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WO2022092129A1 - 配線基板、電子装置及び電子モジュール - Google Patents

配線基板、電子装置及び電子モジュール Download PDF

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Publication number
WO2022092129A1
WO2022092129A1 PCT/JP2021/039572 JP2021039572W WO2022092129A1 WO 2022092129 A1 WO2022092129 A1 WO 2022092129A1 JP 2021039572 W JP2021039572 W JP 2021039572W WO 2022092129 A1 WO2022092129 A1 WO 2022092129A1
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WO
WIPO (PCT)
Prior art keywords
conductor
wiring
hole
crystal grains
wiring board
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2021/039572
Other languages
English (en)
French (fr)
Inventor
祐城 竹嶋
義博 細井
祐志 釡瀬
恭平 山下
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kyocera Corp
Original Assignee
Kyocera Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kyocera Corp filed Critical Kyocera Corp
Priority to EP21886247.2A priority Critical patent/EP4239668A4/en
Priority to KR1020237013993A priority patent/KR20230074556A/ko
Priority to CN202180073797.6A priority patent/CN116529870A/zh
Priority to JP2022559183A priority patent/JPWO2022092129A1/ja
Priority to US18/033,827 priority patent/US20230403793A1/en
Publication of WO2022092129A1 publication Critical patent/WO2022092129A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/02—Details
    • H05K1/11—Printed elements for providing electric connections to or between printed circuits
    • H05K1/111—Pads for surface mounting, e.g. lay-out
    • H05K1/112—Pads for surface mounting, e.g. lay-out directly combined with via connections
    • H05K1/113—Via provided in pad; Pad over filled via
    • H10W20/4421—
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/02—Details
    • H05K1/09—Use of materials for the conductive, e.g. metallic pattern
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/02—Details
    • H05K1/11—Printed elements for providing electric connections to or between printed circuits
    • H05K1/115—Via connections; Lands around holes or via connections
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/02—Details
    • H05K1/14—Structural association of two or more printed circuits
    • H05K1/141—One or more single auxiliary printed circuits mounted on a main printed circuit, e.g. modules, adapters
    • 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
    • H05K3/10—Apparatus or processes for manufacturing printed circuits in which conductive material is applied to the insulating support in such a manner as to form the desired conductive pattern
    • H05K3/18—Apparatus or processes for manufacturing printed circuits in which conductive material is applied to the insulating support in such a manner as to form the desired conductive pattern using precipitation techniques to apply the conductive material
    • 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
    • H05K3/40—Forming printed elements for providing electric connections to or between printed circuits
    • H05K3/42—Plated through-holes or plated via connections
    • 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
    • H05K3/40—Forming printed elements for providing electric connections to or between printed circuits
    • H05K3/42—Plated through-holes or plated via connections
    • H05K3/422—Plated through-holes or plated via connections characterised by electroless plating method; pretreatment therefor
    • 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
    • H05K3/40—Forming printed elements for providing electric connections to or between printed circuits
    • H05K3/42—Plated through-holes or plated via connections
    • H05K3/423—Plated through-holes or plated via connections characterised by electroplating method
    • 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
    • H05K3/40—Forming printed elements for providing electric connections to or between printed circuits
    • H05K3/42—Plated through-holes or plated via connections
    • H05K3/425—Plated through-holes or plated via connections characterised by the sequence of steps for plating the through-holes or via connections in relation to the conductive pattern
    • H05K3/426—Plated through-holes or plated via connections characterised by the sequence of steps for plating the through-holes or via connections in relation to the conductive pattern initial plating of through-holes in substrates without metal
    • H10W70/095—
    • H10W70/635—
    • H10W70/68—
    • H10W70/692—
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/02—Details
    • H05K1/03—Use of materials for the substrate
    • H05K1/0306—Inorganic insulating substrates, e.g. ceramic, glass
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/09—Shape and layout
    • H05K2201/09209—Shape and layout details of conductors
    • H05K2201/095—Conductive through-holes or vias
    • H05K2201/09563—Metal filled via
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/09—Shape and layout
    • H05K2201/09818—Shape or layout details not covered by a single group of H05K2201/09009 - H05K2201/09809
    • H05K2201/09827—Tapered, e.g. tapered hole, via or groove
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
    • H05K2201/10227—Other objects, e.g. metallic pieces
    • H05K2201/10378—Interposers
    • 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
    • H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
    • H05K2203/07—Treatments involving liquids, e.g. plating, rinsing
    • H05K2203/0703—Plating
    • H05K2203/072—Electroless plating, e.g. finish plating or initial plating
    • 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
    • H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
    • H05K2203/07—Treatments involving liquids, e.g. plating, rinsing
    • H05K2203/0703—Plating
    • H05K2203/0723—Electroplating, e.g. finish plating
    • 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
    • H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
    • H05K2203/11—Treatments characterised by their effect, e.g. heating, cooling, roughening
    • H05K2203/1126—Firing, i.e. heating a powder or paste above the melting temperature of at least one of its constituents
    • 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
    • H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
    • H05K2203/11—Treatments characterised by their effect, e.g. heating, cooling, roughening
    • H05K2203/1131—Sintering, i.e. fusing of metal particles to achieve or improve electrical conductivity
    • H10W70/66—

Definitions

  • This disclosure relates to wiring boards, electronic devices and electronic modules.
  • the wiring board according to the present disclosure is An insulating substrate having a first surface, a second surface opposite to the first surface, and a through hole extending from the first surface to the second surface.
  • a wiring conductor located on the first surface and connected to the through conductor, Equipped with The through conductor and the wiring conductor contain copper as a main component and contain copper as a main component.
  • the average size of Cu crystal grains in the through conductor is larger than the average size of Cu crystal grains in the wiring conductor.
  • the electronic device according to this disclosure is With the above wiring board, Electronic components mounted on the wiring board and To prepare for.
  • the electronic module according to this disclosure is With the above electronic devices The module board on which the electronic device is mounted and To prepare for.
