WO2007105361A1 - 電子部品モジュール - Google Patents
電子部品モジュール Download PDFInfo
- Publication number
- WO2007105361A1 WO2007105361A1 PCT/JP2007/000169 JP2007000169W WO2007105361A1 WO 2007105361 A1 WO2007105361 A1 WO 2007105361A1 JP 2007000169 W JP2007000169 W JP 2007000169W WO 2007105361 A1 WO2007105361 A1 WO 2007105361A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- electronic component
- component module
- brazing material
- metal plate
- module according
- Prior art date
Links
- 229910052751 metal Inorganic materials 0.000 claims abstract description 126
- 239000002184 metal Substances 0.000 claims abstract description 126
- 239000000463 material Substances 0.000 claims abstract description 84
- 238000002844 melting Methods 0.000 claims abstract description 30
- 230000008018 melting Effects 0.000 claims abstract description 30
- 239000000758 substrate Substances 0.000 claims abstract description 26
- 239000000919 ceramic Substances 0.000 claims abstract description 22
- 238000005219 brazing Methods 0.000 claims description 109
- 239000000945 filler Substances 0.000 claims description 35
- 239000004065 semiconductor Substances 0.000 claims description 32
- 229910052802 copper Inorganic materials 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 10
- 229910052709 silver Inorganic materials 0.000 claims description 8
- 229910052719 titanium Inorganic materials 0.000 claims description 5
- 229910052735 hafnium Inorganic materials 0.000 claims description 4
- 229910052726 zirconium Inorganic materials 0.000 claims description 4
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 3
- 229910052738 indium Inorganic materials 0.000 claims description 2
- 238000009413 insulation Methods 0.000 claims description 2
- 229910052718 tin Inorganic materials 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims 1
- 229910000679 solder Inorganic materials 0.000 abstract description 10
- 238000005476 soldering Methods 0.000 abstract description 8
- 239000010410 layer Substances 0.000 description 53
- 238000006243 chemical reaction Methods 0.000 description 25
- 239000010949 copper Substances 0.000 description 20
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 18
- 229910010271 silicon carbide Inorganic materials 0.000 description 18
- 238000000034 method Methods 0.000 description 12
- 238000005304 joining Methods 0.000 description 11
- 239000010936 titanium Substances 0.000 description 9
- 229910052581 Si3N4 Inorganic materials 0.000 description 7
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 7
- 230000006866 deterioration Effects 0.000 description 7
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 7
- 239000013078 crystal Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 229910017944 Ag—Cu Inorganic materials 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 239000011810 insulating material Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000011179 visual inspection Methods 0.000 description 3
- 239000002918 waste heat Substances 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- 230000005496 eutectics Effects 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 229910000765 intermetallic Inorganic materials 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 238000007650 screen-printing Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 230000008646 thermal stress Effects 0.000 description 2
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000002301 combined effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 1
- 229910052747 lanthanoid Inorganic materials 0.000 description 1
- 150000002602 lanthanoids Chemical class 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000013001 point bending Methods 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 238000007751 thermal spraying Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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- 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
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- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/0201—Thermal arrangements, e.g. for cooling, heating or preventing overheating
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- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/18—Printed circuits structurally associated with non-printed electric components
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- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N10/00—Thermoelectric devices comprising a junction of dissimilar materials, i.e. devices exhibiting Seebeck or Peltier effects
- H10N10/10—Thermoelectric devices comprising a junction of dissimilar materials, i.e. devices exhibiting Seebeck or Peltier effects operating with only the Peltier or Seebeck effects
- H10N10/13—Thermoelectric devices comprising a junction of dissimilar materials, i.e. devices exhibiting Seebeck or Peltier effects operating with only the Peltier or Seebeck effects characterised by the heat-exchanging means at the junction
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Definitions
- the present invention relates to an electronic component module.
- Power semiconductor modules are used as parts for controlling large currents such as electric vehicles and trains.
- Thermoelectric conversion modules are also used in devices that generate power using waste heat, thermostats in semiconductor processes, and devices that cool electronic devices.
- circuit boards in which metal plates are bonded to both surfaces of a ceramic substrate are used as substrates for mounting power semiconductor elements and thermoelectric elements (see Patent Documents 1 and 2).
- an electronic component such as a power semiconductor element or a thermoelectric element is soldered on one metal plate of a circuit board, and the other metal plate is soldered and fixed to a metal plate or a composite plate called a base plate. Is done.
