WO2005087980A2 - 半導体装置、半導体装置の製造方法および配線基板の製造方法 - Google Patents
半導体装置、半導体装置の製造方法および配線基板の製造方法 Download PDFInfo
- Publication number
- WO2005087980A2 WO2005087980A2 PCT/JP2004/019583 JP2004019583W WO2005087980A2 WO 2005087980 A2 WO2005087980 A2 WO 2005087980A2 JP 2004019583 W JP2004019583 W JP 2004019583W WO 2005087980 A2 WO2005087980 A2 WO 2005087980A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- plating layer
- electroless
- wiring board
- plating
- manufacturing
- Prior art date
Links
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- 238000000034 method Methods 0.000 title claims description 99
- 238000004519 manufacturing process Methods 0.000 title claims description 69
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- 229910000679 solder Inorganic materials 0.000 claims description 242
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 148
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- 239000010931 gold Substances 0.000 claims description 63
- 239000010949 copper Substances 0.000 claims description 58
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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
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/22—Secondary treatment of printed circuits
- H05K3/24—Reinforcing the conductive pattern
- H05K3/244—Finish plating of conductors, especially of copper conductors, e.g. for pads or lands
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
- C23C18/52—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating using reducing agents for coating with metallic material not provided for in a single one of groups C23C18/32 - C23C18/50
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/48—Manufacture or treatment of parts, e.g. containers, prior to assembly of the devices, using processes not provided for in a single one of the subgroups H01L21/06 - H01L21/326
- H01L21/4814—Conductive parts
- H01L21/4846—Leads on or in insulating or insulated substrates, e.g. metallisation
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- 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
- H01L23/49866—Leads, i.e. metallisations or lead-frames on insulating substrates, e.g. chip carriers characterised by the materials
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
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- H01L24/93—Batch processes
- H01L24/95—Batch processes at chip-level, i.e. with connecting carried out on a plurality of singulated devices, i.e. on diced chips
- H01L24/97—Batch processes at chip-level, i.e. with connecting carried out on a plurality of singulated devices, i.e. on diced chips the devices being connected to a common substrate, e.g. interposer, said common substrate being separable into individual assemblies after connecting
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- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
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- H01L2224/26—Layer connectors, e.g. plate connectors, solder or adhesive layers; Manufacturing methods related thereto
- H01L2224/31—Structure, shape, material or disposition of the layer connectors after the connecting process
- H01L2224/32—Structure, shape, material or disposition of the layer connectors after the connecting process of an individual layer connector
- H01L2224/321—Disposition
- H01L2224/32151—Disposition the layer 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
- H01L2224/32221—Disposition the layer 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
- H01L2224/32225—Disposition the layer 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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- 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
- H01L2224/42—Wire connectors; Manufacturing methods related thereto
- H01L2224/44—Structure, shape, material or disposition of the wire connectors prior to the connecting process
- H01L2224/45—Structure, shape, material or disposition of the wire connectors prior to the connecting process of an individual wire connector
- H01L2224/45001—Core members of the connector
- H01L2224/45099—Material
- H01L2224/451—Material with a principal constituent of the material being a metal or a metalloid, e.g. boron (B), silicon (Si), germanium (Ge), arsenic (As), antimony (Sb), tellurium (Te) and polonium (Po), and alloys thereof
- H01L2224/45138—Material with a principal constituent of the material being a metal or a metalloid, e.g. boron (B), silicon (Si), germanium (Ge), arsenic (As), antimony (Sb), tellurium (Te) and polonium (Po), and alloys thereof the principal constituent melting at a temperature of greater than or equal to 950°C and less than 1550°C
- H01L2224/45144—Gold (Au) as principal constituent
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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
- H01L2224/42—Wire connectors; Manufacturing methods related thereto
- H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
- H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
- H01L2224/4805—Shape
- H01L2224/4809—Loop shape
- H01L2224/48091—Arched
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
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- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
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- H01L2224/42—Wire connectors; Manufacturing methods related thereto
- H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
- H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
- H01L2224/481—Disposition
- H01L2224/48151—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
- H01L2224/48221—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
- H01L2224/48225—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
- H01L2224/48227—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 connecting the wire to a bond pad of the item
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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
- H01L2224/73—Means for bonding being of different types provided for in two or more of groups H01L2224/10, H01L2224/18, H01L2224/26, H01L2224/34, H01L2224/42, H01L2224/50, H01L2224/63, H01L2224/71
- H01L2224/732—Location after the connecting process
- H01L2224/73251—Location after the connecting process on different surfaces
- H01L2224/73265—Layer and wire connectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
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- H01L2224/93—Batch processes
- H01L2224/95—Batch processes at chip-level, i.e. with connecting carried out on a plurality of singulated devices, i.e. on diced chips
- H01L2224/97—Batch processes at chip-level, i.e. with connecting carried out on a plurality of singulated devices, i.e. on diced chips the devices being connected to a common substrate, e.g. interposer, said common substrate being separable into individual assemblies after connecting
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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
- H01L23/28—Encapsulations, e.g. encapsulating layers, coatings, e.g. for protection
- H01L23/31—Encapsulations, e.g. encapsulating layers, coatings, e.g. for protection characterised by the arrangement or shape
- H01L23/3107—Encapsulations, e.g. encapsulating layers, coatings, e.g. for protection characterised by the arrangement or shape the device being completely enclosed
- H01L23/3121—Encapsulations, e.g. encapsulating layers, coatings, e.g. for protection characterised by the arrangement or shape the device being completely enclosed a substrate forming part of the encapsulation
- H01L23/3128—Encapsulations, e.g. encapsulating layers, coatings, e.g. for protection characterised by the arrangement or shape the device being completely enclosed a substrate forming part of the encapsulation the substrate having spherical bumps for external connection
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L24/00—Arrangements for connecting or disconnecting semiconductor or solid-state bodies; Methods or apparatus related thereto
- H01L24/01—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
- H01L24/42—Wire connectors; Manufacturing methods related thereto
- H01L24/44—Structure, shape, material or disposition of the wire connectors prior to the connecting process
- H01L24/45—Structure, shape, material or disposition of the wire connectors prior to the connecting process of an individual wire connector
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L24/00—Arrangements for connecting or disconnecting semiconductor or solid-state bodies; Methods or apparatus related thereto
- H01L24/01—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
- H01L24/42—Wire connectors; Manufacturing methods related thereto
- H01L24/47—Structure, shape, material or disposition of the wire connectors after the connecting process
- H01L24/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L24/00—Arrangements for connecting or disconnecting semiconductor or solid-state bodies; Methods or apparatus related thereto
- H01L24/73—Means for bonding being of different types provided for in two or more of groups H01L24/10, H01L24/18, H01L24/26, H01L24/34, H01L24/42, H01L24/50, H01L24/63, H01L24/71
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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
- 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
- H01L2924/10—Details of semiconductor or other solid state devices to be connected
- H01L2924/11—Device type
- H01L2924/14—Integrated circuits
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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
- H01L2924/15—Details of package parts other than the semiconductor or other solid state devices to be connected
- H01L2924/151—Die mounting substrate
- H01L2924/153—Connection portion
- H01L2924/1531—Connection portion the connection portion being formed only on the surface of the substrate opposite to the die mounting surface
- H01L2924/15311—Connection portion the connection portion being formed only on the surface of the substrate opposite to the die mounting surface being a ball array, e.g. BGA
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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
- H01L2924/15—Details of package parts other than the semiconductor or other solid state devices to be connected
- H01L2924/181—Encapsulation
Definitions
- the present invention relates to a semiconductor device, a method of manufacturing a semiconductor device, and a method of manufacturing a wiring board.
- the present invention relates to a semiconductor device, a semiconductor device manufacturing technique, and a wiring board manufacturing technique, and more particularly, to improving the strength of solder connection of a wiring board having terminals for solder connection and a semiconductor device using the same.
- a semiconductor device manufacturing technique e.g., a semiconductor device manufacturing technique
- a wiring board manufacturing technique e.g., a semiconductor device manufacturing technique
- improving the strength of solder connection of a wiring board having terminals for solder connection and a semiconductor device using the same e.g., a semiconductor device manufacturing technique, and more particularly, to improving the strength of solder connection of a wiring board having terminals for solder connection and a semiconductor device using the same.
- a semiconductor chip is mounted on a wiring board and connected with bonding wires, a sealing resin is formed so as to cover the semiconductor chip and the bonding wires, and a solder ball is connected to a land on the lower surface of the wiring board.
- a semiconductor device in the form of a BGA package is manufactured.
- the land portion for connecting the solder ball of the wiring board is made of, for example, a copper film (Cu pad) whose surface is plated.