  • FIG. 1 It is a perspective view which shows the wiring board which concerns on embodiment of this disclosure. It is sectional drawing which shows the main part of the wiring board of FIG. It is a figure explaining the measuring method of the size of a Cu crystal grain. It is sectional drawing which shows the main part of the wiring board. It is a top view which shows the main part of the wiring board. It is explanatory drawing which shows an example of the manufacturing method of the wiring board which concerns on embodiment. It is a figure which shows the electronic apparatus and the electronic module which concerns on embodiment of this disclosure.
  • FIG. 1 is a perspective view showing a wiring board according to an embodiment of the present disclosure.
  • FIG. 2 is a cross-sectional view showing a main part of the wiring board of FIG.
  • FIG. 2 shows a cross section of a portion of the wiring board 1 where the through conductor 25 is located.
  • the wiring board 1 of the present embodiment includes an insulating substrate 10 having a first surface 11, a second surface 12 on the opposite side of the first surface 11, and a through hole 13 extending from the first surface 11 to the second surface 12. It includes a wiring conductor 21 located on the surface 11, a through conductor 25 located on the through hole 13 and the opening 13a of the through hole 13, and a wiring conductor 23 located on the second surface 12. The through conductor 25 is also located on the opening 13b on the second surface 12 side (opposite to the through hole 13). The through conductor 25 is connected to the wiring conductors 21 and 23.
  • the insulating substrate 10 may be made of a ceramic containing aluminum nitride, silicon nitride, silicon carbide, alumina, zirconia, or the like as a main component.
  • the through hole 13 has an opening 13a on the first surface 11 side and an opening 13b on the second surface 12 side, as shown by the alternate long and short dash line in FIG. Since the through conductor 25 is located in the through hole 13 and the openings 13a and 13b, the space is not open.
  • the inner diameters of the openings 13a and 13b are larger than the inner diameter of the intermediate portion 13i of the through hole 13.
  • the intermediate portion 13i means a flat surface portion in the through hole 13 parallel to the first surface 11 between the openings 13a and the openings 13b.
  • the inner diameter of the through hole 13 may be gradually increased from the intermediate portion 13i to the opening 13a on the first surface 11 side.
  • the inner diameter of the through hole 13 may be gradually increased from the intermediate portion 13i to the opening 13b on the second surface 12 side.
  • the through hole 13 does not have to have a circular cross-sectional shape (cross-sectional shape parallel to the first surface 11), and if it is not circular, the above “inner diameter” may be read as "maximum width”.
  • the wiring conductor 21 includes a main conductor portion 211 containing Cu (copper) as a main component, and an intermediate layer 212 located between the main conductor portion 211 and the first surface 11.
  • the through conductor 25 includes a main conductor portion 251 containing Cu as a main component, and an intermediate layer 252 located between the main conductor portion 251 and the inner peripheral surface of the through hole 13.
  • the wiring conductor 23 includes a main conductor portion 231 containing Cu as a main component, and an intermediate layer 232 located between the main conductor portion 231 and the second surface 12.
  • the intermediate layers 212, 232 and 252 contain Cu, Ti (titanium) and O (oxygen).
  • the main component means a component contained in an amount of 80% by mass or more.
  • the main conductor portions 211 and 231 of the wiring conductors 21 and 23, and the main conductor portion 251 of the through conductor 25 are polycrystalline metals in which a plurality of Cu crystal grains t1 are gathered.
  • Cu crystal grains t1 are schematically drawn.
  • the actual Cu crystal grain t1 has various shapes such as granular and columnar, and has variations in size.
  • the intermediate layers 212 and 232 of the wiring conductors 21 and 23 and the intermediate layer 252 of the through conductor 25 are polycrystalline metals in which a plurality of Cu crystal grains and a plurality of titanium oxide crystal grains are gathered.
  • the sizes of the Cu crystal grains t1 of the wiring conductors 21 and 23, the Cu crystal grains t1 of the through conductor 25, and the Cu crystal grains of the intermediate layers 212, 232, and 252 will be described.
  • the Cu crystal grains t1 of the wiring conductors 21 and 23 and the Cu crystal grains t1 of the through conductor 25 are simply referred to, they mean the Cu crystal grains t1 of the main conductor portions 211, 231 and 251.
  • the size of Cu crystal grains is a size expressed in units of length.
  • the wiring conductor 21 and the through conductor 25 are distinguished by the difference in the average size of the Cu crystal grains t1 and the difference in the average size.
  • the average size of the Cu crystal grains t1 of the through conductor 25 is larger than the average size of the Cu crystal grains t1 of the wiring conductor 21.
  • the difference in the average size of the Cu crystal grains t1 is a level difference that exceeds the error.
  • the difference at a level exceeding the error may mean a difference of 1.5 times or more or 2 times or more of the standard deviation ⁇ of the size of the Cu crystal grain t1 measured at an arbitrary portion.
  • Electromigration tends to occur around the opening 13a of the through hole 13 where the direction of the current changes and the current concentrates when the electric charge flows from the wiring conductor 21 to the through conductor 25.
  • the Cu crystal grains t1 of the through conductor 25 is larger than the average size of the Cu crystal grains t1 of the wiring conductor 21, the Cu crystal grains t1 become difficult to move in the through conductor 25 and penetrate.
  • the resistance to electromigration around the opening 13a of the hole 13 can be improved.
  • the difference between the average size of the Cu crystal grains t1 of the through conductor 25 and the average size of the Cu crystal grains t1 of the wiring conductor 21 is 3 ⁇ m or less. With this configuration, the difference in size of the Cu crystal grains t1 at the boundary between the wiring conductor 21 and the through conductor 25 becomes small, so that the resistance to electromigration can be improved even at the boundary.
  • the average size of the Cu crystal grains t1 of the through conductor 25 may be larger than the average size of the Cu crystal grains t1 of the wiring conductor 23 on the second surface 12 side.
  • the difference in average magnitude is a level difference that exceeds the error and may be 3 ⁇ m or less.
