WO2014097880A1 - パワーモジュール用基板の製造方法 - Google Patents
パワーモジュール用基板の製造方法 Download PDFInfo
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- WO2014097880A1 WO2014097880A1 PCT/JP2013/082449 JP2013082449W WO2014097880A1 WO 2014097880 A1 WO2014097880 A1 WO 2014097880A1 JP 2013082449 W JP2013082449 W JP 2013082449W WO 2014097880 A1 WO2014097880 A1 WO 2014097880A1
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- Prior art keywords
- ceramic substrate
- heat dissipation
- dissipation layer
- circuit layer
- substrate
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- 239000000758 substrate Substances 0.000 title claims abstract description 114
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 18
- 239000000919 ceramic Substances 0.000 claims abstract description 87
- 230000017525 heat dissipation Effects 0.000 claims abstract description 57
- 238000005219 brazing Methods 0.000 claims abstract description 22
- 238000004381 surface treatment Methods 0.000 claims abstract description 21
- 238000005304 joining Methods 0.000 claims abstract description 18
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 14
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910052802 copper Inorganic materials 0.000 claims abstract description 11
- 239000010949 copper Substances 0.000 claims abstract description 11
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 10
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 20
- 230000002093 peripheral effect Effects 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 13
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 8
- 239000002253 acid Substances 0.000 claims description 8
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 6
- 229910017604 nitric acid Inorganic materials 0.000 claims description 6
- 150000007513 acids Chemical class 0.000 claims description 3
- 238000000926 separation method Methods 0.000 abstract description 4
- 238000010438 heat treatment Methods 0.000 description 15
- 229910052751 metal Inorganic materials 0.000 description 12
- 239000002184 metal Substances 0.000 description 12
- 239000000463 material Substances 0.000 description 11
- 230000004907 flux Effects 0.000 description 7
- 230000005855 radiation Effects 0.000 description 6
- 238000004833 X-ray photoelectron spectroscopy Methods 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 5
- 238000003825 pressing Methods 0.000 description 5
- 229910018125 Al-Si Inorganic materials 0.000 description 4
- 229910018520 Al—Si Inorganic materials 0.000 description 4
- 239000002585 base Substances 0.000 description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- 230000003628 erosive effect Effects 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- 230000008646 thermal stress Effects 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 238000004544 sputter deposition Methods 0.000 description 2
- 229910017944 Ag—Cu Inorganic materials 0.000 description 1
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 229910018459 Al—Ge Inorganic materials 0.000 description 1
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 229910017945 Cu—Ti Inorganic materials 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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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
- H05K3/10—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
- H05K3/20—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 by affixing prefabricated conductor pattern
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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
- H01L23/34—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements
- H01L23/36—Selection of materials, or shaping, to facilitate cooling or heating, e.g. heatsinks
- H01L23/373—Cooling facilitated by selection of materials for the device or materials for thermal expansion adaptation, e.g. carbon
- H01L23/3735—Laminates or multilayers, e.g. direct bond copper ceramic substrates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/0008—Soldering, e.g. brazing, or unsoldering specially adapted for particular articles or work
- B23K1/0016—Brazing of electronic components
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/19—Soldering, e.g. brazing, or unsoldering taking account of the properties of the materials to be soldered
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B37/00—Joining burned ceramic articles with other burned ceramic articles or other articles by heating
- C04B37/02—Joining burned ceramic articles with other burned ceramic articles or other articles by heating with metallic articles
- C04B37/023—Joining burned ceramic articles with other burned ceramic articles or other articles by heating with metallic articles characterised by the interlayer used
- C04B37/026—Joining burned ceramic articles with other burned ceramic articles or other articles by heating with metallic articles characterised by the interlayer used consisting of metals or metal salts
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- 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
- H01L21/4871—Bases, plates or heatsinks
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- C—CHEMISTRY; METALLURGY