- a thin semiconductor element is sandwiched between electrode blocks with good conductivity, such as copper, and the periphery is configured with an airtight seal structure, and multiple electronic components are integrated by applying pressure from the outside of the electrode block.
- the structure is also known (see Patent Document 3).
- thermoelectric conversion module When the electronic components that make up a power semiconductor module or thermoelectric conversion module are Si elements or thermoelectric elements for temperature control, their maximum operating temperature is about 125 ° C. Even soldering using solder or fixing by pressure welding can sufficiently withstand uniform heating and heat cycles (eg, room temperature to 125 ° C).
- the future semiconductor semiconductor module or thermoelectric conversion module has the following problems.
- a temperature of 300 ° C. to 500 ° C. is required in order to fully exhibit its characteristics. It is necessary to operate in a high temperature environment. SicC elements operated in high temperature environment can be rotated by conventional soldering. When fixed on the road board, the fixed state with the circuit board becomes unstable at the operating temperature of the S i C element, leading to peeling of the S i C element.
- thermoelectric conversion module that can operate in a high temperature environment
- electrical energy can be produced from high-temperature waste heat of around 500 ° C discharged from a car or factory.
- a reduction in load can be expected.
- thermoelectric element used in a high-temperature environment is fixed on a circuit board by conventional soldering
- the thermoelectric element can be stably fixed to the circuit board.
- a titanium layer or the like is interposed as an intermediate layer between the thermoelectric element and the electrode (see Patent Document 4).
- the intermediate layer and electrodes are formed by the thermal spraying method here, there are difficulties in manufacturability of thermoelectric conversion modules.
- thermoelectric elements are miniaturized in terms of yield and reliability, and that the number of mounted elements is greatly increased due to the miniaturization of the element size. Is done. For this reason, for example, the operating temperature is expected to be higher in power semiconductor modules. As the operating temperature of power semiconductor modules rises, the heat cycle becomes larger and the fluctuation due to thermal deformation and differential thermal expansion also increases. Therefore, electronic components such as SiC elements do not peel off from the circuit board and it is difficult to ensure reliability.
- Patent Document 1 Japanese Patent Laid-Open No. 2 0 0 2 _ 2 0 1 0 7 2
- Patent Document 2 Japanese Patent Laid-Open No. 2 0 0 2 _ 2 0 3 9 9 3
- Patent Document 3 Japanese Patent Laid-Open No. 10-0 9 8 1 4 0
- Patent Document 4 Japanese Patent Laid-Open No. 2 0 0 3 _ 3 0 9 2 9 4
- An object of the present invention is to provide an electronic component module that can improve reliability by suppressing peeling of the electronic component from a circuit board in a high temperature environment.
- An electronic component module includes a ceramic substrate having a first main surface and a second main surface opposite to the first main surface; A circuit board comprising: a first metal plate bonded to a first main surface; and a second metal plate bonded to the second main surface of the ceramic substrate; and the first and second An electronic component that is bonded to at least one of the metal plates via a brazing material layer and that can operate at least at 125 ° C.
- the brazing material layer has a melting point higher than the operating temperature of the electronic component. It is characterized by being made of brazing filler metal.
- FIG. 1 is a sectional view showing a configuration of an electronic component module according to a first embodiment of the present invention.
- FIG. 2 is a cross-sectional view showing a configuration of an electronic component module according to a second embodiment of the present invention.
- FIG. 3 is a cross-sectional view showing an example of a thermoelectric conversion module to which an electronic component module according to a second embodiment of the present invention is applied.
- FIG. 4 is a cross-sectional view showing another example of a thermoelectric conversion module to which the electronic component module according to the second embodiment of the present invention is applied.
- FIG. 1 shows the first aspect of the present invention.
- FIG. 1 shows an electronic component module according to one embodiment.
- FIG. 2 shows an electronic component module according to the second embodiment of the present invention.
- the electronic component module 1 shown in these drawings includes a circuit board 2 having a ceramic substrate 3 as an insulating substrate.
- the circuit board 2 includes a first metal plate 5 bonded to one main surface of the ceramic substrate 3 via a bonding layer 4, and a second metal plate bonded to the other main surface via a bonding layer 6. 7 and.
- the first metal plate 5 has a role as a circuit board.
- the second metal plate 7 serves as a joining plate to the base plate, or a heat radiating plate or a heat absorbing plate.
- An electronic component 9 is joined to the first metal plate 5 via a brazing material layer 8.
- the brazing material layer 8 is made of a brazing material having a melting point higher than the operating temperature of the electronic component 9.