  • FIG. 3 is a diagram illustrating a method for measuring the size of Cu crystal grains.
  • the Cu crystal grains t1 are simplified, and the number of Cu crystal grains t1 in the target region Rt is different from the actual number. 1.
  • the SEM Sccanning Electron Microscope image or SIM (Scanning Ion Microscope) image
  • the boundary (grain boundary) line of each Cu crystal grain t1 is extracted. 2.
  • a region having a size including 20 to 100 Cu crystal grains t1 is arbitrarily selected as the target region Rt.
  • the target region Rt is selected from a plurality of main portions of the conductor to be measured (main conductor portion 251 for the through conductor 25, main conductor portions 211 and 231 for the wiring conductors 21 and 23). 3.
  • the number of Cu crystal grains t1 in each target region Rt is counted, and the area of each target region Rt is divided by the above number to calculate the average cross-sectional area of one Cu crystal grain t1. Further, assuming that the cross-sectional shape of each Cu crystal grain t1 is a circle, the diameter of the circle is calculated from the area, and the diameter is obtained as the average size of the Cu crystal grains t1.
  • Example> When the average size of the Cu crystal grains t1 was measured for the through conductor 25 and the wiring conductor 21 for the wiring board 1 of the embodiment of the present disclosure, the result of the measurement result 1 was obtained.
  • the result shows that the average size of the Cu crystal grains t1 of the through conductor 25 is larger than the average size of the Cu crystal grains t1 of the wiring conductor 21, and the difference between the two is 3 ⁇ m or less.
  • FIG. 4A and 4B are views for explaining the boundary between the wiring conductor and the through conductor
  • FIG. 4A is a cross-sectional view of a main part of the wiring board
  • FIG. 4B is a plan view of the main part.
  • the cross section of FIG. 4A is a cross section that passes through the through hole 13 and is perpendicular to the first surface 11.
  • a large number of target regions Rt are set around the opening 13a of the through hole 13, the average size of Cu crystal grains t1 is measured for each target region Rt, and a boundary line in which the average size changes stepwise (FIG. By extracting (shown by a alternate long and short dash line in 4A), the boundary line can be specified as the boundary E1 between the through conductor 25 and the wiring conductor 21.
  • the boundary E1 may be located outside the through hole 13 (that is, outside the opening 13a of the through hole 13) in the cross section of FIG. 4A. All of the boundaries E1 may be located outside the through holes 13. Electromigration tends to occur around the opening 13a of the through hole 13 in which the direction of the current changes and the current concentrates when the electric charge flows from the wiring conductor 21 to the through conductor 25. However, due to the configuration of the boundary E1 described above, the Cu crystal grains t1 of the through conductor 25 occupy the inside and outside of the opening 13a, so that the difference in size of the Cu crystal grains t1 between the inside and outside of the opening 13a becomes small. .. Therefore, the resistance to electromigration can be improved around the opening 13a of the through hole 13.
  • the boundary E1 has the same tendency regardless of the orientation of the cross section (the orientation in the rotation direction about the central axis of the through hole 13). Therefore, when the wiring board 1 is seen through from the direction perpendicular to the first surface 11, the boundary E1 has a portion overlapping with the opening 13a of the through hole 13 of the insulating board 10, as shown in FIG. 4B. In the range having the above overlap, the difference in size of the Cu crystal grains t1 between the inside and the outside of the opening 13a becomes small. Therefore, with this configuration, the resistance to electromigration can be improved around the opening 13a of the through hole 13.
  • the boundary E1 may overlap with the opening 13a in the entire circumferential direction of the opening 13a of the through hole 13. With this configuration, the resistance to electromigration can be improved over the entire circumferential direction of the opening 13a of the through hole 13.
  • the boundary E1 includes the left first boundary line E1a and the right second boundary line E1b, and the distance between the first boundary line E1a and the second boundary line E1b penetrates.
  • the distance from the hole 13 (opening 13a) may be narrower.
  • the width of the through conductor 25 may be narrowed as it is separated from the through hole 13 (opening 13a).
  • the angle between each portion of the boundary E1 and the line segment indicating the opening 13a may become smaller as it is closer to the edge of the opening 13a.
  • the boundary E1 between the wiring conductor 23 and the through conductor 25 may be the same as the relationship between the boundary E1 on the first surface 11 side and the opening 13a in the relationship with the opening 13b on the second surface 12 side.
  • the intermediate layers 212, 232, and 252 are polycrystalline metals containing at least Cu, Ti, and O, in which a plurality of Cu crystal grains and a plurality of titanium oxide crystal grains are gathered. Comparing the intermediate layer 252 of the through conductor 25 with the main conductor portion 251 of the through conductor 25, the average size of the Cu crystal grains is larger in the main conductor portion 251. Comparing the intermediate layers 212 and 232 of the wiring conductors 21 and 23 with the main conductor portions 211 and 231 of the wiring conductors 21 and 23, the average size of the Cu crystal grains is larger in the main conductor portions 211 and 231. ..
  • the components of the intermediate layers 212 and 232 of the wiring conductors 21 and 23 and the intermediate layer 252 of the through conductor 25 and the average size of the Cu crystal grains may be substantially the same.
  • FIG. 5 is a diagram illustrating an example of a method for manufacturing a wiring board according to an embodiment.
  • the manufacturing method of the present embodiment includes a substrate forming step J1, a Ti film coating step J2, a firing step J3, a Cu plating and sinter step J4, an electrolytic plating step J5, and a resist peeling step J6 in chronological order.
  • the ceramic green sheet which is a ceramic before sintering, is formed into a substrate shape by punching or die processing, and the substrate 70 before firing is formed.
  • the substrate 70 is provided with a through hole 73 and a gutter 74 extending across the first surface 71 and the second surface 72 on the opposite side of the first surface 71.
  • the diameter of the through hole 73 at an intermediate depth is larger than the diameter of the opening of the first surface 71 and the diameter of the opening of the second surface 72. Is also formed to be small.