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- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2237/00—Aspects relating to ceramic laminates or to joining of ceramic articles with other articles by heating
- C04B2237/02—Aspects relating to interlayers, e.g. used to join ceramic articles with other articles by heating
- C04B2237/12—Metallic interlayers
- C04B2237/121—Metallic interlayers based on aluminium
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- C04B2237/00—Aspects relating to ceramic laminates or to joining of ceramic articles with other articles by heating
- C04B2237/02—Aspects relating to interlayers, e.g. used to join ceramic articles with other articles by heating
- C04B2237/12—Metallic interlayers
- C04B2237/126—Metallic interlayers wherein the active component for bonding is not the largest fraction of the interlayer
- C04B2237/128—The active component for bonding being silicon
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- C04B2237/00—Aspects relating to ceramic laminates or to joining of ceramic articles with other articles by heating
- C04B2237/30—Composition of layers of ceramic laminates or of ceramic or metallic articles to be joined by heating, e.g. Si substrates
- C04B2237/32—Ceramic
- C04B2237/36—Non-oxidic
- C04B2237/365—Silicon carbide
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- C04B2237/00—Aspects relating to ceramic laminates or to joining of ceramic articles with other articles by heating
- C04B2237/30—Composition of layers of ceramic laminates or of ceramic or metallic articles to be joined by heating, e.g. Si substrates
- C04B2237/32—Ceramic
- C04B2237/36—Non-oxidic
- C04B2237/366—Aluminium nitride
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- C04B2237/00—Aspects relating to ceramic laminates or to joining of ceramic articles with other articles by heating
- C04B2237/30—Composition of layers of ceramic laminates or of ceramic or metallic articles to be joined by heating, e.g. Si substrates
- C04B2237/40—Metallic
- C04B2237/402—Aluminium
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- C—CHEMISTRY; METALLURGY
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- C04B2237/00—Aspects relating to ceramic laminates or to joining of ceramic articles with other articles by heating
- C04B2237/30—Composition of layers of ceramic laminates or of ceramic or metallic articles to be joined by heating, e.g. Si substrates
- C04B2237/40—Metallic
- C04B2237/407—Copper
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- C04B2237/00—Aspects relating to ceramic laminates or to joining of ceramic articles with other articles by heating
- C04B2237/50—Processing aspects relating to ceramic laminates or to the joining of ceramic articles with other articles by heating
- C04B2237/52—Pre-treatment of the joining surfaces, e.g. cleaning, machining
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- C—CHEMISTRY; METALLURGY
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- C04B2237/00—Aspects relating to ceramic laminates or to joining of ceramic articles with other articles by heating
- C04B2237/50—Processing aspects relating to ceramic laminates or to the joining of ceramic articles with other articles by heating
- C04B2237/70—Forming laminates or joined articles comprising layers of a specific, unusual thickness
- C04B2237/704—Forming laminates or joined articles comprising layers of a specific, unusual thickness of one or more of the ceramic layers or articles
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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
- H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
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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
- H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
- H05K2203/04—Soldering or other types of metallurgic bonding
Definitions
- the present invention relates to a method for manufacturing a power module substrate used in a semiconductor device that controls a large current and a high voltage.
- This application claims priority based on Japanese Patent Application No. 2012-275157 for which it applied on December 17, 2012, and uses the content here.
- a conventional power module substrate there is known a structure in which a metal plate serving as a circuit layer is laminated on one surface of a ceramic substrate and a metal plate serving as a heat dissipation layer is laminated on the other surface of the ceramic substrate.
- An electronic component such as a semiconductor chip is soldered on the circuit layer, and a heat sink is bonded to the heat dissipation layer.
- Patent Document 1 discloses a circuit board in which a copper plate is bonded to one surface of a ceramic substrate and an aluminum plate is bonded to the other surface.
- the ceramic substrate and the copper plate are joined by a brazing material using an active metal
- the ceramic substrate and the aluminum plate are joined by an Al—Si based brazing material.
- the joining temperature is 800 to 930 ° C.
- the joining temperature using an Al—Si based brazing material is 500 to 650 ° C.