- the second metal plate 1 is joined to the base plate 11 via a brazing material layer 10 made of a brazing material having a melting point higher than the operating temperature of the electronic component 9.
- the ceramic substrate 3 includes, for example, alumina (AI 2 0 3 ) sintered body, aluminum nitride (AIN) sintered body, silicon nitride (S i 3 N 4 ) sintered body, silicon carbide (S i C) ) It consists of a ceramic sintered body such as a sintered body.
- alumina (AI 2 0 3 ) sintered body aluminum nitride (AIN) sintered body
- silicon nitride (S i 3 N 4 ) sintered body silicon carbide (S i C)
- It consists of a ceramic sintered body such as a sintered body.
- an aluminum nitride sintered body is preferably used.
- a silicon nitride sintered body is preferably used from the viewpoint of high strength and a large substrate area.
- the aluminum nitride sintered body for example, those having a thermal conductivity of 18 O WZm ⁇ K or higher are preferably used, and those having a thermal conductivity of 20 O WZm ⁇ K or higher are more preferably used.
- the number of aluminum nitride crystal particles included in a linear distance of 50 m is 1 as described in, for example, Japanese Patent Application Laid-Open No. 2000-200. Examples are those in which the particle size of aluminum nitride particles and the ratio of the grain boundary phase composed of the sintering aid are adjusted so that the thermal conductivity is 20 O WZm.
- the silicon nitride sintered body for example, one having a thermal conductivity of 65 WZm K or more is used. It is preferably used, and more preferably 85 WZm ⁇ K or more.
- a silicon nitride sintered body for example, by setting the furnace cooling temperature after sintering to 100 ° C. h or less, 20% or more of the grain boundary phase in the silicon nitride sintered body (all grains) The ratio of the ratio to the phase) is crystallized.
- first and second metal plates 5 and 7 for example, metal plates mainly containing at least one selected from copper and aluminum are used.
- the thickness of these metal plates 5 and 7 is the ratio of the thickness t 1 of the first metal plate 5 to the thickness t 2 of the second metal plate 7 ((t 1 Z t 2) X 1 0 0 [% ]) Is preferably adjusted to be in the range of 50% or more and 20% or less.
- the thickness ratio (t 1 Z t 2 ratio) of the metal plates 5 and 7 is less than 50% or more than 200%, the first metal plate 5 and the ceramic substrate 3
- the amount of warp of the circuit board 2 obtained by joining the second metal plate 7 is large, and the brazing material layers 8 and 10 for joining the electronic component 9 and the base plate 11 are made to have a uniform thickness. It becomes difficult to apply. For this reason, for example, when joining a plurality of electronic components 9, it becomes difficult to uniformly contact and dispose them on the circuit board 2, and there is a possibility that the electronic components 9 that are insufficiently joined are generated. .
- the amount of warpage of the circuit board 2 is, for example, the size of the circuit board 2 If it is 60 mm X 6 O mm or less, it can be 15 m or less. Therefore, the filter material layers 8 and 10 can be applied to a uniform thickness. When there are a plurality of electronic components 9, they can be appropriately contacted, arranged and joined together on the circuit board 2.
- the thickness ratio (t 1 Z t 2 ratio) of the metal plates 5 and 7 is preferably in the range of 75% or more and 150% or less from the viewpoint of further reducing the warpage amount of the circuit board 2. More preferably, it is about 0%. Such a thickness ratio of the metal plates 5 and 7 is particularly suitable when the use environment temperature is 200 ° C. or higher.
- the ceramic substrate 3 and the first and second metal plates 5 and 7 are, for example, a bonding layer
- bonding layers 4 and 6 are not necessarily required. Without the bonding layers 4 and 6, the ceramic substrate 3 and the first and second gold The metal plates 5 and 7 may be joined directly. In such a case, the formation of the bonding layers 4 and 6 is omitted.
- the ceramic substrate 3 and the first and second metal plates 5 and 7 are bonded using a known direct bonding method (DBC method, DBA method, etc.), active metal bonding method, brazing material bonding method, etc. Is done.
- Examples of the active metal used in the active metal bonding method include Ti, Zr, and Hf. These may be used alone or in combination of two or more.
- the electronic component 9 is bonded to the surface opposite to the surface bonded to the ceramic substrate 3 of the first metal plate 5 via the brazing material layer 8. In this way, the electronic component 9 is mounted on the circuit board 2.
- the electronic component 9 can operate at least at 125 ° C., and examples thereof include a SiC semiconductor element (semiconductor element using a SiC single crystal), a thermoelectric conversion element, and the like.