  • the substrate 70 becomes an insulating substrate 10 which is ceramic, and the through holes 73 and the gutters 74 of the substrate 70 before firing have the same shape as the through holes 13 and the gutters 14. It becomes.
  • the through holes 13 and the gutters 14 may be formed by a method such as laser or blasting.
  • the organic Ti liquid 81 is coated on the fired insulating substrate 10.
  • the organic Ti liquid 81 is also applied to the inner wall surfaces of the through hole 73 and the gutter 74.
  • the organic Ti liquid 81 may be applied to the first surface 71, the second surface 72, the inner wall surface of the through hole 73, and the inner wall surface of the gutter 74 with the same thickness.
  • the organic Ti liquid 81 applied to the insulating substrate 10 is fired, so that the applied organic Ti liquid 81 becomes the oxidized Ti film 83.
  • the Cu plating and sinter step J4 first, electroless Cu plating is applied on the Ti oxide film 83 on the surface of the insulating substrate 10, and then the sinter that diffuses the elements at the interface between the Ti oxide film 83 and the Cu plating film. Processing is done. By the sinter treatment, Cu is diffused in the Ti oxide film 83 to form the seed layer 85.
  • the seed layer 85 corresponds to the intermediate layers 212, 232, and 252 in the wiring board 1 after the manufacturing process.
  • the resist pattern 91 is formed so as to exclude the portions of the wiring conductors 21 and 23 and the through conductor 25, and electrolytic Cu plating is applied on the seed layer 85 not covered with the resist pattern 91.
  • electrolytic Cu plating a Cu precipitation conductor 88 is formed on the seed layer 85, and the through holes 13 and the gutters 14 are filled with the Cu precipitation conductor 88.
  • the Cu precipitation conductor 88 corresponds to the main conductor portions 211 and 231 of the wiring conductors 21 and 23, and the main conductor portion 251 of the through conductor 25.
  • a through hole containing copper sulfate and a plating solution for beer filling (for example, VF-II manufactured by JCU Co., Ltd.) can be used.
  • a Cu precipitation conductor is placed in a conductive rack, degreased, acid-treated, etc., then immersed in a plating solution and a current of about 0.5 to 3.0 A / dm 2 is applied. 88 is formed.
  • the resist pattern 91 is removed, and the seed layer 85 not covered with the Cu precipitation conductor 88 is etched to manufacture the wiring board 1.
  • the wiring board 1 it is possible to manufacture the wiring board 1 in which the average size of the Cu crystal grains t1 differs between the wiring conductors 21 and 23 and the through conductor 25 as described above.
  • wiring conductors 21a and 21b and castings 25a and 25b are added to the configuration of FIG.
  • FIG. 6 is a cross-sectional view showing an electronic device and an electronic module according to the embodiment of the present disclosure.
  • the electronic device 60 is configured by mounting an electronic component 50 on a wiring board 1.
  • the terminal of the electronic component 50 may be connected to the wiring conductor 21, and the terminal may be conducted to the wiring conductor 23 on the second surface 12 side via the wiring conductor 21 and the through conductor 25.
  • a Ni film may be provided on the surfaces of the wiring conductors 21 and 23.
  • Examples of the electronic component 50 include optical elements such as LD (LaserDiode), PD (PhotoDeode), LED (LightEmittingDiode), and image pickup elements such as CCD (ChargeCoupledDevice) type and CMOS (ComplementaryMetalOxideSemiconductor) type.
  • Various electronic components such as piezoelectric vibrators such as crystal transducers, elastic surface wave elements, semiconductor elements such as semiconductor integrated circuit elements (ICs: Integrated Circuits), electric capacity elements, inductor elements, and resistors can be applied.
  • the electronic module 100 is configured by mounting an electronic device 60 on a module board 110.
  • other electronic devices, electronic elements, electric elements, and the like may be mounted on the module substrate 110.
  • An electrode pad 111 may be provided on the module substrate 110, and the wiring conductor 23 of the electronic device 60 may be joined to the electrode pad 111 via a bonding material 113 such as solder.
  • the reliability of the electronic device 60 and the electronic module 100 is improved by providing the wiring board 1 having improved resistance to electromigration around the opening 13a. Can be done.
  • the wiring board, the electronic device, and the electronic module of the present disclosure are not limited to the above embodiment.
  • the wiring conductor is exposed on the outer surface of the wiring board, and the through conductor is located between the two wiring conductors exposed on the outer surface of the wiring board.
  • the wiring layer is located inside the substrate, and the through conductor may be an interlayer via of the multilayer wiring substrate.
  • the through conductor may be a conductor constituting a through hole or a conductor constituting a casting.
  • This disclosure can be used for wiring boards, electronic devices and electronic modules.