- Patent Document 1 Japanese Patent Application Laid-Open No. 10-163404 discloses that a P-containing Ni plating layer is formed on a Cu pad surface of a BGA input / output terminal by an electroless plating method, and then the electroless plating is performed. A technique is described in which an Au plating layer is formed by an attaching method and a solder ball is mounted on the Cu pad. Also, after forming a P-containing Ni plating layer on the Cu pad surface by the electroless plating method, an Au plating layer is further formed by the electroless plating method. When Au is connected, the Au in the Au plating layer diffuses into the solder ball, and the P-containing Ni also forms Sn and Ni-Sn compounds in the solder ball. It is described that the surface concentration of P contained becomes abnormally high, and that the P-concentrated layer with high P concentration reduces the bonding strength between solder balls and Cu pads. Patent Document 1: Japanese Unexamined Patent Publication No. 10-163404
- connection strength of a solder ball when a solder ball is connected to a land (Cu pad) having an electroless plating layer formed on the surface it was found that P containing P formed on the land (Cu pad) was used. Tiny particles generated at the interface between the Ni plating layer and the Sn—Ni alloy (i-conjugate) layer formed when Sn of the solder ball and Ni of the P-containing Ni plating layer react when the solder ball is connected
- the voids reduced the connection strength of the solder balls. When such minute voids are formed, the strength of the solder connection at the lands decreases, and for example, the connection strength of the solder balls in a semiconductor device such as a BGA package to which the solder balls are connected decreases. May reduce reliability.
- An object of the present invention is to provide a technique capable of improving the strength of a solder connection.
- Another object of the present invention is to provide a technique capable of improving the reliability of a semiconductor device.
- the present invention provides an electroless nickel (Ni) plating layer containing phosphorus (P) formed on a plurality of terminals for solder connection of a wiring board, and another electroless plating layer formed thereon. in forming, in which the elution of nickel (Ni) to the electroless nickel (Ni) plating layer forces plating solution containing phosphorus (P) of the base to 5 X 10- 6 kgZm 2 below.
- a plurality of solder balls are connected to a plurality of terminals of a wiring board of a semiconductor device, and the plurality of terminals are conductors mainly composed of copper formed on a main surface of the wiring board.
- an electroless nickel (Ni) plating layer containing phosphorus (P) formed on the conductor layer, and the electroless nickel (Ni) plating layer containing phosphorus (P) and the solder ball
- An alloy layer containing tin (Sn) and nickel (Ni) is formed between them, and voids of lOnm or more are formed at the interface between the alloy layer and the electroless nickel (Ni) plating layer containing phosphorus (P). It is formed!
- the reliability of the semiconductor device can be improved.
- FIG. 1 is a side view of a semiconductor device according to an embodiment of the present invention.
- FIG. 2 is a sectional view of the semiconductor device of FIG. 1.
- FIG. 3 is a sectional view of a principal part of the semiconductor device of FIG. 1.
- FIG. 4 is a manufacturing process flow chart showing manufacturing steps of a semiconductor device according to an embodiment of the present invention.
- FIG. 5 is an overall plan view of a wiring board used for manufacturing a semiconductor device.
- FIG. 6 is a plan view of one substrate region of a wiring substrate and a peripheral region thereof.
- FIG. 7 is a cross-sectional view of a semiconductor device according to an embodiment of the present invention during a manufacturing step.
- FIG. 8 is a cross-sectional view of the semiconductor device during a manufacturing step following that of FIG. 7;
- FIG. 9 is a cross-sectional view of the semiconductor device during a manufacturing step following that of FIG. 8;
- FIG. 10 is a sectional view of the semiconductor device during a manufacturing step following that of FIG. 9;
- FIG. 11 is a sectional view of the semiconductor device during a manufacturing step following that of FIG. 10;
- FIG. 12 is a cross-sectional view of the semiconductor device during a manufacturing step following that of FIG. 11;
- FIG. 13 is a side view showing a state where the semiconductor device is mounted on a mounting board.
- FIG. 14 is a sectional view of a main part in FIG. 13.
- FIG. 15 is an overall plan view showing a wiring board of a comparative example in which wiring for plating is formed.
- FIG. 16 is a plan view of one substrate region and a peripheral region of a wiring substrate of a comparative example on which wiring for plating is formed.
- FIG. 17 is a side view of a semiconductor device of a comparative example manufactured using a wiring board on which wiring for plating is formed.
- FIG. 18 is a process flow chart showing a plating process for a land portion.
- FIG. 19 is a cross-sectional view of a main part of the land in a state where the surface of the land is plated.
- FIG. 20 is a cross-sectional view of a main portion of the land portion after a solder ball has been connected to the land portion.
- FIG. 21 is a partially enlarged cross-sectional view showing a comparative example in which voids were formed near the interface between the phosphorus-enriched layer and the alloy layer of the electroless Ni—P plating layer.
- FIG. 22 is a cross-sectional view schematically showing a state in which voids have occurred near an interface between an electroless Ni—P plating layer and an electroless plating layer thereover.
- FIG. 23 is an explanatory diagram of a void generation mechanism.
- FIG. 24 is a table showing natural electrode potentials of various metals.
- FIG. 25 is a partially enlarged cross-sectional view showing a region near an interface between a phosphorus-enriched layer of an electroless Ni—P plating layer and an alloy layer.
- FIG. 26 is an explanatory diagram of a shear strength test.
- FIG. 27 is a graph showing the results of a shear strength test.
- FIG. 28 is a table showing the presence or absence of voids in various samples subjected to the shear strength test.
- FIG. 29 is an explanatory diagram of a tensile strength test.
- FIG. 30 is a graph showing the results of a tensile strength test.
- Fig. 33 is a graph showing a measurement example of the magnitude of the impact applied in the impact bending test.
- FIG. 34 is a table showing the results of an impact bending test.
- FIG. 36 is a graph showing an example of analysis of a plating layer.
- FIG. 37 is a graph plotting the content of S in an electroless Ni—P plating layer and the amount of Ni eluted into an electroless Pd plating solution in an electroless Pd plating step.
- FIG. 38 is a graph showing the results of evaluating the solder wettability of the lands subjected to plating.
- FIG. 39 is a graph showing the result of examining the connection strength of bonding wires to lands on a wiring board.
- hatching may be omitted even in a cross-sectional view so as to make the drawings easy to see. Also, hatching may be used even in a plan view so as to make the drawings easy to see.
- FIG. 1 is a side view of a semiconductor device according to one embodiment of the present invention
- FIG. 2 is a cross-sectional view (side cross-sectional view), and FIG. ).
- the semiconductor device 1 of the present embodiment is a surface-mounted semiconductor package, for example, a BGA (Ball Grid Array Package), a MAP (Mold Array Package), an LGA (Land Grid Array Package), or a CSP (Chip). It is a semiconductor device such as a (Size Package) type.
- a semiconductor device 1 of the present embodiment shown in FIGS. 1 and 3 includes a wiring board 2, a semiconductor chip (semiconductor element) 3 mounted on a main surface (upper surface) 2a of the wiring board 2, and Bonding wires 5 for electrically connecting between the electrodes (bonding pads) 3a of the semiconductor chip 3 and the conductive lands (terminals, electrodes, pads, wiring, conductors) 4a of the main surface 2a of the wiring board 2; Formed on the main surface 2a of the wiring board 2 so as to cover the semiconductor chip 3 and the bonding wires 5.
- FIG. 3 shows a partially enlarged cross-sectional view near the connection between the wiring board 2 and the solder ball 7.
- the wiring board (package wiring board, knocking board) 2 is, for example, a resin material (eg, glass epoxy resin), an organic polymer material, or a ceramic material (eg, alumina (acid Insulating layers (base materials)
- Multilayer Layer and a plurality of conductor layers (wiring layer, conductor pattern layer) are laminated and integrated to form a multilayer structure, which is a so-called multilayer substrate (multilayer wiring substrate).
- a material for forming the conductor layer of the wiring board 2 a material having good conductivity such as copper can be used.
- the main surface 2 a of the wiring board 2 (the main surface 2 a on the side on which the semiconductor chip 3 is mounted) is provided with a conductive land portion for electrically connecting to the electrode 3 a of the semiconductor chip 3 via the bonding wire 5.
- 4a are formed in plurality.
- On the main surface 2b of the wiring board 2 (the main surface 2b on the connection side of the solder ball 7, here the main surface 2b opposite to the main surface 2a), there are multiple conductive lands 4b for connecting the solder ball 7. Numbers are formed.
- the land portion 4a of the main surface 2a of the wiring board 2 and the land portion 4b of the main surface 2b are not illustrated in the wiring board 2 (the insulating layer thereof)!
- wiring board 2 a multilayer board in which a plurality of insulating layers (base layers) and a plurality of conductor (wiring) layers are laminated as described above may be used, or one insulating layer (base layer) may be used.
- a substrate in which a conductor layer is formed on the front surface and the back surface may be used.
- a conductor layer made of a conductor material containing copper as a main component such as a copper film (copper foil) is formed on the main surface 2 b of the wiring board 2.
- a solder resist layer 12 having an opening 12a is formed on main surface 2b of wiring board 2 so as to cover conductor layer 11.
- a plating process is performed on the surface of the conductor layer 11 exposed from the opening 12a of the solder resist layer 12, so that a plating layer 13 is formed. This plating process will be described later in more detail.
- the conductor layer 11 exposed from the opening 12a of the solder resist layer 12 and the plating layer 13 on the surface form a land 4b for connecting the solder balls 7 of the wiring board 2.
- the thickness of the conductor layer (copper film) 11 constituting the land portion 4b is, for example, 10-40. m.
- the land portions 4b are terminals for solder connection of the wiring board 2 (terminals for connecting the solder balls 7), and the solder balls 7 are connected to each land portion 4b.
- the solder balls 7 can function as external connection terminals of the semiconductor device i.
