WO2013141149A1 - 半導体装置の製造方法 - Google Patents
半導体装置の製造方法 Download PDFInfo
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- WO2013141149A1 WO2013141149A1 PCT/JP2013/057366 JP2013057366W WO2013141149A1 WO 2013141149 A1 WO2013141149 A1 WO 2013141149A1 JP 2013057366 W JP2013057366 W JP 2013057366W WO 2013141149 A1 WO2013141149 A1 WO 2013141149A1
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- semiconductor device
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- insulating substrate
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- semiconductor
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 89
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000000758 substrate Substances 0.000 claims abstract description 49
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- 239000002184 metal Substances 0.000 claims abstract description 39
- 239000003153 chemical reaction reagent Substances 0.000 claims abstract description 16
- 125000000524 functional group Chemical group 0.000 claims abstract description 7
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- 230000001603 reducing effect Effects 0.000 claims abstract description 6
- 239000003960 organic solvent Substances 0.000 claims abstract description 5
- 239000010949 copper Substances 0.000 claims description 25
- 239000000463 material Substances 0.000 claims description 21
- 229910052802 copper Inorganic materials 0.000 claims description 12
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 11
- 238000010438 heat treatment Methods 0.000 claims description 11
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 9
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- 229910010271 silicon carbide Inorganic materials 0.000 claims description 7
- 125000003396 thiol group Chemical group [H]S* 0.000 claims description 6
- 229910052759 nickel Inorganic materials 0.000 claims description 3
- 229910002601 GaN Inorganic materials 0.000 claims description 2
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 claims description 2
- 125000004432 carbon atom Chemical group C* 0.000 claims description 2
- 239000010432 diamond Substances 0.000 claims description 2
- 229910003460 diamond Inorganic materials 0.000 claims description 2
- 238000002791 soaking Methods 0.000 claims 6
- 238000007598 dipping method Methods 0.000 claims 2
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- 229910000679 solder Inorganic materials 0.000 description 6
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 description 5
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- 229910021332 silicide Inorganic materials 0.000 description 4
- FVBUAEGBCNSCDD-UHFFFAOYSA-N silicide(4-) Chemical compound [Si-4] FVBUAEGBCNSCDD-UHFFFAOYSA-N 0.000 description 4
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- 150000001412 amines Chemical class 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
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- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 229910002482 Cu–Ni Inorganic materials 0.000 description 1
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 1
- ABLZXFCXXLZCGV-UHFFFAOYSA-N Phosphorous acid Chemical compound OP(O)=O ABLZXFCXXLZCGV-UHFFFAOYSA-N 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- 229910020836 Sn-Ag Inorganic materials 0.000 description 1
- 229910020830 Sn-Bi Inorganic materials 0.000 description 1
- 229910020935 Sn-Sb Inorganic materials 0.000 description 1
- 229910020988 Sn—Ag Inorganic materials 0.000 description 1
- 229910018728 Sn—Bi Inorganic materials 0.000 description 1
- 229910008757 Sn—Sb Inorganic materials 0.000 description 1
- 238000005411 Van der Waals force Methods 0.000 description 1
- 230000005856 abnormality Effects 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
- 125000003277 amino group Chemical group 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
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- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 1
- 150000004696 coordination complex Chemical class 0.000 description 1
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
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- 239000011261 inert gas Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 229910021334 nickel silicide Inorganic materials 0.000 description 1
- RUFLMLWJRZAWLJ-UHFFFAOYSA-N nickel silicide Chemical compound [Ni]=[Si]=[Ni] RUFLMLWJRZAWLJ-UHFFFAOYSA-N 0.000 description 1
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- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
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Images
Classifications
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- H—ELECTRICITY
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- 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
- H01L21/50—Assembly of semiconductor devices using processes or apparatus not provided for in a single one of the subgroups H01L21/06 - H01L21/326, e.g. sealing of a cap to a base of a container
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- H01L24/00—Arrangements for connecting or disconnecting semiconductor or solid-state bodies; Methods or apparatus related thereto
- H01L24/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L24/26—Layer connectors, e.g. plate connectors, solder or adhesive layers; Manufacturing methods related thereto
- H01L24/28—Structure, shape, material or disposition of the layer connectors prior to the connecting process
- H01L24/29—Structure, shape, material or disposition of the layer connectors prior to the connecting process of an individual layer connector
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- H01L24/80—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected