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Abstract

配線基板は、第１面と、第１面とは反対の第２面と、第１面から第２面にわたる貫通孔と、を有する絶縁基板、貫通孔内及び第１面側の貫通孔の開口上に位置する貫通導体、並びに、第１面に位置し貫通導体と繋がる配線導体を備える。そして、貫通導体及び配線導体は主成分として銅を含み、貫通導体におけるＣｕ結晶粒の平均の大きさが、配線導体におけるＣｕ結晶粒の平均の大きさよりも大きい。

Description

配線基板、電子装置及び電子モジュール
　本開示は、配線基板、電子装置及び電子モジュールに関する。
　通電に伴う導体原子の移動により、配線基板の導体に欠損が生じるエレクトロマイグレーションと呼ばれる現象がある。国際公開第２００８／０８４８６７号には、配線基板の配線をシード層と貴金属のライナー層と銅配線膜とから構成することで、エレクトロマイグレーション耐性を向上した半導体装置が示されている。
　本開示に係る配線基板は、
　第１面と、前記第１面とは反対の第２面と、前記第１面から前記第２面にわたる貫通孔と、を有する絶縁基板と、
　前記貫通孔内及び前記第１面側の前記貫通孔の開口上に位置する貫通導体と、
　前記第１面に位置し前記貫通導体と繋がる配線導体と、
　を備え、
　前記貫通導体及び前記配線導体は主成分として銅を含み、
　前記貫通導体におけるＣｕ結晶粒の平均の大きさが、前記配線導体におけるＣｕ結晶粒の平均の大きさよりも大きい。
　本開示に係る電子装置は、
　上記の配線基板と、
　前記配線基板に搭載された電子部品と、
　を備える。
　本開示に係る電子モジュールは、
　上記の電子装置と、
　前記電子装置が搭載されるモジュール用基板と、
　を備える。
本開示の実施形態に係る配線基板を示す斜視図である。 図１の配線基板の要部を示す断面図である。 Ｃｕ結晶粒の大きさの計測方法を説明する図である。 配線基板の要部を示す断面図である。 配線基板の要部を示す平面図である。 実施形態に係る配線基板の製造方法の一例を示す説明図である。 本開示の実施形態に係る電子装置及び電子モジュールを示す図である。
　以下、本開示の実施形態について図面を参照して詳細に説明する。図１は、本開示の実施形態に係る配線基板を示す斜視図である。図２は、図１の配線基板の要部を示す断面図である。図２は、配線基板１の貫通導体２５が位置する部分の断面を示す。
　本実施形態の配線基板１は、第１面１１、第１面１１の反対側の第２面１２、並びに第１面１１から第２面１２にわたる貫通孔１３を有する絶縁基板１０と、第１面１１に位置する配線導体２１と、貫通孔１３及び貫通孔１３の開口１３ａ上に位置する貫通導体２５と、第２面１２に位置する配線導体２３とを備える。貫通導体２５は、第２面１２側の開口１３ｂ上（貫通孔１３とは逆の方）にも位置する。貫通導体２５は、配線導体２１、２３と繋がっている。
　絶縁基板１０は、窒化アルミ、窒化ケイ素、炭化ケイ素、アルミナ、ジルコニア等を主成分とするセラミックから構成されてもよい。
　貫通孔１３は、図２に一点鎖線で示すように、第１面１１側の開口１３ａと第２面１２側の開口１３ｂとを有する。貫通孔１３及び開口１３ａ、１３ｂは、貫通導体２５が位置するので、空間が開いているわけではない。開口１３ａ及び開口１３ｂの各内径は貫通孔１３の中間部１３ｉの内径よりも大きい。中間部１３ｉとは、開口１３ａと開口１３ｂとの間における第１面１１に平行な貫通孔１３内の平面部を意味する。中間部１３ｉから第１面１１側の開口１３ａにかけて貫通孔１３の内径が漸次大きくなっていてもよい。同様に、中間部１３ｉから第２面１２側の開口１３ｂにかけて貫通孔１３の内径が漸次大きくなっていてもよい。当該構成により、配線基板１の製造段階で、貫通孔１３に充填される貫通導体２５のＣｕ結晶粒ｔ１の制御が容易となる。
　なお、貫通孔１３は、断面形状（第１面１１に平行な断面形状）が円形である必要はなく、円形以外である場合、上記の「内径」は「最大幅」と読み替えればよい。
　配線導体２１は、Ｃｕ（銅）を主成分とする主導体部２１１と、主導体部２１１と第１面１１との間に位置する中間層２１２とを含む。貫通導体２５は、Ｃｕを主成分とする主導体部２５１と、主導体部２５１と貫通孔１３の内周面との間に位置する中間層２５２とを含む。配線導体２３は、Ｃｕを主成分とする主導体部２３１と、主導体部２３１と第２面１２との間に位置する中間層２３２とを含む。中間層２１２、２３２、２５２は、Ｃｕ、Ｔｉ（チタン）、Ｏ（酸素）を含む。なお、主成分とは８０質量％以上含まれる成分を意味する。
　配線導体２１、２３の主導体部２１１、２３１、並びに、貫通導体２５の主導体部２５１は、複数のＣｕ結晶粒ｔ１が集まった多結晶金属である。図２、図３、図４Ａ及び図４Ｂでは、Ｃｕ結晶粒ｔ１を模式的に描いている。実際のＣｕ結晶粒ｔ１は、粒状、柱状など様々な形状を有し、大きさについてバラツキを有する。
　配線導体２１、２３の中間層２１２、２３２、並びに、貫通導体２５の中間層２５２は、複数のＣｕ結晶粒と複数のチタン酸化物の結晶粒とが集まった多結晶金属である。
　＜Ｃｕ結晶粒の大きさ＞
　続いて、配線導体２１、２３のＣｕ結晶粒ｔ１、貫通導体２５のＣｕ結晶粒ｔ１、中間層２１２、２３２、２５２のＣｕ結晶粒の大きさについて説明する。以下、単に配線導体２１、２３のＣｕ結晶粒ｔ１、貫通導体２５のＣｕ結晶粒ｔ１と言ったときには、主導体部２１１、２３１、２５１のＣｕ結晶粒ｔ１を意味するものとする。また、Ｃｕ結晶粒の大きさとは、長さの単位で表わされる大きさとする。