- the solder ball 7 also has a Pb (lead) -free soldering force, for example.
- a conductor layer (conductor film, copper film) 14 for forming the wiring land portion 4a is formed of the same material as the conductor layer 11.
- the conductor layer 14 exposed from the solder resist layer 12 on the main surface 2a of the wiring board 2 forms a land portion 4a for wire bonding.
- the plating process is also performed on the surface of the land portion 4a to form a plating layer.
- the semiconductor chip 3 is formed, for example, by forming various semiconductor elements or semiconductor integrated circuits on a powerful semiconductor substrate (semiconductor wafer) such as single crystal silicon, and then grinding the back surface of the semiconductor substrate as necessary. After that, the semiconductor substrate is separated into the semiconductor chips 3 by dicing or the like.
- the semiconductor chip 3 is face-up bonded on the main surface 2a of the wiring board 2. For this reason, the semiconductor chip 3 is mounted on the main surface 2a of the wiring board 2 so that its front surface (the surface on the semiconductor element formation side) faces upward, and the back surface of the semiconductor chip 3 (the surface on the semiconductor element formation side). (The surface on the opposite side to the above) is bonded (bonded) to the wiring board 2 via a bonding material (die bonding material, adhesive material) 15.
- a bonding material die bonding material, adhesive material
- the electrode 3a is electrically connected to a semiconductor element or a semiconductor integrated circuit formed on the semiconductor chip 3.
- the electrodes 3a of the semiconductor chip 3 are electrically connected to the lands 4a of the main surface 2a of the wiring board 2 via bonding wires 5, respectively.
- the bonding wire 5 also serves as a thin metal wire such as a gold (Au) wire.
- a sealing resin 6 is formed on the wiring board 2 so as to cover the semiconductor chip 3 and the bonding wires 5.
- the sealing resin 6 is made of a resin material such as a thermosetting resin material, for example, and can also contain a filler and the like.
- the sealing resin 6 can be formed using an epoxy resin containing a filler. The semiconductor chip 3 and the bonding wire 5 are sealed and protected by the sealing resin 6.
- FIG. 4 is a manufacturing process flow chart showing manufacturing steps of the semiconductor device of the present embodiment.
- Figure 5 shows the actual FIG. 6 is an overall plan view of a wiring substrate 21 used for manufacturing the semiconductor device of the embodiment, and FIG. 6 is a plan view of one substrate region 21c of the wiring substrate 21 and a peripheral region thereof.
- 7 to 12 are cross-sectional views (main part cross-sectional views) of the semiconductor device of the present embodiment during manufacturing steps.
- FIG. 5 shows the main surface 21b (corresponding to the main surface 2b) on the side to which the solder ball 7 is connected
- FIG. 6 shows the main surface on the opposite side to FIG. 5, that is, the semiconductor chip 3 is mounted.
- the main surface 2 la (corresponding to the main surface 2a) on the side to be moved is shown.
- 7 to 11 show cross sections corresponding to one substrate region 21c
- FIG. 12 shows a semiconductor device 1 manufactured from one substrate region 21c.
- a wiring board (wiring board for package, package board, motherboard of wiring board) 21 is prepared (Step S1).
- the wiring board 21 is a multiple wiring board (multiple package board, multi-piece board) formed by connecting a plurality of board areas (wiring board, unit area, unit wiring board area) 21c. This is cut in a cutting step of the wiring board 21 described later to be separated into individual board areas 21c. Each of the separated substrate regions 21c corresponds to the wiring substrate 2. Each substrate region 21c has the same configuration, and one semiconductor device is manufactured from each substrate region 21c.A plurality of substrate regions 21c are regularly arranged in the vertical and horizontal directions of FIG. The structure is arranged at
- Such a wiring board 21 is, for example, a multilayer board (multilayer wiring board) in which an insulating layer (base layer) and a conductor layer (wiring layer) are laminated and integrated as in the wiring board 2 described above. It can be formed (manufactured) using various methods.
- the conductor layers disposed on both sides of the core material are patterned by etching or the like.
- etching or the like a conductive metal material such as copper foil is attached to both sides of a sheet, for example, a composite material of resin and glass woven fabric
- the through hole is formed by drilling a through hole in the core material using a drill or laser, and then plating with a highly conductive metal material such as gold or copper.
- a build-up material (a conductive metal material such as copper foil is attached to one side of a sheet such as a resin and a composite material such as a glass woven fabric or an inorganic filler) is placed on both sides of the core material.
- the layers are laminated by crimping. After crimping, build-up material on one side
- the arranged conductor layers are patterned by etching or the like, and through holes are formed as necessary.
- the method of forming the through holes is basically the same as that of the core material.
- the wiring board 21 can be manufactured by using various methods other than the build-up method, such as a printing method and a sheet laminating method, and is not limited to the above manufacturing method.
- a solder resist layer is formed on one or both main surfaces of the wiring board 21.
- a solder resist layer having a portion (corresponding to the opening 12a in FIG. 3) (corresponding to the solder resist layer 12 in FIG. 3) is formed on the main surface 21b of the wiring board 21.
- the main surface 21a (corresponding to the main surface 2a) of the wiring board 21 prepared in this manner on the semiconductor chip 3 mounting side is provided on each of the substrate regions 21c with a plurality of lands 4a for bonding wire 5 connection.
- a plurality of lands 4a for bonding wire 5 connection are formed (exposed), and the main surface 21b (corresponding to the main surface 2b), which is the main surface opposite to the main surface 21a and is connected to the solder ball 7 of the wiring board 21, is connected to the solder ball 7 in each substrate region 21c.
- a plurality of lands 4b for connection of the ball 7 are formed and exposed (exposed) and arranged side by side.
- each substrate region 21c of the wiring board 21 the land portions 4a and the land portions 4b are not shown in the drawing (formed on the insulating layer) of the wiring board 21, and the through holes (conductors in the through holes) and the wiring board 21 are not shown. Are electrically connected via a wiring layer (not shown) formed on the main surface or inside thereof.
- plating is performed on main surfaces 21a and 21b of wiring board 21. That is, the land portions 4a and 4b exposed on the main surfaces 21a and 21b of the wiring board 21 mainly include copper such as a copper film (copper foil) provided on the main surfaces 21a and 21b of the wiring board 21.
- the surface of the copper lands 4a and 4b is plated (step S2).
- an electroless plating method is used for this plating treatment.
- electroless Ni (nickel) plating layer containing P (phosphorus), electroless Pd (palladium) plating layer and electroless Au (gold) are placed on copper lands 4a and 4b.
- the plating layer is formed in order.
- the plating process in step S2 will be described in more detail later. To do.
- the wiring board 21 is prepared as described above, and plating (electroless plating) is performed on the surfaces of the lands 4a and 4b, so that the wiring used in the present embodiment as shown in FIG. Substrate 21 is obtained. Then, as shown in FIG. 8, the semiconductor chip 3 is mounted on each substrate region 21c of the wiring substrate 21 via the bonding material 15 (Step S3). At this time, face-up bonding is performed so that the back surface of the semiconductor chip 3 is on the main surface 21a side of the wiring board 21.
- a wire bonding step is performed to electrically connect the semiconductor chip 3 and the wiring board 2 (Step S4). That is, the electrode 3 a on the surface of the semiconductor chip 3 and the land 4 a on the main surface 21 a of the wiring board 21 are electrically connected via the bonding wire 5.
- a molding step (for example, a transfer molding step) is performed to form a sealing resin 6 on the wiring board 21 so as to cover the semiconductor chip 3 and the bonding wires 5.
- a resin material such as a thermosetting resin material can be used.
- an epoxy resin containing a filler or the like is used to form the sealing resin 6. can do.
- the solder balls 7 are formed (connected) on the main surface 21b of the wiring board 21 (step S6).
- step S6 solder balls are mounted on the lands 4b provided on the main surface 21b of the wiring board 21, and reflow processing (heat treatment) is performed to perform the reflow processing (heat treatment).
- reflow processing heat treatment
- a solder ball 7 connected to the land portion 4b of 2 lb is formed.
- the wiring substrate 21 (or the wiring substrate 21 and the sealing resin 6) is placed at a predetermined position (a die sinter line between the substrate regions 21c) using a dicer (not shown) or the like. ), And cut into individual pieces to separate each semiconductor device 1 (step S7). Thereby, the individualized semiconductor device 1 is obtained (manufactured).
- the manufactured semiconductor device 1 can be mounted (mounted) on a mounting board or the like.
- FIG. 13 is a side view showing a state in which the semiconductor device 1 is mounted on a mounting board (mounting board, wiring board, external board, motherboard) 31.
- FIG. (Enlarged sectional view).
- FIG. 14 shows the vicinity of the connection between the solder ball 7 of the semiconductor device 1 and the mounting board 31. A partial enlarged sectional view of the side is shown.
- the mounting substrate 31 is a wiring substrate for mounting (soldering) the semiconductor device 1 in the form of a semiconductor package, and has a conductive land portion (terminal) on the main surface 31a on which the semiconductor device 1 is mounted.
- Electrodes, wiring, conductors) 32 are formed so as to be exposed from the solder resist layer 33 on the main surface 31a of the mounting board 31.
