WO2017072994A1 - 貼り合わせsoiウェーハの製造方法 - Google Patents
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- WO2017072994A1 WO2017072994A1 PCT/JP2016/003916 JP2016003916W WO2017072994A1 WO 2017072994 A1 WO2017072994 A1 WO 2017072994A1 JP 2016003916 W JP2016003916 W JP 2016003916W WO 2017072994 A1 WO2017072994 A1 WO 2017072994A1
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 29
- 230000003647 oxidation Effects 0.000 claims abstract description 36
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 36
- 238000000034 method Methods 0.000 claims abstract description 34
- 238000010438 heat treatment Methods 0.000 claims abstract description 33
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000007789 gas Substances 0.000 claims abstract description 25
- 238000005468 ion implantation Methods 0.000 claims abstract description 25
- 229910052786 argon Inorganic materials 0.000 claims abstract description 20
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 13
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 13
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 12
- 150000002500 ions Chemical class 0.000 claims description 11
- 229910052710 silicon Inorganic materials 0.000 claims description 11
- 239000010703 silicon Substances 0.000 claims description 11
- 239000013078 crystal Substances 0.000 claims description 5
- 239000001257 hydrogen Substances 0.000 claims description 5
- 229910052739 hydrogen Inorganic materials 0.000 claims description 5
- -1 hydrogen ions Chemical class 0.000 claims description 4
- 239000002245 particle Substances 0.000 abstract description 14
- 235000012431 wafers Nutrition 0.000 description 97
- 239000010408 film Substances 0.000 description 86
- 230000002093 peripheral effect Effects 0.000 description 21
- 238000000137 annealing Methods 0.000 description 15
- 238000000926 separation method Methods 0.000 description 9
- 239000010409 thin film Substances 0.000 description 9
- 230000015572 biosynthetic process Effects 0.000 description 6
- 238000004140 cleaning Methods 0.000 description 6
- 230000003628 erosive effect Effects 0.000 description 6
- 238000001878 scanning electron micrograph Methods 0.000 description 5
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 4
- 229910004298 SiO 2 Inorganic materials 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 230000003746 surface roughness Effects 0.000 description 3
- 230000001133 acceleration Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002513 implantation Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Chemical compound [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 238000009832 plasma treatment Methods 0.000 description 1
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 1
- 229920005591 polysilicon Polymers 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
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- 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
- H01L21/185—Joining of semiconductor bodies for junction formation
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- 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
- H01L21/76254—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 with separation/delamination along an ion implanted layer, e.g. Smart-cut, Unibond
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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
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02225—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer
- H01L21/0226—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process
- H01L21/02293—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process formation of epitaxial layers by a deposition process
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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
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- 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
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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
- H01L21/18—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
- H01L21/324—Thermal treatment for modifying the properties of semiconductor bodies, e.g. annealing, sintering
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- 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
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- 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
- H01L21/76243—Dielectric regions, e.g. EPIC dielectric isolation, LOCOS; Trench refilling techniques, SOI technology, use of channel stoppers using semiconductor on insulator [SOI] technology using silicon implanted buried insulating layers, e.g. oxide layers, i.e. SIMOX techniques
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- H01L21/77—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate
- H01L21/78—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices
- H01L21/7806—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices involving the separation of the active layers from a substrate
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- H01L27/12—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body
Definitions
- the present invention relates to a method for manufacturing a bonded SOI wafer, and more particularly, to a method for manufacturing an SOI wafer using an ion implantation separation method.
- An SOI (Silicon on Insulator) wafer manufacturing method is a method of manufacturing an SOI wafer by peeling an ion-implanted wafer after bonding (ion)
- An injection peeling method a technique called a smart cut method (registered trademark)) has attracted attention.
- an oxide film is formed on at least one of two silicon wafers, and gas ions such as hydrogen ions or rare gas ions are implanted from the upper surface of one silicon wafer (bond wafer),
- An ion implantation layer (also referred to as a microbubble layer or an encapsulation layer) is formed inside the wafer.