- H01L24/83—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected using a layer connector
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- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/26—Layer connectors, e.g. plate connectors, solder or adhesive layers; Manufacturing methods related thereto
- H01L2224/28—Structure, shape, material or disposition of the layer connectors prior to the connecting process
- H01L2224/29—Structure, shape, material or disposition of the layer connectors prior to the connecting process of an individual layer connector
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- H01L2224/26—Layer connectors, e.g. plate connectors, solder or adhesive layers; Manufacturing methods related thereto
- H01L2224/28—Structure, shape, material or disposition of the layer connectors prior to the connecting process
- H01L2224/29—Structure, shape, material or disposition of the layer connectors prior to the connecting process of an individual layer connector
- H01L2224/29001—Core members of the layer connector
- H01L2224/29099—Material
- H01L2224/291—Material with a principal constituent of the material being a metal or a metalloid, e.g. boron [B], silicon [Si], germanium [Ge], arsenic [As], antimony [Sb], tellurium [Te] and polonium [Po], and alloys thereof
- H01L2224/29138—Material with a principal constituent of the material being a metal or a metalloid, e.g. boron [B], silicon [Si], germanium [Ge], arsenic [As], antimony [Sb], tellurium [Te] and polonium [Po], and alloys thereof the principal constituent melting at a temperature of greater than or equal to 950°C and less than 1550°C
- H01L2224/29147—Copper [Cu] as principal constituent
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- H01L2224/26—Layer connectors, e.g. plate connectors, solder or adhesive layers; Manufacturing methods related thereto
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- H01L2224/32221—Disposition the layer connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
- H01L2224/32225—Disposition the layer connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being non-metallic, e.g. insulating substrate with or without metallisation
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- H01L2224/83001—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected using a layer connector involving a temporary auxiliary member not forming part of the bonding apparatus
- H01L2224/83002—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected using a layer connector involving a temporary auxiliary member not forming part of the bonding apparatus being a removable or sacrificial coating
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- H01L2224/83009—Pre-treatment of the layer connector or the bonding area
- H01L2224/8301—Cleaning the layer connector, e.g. oxide removal step, desmearing
- H01L2224/83011—Chemical cleaning, e.g. etching, flux
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- H01L2224/83—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected using a layer connector
- H01L2224/8319—Arrangement of the layer connectors prior to mounting
- H01L2224/83193—Arrangement of the layer connectors prior to mounting wherein the layer connectors are disposed on both the semiconductor or solid-state body and another item or body to be connected to the semiconductor or solid-state body
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- H01L2224/832—Applying energy for connecting
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- H01L2224/8338—Bonding interfaces outside the semiconductor or solid-state body
- H01L2224/83399—Material
- H01L2224/834—Material with a principal constituent of the material being a metal or a metalloid, e.g. boron [B], silicon [Si], germanium [Ge], arsenic [As], antimony [Sb], tellurium [Te] and polonium [Po], and alloys thereof
- H01L2224/83438—Material with a principal constituent of the material being a metal or a metalloid, e.g. boron [B], silicon [Si], germanium [Ge], arsenic [As], antimony [Sb], tellurium [Te] and polonium [Po], and alloys thereof the principal constituent melting at a temperature of greater than or equal to 950°C and less than 1550°C
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- H01L2224/838—Bonding techniques
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- H01L24/26—Layer connectors, e.g. plate connectors, solder or adhesive layers; Manufacturing methods related thereto
- H01L24/31—Structure, shape, material or disposition of the layer connectors after the connecting process
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Definitions
- the present invention relates to a method for manufacturing a semiconductor device, and more particularly to a method for manufacturing a semiconductor device using an organic reagent when a semiconductor element and a substrate are bonded.
- Sn-based solders include Sn-Ag, Sn-Bi, and Sn-Sb, and are mainly used for low-temperature bonding of semiconductors. Pure Sn is often used for the surface layer of the microchip component electrode. Basically, Sn-based solders are expected as Pb-free solders.
- ⁇ Stability over a long period of time is required at the junction of semiconductor elements that operate at high temperatures.
- the operating temperature of the semiconductor device is 250 ° C. or higher, it is difficult to apply Sn-based solder to the bonding material from the viewpoint of the melting point.
- the base material is sintered at a temperature of 300 ° C. or lower, and the joined portion after sintering has a high melting point. From the viewpoint of the bondability between the metal nanopaste and the electrode, copper containing a Cu alloy is selected as the electrode material.