- the present invention has been made in view of such circumstances, and an object of the present invention is to suppress the separation between the ceramic substrate and the heat dissipation layer particularly during heat sink bonding.
- the method for manufacturing a power module substrate of the present invention includes a circuit layer bonding step of brazing a circuit layer made of copper on one surface of a ceramic substrate, and a heat dissipation layer made of aluminum on the other surface of the ceramic substrate. After the heat dissipation layer bonding step for brazing, and after the circuit layer bonding step, before the heat dissipation layer bonding step, the oxide film thickness of the other surface of the ceramic substrate is set to at least the ceramic substrate and the heat dissipation layer.
- a surface treatment step at a peripheral edge of the planned bonding region of 3.2 nm or less, and the ceramic substrate, the circuit layer bonded to the one surface of the ceramic substrate, and the ceramic substrate A power module substrate having the heat dissipation layer bonded to the other surface is manufactured.
- the thickness of the oxide film is set to 3.2 nm or less at the peripheral portion of the region where the ceramic substrate and the heat dissipation layer are to be bonded, so that the bonding interface between the ceramic substrate and the heat dissipation layer is reduced. Separation can be reduced. Furthermore, in the case of brazing using a flux, erosion to the bonding interface between the ceramic substrate and the heat dissipation layer due to the flux can be suppressed.
- the other surface of the ceramic substrate may be washed with one or more acids selected from hydrochloric acid, nitric acid, and sulfuric acid.
- hydrochloric acid has a particularly weak oxidizing action and does not erode even if it adheres to the circuit layer. Therefore, it is suitable for the surface treatment for removing the oxide film.
- the ceramic substrate is subjected to a surface treatment after the circuit layer to be subjected to a high-temperature heat treatment and the ceramic substrate are bonded, and the surface oxide film is made to have a predetermined thickness or less. Since the heat dissipation layer is bonded, a power module substrate with high bonding reliability can be manufactured at the bonding interface between the ceramic substrate and the heat dissipation layer.
- the power module 100 shown in FIG. 2 includes a power module substrate 10, an electronic component 20 such as a semiconductor chip mounted on the surface of the power module substrate 10, and a heat sink 30 bonded to the back surface of the power module substrate 10. It is composed of
- the circuit layer 12 is laminated on one surface (circuit layer surface) of the ceramic substrate 11 in the thickness direction, and the heat radiation layer 13 is disposed on the other surface (heat radiation layer surface) of the ceramic substrate 11. Bonded in a stacked state.
- the ceramic substrate 11 is formed of AlN, Al 2 O 3 , SiC, or the like, for example, to a thickness of 0.32 mm to 1.0 mm.
- the circuit layer 12 is made of pure copper or copper alloy such as oxygen-free copper or tough pitch copper.
- the heat dissipation layer 13 is made of pure aluminum or aluminum alloy having a purity of 99.00% or more.
- the thicknesses of the circuit layer 12 and the heat dissipation layer 13 are, for example, 0.25 mm to 2.5 mm.
- the power module substrate 10 of the present embodiment includes, for example, as a preferable combination example, a ceramic substrate 11 made of AlN having a thickness of 0.635 mm, a circuit layer 12 made of a pure copper plate having a thickness of 0.6 mm, and 4N having a thickness of 1.6 mm. -Consists of a heat dissipation layer 13 made of an aluminum plate.
- the bonding of the ceramic substrate 11, the circuit layer 12, and the heat dissipation layer 13 is performed in two steps as will be described later. That is, after the circuit layer 12 is first bonded to the circuit layer surface of the ceramic substrate 11, the heat dissipation layer 13 is bonded to the heat dissipation layer surface of the ceramic substrate 11.
- an active metal brazing material of Ag-27.4 mass% Cu-2.0 mass% Ti is used for joining the ceramic substrate 11 and the circuit layer 12.
- an Al—Si based or Al—Ge based brazing material is used for joining the ceramic substrate 11 and the heat dissipation layer 13.