- the surface into which the ions are implanted is brought into close contact with the other silicon wafer (base wafer) through an oxide film, and then a heat treatment (peeling heat treatment) is applied to form a microbubble layer as a cleaved surface on one wafer (bond wafer).
- a heat treatment peeling heat treatment
- there is a method of firmly bonding the peeled SOI wafer by applying a heat treatment (bonding heat treatment) (see Patent Document 1).
- the cleaved surface is the surface of the SOI layer, and an SOI wafer having a thin SOI film thickness and high uniformity can be obtained relatively easily.
- a damaged layer due to ion implantation exists on the surface of the SOI wafer after peeling, and the surface roughness is larger than that of a normal mirror surface of a silicon wafer. Therefore, in the ion implantation separation method, it is necessary to remove such a damaged layer and surface roughness.
- One method of removing the surface roughness and damage layer on the SOI layer surface is an annealing method in which high-temperature heat treatment is performed in an argon-containing atmosphere. According to this annealing method, the film thickness uniformity of the SOI layer obtained by the ion implantation separation method can be kept high while the surface of the SOI layer is planarized (Patent Documents 1 and 2).
- a bonded SOI wafer having a BOX layer (embedded oxide film layer) and an SOI layer on a base wafer is manufactured by ion implantation separation, and is separated by heat treatment in an argon gas-containing atmosphere (hereinafter also simply referred to as Ar annealing).
- Ar annealing an argon gas-containing atmosphere
- the present invention has been made in view of the above problems, and in the production of a bonded SOI wafer, particles from the outermost peripheral portion of the SOI layer remaining in an overhanging state by planarization heat treatment in an argon gas-containing atmosphere are provided.
- the purpose is to prevent the occurrence of this.
- the present invention forms an ion-implanted layer by ion-implanting at least one gas ion of hydrogen ions or rare gas ions from the surface of a bond wafer made of a silicon single crystal, After bonding the ion-implanted surface of the wafer and the surface of the base wafer made of a silicon single crystal through a silicon oxide film, the bond wafer is peeled off by the ion-implanted layer, whereby the surface of the base wafer is removed.
- a bonded SOI wafer having a BOX layer and an SOI layer is manufactured, and a planarization heat treatment is performed on the bonded SOI wafer in an argon gas-containing atmosphere, and then a sacrificial oxidation process is performed to adjust the film thickness of the SOI layer.
- the bonded SOI wafer manufacturing method to be performed the bonded SOI wafer produced by the peeling
- the thickness of the BOX layer is more than 500nm in Doha,
- the relationship between the film thickness (t) of the SOI layer subjected to the sacrificial oxidation treatment and the film thickness (d) of the sacrificial oxide film formed in the sacrificial oxidation treatment satisfies 0.9d>t> 0.45d.
- the present invention provides a method for manufacturing a bonded SOI wafer, wherein the sacrificial oxide film is formed.
- the thickness (t) of the SOI layer immediately before the sacrificial oxidation treatment is performed after performing the planarization heat treatment in the argon gas-containing atmosphere on the bonded SOI wafer having the BOX layer thickness of 500 nm or more.
- the argon gas-containing atmosphere is preferably 100% Ar gas.
- a silicon oxide film having a thickness of 500 nm or more is formed on the base wafer, the base wafer on which the silicon oxide film is formed, and the ion-implanted surface of the bond wafer are bonded together, and then the ion It is preferable to produce the bonded SOI wafer in which the thickness of the BOX layer is 500 nm or more by peeling the bond wafer with an injection layer.
- an epitaxial layer can also be formed on the surface of the SOI layer after the sacrificial oxidation treatment.
- a bonded SOI wafer is manufactured by the ion implantation delamination method as in the present invention
- a thin SOI layer thinner than 1 ⁇ m is usually used. Limited. Therefore, in order to manufacture a bonded SOI wafer having an SOI layer having a thick film thickness of several ⁇ m or more and high film thickness uniformity, the surface of the thin film SOI layer manufactured by the ion implantation separation method is epitaxially formed. Additional layers need to be formed.