- the members to be joined formed with the joining film made of copper are heated and pressed in a contact state, and the members to be joined are bonded by chemical bonding between the joining films.
- Copper or the like is applied to the members to be joined.
- a bonding film made of an organic metal such as a metal complex the surfaces of the films are heated and pressurized in the air or in an inert gas atmosphere (bonding temperature: 75 ° C. to 200 ° C., pressure: 5 MPa to 50 MPa) to bond It is characterized by having a layer in which the bonding films are bonded to each other at the subsequent bonding portion.
- the binding layer (joint) obtained with the prior art joining structure is chemically bonded. Since some organic substances remain in the binding layer, the binding layer tends to have a porous structure. Since the inside of the binder layer is easily oxidized in the atmosphere where oxygen coexists and easily changes with time, there is a concern that the reliability of the joint portion may be lowered.
- the present invention has been made to solve the above-described problems.
- a semiconductor device capable of ensuring stability over a long period of time even when a semiconductor element operates at a high temperature (especially, 175 ° C. or higher). It is to provide.
- the method of manufacturing a semiconductor device includes a step of preparing a solution in which a polymer reagent having a reducing functional group is dissolved in an organic solvent, and an insulating substrate having a metal layer formed on both sides is immersed in the solution.
- a metal member that easily oxidizes can be joined in the atmosphere.
- the junction of the semiconductor device achieves a stable adhesion strength for a long time during high temperature operation.
- FIG. 1 is an overall view of a finished product of a semiconductor device of the present invention.
- FIG. 6 is a schematic view for illustrating the method for manufacturing the semiconductor device according to the first embodiment.
- FIG. 10 is a schematic view for illustrating the method for manufacturing a semiconductor device according to the second embodiment. It is a figure for demonstrating the relationship between a test cycle and adhesion strength about the semiconductor device which performed SAM formation, and the semiconductor device which has not performed SAM formation.
- FIG. 1 shows an overall view of a semiconductor device according to the present invention.
- the semiconductor device 100 is composed of a base plate 8, a semiconductor element 9, an insulating substrate with electrode 10, and the like.
- An insulating substrate with electrode 10 is directly bonded on the base plate 8, and a semiconductor element 9 is directly bonded on the insulating substrate with electrode 10.
- the semiconductor element 9 includes a semiconductor chip 1, a metal silicide layer 2, a first metal layer (Ni) 3, and a second metal layer (Cu) 4.
- the insulating substrate with electrode 10 includes an electrode 5a, a brazing material 6, an insulating substrate 7, and an electrode 5b.
- a predetermined circuit pattern may be formed on the first metal layer 3 and the second metal layer 4.
- the semiconductor element 9 and the insulating substrate with electrode 10 are sealed with an epoxy resin or the like.
- the structure and materials such as semiconductor materials and metal layers are not limited to this.
- the size of the semiconductor element 9 is not particularly limited and may be adjusted as appropriate.
- the base plate 8 made of copper plate and the electrode 5b made of copper plate are directly joined by using molecular self-assembly, without using a joining material such as a solder material or a metal nano paste.
- the second metal layer 4 of the semiconductor element 9 and the electrode 5a made of a copper plate are directly bonded using molecular self-assembly.
- Molecular self-organization is molecular organization that does not depend on external induction or control.
- a spontaneously organized film is formed.
- a monomolecular film it is called a self-assembled monolayer (SAM).
- SAM-forming molecule usually has one functional group that binds to the substrate, and the subsequent chain structure facilitates tight packing by van der Waals forces.
- head group molecules having various functions such as hydrophilicity, hydrophobicity, chemical reactivity, biospecificity and biocompatibility are used.
- the semiconductor chip 1 in addition to those formed of silicon (Si), those formed of a wide band gap semiconductor having a band gap larger than that of silicon can be suitably used.
- the wide band gap semiconductor include silicon carbide (SiC), a gallium nitride material, and diamond.
- a method for manufacturing the semiconductor element 9 will be briefly described.
- a silicon carbide substrate (thickness 500 ⁇ m) having a diameter of several inches is prepared.
- a Ni film, an Au film, or the like is formed on at least one surface of the silicon carbide substrate by a method such as sputtering.
- the thickness of the film to be formed is not particularly limited, and may be appropriately adjusted according to the size of the semiconductor element 9 to be manufactured, but is generally 10 nm to 2000 nm.