- the solder balls 7 of the semiconductor device 1 are connected to the lands 32. You. For example, by mounting the semiconductor device 1 on the main surface 31a of the mounting substrate 31 and performing a reflow process (heat treatment), the solder balls 7 of the semiconductor device 1 can be connected to the land portions 32 of the mounting substrate 31.
- the lands 32 of the mounting board 31 also have a conductor layer (conductor film) force mainly composed of copper such as a copper film (copper foil), and the surface of the copper lands 32 is subjected to a plating process.
- a plating layer 34 is formed, and the solder ball 7 of the semiconductor device 1 is connected to the plated land portion 32.
- the plating process on the surface of the land portion 32 which is a terminal for solder connection of the mounting board 31, is performed on the land portion of the solder connection (for solder ball 7 connection) of the wiring board 21 (wiring board 2). It is preferable to perform the same plating treatment as the plating treatment of the surface of 4b (that is, the plating treatment in step S2).
- step S2 the process of attaching wiring substrate 21 (wiring substrate 2) to lands 4a and 4b in the manufacturing process of the semiconductor device of the present embodiment, that is, the attaching process of step S2 will be described in more detail. I do.
- the surface of the copper land portion 4b for the solder connection (for the solder ball 7 connection) of the wiring board 21 (wiring board 2) is subjected to an attaching process, and the solder ball 7 is connected to the plated land portion 4b.
- the plating process on the lands 4a and 4b of the wiring board 21 (wiring board 2) is performed using an electroless plating method.
- FIG. 15 is an overall plan view showing a wiring board 41 of a comparative example in which a plating wiring 42 for plating the surfaces of the lands 4a and 4b using the electrolytic plating method is formed.
- FIG. 9 is a plan view of one substrate region 41c (corresponding to the substrate region 21c) of the wiring substrate 41 and a peripheral region thereof.
- the wiring board 41 forms the wiring 42 for plating. Except for this, it has substantially the same configuration as the wiring board 21 described above.
- FIG. 15 corresponds to FIG. 5 described above
- FIG. 16 corresponds to FIG. In FIGS. 15 and 16, some of the plating wirings 42 are not shown for easy understanding.
- FIG. 17 is a side view of a semiconductor device 43 of a comparative example manufactured using a wiring board 41 on which a wiring 42 for plating is formed.
- a semiconductor device 43 in the form of a BGA package manufactured using a wiring board 41 for MAP the semiconductor chip 3 is mounted in each unit area (substrate area 41c) of the wiring board 41, and the entire body is molded with a resin ( The semiconductor device 43 is sealed with a sealing resin 6), cut by a dicer and separated into individual semiconductor devices 43.
- the copper of the plating wiring 42 is exposed on the side surface of the wiring 42).
- the distance between the copper (the wiring 42 for plating) exposed on the side surface of the wiring board 44 of the semiconductor device 43 is small, a short circuit may occur due to migration or the like. Further, there is a possibility that the semiconductor device 43 may malfunction due to the noise picked up by the wiring 42 for plating.
- the wiring 42 for plating is used, the electrical inspection of the wiring board 41 in the substrate state cannot be performed, and a defect may be found after the semiconductor device 43 is manufactured, which may lower the manufacturing yield of the semiconductor device. is there.
- the land portions 4a, 4b of the main surfaces 21a, 21b (main surfaces 2a, 2b) of the wiring board 21 (wiring board 2) are formed by using the electroless plating method. Plating is applied to the surface. For this reason, it is not necessary to form wiring for plating on the wiring board 21 (wiring board 2). This makes it possible to reduce the pitch between the lands 4a and 4b and the solder balls 7, which is advantageous for miniaturization and increase in the number of terminals of the semiconductor device.
- wiring for plating is not required on the wiring board 21, when the wiring board 21 is cut to manufacture the semiconductor device 1, the wiring for plating is formed on the side surface of the wiring board 2 of the semiconductor device 1 which has been cut into pieces.
- the semiconductor device 1 can be manufactured using the wiring board 21 selected as a non-defective product. Therefore, the production yield of the semiconductor device can be improved.
- FIG. 18 is a process flow diagram showing a plating process (ie, a plating process in step S2) on lands 4a and 4b of wiring substrate 21 (wiring substrate 2) in the present embodiment.
- Fig. 19 is a cross-sectional view of the main part of the land portion 4b in a state where the surface of the land portion 4b for solder connection is plated (before the solder ball 7 is connected to the land portion 4b) (partly enlarged cross-section).
- FIG. 20 is a sectional view (partially enlarged sectional view) of a main part of the land 4b after the solder ball 7 is connected to the land 4b.
- FIG. 19 is a cross-sectional view of the main part of the land portion 4b in a state where the surface of the land portion 4b for solder connection is plated (before the solder ball 7 is connected to the land portion 4b) (partly enlarged cross-section).
- FIG. 20 is a sectional view (partially enlarged sectional view) of
- FIG. 20 corresponds to the cross-sectional view of the same region as FIG. 19, and schematically shows a state in which the solder ball 7 is connected to the land portion 4b having the plating layer formed on the surface as shown in FIG.
- step S2 The plating process (step S2) for the land portion 4b for solder connection is performed as follows.
- nickel (Ni) plating (phosphorus-containing electrolytic nickel plating) is performed using phosphorus (P) as a catalyst, using an electroless plating method (step S2a).
- the electroless nickel plating layer (Ni) containing phosphorus is formed on the land 4b (ie, on the conductor layer (copper film) 11) exposed from the opening 12a of the solder resist layer 12.
- Electroless Ni-P plating layer (electroless plating layer containing Ni (nickel) and P (phosphorus), electroless plating layer consisting of alloy of Ni (nickel) and P (phosphorus)) Film, plating film) 13a is formed.
- the thickness of the electroless Ni-P plating layer 13a is, for example, about 3 to 15 m.
- the electroless nickel plating treatment in step S2a may be performed using a plating solution using, for example, nickel sulfate, sodium hypophosphite, oxycarboxylic acid, sulfuric acid, sodium hydroxide, and an inorganic sulfur compound. it can.
- a plating solution that uses a nickel compound such as nickel sulfate and a phosphorus-based reducing agent such as sodium hypophosphite
- the electroless nickel (Ni) plating layer containing phosphorus (P) is used.
- the plating layer 13a can be formed.
- step S 2b palladium (Pd) plating is performed using an electroless plating method.
- an electroless Pd (palladium) plating layer (an electroless plating layer having a Pd (nodium) force, a plating film, a plating film) 13b is formed on the electroless Ni—P plating layer 13a.
- the thickness of the electroless Pd plating layer 13b is, for example, about 0.1 to 0.6 m.
- the electroless palladium plating treatment in step S2b uses, for example, a palladium compound, ammonia, an amyloid compound, an aliphatic monocarboxylic acid, an aliphatic dicarboxylic acid, an aliphatic polycarbonate, and an aqueous solution thereof. It can be performed using a plating solution. By using the plating solution using the noradium conjugate, the electroless Pd plating layer 13b can be formed.
- the step of forming the next electroless plating layer on electroless Ni—P plating layer 13a (ie, P-containing electroless Ni plating layer) (here, electroless Pd in step S2b)
- the Ni (nickel) plating liquid of the base electroless Ni—P plating layer 13a electroless plating layer on the electroless Ni—P plating layer 13a
- the amount (elution amount) eluted into the plating solution for forming the electroless Pd plating layer 13b) is 5 X 10 " 6 kg / m 2 (that is, 5 ⁇ g / m 2 )
- the amount of Ni (nickel) eluted from the electroless Ni—P plating layer 13a into the plating solution (here, the electroless palladium plating solution) depends on the plating solution (here, the electroless plating solution).
- the weight of Ni (nickel) dissolved in the palladium plating solution) is added to the plating area (here, That corresponds to the value divided by the Pd area of electroless Ni- P plating layer 13a of the base plating layer 13b is formed).
- a gold (Au) plating process is performed using an electroless plating method (step S2c).
- an electroless Au (gold) plating layer (a plating layer made of Au (gold), a plating film, a plating film) 13c is formed on the electroless Pd plating layer 13b.
- the thickness of the electroless Au plating layer 13c is, for example, about 0.05 to 1 m.
- the electroless plating process in step S2c can be performed by, for example, an electroless flash plating process performed first and an electroless reduced plating process thereafter.
- the electroless flash plating process that is performed first is, for example, a water-soluble polyaminopolycarboxylic acid and a water-soluble amine using potassium cyanide as a salt. It can be performed using derivatives and plating solutions using PH adjusters, etc. .
- the electroless reduction plating performed later includes, for example, a water-soluble gold sulfite compound, a water-soluble polyaminopolycarboxylic acid, a salt thereof, a water-soluble amine, a derivative thereof, and a zinc oxide.
- the plating can be carried out using a plating solution using a sulfate, a sulfite, a hydrazine conjugate, a benzotriazole-based compound, or the like.
- step S2a-S2c the land portion 4b (the conductor layer 11 exposed from the opening 12a of the solder resist layer 12), which is a terminal for solder connection, is subjected to electroless plating. Then, an electroless Ni—P plating layer 13a, an electroless Pd plating layer 13b, and an electroless Au plating layer 13c are formed on the surface.
- the terminals (land portions 4b) for the solder connection (for connecting the solder balls 7) of the wiring board 21 (wiring board 2) are connected to the solder resist layer 12
- the solder ball 7 is connected to the land portion 4b plated in this manner in the solder ball 7 forming step of step S6 of the semiconductor device manufacturing process.