- the sacrificial oxide film thickness is adjusted so that the overhanging outermost peripheral portion of the SOI layer is completely changed to the sacrificial oxide film. Generation of particles from the outermost peripheral portion of the SOI layer remaining in a hang shape can be prevented in advance.
- a bonding heat treatment may be performed in an oxidizing atmosphere in order to increase the bonding force at the bonding interface between the SOI layer 11 and the base wafer 12 after separation.
- a surface oxide film 13 is formed on the surface of the SOI layer 11 after peeling by bonding heat treatment (FIG. 2A).
- the surface oxide film 13 formed by the bonding heat treatment is removed by, for example, hydrofluoric acid (FIG. 2B).
- the bonded SOI wafer from which the surface oxide film 13 has been removed is subjected to high-temperature heat treatment (Ar annealing) in an argon-containing atmosphere (FIG. 2C).
- Ar annealing high-temperature heat treatment
- migration occurs in the silicon atoms on the surface of the SOI layer 11 and the surface of the SOI layer 11 is flattened.
- the Si / SiO 2 interface SOI / BOX interface 15 and BOX / At the base wafer interface 16
- SiO is vaporized (Si + SiO 2 ⁇ 2SiO), and the erosion of the interface proceeds. For this reason, a state in which the thin film (SOI + BOX) is widely peeled is formed, and the outermost peripheral portion of the SOI layer 11 remains in an overhang shape.
- a sacrificial oxidation process formation of sacrificial oxide film 17 (FIG. 2 (d)) + oxide film removal (FIG. 2 (e)) is performed to adjust the film thickness of the SOI layer. If the thickness of the sacrificial oxide film 17 thus formed is insufficient, the outer peripheral portion of the SOI layer remains thin in an overhang state after the oxide film is removed, so that the outer peripheral portion of the thin SOI layer is washed It will be peeled off in the later process.
- the present inventor has found that when the thickness of the BOX layer is 500 nm or more, peeling of the thin film (SOI + BOX) becomes remarkable, a wider overhang shape is formed, and generation of particles becomes remarkable. discovered. Then, for a bonded SOI wafer having a BOX layer thickness of 500 nm or more, the sacrificial oxide film thickness is changed so that the overhanging outer peripheral portion of the SOI layer completely changes to an oxide film in the sacrificial oxidation after Ar annealing. It was found that the generation of particles from the outermost peripheral portion of the SOI layer remaining in an overhanging state can be prevented beforehand by adjusting.
- FIG. 1 shows a process flow diagram showing an example of a method for manufacturing a bonded SOI wafer of the present invention.
- FIG. 3 is an explanatory view showing an example of a method for manufacturing a bonded SOI wafer according to the present invention.
- At least one gas ion of hydrogen ions or rare gas ions is ion-implanted from the surface of a bond wafer made of silicon single crystal to form an ion-implanted layer at a predetermined depth of the bond wafer (FIG. 1A). )).
- a silicon oxide film that will later become a BOX layer (film thickness of 500 nm or more) is formed on the bond wafer and / or the base wafer.
- the acceleration voltage for ion implantation needs to be extremely high, so that an ion implantation apparatus capable of high voltage ion implantation is required. Therefore, in the present invention, it is preferable to form a silicon oxide film of 500 nm or more on the base wafer (FIG. 1B).
- a silicon oxide film may be formed on both the bond wafer and the base wafer, and the total thickness thereof may be 500 nm or more.
- the bond wafer on which the silicon oxide film is formed and the ion-implanted surface of the bond wafer are bonded together (FIG. 1C).
- the bond wafer and the base wafer are brought into contact with each other in a clean atmosphere at room temperature, whereby the wafers are bonded to each other without using an adhesive or the like.