- the electronic component 9 only needs to be operable at a temperature of 125 ° C. or higher, and may be a conventionally used Si element, resistor element, capacitor element, or the like.
- the electronic component 9 Since the electronic component 9 has a large heat cycle (temperature difference) due to the operating environment temperature of 125 ° C or higher, it is difficult to ensure reliability and characteristics.
- a wide gap semiconductor element such as an S i C element
- the heat cycle becomes large, increasing the load due to the thermal deformation of each part of the electronic component module 1 and the difference in coefficient of thermal expansion, making it difficult to ensure reliability.
- the number of mounted elements increases due to the miniaturization of the element size, the operating temperature will become higher and the load due to thermal deformation of each part and thermal expansion difference will increase further.
- the brazing material layer 8 has an electronic component.
- the maximum temperature of use of the Si element is about 125 ° C, and therefore has a melting point higher than the maximum temperature of use of the Si element (1 25 ° C)
- the brazing material peeling and deterioration of the electronic component 9 during use can be suppressed. Therefore, the reliability and characteristics of the electronic component module 1 can be improved.
- the operating environment temperature thereof is 300 ° C. or higher.
- a brazing material with a melting point higher than the operating environment temperature (300 ° C or higher) of the electronic components 9 such as SiC elements and thermoelectric elements to the brazing material layer 8
- the peeling and deterioration of the electronic component 9 can be suppressed. Therefore, the reliability and characteristics of the electronic component module 1 can be improved.
- the thermoelectric element include half-Heusler compounds described in Japanese Patent Laid-Open No. 2 0 0 5-2 8 6 2 2 9. Such a thermoelectric element can be applied even at an ambient temperature of 300 ° C. or higher.
- the electronic component module 1 of this embodiment is applied to an electronic component 9 operable at least at 125 ° C.
- the electronic component module 1 of this embodiment is suitable.
- the operating temperature of the electronic component 9 that serves as a reference for the melting point of the brazing filler metal layer 8 is the maximum operating temperature in the case of a general electronic component 9 such as an Si device.
- the operating environment temperature shall be indicated.
- the base plate 11 is joined to the surface of the second metal plate 7 opposite to the surface joined to the ceramic substrate 3 via the brazing filler metal layer 10.
- the base plate 11 for example, one having as a main component at least one selected from copper and aluminum is suitable.
- Such a base plate 11 is also joined to the second metal plate with a brazing filler metal layer 10 made of a brazing material having a melting point higher than the operating temperature of the electronic component 9, so that the electronic component module 1 The peeling of the base plate 1 1 during use can be suppressed.
- the second metal It is preferable to join the base plate 11 to the plate 7.
- the base plate 11 does not necessarily have to be joined as long as sufficient heat dissipation can be secured without joining the base plate 11.
- the second metal plate 7 functions as a heat sink.
- the brazing filler metal layer 8 is formed in a portion where the electronic component 9 on the first metal plate 5 is joined.
- the brazing filler metal layer 10 is formed on a portion of the second metal plate 7 where the base plate 11 is joined.
- the brazing filler metal layers 8 and 10 need to be formed at least in such a portion, but may be formed in other portions as long as there is no problem in insulation or the like.
- the brazing material layers 8, 10 are made of a brazing material having a melting point higher than the operating temperature of the electronic component 9 (electronic component module 1).
- the brazing material layers 8 and 10 are softened when the electronic component module 1 is used.
- the peeling of the plate 11 can be suppressed.
- the thermal stress due to the difference in thermal expansion between the first metal plate 5 and the electronic component 9 is relieved, peeling of the electronic component 9 and characteristic deterioration can be suppressed. As a result, it is possible to provide the electronic component module 1 having excellent reliability and operating characteristics.
- the melting point of the brazing material constituting the brazing material layers 8, 10 is at least 1225 ° C. It needs to be higher.
- the reliability, operating characteristics, etc. of the electronic component module 1 to which the electronic component 9 such as an Si element having a maximum operating temperature of about 125 ° C is applied are sufficiently obtained. It can be increased.
- the operating environment temperature is 300 to 500 ° C.
- the brazing filler metal constituting the brazing filler metal layers 8 and 10 must have a melting point higher than the operating environment temperature of the SiC element (300 ° C. or higher).
- the electronic component 9 is a high-temperature operation type thermoelectric element, it is exposed to high-temperature waste heat of about 500 ° C., for example.
- the brazing material constituting the brazing filler metal layers 8 and 10 is exposed to the thermoelectric element. Must have a higher melting point than the high temperature environment.