　配線導体２１と貫通導体２５とは、Ｃｕ結晶粒ｔ１の平均の大きさが異なり、平均の大きさが異なることで区別される。貫通導体２５のＣｕ結晶粒ｔ１の平均の大きさは、配線導体２１のＣｕ結晶粒ｔ１の平均の大きさよりも大きい。Ｃｕ結晶粒ｔ１の平均の大きさの差は、誤差を上回るレベルの差である。誤差を上回るレベルの差とは、任意の部分で計測されたＣｕ結晶粒ｔ１の大きさの標準偏差σの１．５倍以上や２倍以上の差を意味してもよい。
　エレクトロマイグレーションは、配線導体２１から貫通導体２５へ電荷が流れる際に電流の向きが変わりかつ電流が集中する貫通孔１３の開口１３ａ周辺で生じやすい。しかし、貫通導体２５のＣｕ結晶粒ｔ１の平均の大きさが、配線導体２１のＣｕ結晶粒ｔ１の平均の大きさよりも大きいことで、貫通導体２５においてＣｕ結晶粒ｔ１が移動し難くなり、貫通孔１３の開口１３ａ周辺のエレクトロマイグレーション耐性を向上できる。
　さらに、貫通導体２５のＣｕ結晶粒ｔ１の平均の大きさと、配線導体２１のＣｕ結晶粒ｔ１の平均の大きさとの差は、３μｍ以下である。当該構成により、配線導体２１と貫通導体２５との境界においてＣｕ結晶粒ｔ１の大きさの差が小さくなることで、当該境界においてもエレクトロマイグレーションの耐性を向上することができる。
　以上、第１面１１側について説明したが、第２面１２側においても同様であってよい。すなわち、貫通導体２５のＣｕ結晶粒ｔ１の平均の大きさは、第２面１２側の配線導体２３のＣｕ結晶粒ｔ１の平均の大きさよりも大きくてもよい。平均の大きさの差は、誤差を上回るレベルの差であり、かつ、３μｍ以下であってもよい。当該構成により、第２面１２側においても、配線導体２３から貫通導体２５へ電荷が流れる際に開口１３ｂの周辺で生じやすいエレクトロマイグレーションに対して、当該エレクトロマイグレーションの耐性を向上することができる。
　Ｃｕ結晶粒ｔ１は、粒状、柱状など様々な形状を有するため、各Ｃｕ結晶粒ｔ１の平均の大きさは、次の１～３の手順により求める。図３は、Ｃｕ結晶粒の大きさの計測方法を説明する図である。図３ではＣｕ結晶粒ｔ１が簡略化されており、対象領域Ｒｔ内のＣｕ結晶粒ｔ１の数は実際と異なっている。
１．貫通導体２５及び配線導体２１を含む断面のＳＥＭ（Scanning Electron Microscope画像、又はＳＩＭ（Scanning Ion Microscope）画像において、各Ｃｕ結晶粒ｔ１の境界（粒界）線を抽出する。
２．上記の画像から２０個～１００個のＣｕ結晶粒ｔ１が含まれる大きさの領域を、対象領域Ｒｔとして任意に選ぶ。対象領域Ｒｔは、計測対象の導体の主部（貫通導体２５であれば主導体部２５１、配線導体２１、２３であれば主導体部２１１、２３１）から複数箇所選ぶ。
３．各対象領域Ｒｔ内のＣｕ結晶粒ｔ１の個数を計数し、各対象領域Ｒｔの面積を上記個数で除算することで、１つのＣｕ結晶粒ｔ１の断面面積の平均を計算する。さらに、各Ｃｕ結晶粒ｔ１の断面形状が円であるものと仮定し、上記面積から上記円の直径を計算し、当該直径をＣｕ結晶粒ｔ１の平均の大きさとして求める。
　＜実施例＞
　本開示の一実施例の配線基板１について貫通導体２５と配線導体２１とについてＣｕ結晶粒ｔ１の平均の大きさを計測すると、計測結果１の結果が得られた。
Figure JPOXMLDOC01-appb-T000001
 　当該結果は、貫通導体２５のＣｕ結晶粒ｔ１の平均の大きさが、配線導体２１のＣｕ結晶粒ｔ１の平均の大きさよりも大きく、両者の差が３μｍ以下であることを示している。
　＜配線導体と貫通導体との境界＞
　図４Ａ及び図４Ｂは、配線導体と貫通導体との境界を説明する図であり、図４Ａは配線基板の要部断面図、図４Ｂは当該要部の平面図である。図４Ａの断面は、貫通孔１３を通りかつ第１面１１に垂直な断面である。
　貫通孔１３の開口１３ａの周辺において多数の対象領域Ｒｔを設定し、各対象領域ＲｔについてＣｕ結晶粒ｔ１の平均の大きさを計測し、平均の大きさが段階状に変化する境界線（図４Ａに一点鎖線で示す）を抽出することで、当該境界線を貫通導体２５と配線導体２１との境界Ｅ１として特定することができる。
　境界Ｅ１は、図４Ａの断面において、貫通孔１３の外（すなわち貫通孔１３の開口１３ａよりも外）に位置してもよい。境界Ｅ１の全てが、貫通孔１３の外に位置してもよい。エレクトロマイグレーションは、配線導体２１から貫通導体２５へ電荷が流れる際に電流の向きが変わりかつ電流が集中する貫通孔１３の開口１３ａ周辺で生じやすい。しかし、上記の境界Ｅ１の構成により、開口１３ａの内と外とに貫通導体２５のＣｕ結晶粒ｔ１が占めるため、開口１３ａの内と外とでＣｕ結晶粒ｔ１の大きさの差が小さくなる。したがって、貫通孔１３の開口１３ａ周辺でエレクトロマイグレーションの耐性を向上することができる。
　境界Ｅ１は、断面の向き（貫通孔１３の中心軸を中心とする回転方向の向き）に依らず同様の傾向を有する。したがって、配線基板１を第１面１１に垂直な方向から透視すると、図４Ｂに示すように、境界Ｅ１は絶縁基板１０の貫通孔１３の開口１３ａと重なる部分を有する。上記の重なりを有する範囲において開口１３ａの内と外とでＣｕ結晶粒ｔ１の大きさの差が小さくなる。したがって、当該構成により、貫通孔１３の開口１３ａ周辺でエレクトロマイグレーションの耐性を向上することができる。境界Ｅ１は、貫通孔１３の開口１３ａの周方向の全域において、開口１３ａと重なっていてもよい。当該構成により、貫通孔１３の開口１３ａの周方向の全域においてエレクトロマイグレーションの耐性を向上できる。