- a peeling heat treatment for example, if a heat treatment is usually performed at 400 ° C. to 700 ° C. for 30 minutes or more in an inert gas atmosphere such as Ar, the bond wafer can be peeled off by the ion implantation layer.
- plasma treatment on the bonding surface in advance it is possible to perform peeling by applying an external force without performing heat treatment (or after performing heat treatment at a temperature that does not peel).
- the upper limit of the thickness of the buried oxide film layer can be set to 5 ⁇ m, for example.
- a bonding heat treatment in an oxidizing atmosphere may be performed, and then a treatment for removing the formed surface oxide film may be performed.
- implantation damage generated during ion implantation remaining on the peeled surface can be removed.
- planarization heat treatment is performed on the manufactured bonded SOI wafer in an argon gas-containing atmosphere.
- the bonded SOI wafer has Si / SiO 2 interfaces at the interface between the SOI layer and the BOX layer and at the interface between the BOX layer and the base wafer.
- the thermal oxide film 3 is formed on the base wafer 2 (FIG. 3A), bonded to a bond wafer without an oxide film, and a bonded SOI wafer is manufactured by an ion implantation separation method (
- FIG. 3B the interface A between the SOI layer 1 and the BOX layer 3 becomes a bonding interface, and the interface B between the BOX layer 3 and the base wafer 2 becomes a thermal oxide film interface.
- FIG. 3C compressive strain is stored inside the thermal oxide film 3 (BOX layer) formed on the base wafer 2.
- the internal stress in the BOX layer 3 increases as the thickness of the BOX layer 3 increases, peeling increases more easily as the thickness of the BOX layer 3 increases. If the thickness of the BOX layer 3 is 500 nm or more as in the present invention, the thin film (SOI + BOX) peels off significantly, and a wider overhang shape is formed.
- Such a phenomenon occurs in an argon-containing atmosphere (for example, a mixed gas atmosphere of argon and hydrogen or a 100% Ar gas atmosphere).
- a 100% Ar gas atmosphere a high temperature for a long time (1150 ° C. or higher) It occurs remarkably by heat treatment for 30 minutes or more.
- BOX layer 3 SOI layer 1: SEM image of bonded SOI wafer with thin film (SOI + BOX) peeled widely when Ar anneal is performed on bonded wafer having film thickness of 1000 nm and SOI layer 1: film thickness of 750 nm Shown in 4 (A). Further, FIG. 4B shows an SEM image in which erosion at the SOI / BOX interface A has progressed, and FIG. 4C shows an SEM image in which erosion has progressed at the BOX / base wafer interface B.
- sacrificial oxidation treatment for adjusting the film thickness of the SOI layer 1 is performed (FIG. 1 (F), FIG. 3 (F), FIG. 3 (G)).
- the sacrificial oxide film thickness is adjusted by adjusting the sacrificial oxidation conditions so that the overhanging outer peripheral portion of the SOI layer 1 is completely changed to the sacrificial oxide film 4.
- the sacrificial oxide film thickness (d) is adjusted so that the relationship with the sacrificial oxide film thickness (d) formed on one surface satisfies 2 ⁇ 0.45d> t. That's fine.
- the SOI layer is overhanged. It is possible to suppress the generation of particles due to this portion.
- the conditions for the sacrificial oxidation heat treatment are not particularly limited as long as the sacrificial oxide film can be formed so that the film thickness satisfies 0.9d> t> 0.45d, but for example, about 900 to 950 ° C.
- the sacrificial oxide film formed in the sacrificial oxidation treatment is removed (FIG. 3G).
- the outer peripheral portion of the SOI layer that has been overhanged after Ar annealing is completely removed.
- an oxide film removal method for example, there is a method of performing 15% HF cleaning and, if necessary, RCA cleaning.
- the sacrificial oxide film thickness is such that the overhanging outermost peripheral portion of the SOI layer completely changes to an oxide film.