- a nickel layer having a thickness of 50 nm is formed on one surface of the silicon carbide substrate as a metal layer for forming the metal silicide layer 2. Thereafter, a nickel silicide layer having a thickness of about 50 nm is formed by performing heat treatment at 800 ° C.
- a sputtering method is used to sequentially form a 200 nm thick Ni layer as the first metal layer 3 on the surface of the metal silicide layer and a 200 nm thick Cu layer as the second metal layer 4 on the surface of the Ni layer. Thereafter, a silicon carbide substrate cut into a 5.0 mm square size by a dicing apparatus and washed is used as the semiconductor element 9.
- the material of the insulating substrate 7 can be silicon nitride, alumina, aluminum nitride or the like.
- the insulating substrate 7, the electrode 5 a, and the electrode 5 b are joined by the brazing material 6.
- the insulating substrate with electrode 10 is preferably made of a material having a thermal conductivity of 20 W / m ⁇ k or more, more preferably made of a material having a thermal conductivity of 70 W / m ⁇ k or more.
- FIG. 2 is a schematic cross-sectional view for explaining the method of manufacturing the semiconductor device according to the first embodiment.
- the insulating substrate with electrode 10 has a structure in which a 60 mm square insulating substrate (0.32 mmt) is sandwiched from both sides by a 58 mm square copper plate (0.4 mmt).
- the surfaces of the second metal layer 4, the electrode 5a, the electrode 5b, and the base plate 8 were finished by mechanical polishing so as to have a flatness of about ⁇ 10 nm and a surface roughness (Rz) of 3 nm or less.
- This SAM reagent was dissolved in ethanol having volatility at room temperature and the concentration was adjusted to 1 mM to obtain a solution for SAM formation.
- the semiconductor element 9 on which the second metal layer 4 was formed, the base plate 8, and the insulating substrate with electrode 10 on which the electrodes 5a and 5b were formed were immersed for 48 hours at room temperature.
- SAM11 is formed in the surface of each member by immersion.
- the film-shaped SAM 11 When the film-shaped SAM 11 is heated, the film-shaped SAM 11 changes to a gaseous SAM 12.
- a natural oxide film CuO on the Cu surface of each member before immersion, but the surface of XPS or the like that the oxide film was reduced by the thiol group constituting the SAM reagent and the Cu surface was protected by SAM11 Confirmed by analysis.
- the SAM forming solution is obtained by dissolving a SAM reagent in a volatile organic solvent.
- a SAM reagent in a volatile organic solvent.
- the base material is taken out from the solution, and the solvent alcohol is evaporated at room temperature (drying: about 3 to 5 minutes).
- the formed SAM 11 is effective for several days.
- the necessity for alcohol cleaning is low, but alcohol cleaning or the like can also be performed after immersion.
- the insulating substrate with electrode 10 on which the SAM 11 is formed and the base plate 8 are overlapped, and direct bonding is performed under predetermined heating and pressing bonding conditions.
- a heating and pressing unit manufactured by Athlete FA Co., Ltd. was used for the joining.
- the temperature is raised from normal temperature to 300 ° C. while pressurizing 5 MPa on the electrode 5 a of the insulating substrate with electrode 10 in the atmosphere, and is held for 5 minutes after reaching 300 ° C.
- the SAM 11 is scattered during heating.
- a joined body of the insulating substrate with electrode 10 and the base plate 8 is obtained.
- the joined body of the insulating substrate with electrode 10 and the base plate 8 and the semiconductor element 9 are directly joined.
- the SAMs 11 are formed on the respective Cu surfaces by the same method as described above, the Cu surfaces are overlapped, and the heat and pressure bonding is performed by the same method as described above. Since the electrode 5b and the base plate 8 and the electrode 5a and the second electrode layer 4 are solid phase diffusion bonded, the bonding portion does not have a porous structure, and the inside of the bonding portion is not oxidized.
- an amine group (—NH 2) can be considered in addition to the thiol group (—SH).
- the SAM reagent desirably has a linear molecular structure.
- the SAM reagent has a boiling point of 300 ° C. or lower, and is desirably decomposed and sublimated at 350 ° C. or lower.
- a SAM reagent that satisfies this condition is suitable for applications where a bonding temperature of 350 ° C. or lower is desired.
- FIG. FIG. 3 is a schematic cross-sectional view for explaining a method for manufacturing a semiconductor device according to the second embodiment.
- the insulating substrate with electrode 10 has a structure in which a 60 mm square insulating substrate (0.32 mmt) is sandwiched from both sides by a 58 mm square copper plate (0.4 mmt).