- the circuit layer 12 is first bonded to the circuit layer surface of the ceramic substrate 11 (circuit layer bonding step), and then the heat dissipation layer 13 is bonded to the heat dissipation layer surface of the ceramic substrate 11 (heat dissipation layer bonding step).
- the surface (heat dissipation layer surface) of the ceramic substrate 11 on which the circuit layer 12 is not bonded is subjected to surface treatment (surface treatment step).
- the heat sink 30 is bonded to the heat dissipation layer 13.
- the circuit layer 12 is laminated on one surface (circuit layer surface) of the ceramic substrate 11 with an active metal brazing material made of paste or foil interposed therebetween to form a laminate 40.
- a plurality of the stacked bodies 40 are stacked in a state of being sandwiched between plate-like cushion sheets 50 made of carbon graphite or the like, and, for example, 0.3 MPa to 1.MP in the stacking direction by a pressing jig 110 as shown in FIG. Pressurize at 0 MPa.
- the pressurizing jig 110 includes a base plate 111, guide posts 112 vertically attached to the four corners of the upper surface of the base plate 111, a fixed plate 113 fixed to the upper ends of the guide posts 112, a base plate 111, A pressing plate 114 supported by the guide post 112 so as to be movable up and down between the fixing plate 113 and a spring or the like provided between the fixing plate 113 and the pressing plate 114 to urge the pressing plate 114 downward.
- Force means 115 Between the base plate 111 and the pressing plate 114, the laminated body 40 and the cushion sheet 50 described above are disposed.
- the pressurizing jig 110 is installed in a heating furnace (not shown), and in a vacuum atmosphere at a temperature of 800 ° C. or higher and 930 ° C. or lower for 1 minute or more.
- the ceramic substrate 11 and the circuit layer 12 are brazed by heating for 60 minutes.
- This brazing is a joining using an active metal brazing material, and Ti, which is an active metal in the brazing material, diffuses preferentially to the ceramic substrate 11 to form TiN, and the circuit layer is formed via an Ag—Cu alloy. 12 and the ceramic substrate 11 are joined.
- the oxide film can be reduced by washing the heat radiation layer surface of the ceramic substrate 11 with an acid.
- an acid As the cleaning acid, at least one selected from hydrochloric acid, nitric acid, and sulfuric acid is used. Among them, hydrochloric acid is particularly suitable because it has a weak oxidizing action, and for example, 18% by mass hydrochloric acid is used.
- the ceramic substrate 11 to which the circuit layer 12 is bonded is immersed in 18% hydrochloric acid for 5 minutes, the ceramic substrate 11 is pulled up, washed with distilled water to remove the surface acid, and further immersed in alcohols. dry.
- alcohols dry.
- ethanol can be used as the alcohol.
- nitric acid When nitric acid is used for this surface treatment, it may be sprayed on the surface of the heat dissipation layer of the ceramic substrate 11 instead of immersion. Thereby, generation
- the thickness of the oxide film on the heat dissipation layer surface of the ceramic substrate 11 is reduced to 3.2 nm or less at least at the peripheral portion of the region where the ceramic substrate 11 and the heat dissipation layer 13 are to be joined.
- the thickness of the oxide film at the outer peripheral portion of the bonding interface is predetermined. It is important to keep it below the value.
- the peripheral edge that defines the thickness of the oxide film is at a position where the distance from the peripheral edge of the region where the ceramic substrate 11 and the circuit layer 12 are to be bonded is 1 mm, for example.
- the thickness of the oxide film can be measured by an analysis result of a surface state by an X-ray photoelectron spectroscopy (XPS) (X-ray Photoelectron Spectroscopy).
- the heat dissipation layer 13 is laminated with a brazing material interposed on the surface of the ceramic substrate 11 after the surface treatment, and a plurality of sets are stacked in a state where the laminate is sandwiched between the cushion sheets 50 described above. 110 is pressurized in the laminating direction at, for example, 0.3 MPa to 1.0 MPa (not shown).