- brazing material layers 8 and 10 need only be composed of a brazing material having a melting point higher than the actual use temperature of the electronic component module 1.
- Examples of the brazing filler metal constituting the brazing filler metal layers 8 and 10 include Ag_Cu brazing filler metal having an eutectic composition and AI brazing filler metal.
- an Ag-Cu brazing material having a melting point of 600 ° C or higher is preferably an AI brazing material.
- the maximum operating temperature of the electronic component 9 is about 125 ° C.
- the operating temperature of the electronic component 9 is 300 Suppresses peeling of electronic component 9 and base plate 1 1 from circuit board 2 and deterioration of characteristics of electronic component 9 even when using SiC elements that exceed ° C and thermoelectric elements that operate at high temperatures can do.
- the lead-free electronic component module 1 can be easily realized.
- Ag_Cu brazing filler metal If AI brazing filler metal is used, there is no need to perform a soldering treatment to improve solder wettability, so the number of manufacturing steps for electronic component module 1 can be reduced. it can.
- the total content of the two elements of Ag and Cu is 85% by mass or more and has conductivity.
- the total content of the two elements is less than 85% by mass, the first metal plate 5 and the electronic component 9 are joined, or the second metal plate 7 and the base plate 1 1 Joining may be difficult.
- voids and the like may occur, and the bonding strength may be reduced.
- the Ag_Cu brazing material contains 85% by mass or more of two elements of Ag and Cu, and further 1 mass of at least one selected from Ti, Zr, and Hf. It is preferably contained in a range of 0 / o or more and 5% by mass or less, with the balance being at least one selected from Sn and In.
- the ratio of Ag and Cu when the total amount of Ag and Cu is 100 parts by mass, the ratio of Cu is preferably in the range of 10 to 35 parts by mass, and the balance is preferably Ag. It is desirable that the ratio satisfies the composition.
- the melting point is raised and the bonding strength is improved.
- generation of voids can be suppressed.
- the two elements Ag and Cu are contained in a total of 85 mass% or more, and Ti is contained in a range of 1 mass 0 / o or more and 5 mass% or less. It is preferable that the balance consists of Sn.
- the AI brazing material is preferably one having an AI content of 90 mass% or more and having conductivity. If the AI content is less than 90% by mass, it may be difficult to join the first metal plate 5 and the electronic component 9 or the second metal plate 7 and the base plate 11. . In addition, even if the joining itself is possible, voids and the like are generated, and the joining strength may be reduced.
- the AI-based brazing material contains 90 mass% or more of AI, and at least one selected from rare earth elements such as Y and lanthanide elements is 0.1 mass% or more and 3 mass%. It is preferable that the composition is contained in the following range, with the balance being Si. By containing 0.1 to 3% by mass of a rare earth element in the AI brazing filler metal, it is possible to increase the melting point and improve the bonding strength, while suppressing the generation of voids.
- the AI brazing materials those containing 90 mass% or more of AI and 0.1 to 3 mass% of soot with the balance being Si are particularly suitable.
- the circuit board 2 is manufactured prior to manufacturing the electronic component module 1. That is, the circuit board 2 is manufactured by bonding the first metal plate 5 and the second metal plate 7 to both main surfaces of the ceramic substrate 3 by a known bonding method.
- a brazing material having a melting point higher than the operating temperature of the electronic component 9 in at least a portion of the surface of the first metal plate 5 of the circuit board 2 where the electronic component 9 is to be joined is applied and dried by, for example, screen printing.
- a similar brazing filler metal paste is applied to at least a portion of the surface of the second metal plate 7 where the base plate 11 is to be joined by screen printing, for example. And let it dry.
- the electronic component 9 and the base plate 11 1 are placed on the brazing material pace ⁇ ⁇ ⁇ applied to the first metal plate 5 and the second metal plate 7, they are placed in contact with the brazing material.
- the first metal plate 5 and the electronic component 9 and the second metal plate 7 and the base plate 11 are joined to each other and the electronic component module 1 is manufactured.
- the base plate 11 can be joined to the second metal plate 7 at the same time.
- the first embodiment shown in FIG. 1 is suitable for an electronic component module 1 in which a semiconductor element such as an Si element or an SiC element is mounted on the circuit board 2 as the electronic component 9.
- An electronic component module 1 shown in FIG. 1 is, for example, a power semiconductor module.