- the surfaces of the second metal layer 4, the electrode 5a, the electrode 5b, and the base plate 8 were finished by mechanical polishing so as to have a flatness of about ⁇ 10 nm and a surface roughness (Rz) of 3 nm or less.
- the semiconductor element 9 on which the second metal layer 4 was formed and the insulating substrate with electrode 10 on which the electrodes 5a and 5b were formed were immersed in the SAM formation solution for 48 hours at room temperature.
- SAM11 is formed in the surface of each base material by immersion.
- the substrate is taken out from the SAM forming solution and the alcohol is evaporated at room temperature (drying: about 3 to 5 minutes).
- the insulating substrate with electrode 10 on which the SAM 11 is formed and the semiconductor element 9 are overlapped, and direct bonding is performed under predetermined heating and pressing bonding conditions.
- the temperature is raised from room temperature to 300 ° C., and after reaching 300 ° C., the electrode is held for 5 minutes.
- the SAM 11 is scattered during heating. Thereafter, by air cooling, a joined body of the insulating substrate with electrode 10 and the semiconductor element 9 is obtained.
- the joined body of the insulating substrate with electrode 10 and the semiconductor element 9 and the base plate 8 are directly joined.
- the SAM 11 is formed on each Cu surface by a method similar to the above, the Cu surfaces are overlapped, and heat-pressure bonding is performed by the same method as described above. Since the electrode 5b and the base plate 8 and the electrode 5a and the second electrode layer 4 are solid phase diffusion bonded, the bonding portion does not have a porous structure, and the inside of the bonding portion is not oxidized.
- Ni can be considered as a metal material that can be used for bonding. It was confirmed that bonding was possible with a Cu—Ni structure. It is also possible to join the semiconductor element 9, the insulating substrate with electrode 10, and the base plate 8 at the same time. However, since the dimensions of the base materials are different from each other, the pressure applied between the insulating substrate with electrode 10 and the base plate 8 is small because the applied pressure is adjusted to the semiconductor element having the smallest base material area when simultaneously joined. Become. In order to join all members at 10 MPa, as illustrated in the first embodiment and the second embodiment, each member may be joined separately.
- the sample of the comparative example and the sample related to the present application were put into an Espec Co. thermal shock tester (TSA-101S-W).
- the treatment conditions for the thermal shock test were ⁇ 40 to 200 ° C. ( ⁇ 40 ° C .: held for 30 minutes / 200 ° C .: held for 30 minutes).
- the adhesion strength was measured with a shear measuring device (HS4000) manufactured by Dage every 200 cycles.
- Fig. 4 shows the relationship between the measurement results of adhesion strength and the test cycle.
- Samples 1-1, 1-2, and 1-3 are comparative samples that are not subjected to SAM formation.
- Samples 2-1, 2-2, and 2-3 are samples of this embodiment in which SAM formation is performed.
- the adhesion strength was 30 kgf / chip or more, it was determined that there was no abnormality in adhesion, and when the adhesion strength was less than 30 kgf / chip, it was determined that the strength was reduced.
- the samples with SAM formation did not show a decrease in adhesion strength even after 1000 cycles, whereas the samples without SAM formation were 2 samples out of 3 samples in the initial cycle of 0 cycles. Exhibited a bonding strength of less than 30 kgf / chip. Therefore, using the scanning electron microscope JXA-8530F manufactured by JEOL, the initial cross-sectional observation of the semiconductor device according to the present embodiment at the 0th cycle when the adhesion strength after 1000 cycles was 30 kgf / chip or more was observed. went. At the interface between the electrode 5b and the base plate 8 and between the electrode 5a and the second metal layer 4, the Cu electrodes are solid phase diffusion bonded, and no intermediate phase is found at the bonding interface.
- the semiconductor device 100 When SiC is used for the semiconductor element 9, the semiconductor device 100 is operated at a higher temperature than that of Si in order to take advantage of its characteristics.
- the merit of the present invention for realizing a highly reliable semiconductor device becomes more effective.