- the pressure jig 110 and the pressure jig 110 are placed in a heating furnace (not shown), and the temperature is 630 ° C. or higher and 650 ° C. or lower for 1 minute in a vacuum atmosphere.
- the ceramic substrate 11 and the heat dissipation layer 13 are brazed to manufacture the power module substrate 10.
- the power module substrate 10 manufactured in this way is subjected to the heat dissipation layer bonding step after the oxide film on the surface of the ceramic substrate 11 generated during the circuit layer bonding step is reduced by the surface treatment step,
- the oxide film present at the bonding interface with the heat dissipation layer 13 is extremely small, and the bonding reliability at the bonding interface between the ceramic substrate 11 and the heat dissipation layer 13 can be improved.
- the thickness of the oxide film on the entire surface of the ceramic substrate 11 in the surface treatment step there is a possibility that the peeling progresses in the outer peripheral portion where the thermal stress is most applied in the bonding interface between the ceramic substrate 11 and the heat dissipation layer 13. Therefore, at least the thickness of the oxide film at the peripheral portion in the outer peripheral portion of the region where the ceramic substrate 11 and the heat dissipation layer 13 are to be bonded should be 3.2 nm or less as described above.
- ceramic substrates made of 30 mm square AlN were prepared as samples a to g.
- the ceramic substrates of samples b to g were subjected to heat treatment at 860 ° C. for 30 minutes assuming active metal brazing.
- samples c to g were subjected to a surface treatment with an acid as follows. The thickness of each oxide film in samples a to g after each treatment was measured.
- the oxide film thickness was measured by XPS analysis.
- the analysis conditions are as follows.
- X-ray source Standard AlK ⁇ 350W Path energy: 187.85 eV (Survey), 58.5 eV (Depth) Measurement interval: 0.8 eV / step (Survey), 0.125 eV (Depth)
- Photoelectron extraction angle with respect to sample surface 45 deg Analysis area: about 800 ⁇ m ⁇ Sputter rate: 1.6 nm / min
- the oxide film thickness was calculated from the sputtering time and the sputtering rate, assuming that the oxygen peak area by XPS analysis was 1 ⁇ 2 of the initial oxygen film thickness. As shown by a point A in FIG. 4, the thickness of the oxide film is measured at a position 1 mm inward from the periphery of the bonding area S of the heat radiation layer 13 (4N-aluminum plate) to the ceramic substrate 11 at the position to be bonded S. The four points on the X-axis and Y-axis passing through the center of the sample were measured, and the average was defined as the oxide film thickness in each of the samples a to g (Table 1).
- a 4N-aluminum plate was joined to the surface of the ceramic substrate with an Al—Si brazing material, imitating the heat radiation layer 13.
- an aluminum alloy plate was brazed using a flux, simulating the heat sink 30, and the bondability between the ceramic substrate and the 4N-aluminum plate in each sample b to g was evaluated.
- the ultrasonic deep wound image obtained by photographing the joint surface with the ultrasonic deep wound device the non-joined part is indicated by a white part. Therefore, the area of the white portion in the planned bonding region S was measured and set as a non-bonded area. Further, the planned bonding area is the area of the planned bonding area S, that is, the area of the aluminum plate. Table 1 shows the results of evaluation of bondability.
- sample a and sample b shows that the thickness of the oxide film on the surface of the ceramic substrate was increased by the heat treatment.
- the thickness of the oxide film in samples c to g was reduced by the surface treatment with acid.
- Good bonding properties could be obtained for samples c to g in which the oxide film was reduced to 3.2 nm or less by the surface treatment. Since most non-bonded portions are limited to the outer peripheral portion of the bonding interface, it has been found that if the oxide film can be reduced on the outer peripheral portion, good bonding properties can be exhibited.