- the surface of the land portion 4a of the wiring board 21, which is a terminal for connecting the bonding wire 5, be subjected to the same electroless plating as in the steps S2a, S2b, and S2c. .
- an electroless plating layer similar to the electroless NiP plating layer 13a, the electroless Pd plating layer 13b, and the electroless Au plating layer 13c is also formed on the surface of the land portion 4a of the main surface 21a of the wiring board 21. Is done.
- the same plating is applied to the land 4a (terminal for wire bonding) of the main surface 21a of the wiring board 21 and the land 4b (terminal for solder connection) of the main surface 21b of the wiring board 21.
- the land portions 4a of both the main surfaces 21a and 21b of the wiring board 21 are formed. , 4b can be performed in the same plating step, and the manufacturing cost of the semiconductor device can be reduced.
- FIG. 1 When the solder ball 7 is connected to the land 4b on which the electroless Ni—P plating layer 13a, the electroless Pd plating layer 13b, and the electroless Au plating layer 13c are formed in step S6 by solder reflow treatment or the like, FIG. As shown in (2), Au (gold) of the electroless Au plating layer 13c and Pd (palladium) of the electroless Pd plating layer 13b melt into the solder of the solder ball 7. And no electricity Solution Ni (nickel) in the Ni—P plating layer 13 a reacts with the solder of the solder ball 7 to form an alloy layer 51.
- the alloy layer 51 is made of an alloy (tin alloy) containing solder (Sn) of the solder constituting the solder ball 7 and Ni (nickel) of the electroless Ni—P plating layer 13a. Powerful.
- the alloy layer 51 is made of an alloy containing Sn (tin), Ni (nickel) and Cu (copper) (for example, Sn-Ni-Cu alloy). Consists of Therefore, after the solder balls 7 are connected to the lands 4b of the wiring board 21 (wiring board 2), the solder balls 7 are formed by the alloy layer (Sn—Ni alloy layer) 51 and the electroless Ni—P plating.
- the land portion 4b is formed by the conductor layer (copper film) 11 exposed from the opening 12a of the solder resist layer 12 and the electroless layer formed thereon.
- the land portion 4b is composed of the Ni—P plating layer 13a and is connected to the solder ball 7 via the alloy layer 51.
- the region near the interface between the alloy layer 51 and the electroless Ni-P plating layer 13a is compared with other regions of the electroless Ni-P plating layer 13a.
- a phosphorus concentration layer 52 having a high phosphorus (P) concentration (ratio) (low Ni concentration) is formed. This is because when the solder ball 7 is connected to the land 4b, Ni in the surface layer of the electroless Ni—P plating layer 13a (the surface layer on the solder ball 7 side) reacts with the solder of the solder ball 7 to form an alloy.
- the layer 51 is formed, and accordingly, the Ni content in the surface layer portion (ie, the phosphorus-enriched layer 52) decreases (ie, the P content increases), and the interface between the alloy layer 51 and the electroless Ni—P plating layer 13a is reduced. This is because a phosphorus-enriched layer 52 was formed in the vicinity.
- the phosphorus-enriched layer 52 is also composed of an electroless Ni—P plating layer (an electroless Ni-plating layer containing P, an alloy of Ni and P). Also, the concentration (ratio) of phosphorus (P) is higher than that of the electroless Ni—P plating layer 13a on the inner side (conductor layer 11 side).
- the plating layer 13 on the surface of the land portion 4b (conductor layer 11) shown in FIG. 3 is composed of the electroless Ni—P plating layer 13a and the electroless Pd plating layer 13b before the solder ball 7 is connected. And an electroless Au plating layer 13c, and after connection of the solder balls 7, an electroless Ni—P plating layer 13a (and a phosphorus-enriched layer 52).
- the connection strength with the solder ball 7 hardly decreases, voids are formed at the interface between the electroless Ni—P plating layer 13a and the alloy layer 51 (that is, the interface between the phosphorus-enriched layer 52 and the alloy layer 51). In this case, it was newly found that the connection strength between the land portion 4b and the solder ball 7 was reduced.
- FIG. 21 is a partially enlarged view showing a comparative example in which voids (microvoids) 61 are formed at the interface (near the interface) between the electroless Ni—P plating layer 13a (the phosphorus-enriched layer 52) and the alloy layer 51.
- FIG. 3 is a cross-sectional view (a cross-sectional view of a main part), schematically showing a region near an interface between the phosphorus-enriched layer 52 and the alloy layer 51 of the electroless Ni—P plating layer 13a.
- connection strength (joining strength) of the solder ball 7 was reduced.
- a void 61 of about lOnm or more exists at the interface between the electroless Ni—P plating layer 13a and the alloy layer 51 (ie, the interface between the phosphorus-enriched layer 52 and the alloy layer 51). Then, the connection strength of the solder ball 7 is reduced.
- FIG. 20 is a sectional view showing the same region as in FIG.
- the void 61a generated at the interface (near the interface) between the electroless Ni—P plating layer 13a and the upper electroless plating layer (here, the electroless Pd plating layer 13b) forms the solder ball 7 into the land 4b.
- the void 61 is formed at the interface (near the interface) between the electroless Ni—P plating layer 13a and the alloy layer 51.
- FIG. 23 is an explanatory diagram of the generation mechanism of the void 6 la.
- FIG. 24 is a table (explanatory diagram) showing natural electrode potentials of various metals.
- the generation of void 61a (that is, the generation of void 61) is performed by forming electroless Ni-P plating layer 13a. This is due to a substitution reaction that occurs during the electroless plating performed on the surface of the electroless Ni—P plating layer 13a after the electroless plating.
- the Ni (nickel) of the electroless Ni—P plating layer 13a is changed during the next electroless plating process. The electrons are released and ionized to dissolve into the electroless plating solution, and the (electrons) are converted to metal ions (Pd ions when forming the electroless Pd plating layer 13b) in the electroless plating solution.
- the underlying electroless Ni—P plating layer 13a is formed.
- Amount of Ni (-nickel) eluted into the electroless plating solution that is, to form an electroless plating layer on the electroless Ni--P plating layer 13a from the electroless Ni--P plating layer 13a) of the electroless plated solution, Ni if so below elution amount) 5 X 10- 6 kg / m 2 of (nickel) (i.e.
- voids 6 la could be prevented from being generated at the interface (near the interface) between the electroless Ni—P plating layer 13a and the upper electroless melting layer.
- voids 61a having a size of about lOnm or more (for example, about several tens of nm in diameter) from being generated at the interface (near the interface) between the electroless Ni-P plating layer 13a and the upper electroless plating layer. can do.
- the amount of Ni that elutes from the electroless Ni—P plating layer 13a into the electroless plating solution is determined by the weight of Ni (nickel) dissolved in the electroless plating solution and the plating area (the area of the electroless Ni— (Area of the P plating layer 13a).
- the weight of Ni (nickel) dissolved in the electroless plating solution can be measured by, for example, an atomic absorption spectrophotometer.
- Ni (P) is transferred from the electroless Ni-P plating layer 13a into the electroless plating solution.
- the amount of nickel) eluted can be controlled, for example, by adjusting additives and the like to the electroless plating solution.
- Pd palladium
- Au gold
- the potential gap when an Au film is formed on a Ni film is 1.65 eV
- the potential gap is 1.08 eV. Therefore, the formation of the electroless Pd plating layer 13b is omitted and the electroless Ni—P plating layer 13a is formed on the electroless Ni—P plating layer 13a.
- the substitution reaction as described above substitution reaction on the surface of the electroless Ni—P plating layer 13a
- local corrosion of the electroless Ni—P plating layer 13a can be suppressed or prevented.
- the electroless Ni—P plating layer 13b is formed on the electroless Ni—P plating layer 13a, and the electroless Au plating layer 13c is formed thereon.
- the substitution reaction on the surface of the electroless Ni—P plating layer 13a is further reduced, and the electroless Ni—P plating layer 13a and its upper layer are formed.
- the generation of voids 6 la at the interface with the electroless plating layer can be more accurately prevented.
- FIG. 25 is a partially enlarged cross-sectional view (main-part cross-sectional view) showing a region near the interface between phosphorus-enriched layer 52 and alloy layer 51 of electroless Ni—P plating layer 13a in the present embodiment. Corresponds to Figure 21.
- the next electroless plating is performed on electroless Ni—P plating layer 13a.
- the electroless Ni-P plating layer 13a and the upper electroless plating layer 13a (here, electroless Pd plating) Voids 61a are prevented from being formed at the interface (near the interface) with the layer 13b), so that when the solder ball 7 is connected to the land 4b, the phosphorus concentration of the electroless Ni—P plating layer 13a ( The void 61 is prevented from being formed at the interface (near the interface) between the layer 52) and the alloy layer 51. Therefore, in semiconductor device 1 of the present embodiment, as shown in FIG.
- the interface (near the interface) between electroless Ni—P plating layer 13a (phosphorus enriched layer 52) and alloy layer 51 is formed. No voids are formed, and no voids of about lOnm or more exist at the interface (near the interface) between the electroless Ni—P plating layer 13a (the phosphorus-enriched layer 52) and the alloy layer 51. Therefore, the bonding area between the solder ball 7 and the land portion 4b is increased, and cracks are generated at the interface between the solder ball 7 and the land portion 4b (the interface between the electroless Ni—P plating layer 13a and the alloy layer 51).
