WO2008004591A1 - Procédé de production d'une tranche liée - Google Patents
Procédé de production d'une tranche liée Download PDFInfo
- Publication number
- WO2008004591A1 WO2008004591A1 PCT/JP2007/063387 JP2007063387W WO2008004591A1 WO 2008004591 A1 WO2008004591 A1 WO 2008004591A1 JP 2007063387 W JP2007063387 W JP 2007063387W WO 2008004591 A1 WO2008004591 A1 WO 2008004591A1
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- WO
- WIPO (PCT)
- Prior art keywords
- wafer
- layer
- active layer
- oxygen ion
- bonded
- Prior art date
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 28
- 239000001301 oxygen Substances 0.000 claims abstract description 105
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 105
- -1 oxygen ions Chemical class 0.000 claims abstract description 71
- 238000010438 heat treatment Methods 0.000 claims abstract description 65
- 238000000034 method Methods 0.000 claims abstract description 49
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 35
- 230000001590 oxidative effect Effects 0.000 claims abstract description 23
- 238000005498 polishing Methods 0.000 claims description 34
- 238000005468 ion implantation Methods 0.000 claims description 25
- 238000005530 etching Methods 0.000 claims description 20
- 239000007789 gas Substances 0.000 claims description 17
- 230000002378 acidificating effect Effects 0.000 claims description 15
- 239000001257 hydrogen Substances 0.000 claims description 13
- 229910052739 hydrogen Inorganic materials 0.000 claims description 13
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 11
- 230000008878 coupling Effects 0.000 claims description 8
- 238000010168 coupling process Methods 0.000 claims description 8
- 238000005859 coupling reaction Methods 0.000 claims description 8
- 239000002253 acid Substances 0.000 claims description 6
- 238000010306 acid treatment Methods 0.000 claims description 6
- 230000007547 defect Effects 0.000 abstract description 22
- 230000003746 surface roughness Effects 0.000 abstract description 21
- 239000010410 layer Substances 0.000 description 160
- 235000012431 wafers Nutrition 0.000 description 140
- 239000010408 film Substances 0.000 description 52
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 22
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 19
- 229910052710 silicon Inorganic materials 0.000 description 19
- 239000010703 silicon Substances 0.000 description 19
- 238000000227 grinding Methods 0.000 description 12
- 229910052786 argon Inorganic materials 0.000 description 11
- 239000012670 alkaline solution Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 125000004429 atom Chemical group 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 230000001133 acceleration Effects 0.000 description 5
- 239000013078 crystal Substances 0.000 description 5
- 238000002347 injection Methods 0.000 description 5
- 239000007924 injection Substances 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 239000010409 thin film Substances 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 238000002513 implantation Methods 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 3
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000006061 abrasive grain Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 229910052796 boron Inorganic materials 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 3
- 239000002019 doping agent Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 2
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- GLUUGHFHXGJENI-UHFFFAOYSA-N Piperazine Chemical compound C1CNCCN1 GLUUGHFHXGJENI-UHFFFAOYSA-N 0.000 description 2
- 150000002431 hydrogen Chemical class 0.000 description 2
- GPRLSGONYQIRFK-UHFFFAOYSA-N hydron Chemical compound [H+] GPRLSGONYQIRFK-UHFFFAOYSA-N 0.000 description 2
- 239000011259 mixed solution Substances 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 238000009279 wet oxidation reaction Methods 0.000 description 2
- PIICEJLVQHRZGT-UHFFFAOYSA-N Ethylenediamine Chemical compound NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 238000003776 cleavage reaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004299 exfoliation Methods 0.000 description 1
- 238000007429 general method Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 150000002926 oxygen Chemical class 0.000 description 1
- 238000009832 plasma treatment Methods 0.000 description 1
- 238000007517 polishing process Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000007017 scission Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000000427 thin-film deposition Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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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
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/76—Making of isolation regions between components
- H01L21/762—Dielectric regions, e.g. EPIC dielectric isolation, LOCOS; Trench refilling techniques, SOI technology, use of channel stoppers
- H01L21/7624—Dielectric regions, e.g. EPIC dielectric isolation, LOCOS; Trench refilling techniques, SOI technology, use of channel stoppers using semiconductor on insulator [SOI] technology
