by electroless plating or the like, the via conductor 8 becomes an integrated body in which metal crystals are continuously formed. Therefore, the via conductor 8 is a laminate of multiple metal layers. Thus, the rigidity is excellent as compared with the case where the crystal is discontinuous as in the case where it is formed. As a result, the via conductor 8 can maintain the electrical conductivity of the mounting structure 1 of the wiring board 2 and the semiconductor element 3 that are not easily destroyed by an external load.
- the inner surface of the through hole 72 may be etched using, for example, manganic acid.
- the via conductor 8 formed in the through hole 72 has high adhesion with the inner surface of the through hole 72. As a result, the via conductor 8 can be prevented from peeling from the inner surface of the through hole 72.
- the spherical filler is exposed on the inner surface of the through hole 72 corresponding to the adhesive layer 70, or the spherical layer is exposed.
- the filler is missing and the surface has irregularities.
- the adhesion between the via conductor 8 and the inner surface of the through hole 72 is improved and the via conductor 8 is peeled off, as in the case where the inner surface of the through hole 72 is etched. It can be suppressed.
- the wiring board 2 can be manufactured. Furthermore, the semiconductor element mounting structure 1 can be formed by mounting the semiconductor element 2 on the wiring board 2 via the bumps 3.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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JP2008548234A JPWO2008069055A1 (ja) | 2006-11-28 | 2007-11-27 | 配線基板およびそれを用いた半導体素子の実装構造体 |
US12/516,751 US20100065318A1 (en) | 2006-11-28 | 2007-11-27 | Circuit board and semiconductor element mounted structure using the same |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2006-320029 | 2006-11-28 | ||
JP2006320029 | 2006-11-28 |
Publications (1)
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WO2008069055A1 true WO2008069055A1 (ja) | 2008-06-12 |
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ID=39491958
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PCT/JP2007/072874 WO2008069055A1 (ja) | 2006-11-28 | 2007-11-27 | 配線基板およびそれを用いた半導体素子の実装構造体 |
Country Status (3)
Country | Link |
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US (1) | US20100065318A1 (ja) |
JP (1) | JPWO2008069055A1 (ja) |
WO (1) | WO2008069055A1 (ja) |
Cited By (2)
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JP2009182260A (ja) * | 2008-01-31 | 2009-08-13 | Sanyo Electric Co Ltd | 太陽電池 |
JP2010034324A (ja) * | 2008-07-29 | 2010-02-12 | Kyocera Corp | 配線基板の製造方法 |
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US8759691B2 (en) * | 2010-07-09 | 2014-06-24 | Ibiden Co., Ltd. | Wiring board and method for manufacturing the same |
JP2012039005A (ja) * | 2010-08-10 | 2012-02-23 | Toshiba Corp | 半導体装置およびその製造方法 |
JP2012069926A (ja) * | 2010-08-21 | 2012-04-05 | Ibiden Co Ltd | プリント配線板及びプリント配線板の製造方法 |
JP5864954B2 (ja) * | 2011-08-26 | 2016-02-17 | 新光電気工業株式会社 | 基材 |
KR20130089475A (ko) * | 2012-02-02 | 2013-08-12 | 삼성전자주식회사 | 회로 기판 및 이의 제조 방법과 이를 이용한 반도체 패키지 |
US20140027163A1 (en) * | 2012-07-30 | 2014-01-30 | Samsung Electro-Mechanics Co., Ltd. | Printed circuit board and method for manufacturing the same |
JP2016051870A (ja) * | 2014-09-02 | 2016-04-11 | イビデン株式会社 | パッケージ基板及びパッケージ基板の製造方法 |
KR102346643B1 (ko) * | 2015-06-30 | 2022-01-03 | 쑤저우 레킨 세미컨덕터 컴퍼니 리미티드 | 발광 소자, 발광 소자 제조방법 및 발광 모듈 |
JP6557573B2 (ja) * | 2015-10-19 | 2019-08-07 | 新光電気工業株式会社 | 配線基板及びその製造方法 |
JP6697870B2 (ja) * | 2015-12-08 | 2020-05-27 | 新光電気工業株式会社 | 配線基板及びその製造方法 |
JP2018163901A (ja) * | 2017-03-24 | 2018-10-18 | イビデン株式会社 | プリント配線板 |
JP2020161731A (ja) * | 2019-03-27 | 2020-10-01 | イビデン株式会社 | 配線基板 |
KR102268389B1 (ko) * | 2019-09-11 | 2021-06-23 | 삼성전기주식회사 | 인쇄회로기판 및 이를 포함하는 안테나 모듈 |
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JPWO2008069055A1 (ja) | 2010-03-18 |
US20100065318A1 (en) | 2010-03-18 |
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