- the wiring base of the semiconductor device 1 The strength of the solder connection of the solder connection terminal (land portion 4b) of the plate 2 can be improved. Further, the reliability of the semiconductor device 1 can be improved. Further, the reliability (reliability of solder connection) of the wiring board 21 for manufacturing the semiconductor package (semiconductor device 1) can be improved.
- the electroless Pd plating layer 13b may be omitted, and the electroless Au plating layer 13c may be formed on the electroless Ni—P plating layer 13a.
- the electroless plating treatment in this case, the electroless Au plating treatment
- the electroless plating is performed from the electroless Ni—P plating layer 13a.
- the amount of Ni (nickel) eluted into the adhering solution in this case, the electroless Au plating solution
- the solder connection terminals (land portions) of the wiring board 2 of the semiconductor device 1 can be improved. 4b) The strength of the solder connection can be improved.
- an electroless Pt (platinum, platinum) plating layer or an electroless Ag (silver) plating layer may be replaced by an electroless Ni—P plating layer 13a.
- the present embodiment can be applied to the case where the semiconductor device is formed above. Also in this case, after forming the electroless Ni-P plating layer 13a on the copper land 4b, electroless plating (in this case, electroless Pt plating or electroless Ag plating) is performed on the surface.
- an electroless plated solution from electroless solutions Ni- P plated layer 13a (the elution amount of Ni (nickel) for this case is electroless Pt plating solution or electroless solutions Ag plating solution) 5 X 10- 6 kgZm 2 (ie, 5 ⁇ g / rn) or less.
- the strength of the solder connection of the solder connection terminals (land portions 4b) of the wiring board 2 of the semiconductor device 1 can be improved.
- the land portion 32 of the mounting board 31 on which the semiconductor device 1 as shown in FIGS. 13 and 14 is mounted is made of a conductor material mainly composed of copper such as a copper film (copper foil). The surface of the copper land portion 32 is subjected to a plating process, and the solder ball 7 of the semiconductor device 1 is connected to the plated land portion 32.
- the plating of the surface of the land portion 32 for solder connection of the mounting board 31 is performed in the same manner as the plating process of the surface of the land portion 4b for solder connection of the wiring board 21 (step S2a—the plating of S2c). Is more preferable.
- the mounting board 31, which is a wiring board for mounting the semiconductor device 1 is manufactured or prepared as follows. First, a mounting substrate 31 having a copper land portion 32 exposed on the main surface of the mounting substrate 31 is prepared, and an electroless Ni-adhesive layer containing P (phosphorus) is formed on the surface of the land portion 32.
- Ni—P plating layer corresponding to the electroless Ni—P plating layer 13a
- electroless plating for example, electroless Pd plating, electroless Au plating, electroless Pt plating or electroless Ag plating, more preferably electroless Pd plating
- the elution amount of Ni (nickel) to electroless plated solution 5 X 10- 6 kgZm 2 (i.e. 5 gZm 2) to be less than or equal to.
- an electroless Ni—P plating layer and another electroless plating layer thereon eg, an electroless Pd plating layer
- the electroless Ni—P plating It is possible to prevent the formation of minute voids (voids similar to void 6 la) at the interface (near the interface) between the layer and the upper electroless plating layer (for example, the electroless Pd plating layer).
- an electroless plating layer (for example, an electroless Au plating layer) is further formed on the upper layer, and a mounting substrate 31 having a land portion 32 on the surface of which a plating layer is formed is manufactured.
- the plating layer 34 on the surface of the land 32 is formed by the electroless Ni—P plating layer, the electroless Pd plating layer, and the It can be formed by an electrolytic Au plating layer.
- the solder balls 7 of the semiconductor device 1 are connected to the lands 32 of the mounting board 31 manufactured in this manner by a solder reflow process, and the semiconductor device 1 is mounted on the mounting board 31 as shown in FIGS. 13 and 14. Can be implemented.
- the land 32 An alloy layer containing Sn and Ni, such as the above alloy layer 51, is formed at the interface between the electroless Ni—P plating layer and the solder ball 7 on the surface. No minute voids (voids similar to void 61) are formed at the interface (near the interface) with the (electrolyte-enriched layer) of the electrolytic Ni-P plating layer.
- the connection strength between the solder balls 7 of the semiconductor device 1 and the lands 32 of the mounting board 31 can be improved, and the strength of the solder connection of the mounting board 31 on which the semiconductor package (semiconductor device 1) is mounted by soldering can be improved. Can be improved.
- the reliability of the mounting board 31 for mounting the semiconductor cage (semiconductor device 1) can be improved. Also, on the mounting board 31, terminals (land portions) for soldering other electronic components which are connected only with the land portions 32 for mounting the semiconductor device 1 (for connecting the solder balls 7) are also provided on the surface of the land portions 32. It is more preferable that the same plating process as the plating process is performed in the same plating step, so that the connection strength (solder joint) between the semiconductor device 1 and other electronic components and the mounting board 31 is improved. Can be improved.
- the solder (here, the solder ball 7) to be connected to the lands (the lands 4b and the lands 32) plated as described above is a solder that does not contain lead (Pb).
- Pb a solder that does not contain lead
- This embodiment is particularly effective when the present embodiment is applied to a case where free soldering power is required.
- Pb-free solder for example, Sn—Ag—Cu-based Pb-free solder can be used.
- Pb-free solder is harder than Pb-containing solder. For this reason, when the solder ball 7 is formed by Pb-free solder, the land portion (the land portion 4b or the land portion 32) and the solder ball 7 are formed in comparison with the case where the solder ball 7 is formed by the relatively soft Pb-containing solder.
- solder ball 7 is formed of Pb-free solder, it is important to increase the connection strength between the solder ball 7 and the land. For this reason, the lands for solder connection (the land 4b and the land 32) are subjected to the tanning treatment as in the present embodiment, and the solder balls 7 are connected to the lands so that the voids 6 1 The solder balls 7 can be connected to each other more firmly by preventing the occurrence of soldering.
- solder material material of the solder balls 7 used for the solder connection of the lands
- solder balls 7 breakage of the connection portion of the solder ball 7 due to the application of stress or the like can be prevented.
- wiring board 21 (wiring board 2) The effect of improving the connection strength of the solder ball 7 in the case where the solder ball 7 is connected to the land portion 4b by the soldering process will be described in more detail.
- FIG. 26 is an explanatory diagram of the shear strength test
- FIG. 27 is a graph showing the results of the shear strength test of various samples
- FIG. 28 is a diagram showing voids in the various samples subjected to the shear strength test. It is a table
- Sample A, Sample B, and Sample C are all semiconductor devices in the BGA package form similar to semiconductor device 1, but as shown in FIG. 28, Sample A is different from the present embodiment, As in the comparative example shown in FIG.
- the sample has microvoids 61 at the interface (near the interface) between the electroless Ni--P plating layer 13a (the phosphorus-enriched layer 52) and the alloy layer 51.
- sample B is a force in which minute voids 61 are generated as in the comparative example shown in FIG.
- a minute void 61 is generated, and the sample is a sample (that is, corresponds to the semiconductor device 1 of the present embodiment).
- the sample C was subjected to the electroless plating (here, the electroless Pd plating) performed on the surface thereof after the formation of the electroless Ni-P plating layer 13a.
- the elution amount of Ni (nickel) from the P plating layer 13a into the electroless plating solution (here, the electroless Pd plating solution) should be 5 X 10 " 6 kg / m 2 (that is, 5 g / m 2 ) or less.
- This prevents voids 61a from being formed at the interface between the electroless Ni--P plating layer 13a and the overlying electroless Pd plating layer 13b, thereby connecting the solder ball 7 to the land 4b.
- the formation of minute voids 61 at the interface between the electroless Ni-P plating layer 13a and the alloy layer (Sn-Ni alloy layer) 51 later is prevented.
- Samples A and B are different from the present embodiment in that the electroless Ni-P plating layer 13a is formed and then subjected to an electroless plating treatment (here, an electroless Pd in can process), elution amount of Ni (nickel) from an electroless Ni- P plating layer 13a to an electroless plated solution (here electroless P d plating liquid) 5 X 10- 6 kgZm 2 (i.e. 5 mu g / m 2 ).
- electroless Pd in can process an electroless Pd in can process
- minute voids 61 are formed at the interface between the electroless Ni-P plating layer 13a and the alloy layer (Sn-Ni alloy layer) 51.
- the presence or absence of the minute void 61 can be confirmed by, for example, SEM (Scanning Electron Microscope) observation of the cross section. Sample A, Sample B and Sample C are prepared in almost the same way except for the step of plating on the land.
- the tool 71 is moved in a direction parallel to the main surface 2b of the wiring board 2 of each of the sample A, the sample B, and the sample C, and A shearing force was applied to the solder ball 7 connected to the land portion 4b by the tool 71, and the amount of the shearing force at which the solder ball 7 was dropped was examined.
- the shear strength test (moving speed of the tool 71) was 250 ⁇ mZs, and the tool height H was 10 ⁇ m.