- H01L21/76251—Dielectric regions, e.g. EPIC dielectric isolation, LOCOS; Trench refilling techniques, SOI technology, use of channel stoppers using semiconductor on insulator [SOI] technology using bonding techniques
-
- 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
- H01L21/18—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 the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/20—Deposition of semiconductor materials on a substrate, e.g. epitaxial growth solid phase epitaxy
- H01L21/2003—Deposition of semiconductor materials on a substrate, e.g. epitaxial growth solid phase epitaxy characterised by the substrate
- H01L21/2007—Bonding of semiconductor wafers to insulating substrates or to semiconducting substrates using an intermediate insulating layer
-
- 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
- H01L21/18—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 the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/26—Bombardment with radiation
- H01L21/263—Bombardment with radiation with high-energy radiation
- H01L21/265—Bombardment with radiation with high-energy radiation producing ion implantation
- H01L21/26506—Bombardment with radiation with high-energy radiation producing ion implantation in group IV semiconductors
-
- 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
- H01L21/18—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 the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/302—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
- H01L21/306—Chemical or electrical treatment, e.g. electrolytic etching
- H01L21/30604—Chemical etching
-
- 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
- H01L21/18—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 the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/302—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
- H01L21/306—Chemical or electrical treatment, e.g. electrolytic etching
- H01L21/30625—With simultaneous mechanical treatment, e.g. mechanico-chemical polishing
Definitions
- the present invention is intended to effectively prevent the generation of defects, particularly poor surface roughness, caused by an oxygen ion implanted layer in the production of a bonded wafer.
- polishing silicon wafers 1 Polishing method to form SOI layer by grinding (grinding polishing method) or implanting hydrogen ions etc. into the surface layer of silicon wafer (active layer wafer) on the SOI layer side
- a method of forming an SOI layer (smart cut method) by forming a layer and then bonding it to a silicon wafer for a supporting substrate, followed by peeling with the above-mentioned ion implantation layer by heat treatment is known.
- Patent Document 1 International Publication Number “WO 2005/074033 A1J
- Patent Document 1 Although the technique disclosed in Patent Document 1 described above has good film thickness uniformity after thin film formation, the surface roughness is deteriorated or defects occur after thinning. This was because the oxygen ions introduced during oxygen ion implantation did not form a complete oxide film and existed in a discontinuous state, and the subsequent process (when the oxygen ion implanted layer was exposed) ), It is considered that the surface roughness is poor or defects are generated.
- the occurrence of defects with poor surface roughness as described above may be improved by the oxidation process or the oxide film removal process in the next step. There is concern over further expansion.
- the bonding wafer after thinning is performed at 1100 ° C in a non-acidic atmosphere such as hydrogen or argon gas.
- a non-acidic atmosphere such as hydrogen or argon gas.
- This effect is extremely effective especially when silicon wafers having no insulating film are directly bonded to each other.
- the present invention is based on the above findings.
- the gist of the present invention is as follows.
- a bonded wafer consisting of an active layer wafer with or without an insulating film on the surface directly bonded to a support layer wafer and then thinning the active layer wafer.
- a method for producing a bonded wafer characterized in that the time-series coupling is as follows.
- a method of manufacturing a bonded wafer comprising: peeling off a part of the wafer for active layer with the ion-implanted layer as a boundary by peeling heat treatment,
- a method for producing a bonded wafer characterized in that the time-series coupling is as follows. [0009] 3. An active layer wafer with or without an insulating film on the surface is directly bonded to the support layer mask, and then the active layer wafer is thinned.
- a method for manufacturing a wafer comprising:
- a method for producing a bonded wafer characterized in that the time-series coupling is as follows.
- the bonding layer is formed by directly bonding the active layer wafer with or without an insulating film on the surface to the support layer mask, and then thinning the active layer wafer.
- a method for manufacturing a wafer comprising:
- a method for producing a bonded wafer characterized in that the time-series coupling is as follows.
- the oxygen dose in the step of forming the oxygen ion implanted layer is 5.0 ⁇ 10 16 to 5.0 ⁇ 10 17 atoms / cm 2.