- the electronic component 9 is preferably a SiC element that can operate in a high temperature environment of, for example, 300 ° C. or higher. Even when an Si element or an SiC element is applied as the electronic component 9, a plurality of electronic components 9 are mounted on the circuit board 2 as shown in FIG. 2 to constitute the electronic component module 1. It is also possible.
- an electronic component module (power semiconductor module) 1 in which a semiconductor element such as an Si element or an SiC element is mounted as the electronic component 9 a brazing material layer 8 having a melting point higher than the operating temperature of the electronic component 9 is used. , 9 can suppress peeling of the electronic component 9 and the base plate 11 from the circuit board 2 and deterioration of the characteristics of the electronic component 9.
- the Ag brazing filler metal applied to the brazing filler metal layers 8 and 9 can be made thinner than the conventional solder layer, the circuit board 2 The thermal resistance between and can be reduced.
- the thickness of the brazing filler metal layers 8 and 9 made of an AI brazing material can be 30 m or less, and further 10 m or less.
- the thickness of brazing filler metal layers 8 and 9 should be 3 m or more preferable. If the thickness of the brazing filler metal layers 8 and 9 is less than 3 m, sufficient bonding strength may not be obtained. As a result, the heat cycle characteristics (TCT characteristics) of the power semiconductor module 1 can be improved.
- the second embodiment shown in FIG. 2 is suitable for the electronic component module 1 in which a thermoelectric element is mounted as the electronic component 9 on the circuit board 2.
- the electronic component 9 is preferably a high temperature operation type thermoelectric element capable of operating in a high temperature environment of, for example, 300 ° C. or more, and further about 500 ° C.
- a thermoelectric material half-Heusler material
- Figure 3 shows the specific configuration of the thermoelectric conversion module.
- the thermoelectric conversion module 20 shown in FIG. 3 has a plurality of p-type thermoelectric elements 9A and a plurality of n-type thermoelectric elements 9B. These p-type thermoelectric elements 9 A and n-type thermoelectric elements 9 B are alternately arranged on the same plane, and the entire module is arranged in a matrix.
- the p-type thermoelectric element 9A and the n-type thermoelectric element 9B are arranged between the first circuit board 2A and the second circuit board 2B.
- a p-type thermoelectric element 9A and a single n-type thermoelectric element 9B adjacent to the p-type thermoelectric element 9A are connected to the first circuit board 2A as a first electrode connecting the elements.
- the metal plate 5A is arranged.
- the second electrode of the second circuit board 2 B is used as a second electrode for connecting these elements.
- 1 metal plate 5 B is arranged.
- the metal plate 5A as the first electrode and the metal plate 5B as the second electrode are arranged so as to be shifted by one element.
- the plurality of p-type thermoelectric elements 9 A and the plurality of n-type thermoelectric elements 9 B are electrically connected in series. That is, the p-type thermoelectric element 9 A, the n-type thermoelectric element 9 B, the p-type thermoelectric element 9 A, the n-type thermoelectric element 9 B, ... Electrodes 5B are respectively disposed.
- the p-type thermoelectric element 9 A and the n-type thermoelectric element 9 B and the electrodes (metal plates) 5 A and 5 B will have a melting point higher than the operating environment temperature of the thermoelectric elements 9 A and 9 B as described above.
- the base plate 1 is joined to 1.
- thermoelectric conversion module 20 shown in FIG. 3, the first circuit board 2 A is arranged on the low temperature side (L) so as to give a temperature difference between the upper and lower circuit boards 2 A and 2 B.
- the second circuit board 2B is used on the high temperature side (H). Based on this temperature difference, a potential difference is generated between the first electrode 5A and the second electrode 5B, and electric power can be taken out by connecting a load to the end of the electrode.
- the thermoelectric conversion module 20 can be used as a power generation device.
- the circuit board is obtained by using the brazing material layer 8 having a melting point higher than the operating environment temperature of the thermoelectric elements 9A and 9B. It is possible to suppress peeling of the thermoelectric elements 9 A and 9 B from 2 and deterioration of characteristics. Furthermore, the thickness of the first electrode (first metal plate 5 A of the first circuit board 2 A) arranged on the high temperature side (H) is set to the second electrode (on the low temperature side (L)). It is preferable to make it thinner than the thickness of the first metal plate 5 B) of the second circuit board 2B. This makes it possible to further improve the heat cycle characteristics (TCT characteristics) of the thermoelectric conversion module 20. In particular, it is possible to improve heat cycle characteristics and the like in an operating environment where the temperature difference between the high temperature side (H) and the low temperature side (L) is 300 ° C. or higher, and further 400 ° C. or higher.