- FIG. 29 is an explanatory diagram of the tensile strength test
- FIG. 30 is a graph showing the results of the tensile strength tests of various samples. The vertical axis of the graph in FIG. 30 corresponds to the tensile strength.
- Sample A, Sample B and Sample C is a sample of the same type as the sample subjected to the above-mentioned shear strength test.
- the tool 72 is attracted to the solder ball 7 connected to the land 4b of the wiring board 2 of each of the sample A, the sample B, and the sample C. Then, the tool 72 is moved vertically (upward) with respect to the main surface 2b of the wiring board 2 to apply a tensile force to the solder ball 7, and it is checked how much tensile force causes the solder ball 7 to drop.
- the tensile speed was evaluated at 250 mZs in the tensile strength test.
- Figs. 31 and 32 are explanatory diagrams of the impact bending test.
- Fig. 33 is a graph showing an example of measurement of the magnitude of the impact applied in the impact bending test. Opposition It is a table
- Sample A, Sample B and Sample C is a sample of the same type as the sample subjected to the above-mentioned shear strength test and tensile strength test.
- the semiconductor device (BGA-type semiconductor device) 75 corresponding to the sample, sample A, sample B or sample C is mounted on the mounting board 76 via the solder balls 7 as shown in FIG.
- the connection is made (for example, as shown in FIG. 13 above), and the rear surface of the mounting substrate 76 (the main surface opposite to the main surface on which the semiconductor device 75 is mounted) faces upward, and the rear surface of the mounting substrate 76 is
- the rod 77 is dropped to apply an impact to the solder joint (solder ball 7 joint) from the back side of the mounting board 76.
- the magnitude of the applied shock can be monitored by a strain gauge 78 attached to a mounting substrate 76 near a corner of the semiconductor device 75, as schematically shown in the plan view of FIG.
- the span L in Fig. 31 was set to 9
- FIG. 33 is a graph showing a measurement example of the magnitude of the impact applied during the impact bending test.
- the vertical axis of the graph of FIG. 33 corresponds to the strain generated in the strain gauge 78.
- the horizontal axis of the graph corresponds to the time since the impact was applied.
- a distortion of about 200 Oppm occurs in the mounting board 76 in about 0.002 seconds. Height H for dropping rod 77, etc.
- the magnitude of the applied shock (corresponding to the peak value in the graph in Fig. 33) can be changed.
- the impact strength of the impact bending test largely depends on the presence or absence of the minute void 61, and the impact resistance of the minute void 61 is larger than that of the sample A and the sample B in which the minute void 61 exists.
- the nonexistent sample C that is, the semiconductor device 1 of the present embodiment
- a very small void 61 (particularly, a diameter of about lOnm or more) By eliminating the voids, the impact strength in the impact bending test can be improved, and the connection strength of the solder balls 7 in the semiconductor device 1 can be improved. Thus, the reliability of the semiconductor device can be improved.
- the land of wiring board 21 (wiring board 2) is
- the electroless Ni--P plating layer 13a in the electroless Pd plating step of step S2b is transferred into the electroless Pd plating solution.
- the relationship between the amount of Ni eluted, the presence / absence of voids 61 (voids 61a), and the connection strength of the solder balls 7 was further investigated by the following experiment.
- An electroless Ni-P plating layer 13a is formed on a Cu land portion 4b of a wiring board 21 (wiring board 2) for a semiconductor device in a BGA package form, and an electroless Pd plating layer 13b is formed thereon. Then, an electroless flash Au plating film and an electroless reduced Au plating film are formed on it, and an electroless Au plating layer 13c is formed on the surface to produce various samples (semiconductor device in the same BGA package form as semiconductor device 1).
- Figure 35 shows the results of the impact bending test.
- the elution amount of Ni into the electroless Pd plating solution can be measured, for example, as follows. Sample 1 100 ml of the same plating solution used to make Sample 6 was sampled, and electroless Ni-P plating was performed on a 3 cm X 3 cm (3 cm square) Cu plate (copper plate), followed by electroless Pd plating was performed, and then electroless Au plating was performed. The conditions of each electroless plating at this time are almost the same as the conditions of each electroless plating treatment on the copper land portion 4b of Sample 1 and Sample 6.
- Electroless Ni-P plating includes two types of plating solutions using nickel sulfate, sodium hypophosphite, oxycarboxylic acid, sulfuric acid, sodium hydroxide, and inorganic sulfur-containing compounds (first and second).
- a second electroless Ni—P plating solution was used.
- Examples of electroless Pd plating include a dimethyl compound, ammonia, an amine compound, an aliphatic monocarboxylic acid, and an aliphatic dicarboxylic acid.
- Three kinds of plating solutions (first, second and third electroless Pd plating solutions) using an acid, an aliphatic polycarboxylic acid, and an aqueous solution thereof were used.
- a plating solution using a water-soluble polyaminopolycarboxylic acid containing potassium salt of cyanide, a water-soluble amine, a derivative thereof, and a pH adjuster was used.
- electroless reduced gold plating include water-soluble gold sulfite compounds, water-soluble polyaminopolycarboxylic acids, salts thereof, water-soluble amines, derivatives thereof, thiosulfates, sulfites, hydrazine compounds, and benzotriazole compounds.
- Samples 1, 3, and 5 used the first electroless Ni-P plating solution
- samples 2, 4, and 6 used the second electroless Ni-P plating solution.
- Samples 1 and 2 use the first electroless Pd plating solution
- Samples 3 and 4 use the second electroless Pd plating solution
- Samples 5 and 6 use the third electroless Pd plating solution. The liquid was used.
- FIG. 36 is a graph showing an example of analysis of the formed accretion layer.
- SIMS For analysis, SIMS (
- the vertical axis of the graph in FIG. 36 corresponds to the count number at the time of analysis by SIMS, and the horizontal axis of the graph in FIG. 36 corresponds to the sputtering depth (ie, the depth of the surface force of the plating layer).
- the sputtering depth ie, the depth of the surface force of the plating layer.
- SIMS measurement conditions were: primary ion force Cs +, acceleration voltage: 14 kV, current: 25 nA, beam diameter: 60 ⁇ m, etching area: 200 ⁇ mD (200 mx 200 ⁇ m), data acquisition area: force center 70 ( 70 m X 70 m), the vacuum degree was performed at 5 X 10- 7 Pa.
- the amount of S (sulfur) was defined as the ratio of the number of S to the number of Ni at the measurement depth of 1500 nm. In the measurement examples (Sample 2, Sample 4 or Sample 6) shown in the graph of FIG. 36, the amount (content) of S is about 1%.
- the content of S (sulfur) in the electroless Ni-P plating layer depends on the electroless Ni-P plating solution used, and samples 1 and 2 were prepared using the same first electroless Ni-P plating solution.
- the electroless Ni-P plating layers 13a of Samples 3 and 5 show almost the same S (sulfur) content (content rate), but the sample 2 using a different second electroless Ni-P plating solution was used.
- S (sulfur) content (content) is higher than that of electroless Ni-P plating layer 13a of sample 4 and sample 6! /.
- Fig. 37 shows the content of S (sulfur) in the electroless Ni-P plating layer 13a (horizontal axis of the graph in Fig. 37) and the amount of 38 is a graph plotting the amount of Ni dissolved into the electroless Pd plating solution (vertical axis in the graph of FIG. 37).
- sample 1 was broken by a 1500 ppm impact at the solder joint (joint between the land 4b of the wiring board 2 and the solder ball 7). 2 and Sample 3 break at the solder joint at 1700 ppm impact! /, Whereas Sample 4, Sample 5 and Sample 6 break at the solder joint even when 3000 ppm impact is applied. The power that did not arise. In this way, Sample 1, Sample 2 and Sample 3, where micro voids 61 (void 6 la) are generated, generate micro voids 61 (void 61a), which have low impact strength in the impact bending test. Sample 4, Sample 5 and Sample 6 which did not have a high impact strength in the impact bending test. In the graph of FIG.
- the impact strength of the impact bending test was shown by electroless Ni-P plating.
- the electroless Ni-P plating layer 13a is formed when the electroless Pd plating layer 13b is formed on the electroless Ni-P plating layer 13a. From the figure, it can be seen that it greatly depends on the amount of Ni eluted into the electroless Pd plating solution.
- the electroless Ni-P plating layer 13a is formed on the Cu land 4b of the wiring board 21 (wiring board 2), and then is formed on the surface thereof.
- Ni nickel
- the electroless plating solution here, the electroless Pd plating solution
- the elution amount of) 5 X 10- 6 kgZm 2 (i.e. 5 ⁇ gZm 2) or less (samples 4, by the sample 5 and corresponds to sample 6), micro voids 61, as described above in (voids 61a) It can prevent the occurrence and improve the impact resistance of the impact bending test. Thereby, the connection strength of the solder ball 7 (with the land portion 4b) in the semiconductor device 1 can be improved. Therefore, the reliability of the semiconductor device can be improved.
- the electroless Ni—P plating layer 13a is formed on the copper land 4b, and the electroless Pd plating layer 13b is formed thereon.
- An electroless Au plating layer 13c is formed on the upper layer.
- the graph of FIG. 38 shows that the electroless Ni—P plating layer 13a was formed on the copper land and the electroless Pd plating layer 13b was formed thereon, as in the present embodiment.