- FIG. 1 is a diagram comparing surface roughness of Examples 1 and 2 and Comparative Examples 1 and 2.
- FIG. 1 is a diagram comparing surface roughness of Examples 1 and 2 and Comparative Examples 1 and 2.
- a force that bonds two active wafers and a supporting wafer is used.
- the present invention can also be applied to a case where a substrate having no insulating film as well as a layer having no insulating film is directly bonded to a support layer wafer.
- the thickness of the insulating film is as thin as 50 ⁇ m or less, particularly when there is no strong insulating film, deterioration of the surface roughness and generation of defects are concerned. Is effectively prevented.
- oxygen ions are implanted into the active layer wafer to form an oxygen ion implanted layer in the active layer.
- an oxide film will be formed on the surface of this oxygen ion implanted layer.
- the implantation acceleration voltage and dose amount of oxygen ions implanted into the active layer wafer are not particularly limited, and may be appropriately selected according to the target film thickness of the active layer.
- the input voltage is 100 to 300 keV and the oxygen dose is in the range of 5.0 ⁇ 10 16 to 5.0 ⁇ 10 17 atoms / cm 2 .
- the active layer wafer in which the oxygen ion implanted layer is formed in the active layer in this way is 1100 ° C. in a non-acidic atmosphere such as hydrogen or argon. Apply heat treatment at the above temperature. As a result, the form of the oxygen ion implanted layer becomes relatively continuous, and when the oxygen ion implanted layer is subsequently exposed, the surface roughness is greatly improved and the occurrence of defects can be suppressed. is there.
- the heat treatment temperature needs to be 1100 ° C or higher as described above. This is because if the heat treatment temperature is less than 1100 ° C., an oxygen ion implanted layer having sufficient continuity is not formed, and only the same result as in the case where heat treatment is not performed can be obtained. Nonetheless, if this heat treatment temperature exceeds 1250 ° C, slip transition may occur, so the heat treatment temperature range is preferably 1100-1250 ° C.
- various heating methods such as single-wafer type lamp heating, resistance heating, flash annealing, etc. that can be applied only with a batch type furnace can be applied, and a power notch type furnace is used.
- a single-wafer furnace it is preferable to perform a heat treatment of 10 seconds or longer in order to optimize the heat treatment time of each device in consideration of productivity.
- the active layer wafer and the support layer wafer are bonded together.
- the organic material on the bonding surface is removed by plasma treatment using nitrogen, oxygen, argon, diluted hydrogen, the mixed gas, or the like. This is extremely effective in suppressing void defects and improving yield. [0020] Thereafter, heat treatment for improving the bonding strength is performed.
- the atmosphere in this heat treatment is not particularly limited, but the treatment temperature and time are preferably about 1200 ° C. and about 60 minutes.
- the woofer portion for the active layer of the bonded woofer is ground up to the front of the oxygen ion implanted layer. Usually, this grinding is performed by mechanical processing.
- the active layer wafer is further polished or etched to expose the oxygen ion implanted layer.
- a polishing process When a polishing process is used as the above-described thin film treatment, it is preferably performed while supplying an abrasive having an abrasive grain concentration of 1% by mass or less.
- An example of a powerful polishing liquid is an alkaline solution having a particle size (eg, silica) of 1% by mass or less.
- an alkaline solution an inorganic alkaline solution (KOH, NaOH, etc.), an organic alkaline solution (for example, piperazine, ethylenediamine, etc. containing an amine as a main component) or a mixed solution thereof is suitable.
- Powerful polishing liquids may have a particle concentration of 1% by mass or less, and chemical polishing action with an alkaline solution that has almost no mechanical polishing action due to the injection of particles is given priority. Efficient polishing of Si layer due to high etching rate ratio of SiZSiO
- the etching solution is preferably an etching solution in which an alkaline etching solution (solution temperature: 85 ° C) in which KOH is dissolved in pure water (DIW) is preferred. Subsequent bonding wafer is immersed.
- the KOH concentration in the alkaline etching solution is preferably about 10% by mass, and about 0.1% by mass of hydrogen peroxide (H 0
- the etching rate ratio of Si / SiO becomes 300 or more, and the oxide film (SiO 2) is damaged.