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Abstract
Description
本願は、2012年12月17日に出願された特願2012-275157号に基づき優先権を主張し、その内容をここに援用する。
回路層12を、ペースト又は箔からなる活性金属ろう材を介在させてセラミックス基板11の一方の面(回路層面)に積層して、積層体40を形成する。この積層体40を、カーボングラファイト等からなる板状のクッションシート50の間に挟んだ状態で複数組積み重ね、図3に示すような加圧治具110によって積層方向に例えば0.3MPa~1.0MPaで加圧する。
回路層接合工程時に、セラミックス基板11の回路層12とは反対面(放熱層面)も高温に晒されるため、その表面に酸化膜が形成される。表面処理工程では、そのセラミックス基板11に生じた酸化膜を削減する。
表面処理後のセラミックス基板11の放熱層面にろう材を介在させた状態で放熱層13を積層し、この積層体を前述したクッションシート50の間に挟んだ状態として複数組積み重ね、加圧治具110により積層方向に例えば0.3MPa~1.0MPaで加圧する(図示略)。
a:熱処理なし
b:熱処理のみ
c:熱処理後、18質量%塩酸に2.5分浸漬
d:熱処理後、18質量%塩酸に5分浸漬
e:熱処理後、18質量%塩酸に10分浸漬
f:熱処理後、30質量%硝酸水溶液に5分浸漬
g:熱処理後、14質量%硫酸水溶液に5分浸漬
X線源:Standard AlKα 350W
パスエネルギー:187.85eV(Survey)、58.5eV(Depth)
測定間隔:0.8eV/step(Survey)、0.125eV(Depth)
試料面に対する光電子取り出し角:45deg
分析エリア:約800μmφ
スパッタレート:1.6nm/min
11 セラミックス基板
12 回路層
13 放熱層
20 電子部品
30 ヒートシンク
40 積層体
50 クッションシート
110 加圧治具
111 ベース板
112 ガイドポスト
113 固定板
114 押圧板
115 付勢手段
Claims (3)
- セラミックス基板の一方の面に、銅からなる回路層をろう付けする回路層接合工程と、
前記セラミックス基板の他方の面に、アルミニウムからなる放熱層をろう付けする放熱層接合工程と、
前記回路層接合工程の後、前記放熱層接合工程の前に、前記セラミックス基板の前記他方の面の酸化膜厚さを、少なくとも前記セラミックス基板と前記放熱層との接合予定領域の周縁部で、3.2nm以下にする表面処理工程と、
を有し、
前記セラミックス基板と、このセラミックス基板の前記一方の面に接合された前記回路層と、前記セラミックス基板の前記他方の面に接合された前記放熱層とを有するパワーモジュール用基板を製造することを特徴とするパワーモジュール用基板の製造方法。 - 前記表面処理工程において、前記セラミックス基板の前記他方の面を塩酸、硝酸、硫酸から選ばれる一種以上の酸で洗浄することを特徴とする請求項1記載のパワーモジュール用基板の製造方法。
- 前記周縁部は、前記接合予定領域の周縁から1mmの位置であることを特徴とする請求項1に記載のパワーモジュール用基板の製造方法。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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EP13865283.9A EP2933831A4 (en) | 2012-12-17 | 2013-12-03 | METHOD FOR PRODUCING SUBSTRATE FOR POWER MODULES |
CN201380061034.5A CN104813466B (zh) | 2012-12-17 | 2013-12-03 | 功率模块用基板的制造方法 |
KR1020157018455A KR102198657B1 (ko) | 2012-12-17 | 2013-12-03 | 파워 모듈용 기판의 제조 방법 |
US14/652,554 US10057993B2 (en) | 2012-12-17 | 2013-12-03 | Manufacturing method of power-module substrate |
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JP2012275157A JP6056446B2 (ja) | 2012-12-17 | 2012-12-17 | パワーモジュール用基板の製造方法 |
JP2012-275157 | 2012-12-17 |
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WO2014097880A1 true WO2014097880A1 (ja) | 2014-06-26 |
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PCT/JP2013/082449 WO2014097880A1 (ja) | 2012-12-17 | 2013-12-03 | パワーモジュール用基板の製造方法 |
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US (1) | US10057993B2 (ja) |
EP (1) | EP2933831A4 (ja) |
JP (1) | JP6056446B2 (ja) |
KR (1) | KR102198657B1 (ja) |
CN (1) | CN104813466B (ja) |
TW (1) | TWI598929B (ja) |
WO (1) | WO2014097880A1 (ja) |
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CN109534842B (zh) * | 2018-11-26 | 2021-08-10 | 北京卫星制造厂有限公司 | 功率半导体模块用焊接工艺 |