- thermoelectric conversion module 20 can be used not only for power generation for converting heat into electric power but also for heating for converting electricity into heat. That is, when a direct current is passed through the P-type thermoelectric element 9A and the n-type thermoelectric element 9B connected in series, heat is radiated on one circuit board side and heat is absorbed on the other circuit board side. Therefore, the object to be processed can be heated by disposing the object to be processed on the circuit board on the heat radiation side.
- a semiconductor manufacturing apparatus performs temperature control of a semiconductor wafer, and the thermoelectric conversion module 20 can be applied to such temperature control.
- thermoelectric conversion module 20 can also be used by being housed in the case 21 as shown in FIG.
- the thermoelectric conversion module 20 is electrically connected to the electrode 22 and the conductive wire 23 provided on the case 21.
- Case 2 1 An insulating material 24 is filled in the inside so as to seal the thermoelectric conversion module 20.
- a gel-like sealing body such as silicone gel is preferably used.
- the sealing structure by the case 21 is effective not only for the thermoelectric conversion module 20 but also for the power semiconductor module.
- the melting point and composition of the brazing material constituting the brazing material layer 8 of the electronic component module 1, and the ratio of the thickness of the first metal plate 5 to the thickness of the second metal plate 7 are The following describes the results of manufacturing and evaluating the electronic component module 1 shown in Fig. 2 with respect to the effect of the component module 1 on the bondability and operable temperature.
- a structure in which the brazing material layer 10 and the base plate 11 are not provided in the electronic component module 1 is applied.
- an electronic component module to be evaluated was manufactured as follows.
- a ceramic substrate 3 made of a Si 3 N 4 sintered body with a length of 3 OmmX, a width of 35 mm, a thickness of 0.32 mm, a thermal conductivity of 90 WZmK, and a three-point bending strength of about 50 OMPa was prepared.
- a brazing material containing active metal is printed on both sides of the ceramic substrate 3 to a thickness of 15 m, and the first metal plate 5 and the second metal plate 7 are brought into contact with each brazing material, and 1 X Bonding was performed by heat treatment at 800 ° C. for 10 minutes in a vacuum of 10 3 Pa.
- the thickness t 2 of the second metal plate 7 is constant at 0.25 mm
- the thickness t 1 of the first metal plate 5 is the thickness of the second metal plate 7 t 2.
- the ratio to ((t 1Zt 2) x 1 00 [%]) was set to a value as shown in Table 1. Note that Cu plates were used as the first metal plate 5 and the second metal plate 7. Then, an etching resist ⁇ is printed in a predetermined shape on the first metal plate 5, a circuit pattern is formed by performing a ligching process with ferric chloride solution, and then the etching resist ⁇ is removed to remove the circuit board 2. It was.
- a brazing material having a melting point and composition as shown in Table 1 was printed at a thickness of 20 m on a portion of the first metal plate 5 to which the electronic component 9 was joined.
- the brazing material in this printed part is the brazing material layer 8.
- the A g_Cu alloy mainly composed of the A g_Cu brazing material shown in Table 1 is composed of Ag and C It has a eutectic composition in which the amount of CU is 28% by mass with respect to the total amount of U.
- the thickness of the brazing filler metal layer after joining was in the range of 10 15 m.
- thermoelectric element P-type semiconductor element
- n-type thermoelectric element n-type semiconductor element
- the bonding state of the electronic component 9 is visually adjusted for each electronic component module 1.
- the bonding strength was measured for those that could be bonded (bondability before TCT).
- a thermal cycle test of 3000 cycles was performed with _50 ° CX 30 minutes ⁇ room temperature X10 minutes ⁇ 155 ° CX 30 minutes ⁇ room temperature X10 minutes as one cycle.
- the maintainability of the electronic component 9 was visually inspected.
- the bond strength was measured (bondability after TCT). Table 2 shows the results.
- the brazing material constituting the brazing filler metal layer 8 is, in particular, a Ag_C u whose total content of the two elements of Ag and Cu is 85 wt% or more. It can be seen that a brazing filler metal or an AI brazing filler metal having an AI content of 9 Ow% or more is preferable. It can be seen that the ratio of the thickness of the first metal plate 5 to the thickness of the second metal plate 7 is preferably 50% or more and 200% or less, and more preferably 75% or more and 150% or less.
- a power semiconductor module having the structure shown in FIG. 1 was manufactured, and its TCT characteristics were measured and evaluated.
- the circuit board was the same as the specific example described above.