- the Si layer partially remaining by grinding is polished to expose the oxygen ion-implanted layer, and this oxygen ion-implanted layer is chemically polished with an alkaline solution. Does not work. For this reason, the oxygen ion implanted layer is hardly polished. as a result, The oxygen ion implanted layer can be exposed uniformly.
- the bonded wafer is subjected to an acid treatment to form an oxide film having a predetermined thickness on the exposed surface of the oxygen ion implanted layer.
- the treatment temperature for the oxidation treatment in an oxidizing atmosphere is not particularly limited, but is preferably an oxidizing atmosphere at 600 to 1000 ° C.
- the thickness of the oxide film to be formed is not particularly limited, but is preferably about 100 to 500 nm.
- the removal of the oxide film may be performed by cleaning with HF liquid or by etching using hydrogen gas, Ar gas or a gas containing HF.
- the above oxidation treatment and removal treatment may be performed a plurality of times. As a result, it is possible to form a thin film of the active layer while maintaining the flattened surface roughness.
- an acid film is formed by an acid treatment, and then the step of removing the oxide film by, for example, HF etching is performed. By repeating, the active layer is made thinner.
- the bonded wafer After removing the oxide film, for example, the bonded wafer is immersed in a mixed solution of organic acid and hydrofluoric acid to remove particles and metal impurities adhering to the surface of the bonded wafer. It is advantageous to do.
- the thin film bonded wafer is subjected to a heat treatment at a temperature of 1100 ° C. or less in a non-acidic atmosphere such as hydrogen or argon gas.
- a heat treatment at a temperature of 1100 ° C. or less in a non-acidic atmosphere such as hydrogen or argon gas.
- This effect is remarkable when the thickness of the insulating film is as thin as 50 mm or less, or when silicon wafers that do not have a strong insulating film are directly bonded together.
- this heat treatment temperature exceeds 1100 ° C, the flatness is promoted. Considering the uniformity of the active layer thickness and the effect of removing the residue at the bonding interface, it may be 1100 ° C or less. is important. That is, when the temperature exceeds 1100 ° C, the etching of the active layer is accelerated, and the uniformity of the film thickness may be deteriorated. When the temperature is increased, it remains at the bonding interface. There is a possibility that the oxide easily diffuses to the active layer side, locally etches the active layer, and generates pit-like defects on the surface. Therefore, the heat treatment temperature was limited to 1100 ° C or less. However, if the heat treatment temperature is less than 1000 ° C, the above-described effects cannot be obtained, so the heat treatment temperature is preferably 1000 ° C or higher.
- an ion-implanted layer is formed by ion implantation of hydrogen or a rare gas element into an active layer wafer. This ion-implanted layer will act as a boundary when a part of the active layer wafer is peeled off by cleavage in the future.
- the active layer wafer and the support layer wafer are bonded together.
- This exfoliation heat treatment may be performed at a temperature of about 500 ° C. according to a conventional method. As a result, the bonded wafer is completely peeled off on the entire surface with the ion injection layer as a boundary.
- the bonded wafer after peeling is subjected to heat treatment for improving the bonding strength and removing the damage layer due to peeling.
- the treatment temperature, the treatment time, and the oxidation method are not limited.
- a condition capable of removing the thickness of the damaged layer generated during peeling is necessary.
- the thickness for forming the oxide film needs to be 200 nm or more.
- the surface force of the active layer wafer is implanted with oxygen ions to form an oxygen ion implanted layer in the active layer.
- the oxygen ion implanted layer may be formed in the same manner as in the above-described grinding / polishing method. However, as the implantation conditions, it is necessary to determine the depth for forming the oxygen implantation layer in advance, for example, by performing the acceleration voltage at 30 to 50 keV in consideration of the thickness of the final active layer.
- the bonded wafer is heated to a temperature of 1100 ° C or higher in a non-acidic atmosphere. Apply heat treatment.
- the oxygen ion implanted layer is in a relatively continuous state, and when the oxygen ion implanted layer is subsequently exposed, the surface roughness is greatly improved and the occurrence of defects can be suppressed. I'll do it.