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Abstract
Description
図1は、本発明に関わる半導体装置の全体図を示している。半導体装置100は、ベース板8、半導体素子9、電極付絶縁基板10などから構成されている。ベース板8の上には電極付絶縁基板10が、電極付絶縁基板10の上には半導体素子9が、それぞれ直接接合されている。半導体素子9は、半導体チップ1、金属シリサイド層2、第1金属層(Ni)3及び、第2金属層(Cu)4から構成されている。電極付絶縁基板10は、電極5a、ろう材6、絶縁基板7、電極5bから構成されている。第1金属層3と第2金属層4は所定の回路パターンが形成されていてもよい。半導体素子9と電極付絶縁基板10はエポキシ樹脂などによって封止されている。
チオール系
(CH)nSHの分子;n=2~16
OH(CH)nSHの分子;n=2~11
HS(CH)nSHの分子;n=2~16
アミン系
(CH)nNH2の分子;n=2~16
OH(CH)nNH2の分子;n=2~11
NH2(CH)nNH2の分子;n=2~16
チオール+アミン系
SH(CH)nNH2の分子;n=2~16
図3は、実施の形態2にかかわる半導体装置の製造方法を説明するための、断面外略図である。電極付絶縁基板10は、60mm角の絶縁基板(0.32mmt)を、58mm角の銅板(0.4mmt)で両側から挟んだ構造を有している。ベース板8には、100mm角の銅板(3.0mmt)を使用した。第2金属層4、電極5a、電極5bおよびベース板8の表面は、機械研磨により、±10nm程度の平坦度、3nm以下の表面粗さ(Rz)になるように仕上げた。
実施の形態1に基づいて作成された半導体装置と、SAMを形成しないで作成された半導体装置との密着強度を比較する実験を行った。比較サンプルの作製方法を説明する。半導体素子9と電極付絶縁基板10は、前記した方法で作成した。SAM形成を行っていない電極付絶縁基板10、ベース板8及び半導体素子9を用いて、前記と同様の方法で加熱加圧接合した。各半導体装置は、3個ずつ作製した。接合装置は、アスリートFA株式会社製造の加熱加圧ユニットを用いた。
Claims (9)
- 還元性官能基を有する高分子試薬が有機溶媒に溶解している溶液を準備する工程と、
金属製のベース板を前記溶液に浸漬する工程と、
両面に金属層が形成されている絶縁基板を前記溶液に浸漬する工程と、
前記浸漬する工程を経たベース板と前記浸漬する工程を経た絶縁基板を、接触させ、加圧しながら加熱し、前記ベース板と前記絶縁基板との接合体を作成する工程と、
前記接合体を前記溶液に浸漬する工程と、
片面に金属層が形成されている半導体チップを前記溶液に浸漬する工程と、
前記浸漬する工程を経た接合体と前記浸漬する工程を経た半導体チップを、接触させ、加圧しながら加熱し、接合する工程とを備えていることを特徴とする半導体装置の製造方法。 - 還元性官能基を有する高分子試薬が有機溶媒に溶解している溶液を準備する工程と、
両面に金属層が形成されている絶縁基板を前記溶液に浸漬する工程と、
片面に金属層が形成されている半導体チップを前記溶液に浸漬する工程と、
前記浸漬する工程を経た絶縁基板と前記浸漬する工程を経た半導体チップを、接触させ、加圧しながら加熱し、前記絶縁基板と前記半導体チップとの接合体を作成する工程とを備えていることを特徴とする半導体装置の製造方法。 - 前記接合体を前記溶液に浸漬する工程と、
金属製のベース板を前記溶液に浸漬する工程と、
前記浸漬する工程を経た接合体と前記浸漬する工程を経たベース板を接触させ、加圧しながら加熱し、接合する工程とを備えていることを特徴とする請求項2に記載の半導体装置の製造方法。 - 前記金属層および前記ベース板は、銅またはニッケルを含むことを特徴とする請求項1乃至3のいずれか1項に記載の半導体装置の製造方法。
- 前記高分子試薬は、還元性官能基としてチオール基を有することを特徴とする特徴とする請求項1または2に記載の半導体装置の製造方法。
- 前記高分子試薬は、直鎖状の分子構造を有することを特徴とする特徴とする請求項1または2に記載の半導体装置の製造方法。
- 前記高分子試薬の分子構造中の炭素原子の数は、16以下であることを特徴とする請求項6に記載の半導体装置の製造方法。
- 前記半導体チップの少なくとも一部がワイドバンドギャップ半導体により形成されていることを特徴とする請求項1乃至7のいずれか1項に記載の半導体装置の製造方法。
- 前記ワイドバンドギャップ半導体は、炭化珪素、窒化ガリウム系材料、ダイヤモンドのいずれかの半導体であることを特徴とする請求項8に記載の半導体装置の製造方法。
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