- S i C elements are sample 3 and sample in Table 1. 1 Bonded to the circuit board with a brazing material having the same composition as 3.
- a power semiconductor module using the same filter material of sample 3 was used as sample 20, and a power semiconductor module using the same brazing material as used in sample 13 was used as sample 21.
- the TCT characteristics of these power semiconductor modules were evaluated as follows.
- thermoelectric conversion module whose structure is shown in FIG. 3 was produced, and its TCT characteristics were measured and evaluated.
- the ratio of the thickness T 1 of the first electrode 5 A arranged on the high temperature side (H) to the thickness T 2 of the second electrode 5 B arranged on the low temperature side (L) is shown in Table 4
- the thermoelectric conversion module (Samples 22 to 26) was manufactured by changing as shown in It was.
- the TCT characteristics of each of these thermoelectric conversion modules were evaluated as follows.
- the low temperature side (L) is 25 ° C
- the high temperature side (H) is 200 ° C or 500 ° C
- 25 ° CX 10 minutes ⁇ 200 ° C or 500 ° C x 30 minutes is one cycle.
- a 3000-cycle thermal cycle test was conducted. The operation of the thermoelectric module after each thermal cycle test was confirmed. Those that operated after the TCT test were evaluated as “good”, and those that did not operate were determined as “bad”. The operation of the thermoelectric module after the TCT test means that no bonding failure has occurred between the thermoelectric element and the electrode.
- thermoelectric elements 9A and 9B thermoelectric materials having an intermetallic compound phase having a MgAgAs type crystal structure as a main phase were used.
- a silicon nitride substrate (thickness 0.3 mm ⁇ width 6 Omm ⁇ length 6 Omm) bonded to a copper plate as the electrodes 5A and 5B was used.
- the junction between the thermoelectric element and the electrode, and the junction between the electrode and the silicon nitride substrate contains 69% by mass, 21% by mass of Cu, and 2% by mass of Ti, with the balance being Sn.
- a brazing filler metal was used.
- the thickness of the brazing filler metal layer after joining was set to 10 to 15 m.
- a bonding layer using a 20 m thick Ti layer was prepared.
- the electronic component module of the aspect of the present invention it is possible to suppress peeling of the electronic component based on the operating temperature. Therefore, it is possible to provide an electronic component module having excellent reliability.
- Such an electronic component module is effectively used for various electronic components, particularly electronic components used in a high temperature environment.
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Computer Hardware Design (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Ceramic Engineering (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Cooling Or The Like Of Semiconductors Or Solid State Devices (AREA)
- Electric Connection Of Electric Components To Printed Circuits (AREA)
- Structures For Mounting Electric Components On Printed Circuit Boards (AREA)
- Die Bonding (AREA)
- Ceramic Products (AREA)
Abstract
Description
Claims
Priority Applications (5)
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EP07713551.5A EP2006895B1 (en) | 2006-03-08 | 2007-03-05 | Electronic component module |
JP2008504986A JPWO2007105361A1 (ja) | 2006-03-08 | 2007-03-05 | 電子部品モジュール |
US12/281,856 US8273993B2 (en) | 2006-03-08 | 2007-03-05 | Electronic component module |
CN2007800081204A CN101401197B (zh) | 2006-03-08 | 2007-03-05 | 电子元器件模块 |
US13/589,446 US9214617B2 (en) | 2006-03-08 | 2012-08-20 | Electronic component module |
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US13/589,446 Division US9214617B2 (en) | 2006-03-08 | 2012-08-20 | Electronic component module |
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US (2) | US8273993B2 (ja) |
EP (1) | EP2006895B1 (ja) |
JP (2) | JPWO2007105361A1 (ja) |
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Also Published As
Publication number | Publication date |
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JP2013048294A (ja) | 2013-03-07 |
CN101401197A (zh) | 2009-04-01 |
EP2006895A1 (en) | 2008-12-24 |
EP2006895B1 (en) | 2019-09-18 |
CN101401197B (zh) | 2011-05-18 |
JPWO2007105361A1 (ja) | 2009-07-30 |
US20120305304A1 (en) | 2012-12-06 |
EP2006895A4 (en) | 2016-08-10 |
JP5656962B2 (ja) | 2015-01-21 |
TWI397979B (zh) | 2013-06-01 |
US8273993B2 (en) | 2012-09-25 |
US20090056996A1 (en) | 2009-03-05 |
TW200802744A (en) | 2008-01-01 |
US9214617B2 (en) | 2015-12-15 |
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