- the heat treatment conditions and the furnace used may be the same as in the case of the grinding and polishing method described above.
- the active layer wafer up to the peel surface force oxygen ion implanted layer is polished or etched to expose the oxygen ion implanted layer, and then the bonded wafer is oxidized to expose the oxygen ion implanted layer.
- An oxide film having a predetermined thickness is formed on the surface, and then the oxide film is removed.
- the polishing etching process, the oxide film forming process, and the oxide film removing process are also described above. What is necessary is just to carry out similarly to the case of the grinding-polishing method.
- heat treatment is further performed at a temperature of 1100 ° C or lower in a non-acidic atmosphere such as hydrogen or argon gas.
- this heat treatment can achieve further flattening and removal of residual oxides at the bonding interface.
- This effect is more remarkable when the thickness of the insulating film is as thin as 50 ° or less, or when silicon wafers that do not have a strong insulating film are directly bonded together.
- the bonded wafer having excellent film thickness uniformity, flattened surface roughness and few defects can be stably obtained. It is obtained.
- silicon wafers having different crystal orientations are directly bonded (for example, bonding of 110 crystals and 100 crystals, bonding of 111 crystals and 100 crystals, etc.) to produce a bonded wafer Is also possible.
- Two silicon wafers with a diameter of 300 mm were prepared by slicing from a silicon ingot grown with the CZ method and boron as a dopant. From the surface of the silicon wafer for the active layer, acceleration voltage: 150 keV, dose: 5.0 Oxygen ions were implanted under conditions of X 10 16 atoms / cm 2 . As a result, an oxygen ion implanted layer was formed at a depth of about 300 ° for the surface force of the active layer wafer.
- the wafer for active layer of the bonded wafer was ground from the surface by a predetermined thickness using a grinding apparatus. Then, a part of the active layer wafer (film thickness: about 5 m) was left on the surface side of the oxygen ion implanted layer.
- the surface of the bonded wafer after polishing was polished while supplying an abrasive containing abrasive grains having an abrasive grain (silica) concentration of 1% by mass or less to expose the oxygen ion implanted layer.
- an abrasive an alkaline solution having an abrasive concentration of 1% by mass or less was used. It was confirmed that the obtained oxygen ion implanted layer was uniformly formed in the surface of the bonded wafer.
- the bonded wafer was subjected to a wet oxidation treatment at a temperature of 950 ° C. for 0.5 hours in an oxidizing atmosphere.
- a wet oxidation treatment at a temperature of 950 ° C. for 0.5 hours in an oxidizing atmosphere.
- an oxide film having a thickness of 150 nm was formed on the exposed surface of the oxygen ion implanted layer.
- the oxide film was removed by HF cleaning.
- Two silicon wafers with a diameter of 300 mm were prepared by slicing from a silicon ingot grown using the CZ method and boron as a dopant, and an acceleration voltage of 50 keV and a dose amount were applied to the surface of the silicon wafer to be the active layer wafer.
- Hydrogen ions were implanted under the condition of 1.0 X 10 17 atoms / cm 2 . As a result, the surface area of the active layer wafer is approximately 450 nm deep. An on-injection layer was formed.
- peeling heat treatment was performed.
- the peeling heat treatment conditions at this time were maintained for 30 minutes in a nitrogen gas atmosphere at 500 ° C.
- hydrogen gas bubbles were formed in the hydrogen ion implanted layer, and a part of the bonded wafer (a part of the active layer wafer) was peeled off at the boundary of the hydrogen ion implanted layer where the bubbles were formed.
- a bonded wafer was formed.
- oxygen ions were also injected as the peel force of the bonded wafer.
- the implantation conditions at this time were an acceleration voltage: 40 keV and a dose amount: 5.0 ⁇ 10 16 atoms / cm 2 .
- an oxygen ion implantation layer was formed at a depth of about 50 nm on the peeling surface of the bonded wafer.
- heat treatment was performed at 1200 ° C. for 1 hour in an argon gas atmosphere.
- the surface of the bonded wafer was polished while supplying an abrasive having an abrasive concentration of 1% by mass or less to expose the surface of the oxygen ion implanted layer.