　さらに、図４Ａの断面において、境界Ｅ１は、左方の第１境界線Ｅ１ａと右方の第２境界線Ｅ１ｂとを含み、第１境界線Ｅ１ａと第２境界線Ｅ１ｂとの間隔は、貫通孔１３（開口１３ａ）から離れるほど狭くなってもよい。また、貫通導体２５の幅が貫通孔１３（開口１３ａ）から離れるほど狭くなってもよい。当該構成により、配線導体２１から貫通導体２５に電荷が流れる際に電流の向きが変わりかつ電流が集中する箇所においてＣｕ結晶粒ｔ１の大きさの差を小さくすることができる。したがって、当該箇所におけるエレクトロマイグレーションの耐性を向上できる。さらに、上記断面において、境界Ｅ１の各部と開口１３ａを示す線分との角度が、開口１３ａの縁に近いほど小さくなってもよい。当該構成により、電荷の向きが変わりかつ電荷の流れが集中する箇所においてＣｕ結晶粒ｔ１の大きさの差を小さくすることができる。したがって、当該箇所におけるエレクトロマイグレーションの耐性を向上できる。
　以上、第１面１１側について説明したが、第２面１２側においても同様であってもよい。すなわち、配線導体２３と貫通導体２５との境界Ｅ１は、第２面１２側の開口１３ｂとの関係において、第１面１１側の境界Ｅ１と開口１３ａとの関係と同様であってもよい。当該構成により、配線導体２３から貫通導体２５へ電荷が流れる場合に、電荷の向きが変わりかつ電荷の流れが集中する箇所においてＣｕ結晶粒ｔ１の大きさの差を小さくすることができる。したがって、当該箇所におけるエレクトロマイグレーションの耐性を向上できる。
　＜中間層＞
　中間層２１２、２３２、２５２は、先にも述べたように、少なくともＣｕ、Ｔｉ、Ｏを含み、複数のＣｕ結晶粒と複数のチタン酸化物の結晶粒とが集まった多結晶金属である。貫通導体２５の中間層２５２と、貫通導体２５の主導体部２５１とを比較すると、Ｃｕ結晶粒の平均の大きさは、主導体部２５１の方が大きい。配線導体２１、２３の中間層２１２、２３２と、配線導体２１、２３の主導体部２１１、２３１とを比較すると、Ｃｕ結晶粒の平均の大きさは、主導体部２１１、２３１の方が大きい。
　配線導体２１、２３の中間層２１２、２３２と、貫通導体２５の中間層２５２とは、成分、並びに、Ｃｕ結晶粒の平均の大きさは、ほぼ同一であってもよい。
　中間層２１２、２３２、２５２が介在することで、絶縁基板１０と配線導体２１、２３との間、並びに、絶縁基板１０と貫通導体２５との間に熱応力が生じた場合でも、熱応力の集中が緩和され、配線基板１のＴＣＴ（温度サイクル試験）耐性を向上できる。
　＜製造方法＞
　図５は、実施形態に係る配線基板の製造方法の一例を説明する図である。
　本実施形態の製造方法は、時系列順に、絶縁基板１０の基板成形工程Ｊ１、Ｔｉ膜塗布工程Ｊ２、焼成工程Ｊ３、Ｃｕめっき及びシンター工程Ｊ４、電解めっき工程Ｊ５、レジスト剥離工程Ｊ６を含む。
　基板成形工程Ｊ１では、焼結前のセラミックであるセラミックグリーンシートが、打ち抜き加工又は金型加工などにより基板形状に成形され、焼成前の基板７０が形成される。基板７０には、第１面７１と第１面７１の反対側の第２面７２に渡る貫通孔７３及び側溝７４が設けられる。貫通孔７３は、中間の深さ（第１面７１と第２面７２との間の高さ）の径が、第１面７１の開口の径、並びに、第２面７２の開口の径よりも小さくなるように形成される。続いて、基板７０が焼成されることで、当該基板７０がセラミックである絶縁基板１０となり、焼成前の基板７０の貫通孔７３及び側溝７４が、同様の形状のまま、貫通孔１３及び側溝１４となる。なお、セラミックグリーンシートを焼成した後、レーザーまたはブラスト処理などの手法により貫通孔１３及び側溝１４を形成してもよい。
　Ｔｉ膜塗布工程Ｊ２では、焼成された絶縁基板１０に有機Ｔｉ液８１が塗布される。有機Ｔｉ液８１は、貫通孔７３及び側溝７４の内壁面にも塗布される。有機Ｔｉ液８１は、第１面７１、第２面７２、貫通孔７３の内壁面、並びに、側溝７４の内壁面に、同等の厚みで塗布されてもよい。
　焼成工程Ｊ３では、絶縁基板１０に塗布した有機Ｔｉ液８１が焼成されることで、塗布された有機Ｔｉ液８１が酸化Ｔｉ膜８３となる。
　Ｃｕメッキ及びシンター工程Ｊ４では、まず、絶縁基板１０の表面の酸化Ｔｉ膜８３上に無電解Ｃｕメッキが施され、次に、酸化Ｔｉ膜８３とＣｕめっき膜との界面の元素を拡散させるシンター処理が行われる。シンター処理により、酸化Ｔｉ膜８３にＣｕが拡散し、シード層８５が形成される。シード層８５は、製造工程後の配線基板１における中間層２１２、２３２、２５２に相当する。
　電解めっき工程Ｊ５では、配線導体２１、２３及び貫通導体２５の部位を除くようにレジストパターン９１が形成され、レジストパターン９１で覆われていないシード層８５上に電解Ｃｕめっきが施される。電解Ｃｕめっきにより、シード層８５上にＣｕ析出導体８８が形成され、貫通孔１３及び側溝１４がＣｕ析出導体８８で充填される。Ｃｕ析出導体８８は、配線導体２１、２３の主導体部２１１、２３１、並びに、貫通導体２５の主導体部２５１に相当する。電解Ｃｕめっきは、硫酸銅を含有するスルーホール、ビアフィリング用のめっき液（例えば、（株)JCU製　VF-II）を用いることができる。導通可能なラックに基板を設置し、基板に脱脂、酸処理などを実施後、基板をめっき液に浸漬し、０．５～３．０Ａ／ｄｍ２程度の電流を印加することでＣｕ析出導体８８が形成される。
　レジスト剥離工程Ｊ６では、レジストパターン９１が除去され、Ｃｕ析出導体８８に覆われていないシード層８５がエッチングされることで、配線基板１が製造される。上記の製造方法により、配線導体２１、２３と貫通導体２５とでＣｕ結晶粒ｔ１の平均の大きさが前述したように異なる配線基板１を製造できる。図５の配線基板１は、図１の構成に、配線導体２１ａ、２１ｂとキャスタレーション２５ａ、２５ｂが追加されている。