KR102335531B1 (ko) * | 2019-05-17 | 2021-12-07 | 주식회사 아모센스 | 세라믹 기판 제조 방법 |
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JPH04160071A (ja) * | 1990-10-19 | 1992-06-03 | Ngk Insulators Ltd | ナトリウム―硫黄電池のセラミックス製絶縁体と金属部品との接合方法 |
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JP2001135902A (ja) * | 1999-11-10 | 2001-05-18 | Denki Kagaku Kogyo Kk | セラミックス回路基板 |
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JPS59150453A (ja) * | 1982-12-23 | 1984-08-28 | Toshiba Corp | 半導体モジユ−ル用基板の製造方法 |
MY139405A (en) | 1998-09-28 | 2009-09-30 | Ibiden Co Ltd | Printed circuit board and method for its production |
JP5038565B2 (ja) * | 2000-09-22 | 2012-10-03 | 株式会社東芝 | セラミックス回路基板およびその製造方法 |
JP2003007939A (ja) | 2001-06-19 | 2003-01-10 | Mitsubishi Materials Corp | ヒートシンク付セラミック回路基板及びその製造方法 |
JP3935037B2 (ja) * | 2002-09-30 | 2007-06-20 | Dowaホールディングス株式会社 | アルミニウム−セラミックス接合基板の製造方法 |
US20040149689A1 (en) * | 2002-12-03 | 2004-08-05 | Xiao-Shan Ning | Method for producing metal/ceramic bonding substrate |
US20100258233A1 (en) * | 2007-11-06 | 2010-10-14 | Mitsubishi Materials Corporation | Ceramic substrate, method of manufacturing ceramic substrate, and method of manufacturing power module substrate |
KR20110015544A (ko) * | 2008-05-16 | 2011-02-16 | 미쓰비시 마테리알 가부시키가이샤 | 파워 모듈용 기판, 파워 모듈, 및 파워 모듈용 기판의 제조 방법 |
KR20110033117A (ko) * | 2008-06-06 | 2011-03-30 | 미쓰비시 마테리알 가부시키가이샤 | 파워 모듈용 기판, 파워 모듈, 및 파워 모듈용 기판의 제조 방법 |
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DE102011103746A1 (de) * | 2011-05-31 | 2012-12-06 | Ixys Semiconductor Gmbh | Verfahren zum Fügen von Metall-Keramik-Substraten an Metallkörpern |
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- 2013-12-03 CN CN201380061034.5A patent/CN104813466B/zh active Active
- 2013-12-03 KR KR1020157018455A patent/KR102198657B1/ko active IP Right Grant
- 2013-12-03 EP EP13865283.9A patent/EP2933831A4/en not_active Withdrawn
- 2013-12-03 WO PCT/JP2013/082449 patent/WO2014097880A1/ja active Application Filing
- 2013-12-03 US US14/652,554 patent/US10057993B2/en active Active
- 2013-12-09 TW TW102145131A patent/TWI598929B/zh active
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KR20150097597A (ko) | 2015-08-26 |
JP6056446B2 (ja) | 2017-01-11 |
TWI598929B (zh) | 2017-09-11 |
CN104813466A (zh) | 2015-07-29 |
EP2933831A4 (en) | 2016-05-25 |
CN104813466B (zh) | 2017-12-15 |
EP2933831A1 (en) | 2015-10-21 |
JP2014120634A (ja) | 2014-06-30 |
US20150289385A1 (en) | 2015-10-08 |
KR102198657B1 (ko) | 2021-01-05 |
TW201435970A (zh) | 2014-09-16 |
US10057993B2 (en) | 2018-08-21 |
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