- This polishing method is the same as in Example 1 described above.
- wet oxidation treatment was performed at 950 ° C. for 0.5 hour in an oxidizing atmosphere to form a 150-nm thick oxide film on the exposed surface of the oxygen ion implantation layer. Subsequently, the acid film was removed by HF washing.
- the surface roughness was measured using an atomic force microscope, and the presence or absence of defects near the surface was examined using a cross-sectional TEM.
- Two silicon wafers with a diameter of 300 mm were prepared by slicing from a silicon ingot grown with the CZ method and boron as a dopant. From the surface of the silicon wafer for the active layer , Accelerating voltage: 150 keV, dose amount: 5.0 X 10 16 atoms / cm 2 , oxygen ions were implanted, and then the surface into which oxygen ions were implanted without heat treatment was used as the bonding surface. And pasted directly.
- polishing 1 and polishing were performed in the same manner as in Example 1 to expose the surface of the oxygen ion implanted layer.
- the surface roughness was measured using an atomic force microscope, and the presence or absence of defects near the surface was investigated using a cross-sectional TEM.
- Example 2 the surface of the bonded wafer without heat treatment was polished in the same manner as in Example 2 to expose the surface of the oxygen ion implanted layer.
- the surface roughness was measured using an atomic force microscope, and the presence or absence of defects near the surface was investigated using a cross-sectional TEM.
- a bonded wafer was produced in the same flow as in Example 1 except that an oxygen film was formed on the active layer wafer into which oxygen was implanted.
- the bonded wafer obtained had a surface roughness that was free from defects, as in Example 1, with a thickness of 5 to 6 nm.
- a bonded wafer was produced in the same flow as in Example 2 except that five oxide films were formed on the active layer wafer before hydrogen injection.
- the bonded wafer obtained had a surface roughness of 5 to 6 nm with no defects as in Example 2.
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Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/064,605 US8048769B2 (en) | 2006-07-04 | 2007-07-04 | Method for producing bonded wafer |
EP07768139A EP1936664A4 (en) | 2006-07-04 | 2007-07-04 | PROCESS FOR PRODUCING BOUNDED WAFER |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2006-184237 | 2006-07-04 | ||
JP2006184237A JP2008016534A (ja) | 2006-07-04 | 2006-07-04 | 貼り合わせウェーハの製造方法 |
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PCT/JP2007/063387 WO2008004591A1 (fr) | 2006-07-04 | 2007-07-04 | Procédé de production d'une tranche liée |
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US (1) | US8048769B2 (ja) |
EP (1) | EP1936664A4 (ja) |
JP (1) | JP2008016534A (ja) |
CN (1) | CN101356622A (ja) |
TW (1) | TWI355711B (ja) |
WO (1) | WO2008004591A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7855132B2 (en) | 2007-04-03 | 2010-12-21 | Sumco Corporation | Method of manufacturing bonded wafer |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
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JP5499428B2 (ja) | 2007-09-07 | 2014-05-21 | 株式会社Sumco | 貼り合わせウェーハの製造方法 |
EP2075830A3 (en) | 2007-10-11 | 2011-01-19 | Sumco Corporation | Method for producing bonded wafer |
KR101032564B1 (ko) | 2008-04-11 | 2011-05-06 | 가부시키가이샤 사무코 | 접합 웨이퍼의 제조 방법 |