　＜電子装置及び電子モジュール＞
　図６は、本開示の実施形態に係る電子装置及び電子モジュールを示す断面図である。
　本実施形態に係る電子装置６０は、配線基板１に電子部品５０が実装されて構成される。電子部品５０の端子が配線導体２１に接続され、当該端子が配線導体２１及び貫通導体２５を介して第２面１２側の配線導体２３に導通されてもよい。配線導体２１、２３の表面にはＮｉ膜が設けられていてもよい。
　電子部品５０としては、ＬＤ（Laser Diode）、ＰＤ（Photo Diode）、ＬＥＤ（Light Emitting Diode）等の光素子、ＣＣＤ（Charge Coupled Device）型、ＣＭＯＳ（Complementary Metal Oxide Semiconductor）型等の撮像素子、水晶振動子等の圧電振動子、弾性表面波素子、半導体集積回路素子（ＩＣ：Integrated Circuit）等の半導体素子、電気容量素子、インダクタ素子又は抵抗器等の種々の電子部品を適用できる。
　本実施形態に係る電子モジュール１００は、モジュール用基板１１０に電子装置６０を実装して構成される。モジュール用基板１１０には、電子装置６０に加えて、他の電子装置、電子素子及び電気素子などが実装されていてもよい。モジュール用基板１１０には電極パッド１１１が設けられ、電子装置６０の配線導体２３が、電極パッド１１１に半田等の接合材１１３を介して接合されてもよい。
　本実施形態の電子装置６０及び電子モジュール１００によれば、開口１３ａの周辺におけるエレクトロマイグレーションの耐性が向上された配線基板１を備えることで、電子装置６０及び電子モジュール１００の信頼性を向上することができる。
　以上、本開示の実施形態について説明した。しかし、本開示の配線基板、電子装置及び電子モジュールは上記実施形態に限られるものでない。例えば、上記実施形態では、配線導体は配線基板の外面に露出し、貫通導体は配線基板の外面に露出した２つの配線導体の間に位置する構成を示したが、配線導体は、多層配線基板の基板内部に位置する配線層であり、貫通導体は、多層配線基板の層間ビアであってもよい。また、貫通導体は、スルーホールを構成する導体であってもよいし、キャスタレーションを構成する導体であってもよい。
　本開示は、配線基板、電子装置及び電子モジュールに利用できる。
　１　配線基板
　１０　絶縁基板
　１１　第１面
　１２　第２面
　１３　貫通孔
　１３ａ、１３ｂ　開口
　１３ｉ　中間部
　２１、２３　配線導体
　２５　貫通導体
　２１１、２３１、２５１　主導体部
　２１２、２３２、２５２　中間層
　ｔ１　Ｃｕ結晶粒
　Ｅ１　境界
　Ｅ１ａ　第１境界線
　Ｅ１ｂ　第２境界線
　５０　電子部品
　６０　電子装置
　１００　電子モジュール
　１１０　モジュール用基板

Claims (8)

  1. 　第１面と、前記第１面とは反対の第２面と、前記第１面から前記第２面にわたる貫通孔と、を有する絶縁基板と、
    　前記貫通孔内及び前記第１面側の前記貫通孔の開口上に位置する貫通導体と、
    　前記第１面に位置し前記貫通導体と繋がる配線導体と、
    　を備え、
    　前記貫通導体及び前記配線導体は主成分として銅を含み、
    　前記貫通導体におけるＣｕ結晶粒の平均の大きさが、前記配線導体におけるＣｕ結晶粒の平均の大きさよりも大きい、
    　配線基板。
  2. 　前記貫通導体におけるＣｕ結晶粒の平均の大きさと、前記配線導体におけるＣｕ結晶粒の平均の大きさとの差が３μｍ以下である、
    　請求項１記載の配線基板。
  3. 　前記貫通導体と前記配線導体との境界が、前記貫通孔の外に位置する、
    　請求項１又は請求項２記載の配線基板。
  4. 　前記第１面に垂直な方向から透視したとき、前記貫通導体と前記配線導体との境界は、前記貫通導体と重なる部分を含む、
    　請求項１から請求項３のいずれか一項に記載の配線基板。
  5. 　前記貫通孔を通り前記第１面に垂直な断面において、前記貫通導体と前記配線導体との左方の境界を示す第１境界線と、前記貫通導体と前記配線導体との右方の境界を示す第２境界線との間隔が、前記貫通孔から離れるほど狭い、
    　請求項１から請求項４のいずれか一項に記載の配線基板。
  6. 　前記貫通孔を通り前記第１面に垂直な断面において、前記貫通導体と前記配線導体との境界を示す境界線の各部と、前記貫通孔の開口を示す断面上の線分との角度が、前記開口の縁に近いほど小さい、
    　請求項１から請求項５のいずれか一項に記載の配線基板。
  7. 　請求項１から請求項６のいずれか一項に記載の配線基板と、
    　前記配線基板に搭載された電子部品と、
    　を備える電子装置。
  8. 　請求項７に記載の電子装置と、
    　前記電子装置が搭載されるモジュール用基板と、
    　を備える電子モジュール。
PCT/JP2021/039572 2020-10-30 2021-10-27 配線基板、電子装置及び電子モジュール Ceased WO2022092129A1 (ja)

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WO2025028321A1 (ja) * 2023-07-31 2025-02-06 京セラ株式会社 配線基板、電子装置及び電子モジュール

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