- the sample in which the electroless Au plating layer 13c was formed on the top layer shown as AuZPdZNi-P in the graph of Fig.
- the electroless Ni-P plating layer 1 Compared to the case where the electroless Au plating layer 13c is formed directly on 3a, as in the present embodiment, the electroless Ni-P plating layer 13a formed on the copper land portion By forming the 13b and then forming the electroless Au plating layer 13c thereon, the wettability of the land solder can be further improved.
- FIG. 39 shows the result of examining the connection strength of the bonding wires 5 to the lands 4 a of the wiring board 2 (wiring board 21).
- the land portions 4a, 4b of both main surfaces 21a, 21b of the wiring board 21 (wiring board 2) are subjected to the same plating treatment, so that the copper land portions 4a for wire bonding are formed.
- An electroless Ni—P plating layer 13a, an electroless Pd plating layer 13b, and an electroless Au plating layer 13c are sequentially formed on the top!
- the graph of FIG. 39 shows the result of evaluating the connection strength of the bonding wire 5 to the land portion 4a subjected to such a tanning treatment.
- FIG. 39 corresponds to the heat treatment time (heat treatment temperature is 180 ° C) when the heat treatment is performed after forming the electroless plating layer, and the vertical axis of the graph in Fig. 39 is the land. Corresponds to the connection strength (bonding strength) of the bonding wire connected to the part. Further, in the graph of FIG. 39, as in the present embodiment, an electroless Ni—P plating layer 13a is formed on a copper land portion, and an electroless Pd plating layer 13b is formed thereon, The sample with the electroless Au plating layer 13c formed on the top layer (shown as Au ZPdZNi-P in the graph of Fig.
- the electroless Pd plating layer 13b is formed on the electroless Ni—P plating layer 13a formed on the copper land so that the graph force of FIG. Therefore, by forming the electroless Au plating layer 13c thereon, the wire bonding property with respect to the land can be improved, and the connection strength of the bonding wire can be further improved.
- the electroless melting treatment is performed on the strong land portion 4b such as the copper film of the wiring board to form the electroless Ni—P plating layer 13a and the electroless Pd plating layer 13b. Then, an electroless Au plating layer 13c is formed in order, and then the solder ball 7 is connected to the land portion 4b.
- a solder ball 7 is directly connected without forming a plating layer on a land portion 4b that is strong such as a copper film, an alloy layer of copper and solder in the land portion 4b is formed. As a result, the connection strength between the land 4b and the solder ball 7 may be reduced.
- the electroless Ni--P plating layer 13a as the noria layer on the land 4b as in the present embodiment, the copper in the land 4b reacts with the solder of the solder balls 7. Alloying can be prevented, and the connection strength between the land portion 4b and the solder ball 7 can be improved.
- P phosphorus
- the electroless Ni--P plating layer 13a which is a P-containing electroless Ni plating layer
- the growth rate of the electroless Ni—P plating layer 13a on the land can be increased, the life of the plating solution for forming the electroless Ni—P plating layer 13a can be extended, and The stability of the liquid can be increased. Further, the cost required for the plating step can be reduced.
- a Ni plating layer such as the electroless Ni-P plating layer 13a is easily oxidized, but in the present embodiment, a metal that is difficult to oxidize as a protective film on the electroless Ni-P plating layer 13a is used. Since the plating layers (the electroless Pd plating layer 13b and the electroless Au plating layer 13c) are formed, the oxidation of the plating layer including the electroless Ni—P plating layer 13a can be prevented.
- the plating layer of land portion 4a (land portion 4a for wire bonding) of main surface 21a of wiring substrate 21 (wiring substrate 2) and wiring substrate 21 (wiring substrate 2) And the same plating layer (electroless Ni-P plating layer 13a, electroless Pd plating layer 13b and electroless Au plating layer) 13c), the step of attaching the land portion 4a and the step of attaching the land portion 4b can be performed in the same attaching step, and the manufacturing of the wiring board 21 and the semiconductor device manufactured using the same can be performed. Costs can be reduced.
- the bonding wires 5 are connected to the lands 4a on the main surface 21a of the wiring board 21 (wiring board 2). Ultrasonic waves are easily transmitted in the wire bonding step, and the connection strength of the bonding wire 5 to the land portion 4a can be increased. Also, the bonding wire 5 was connected to the land 4a of the main surface 21a of the wiring board 21 (wiring board 2) by forming the outermost plating layer of the lands 4a and 4b with the electroless Au plating layer 13c. In some cases, the connection strength of the bonding wire 5 to the land portion 4a can be increased.
- phosphorus (P) is placed on lands (lands 4b of wiring board 2 (wiring board 21) and lands 32 of mounting board 31) as terminals for solder connection.
- An electroless Ni—P plating layer (electroless Ni—P plating layer 13a), which is an electroless plating layer, is formed, and the next electroless plating layer (electroless Ni—P plating layer) is formed on the surface of the electroless Ni—P plating layer. That is, when forming the electroless plating layer on the electroless Ni-P plating layer), the electroless plating layer on the electroless MP plating layer is formed from the electroless Ni-P plating layer 13a.
- voids especially voids having a diameter of lOnm or more
- such land portions can be prevented.
- Voids at the interface between the land and solder (the interface between the electroless Ni-P plating layer and the Sn-Ni alloy layer) when soldering (solder ball connection) is made (especially voids with a diameter of lOnm or more) Is prevented, and the strength of the solder connection (solder ball connection strength) of the land can be improved.
- the impact strength of the impact bending test can be improved. Therefore, the reliability of the semiconductor device
- solder connection or solder mounting can be improved.
- it has terminals for solder connection, and can improve the reliability (reliability of solder connection or solder mounting) of a wiring board used for manufacturing a semiconductor package (semiconductor device).
- it has terminals for solder connection, and can improve the reliability (solder connection or solder mounting reliability) of the wiring board (mounting board) used for mounting the semiconductor package (semiconductor device).
- an electroless plating layer containing phosphorus (P) is formed on a land portion (land portion 4b of wiring board 2 (wiring board 21) and land portion 32 of mounting board 31).
- An electroless Ni-P plating layer (electroless Ni-P plating layer 13a) is formed, and the electroless plating layer formed thereon further includes an electroless Pd (palladium) plating layer, an electroless Au ( A force capable of using a gold) plating layer, an electroless Pt (white gold, platinum) plating layer, an electroless Ag (silver) plating layer, or the like, and more preferably an electroless Pd (palladium) plating layer.
- the electroless plating process is performed on the surface after the electroless Ni-P plating layer is formed.
- the substitution reaction on the surface of the plating layer is further reduced, and the local corrosion of the electroless Ni-P plating layer is suppressed or prevented.
- the generation of voids at the interface (near the interface) between the iP plating layer and the electroless plating layer thereon can be more accurately prevented. Thereby, the strength of the solder connection of the lands (the land 4b of the wiring board 2 (the wiring board 21) and the land 32 of the mounting board 31) can be more accurately improved.
- the present invention can be applied to, for example, a wiring board having terminals for solder connection, a semiconductor device using the same, and the like.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Computer Hardware Design (AREA)
- Power Engineering (AREA)
- General Physics & Mathematics (AREA)
- Manufacturing & Machinery (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Physics & Mathematics (AREA)
- Materials Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemically Coating (AREA)
- Internal Circuitry In Semiconductor Integrated Circuit Devices (AREA)
- Wire Bonding (AREA)
Description
Claims
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JP2006510878A JPWO2005087980A1 (ja) | 2004-03-15 | 2004-12-28 | 半導体装置、半導体装置の製造方法および配線基板の製造方法 |
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JP2004-071982 | 2004-03-15 | ||
JP2004071982 | 2004-03-15 |
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TW (1) | TW200534438A (ja) |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009253054A (ja) * | 2008-04-07 | 2009-10-29 | Fujitsu Ltd | 電子部品装置及び電子部品装置の製造方法 |
US8581225B2 (en) | 2010-04-28 | 2013-11-12 | Panasonic Corporation | Variable resistance nonvolatile memory device and method of manufacturing the same |
JP2014194063A (ja) * | 2013-03-29 | 2014-10-09 | Jx Nippon Mining & Metals Corp | めっき物 |
Families Citing this family (1)
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CN110565058B (zh) * | 2019-08-29 | 2021-07-27 | 江苏长电科技股份有限公司 | 一种bga产品的磁控溅射方法 |
-
2004
- 2004-12-28 WO PCT/JP2004/019583 patent/WO2005087980A2/ja active Application Filing
- 2004-12-28 JP JP2006510878A patent/JPWO2005087980A1/ja active Pending
- 2004-12-31 TW TW093141802A patent/TW200534438A/zh unknown
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009253054A (ja) * | 2008-04-07 | 2009-10-29 | Fujitsu Ltd | 電子部品装置及び電子部品装置の製造方法 |
US8581225B2 (en) | 2010-04-28 | 2013-11-12 | Panasonic Corporation | Variable resistance nonvolatile memory device and method of manufacturing the same |
JP2014194063A (ja) * | 2013-03-29 | 2014-10-09 | Jx Nippon Mining & Metals Corp | めっき物 |
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Publication number | Publication date |
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JPWO2005087980A1 (ja) | 2007-08-09 |
TW200534438A (en) | 2005-10-16 |
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