JP2009272471A (ja) * | 2008-05-08 | 2009-11-19 | Sumco Corp | 貼り合わせウェーハの製造方法 |
JP2009289948A (ja) * | 2008-05-29 | 2009-12-10 | Sumco Corp | 貼り合わせウェーハの製造方法 |
JP5597915B2 (ja) * | 2008-08-12 | 2014-10-01 | 株式会社Sumco | 貼り合わせウェーハの製造方法 |
JP5766901B2 (ja) * | 2008-11-28 | 2015-08-19 | 株式会社Sumco | 貼り合わせウェーハの製造方法 |
US11932535B2 (en) * | 2018-03-28 | 2024-03-19 | Sumitomo Precision Products Co., Ltd. | MEMS device manufacturing method, MEMS device, and shutter apparatus using the same |
Citations (5)
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WO2000024059A1 (fr) * | 1998-10-16 | 2000-04-27 | Shin-Etsu Handotai Co., Ltd. | Procede de production de tranche soi utilisant un procede de separation d'implantation d'ions hydrogene et tranche soi produite a l'aide du procede |
WO2004010505A1 (ja) * | 2002-07-18 | 2004-01-29 | Shin-Etsu Handotai Co.,Ltd. | Soiウェーハおよびその製造方法 |
WO2004064145A1 (ja) * | 2003-01-10 | 2004-07-29 | Shin-Etsu Handotai Co., Ltd. | Soiウエーハの製造方法及びsoiウエーハ |
WO2005067053A1 (ja) * | 2004-01-08 | 2005-07-21 | Sumco Corporation | Soiウェーハの作製方法 |
WO2005074033A1 (ja) * | 2004-01-30 | 2005-08-11 | Sumco Corporation | Soiウェーハの製造方法 |
Family Cites Families (6)
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WO2003046993A1 (fr) | 2001-11-29 | 2003-06-05 | Shin-Etsu Handotai Co.,Ltd. | Procede de production de plaquettes soi |
JP4147577B2 (ja) | 2002-07-18 | 2008-09-10 | 信越半導体株式会社 | Soiウェーハの製造方法 |
TW200428637A (en) * | 2003-01-23 | 2004-12-16 | Shinetsu Handotai Kk | SOI wafer and production method thereof |
JP2005340348A (ja) * | 2004-05-25 | 2005-12-08 | Sumco Corp | Simox基板の製造方法及び該方法により得られるsimox基板 |
JP5168788B2 (ja) * | 2006-01-23 | 2013-03-27 | 信越半導体株式会社 | Soiウエーハの製造方法 |
US7977221B2 (en) * | 2007-10-05 | 2011-07-12 | Sumco Corporation | Method for producing strained Si-SOI substrate and strained Si-SOI substrate produced by the same |
-
2006
- 2006-07-04 JP JP2006184237A patent/JP2008016534A/ja active Pending
-
2007
- 2007-07-04 US US12/064,605 patent/US8048769B2/en active Active
- 2007-07-04 TW TW096124368A patent/TWI355711B/zh active
- 2007-07-04 EP EP07768139A patent/EP1936664A4/en not_active Withdrawn
- 2007-07-04 WO PCT/JP2007/063387 patent/WO2008004591A1/ja active Application Filing
- 2007-07-04 CN CNA2007800012350A patent/CN101356622A/zh active Pending
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2000024059A1 (fr) * | 1998-10-16 | 2000-04-27 | Shin-Etsu Handotai Co., Ltd. | Procede de production de tranche soi utilisant un procede de separation d'implantation d'ions hydrogene et tranche soi produite a l'aide du procede |
WO2004010505A1 (ja) * | 2002-07-18 | 2004-01-29 | Shin-Etsu Handotai Co.,Ltd. | Soiウェーハおよびその製造方法 |
WO2004064145A1 (ja) * | 2003-01-10 | 2004-07-29 | Shin-Etsu Handotai Co., Ltd. | Soiウエーハの製造方法及びsoiウエーハ |
WO2005067053A1 (ja) * | 2004-01-08 | 2005-07-21 | Sumco Corporation | Soiウェーハの作製方法 |
WO2005074033A1 (ja) * | 2004-01-30 | 2005-08-11 | Sumco Corporation | Soiウェーハの製造方法 |
Non-Patent Citations (1)
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7855132B2 (en) | 2007-04-03 | 2010-12-21 | Sumco Corporation | Method of manufacturing bonded wafer |
Also Published As
Publication number | Publication date |
---|---|
CN101356622A (zh) | 2009-01-28 |
JP2008016534A (ja) | 2008-01-24 |
TW200816368A (en) | 2008-04-01 |
EP1936664A4 (en) | 2011-02-23 |
US8048769B2 (en) | 2011-11-01 |
US20100015779A1 (en) | 2010-01-21 |
TWI355711B (en) | 2012-01-01 |
EP1936664A1 (en) | 2008-06-25 |
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