- a bonded SOI wafer having a relatively thick SOI layer film thickness can be obtained by further forming an epitaxial layer on the surface of the SOI layer after the sacrificial oxidation treatment.
- the end surface of the BOX layer is more than the end surface of the SOI layer. It becomes a concave structure.
- the occurrence of defects such as a valley-shaped step between the epitaxial layer grown from the epitaxial layer and the epitaxial layer grown from the terrace portion can be prevented.
- a bonded SOI wafer is prepared by bonding a bond wafer subjected to ion implantation to a base wafer with a silicon oxide film having a thickness of 600 nm and peeling the bond wafer with an ion-implanted layer according to the manufacturing conditions shown in Table 1 below. Was made. Thereafter, the bonding heat treatment and the oxide film formed by the bonding heat treatment were removed, and then a planarization heat treatment was performed in a 100% Ar gas atmosphere.
- the SOI film thickness after Ar annealing was 490 nm (Example) and 415 nm (Comparative Example), respectively.
- sacrificial oxidation treatment for adjusting the SOI layer was performed under the conditions described in Table 1, and then SC1 cleaning (80 ° C., 3 minutes) was performed in a separate cleaning tank. Then, using a particle counter (SP2 manufactured by KLA Tencor), particles (diameter of 0.25 ⁇ m or more) adhering to the surface were measured and compared.
- the present invention is not limited to the above embodiment.
- the above-described embodiment is an exemplification, and the present invention has substantially the same configuration as the technical idea described in the claims of the present invention, and any device that exhibits the same function and effect is the present invention. It is included in the technical scope of the invention.
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Abstract
Description
前記犠牲酸化処理を施す前記SOI層の膜厚(t)と、前記犠牲酸化処理において形成する犠牲酸化膜の膜厚(d)との関係が、0.9d>t>0.45dを満たすように前記犠牲酸化膜を形成することを特徴とする貼り合わせSOIウェーハの製造方法を提供する。
Claims (4)
- シリコン単結晶からなるボンドウェーハの表面から水素イオン又は希ガスイオンのうち少なくとも1種類のガスイオンをイオン注入してイオン注入層を形成し、前記ボンドウェーハの前記イオン注入した表面と、シリコン単結晶からなるベースウェーハの表面とをシリコン酸化膜を介して貼り合わせた後、前記イオン注入層で前記ボンドウェーハを剥離することにより、前記ベースウェーハ上にBOX層とSOI層とを有する貼り合わせSOIウェーハを作製し、該貼り合わせSOIウェーハに対してアルゴンガス含有雰囲気で平坦化熱処理を行った後、前記SOI層の膜厚を調整する犠牲酸化処理を行う貼り合わせSOIウェーハの製造方法において、
前記剥離により作製された貼り合わせSOIウェーハにおける前記BOX層の膜厚を500nm以上とし、
前記犠牲酸化処理を施す前記SOI層の膜厚(t)と、前記犠牲酸化処理において形成する犠牲酸化膜の膜厚(d)との関係が、0.9d>t>0.45dを満たすように前記犠牲酸化膜を形成することを特徴とする貼り合わせSOIウェーハの製造方法。 - 前記アルゴンガス含有雰囲気を100%Arガスとすることを特徴とする請求項1に記載の貼り合わせSOIウェーハの製造方法。
- 前記ベースウェーハに500nm以上のシリコン酸化膜を形成し、該シリコン酸化膜を形成したベースウェーハと、前記ボンドウェーハの前記イオン注入した表面とを貼り合わせた後、前記イオン注入層で前記ボンドウェーハを剥離することにより、前記BOX層の膜厚が500nm以上である前記貼り合わせSOIウェーハを作製することを特徴とする請求項1又は請求項2に記載の貼り合わせSOIウェーハの製造方法。
- 前記犠牲酸化処理後の前記SOI層の表面にエピタキシャル層を形成することを特徴とする請求項1から請求項3のいずれか一項に記載の貼り合わせSOIウェーハの製造方法。
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