WO2001048825A1 - Procédé de production de tranche collée - Google Patents
Procédé de production de tranche collée Download PDFInfo
- Publication number
- WO2001048825A1 WO2001048825A1 PCT/JP2000/008945 JP0008945W WO0148825A1 WO 2001048825 A1 WO2001048825 A1 WO 2001048825A1 JP 0008945 W JP0008945 W JP 0008945W WO 0148825 A1 WO0148825 A1 WO 0148825A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- wafer
- bonded
- silicon
- heat treatment
- oxide film
- Prior art date
Links
Classifications
-
- 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 at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System 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
-
- 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
- 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
Definitions
- the present invention relates to a so-called ion implantation delamination method in which a wafer into which hydrogen or a rare gas ion is implanted is peeled after heat treatment to produce a bonded wafer, and more particularly to a lamination with less occurrence of bonding defects called voids on a lamination surface.
- the present invention relates to a method for manufacturing a combined SOI wafer.
- the bonded wafer whose bonding strength has been increased by heat treatment can be ground and polished later, so the wafer on the element manufacturing side must be reduced to a desired thickness by grinding and polishing. Accordingly, an SOI layer for forming an element can be formed.
- the bonded SOI wafer manufactured in this way has the advantages of excellent crystallinity of the SOI layer and high reliability of the buried oxide film directly under the SOI layer.Since it is thinned by force grinding and polishing, It takes time to thin the film and the material This was wasted, and the film thickness uniformity was at most only the target film thickness ⁇ 0.3 m. On the other hand, with the recent increase in the integration and speed of semiconductor devices, the thickness of the SOI layer is required to be further reduced in thickness and the uniformity of the film thickness is increased. 0
- a film thickness of about 1 m and film thickness uniformity are required.
- an oxide film is formed on at least one of the two silicon wafers, and hydrogen ions or diluted ions are formed from the upper surface of one of the silicon wafers.
- the other wafer is brought into close contact with the ion-implanted surface via an oxide film, and then subjected to heat treatment (peeling heat treatment).
- one of the wafers is peeled off as a thin film using the microbubble layer as a cleavage plane (separation plane), and further heat treatment (bonding heat treatment) is applied to make the SOI wafer tightly bonded.
- further heat treatment bonding heat treatment
- the cleavage plane is a good mirror surface and the uniformity of the SOI layer is extremely high.
- O I wafers can be obtained relatively easily, and since the peeled thin film wafers can be reused, there is an advantage that the material can be used effectively.
- this method can directly connect silicon wafers without passing through an oxide film. Not only can silicon wafers be bonded together, but also silicon wafers can be bonded together. Ion-implanted into a wafer and bonded to insulating wafers with different coefficients of thermal expansion such as quartz, silicon carbide, and alumina, or by ion-implanting into an insulating wafer and bonding to other wafers. It is also used to produce # 18 having a thin film of
- the ion-implanted wafer is combined with the other wafer after passing through RCA cleaning and organic substance removal cleaning.
- the RCA cleaning, SC- 1 (NH 4 OH / H 2 0 2 / H 2 0 mixture) and SC- 2 (HC1) It is a typical cleaning method in the semiconductor process based on two types of cleaning liquids (mixed liquid), and can mainly remove impurities such as particles, organic substances, and metal contamination.
- the void generation rate could not always be suppressed to a satisfactory level.
- a small size that is only observed after a bonding heat treatment or after a process called a sticky brush that slightly polishes the peeled surface after the bonding heat treatment Some voids (less than 1 mm) were generated, and their reduction was required. Disclosure of the invention
- the present inventors have conducted a detailed investigation on the voids generated even after the normal cleaning process as described above, and found that impurities such as particles and organic substances attached in the ion implantation process are caused by conventional chemical processes. It is evident that this is likely to occur if the residual is not completely removed by mechanical cleaning or if the surface of the wafer becomes rough due to ion implantation. became.
- the present invention has been completed based on the idea of using a physical removal method to remove impurities such as residual particles and surface roughness. As a specific method of physically removing impurities, for example, CMP can be used.
- This CMP polishing can physically remove impurities such as particles and organic substances that cannot be removed by chemical cleaning existing on the ion-implanted surface, and can improve the surface roughness generated in the ion-implantation process.
- the cause of the occurrence of the code can be eliminated.
- CMP in the present invention is defined.
- CMP Chemical and Mechanical Polishing
- CMP technology is not a new technology, but one that has long been used for mirror polishing of silicon wafers as general chemical mechanical polishing.
- CMP in the narrow sense which has been attracting attention in recent years, is a type of planarization technology in device processes, and typically, planarizes interlayer insulating films such as oxide films and metal films such as wiring. This is a technology mainly based on a physical flattening method. In the present invention, when simply referred to as CMP, it means CMP in a narrow sense.
- FIG. 1 is a flow chart showing an example of a method for manufacturing a bonded SOI wafer according to the present invention, wherein (A) shows a method in which an oxide film is formed only on a base wafer side where no ion implantation is performed, B) is a method in which an oxide film is formed on the bond wafer before ion implantation.
- A shows a method in which an oxide film is formed only on a base wafer side where no ion implantation is performed
- B) is a method in which an oxide film is formed on the bond wafer before ion implantation.
- step (a) two silicon wafers 1 and 2 are prepared, and both wafers are single crystal silicon wafers in which at least the surfaces to be bonded are mirror-polished.
- 1 is a bond wafer (1st ⁇ ha) and 2 is a base wafer (2nd ⁇ ha).
- Step (b) is a step of forming an oxide film 3 on one of the two silicon wafers 1 and 2. Since this oxide film becomes a buried oxide film for the SII wafer, its thickness is set according to the application.
- Step (c) is a step in which ions are implanted into the bond wafer 1 to be the SOI layer. At least one of hydrogen ions or rare gas ions, here hydrogen ions, is implanted from the upper surface of one surface of bond bonder 1 (the surface bonded to base wafer 2), and is parallel to the surface at the average penetration depth of ions. A small microbubble layer (encapsulation layer) 4 is formed, and the wafer temperature during this injection is preferably 450 ° C. or less, more preferably 200 ° C. or less. The implantation energy is appropriately determined according to the target thickness of the SOI layer of the SOI wafer to be manufactured.
- the implantation is performed at a slightly inclined implantation angle so as to be non-parallel to the crystal axis of Bonduewa 1. It's better to do that.
- the two wafers 1 and 2 are bonded after a cleaning step (chemical cleaning method).
- Impurity removal treatment (d) for removing impurities adhering to the surface is performed.
- a physical method is used for this impurity removal treatment (d).
- CMP for example, hard foamed polyurethane or the like is used as a polishing cloth, and as a polishing slurry, fumed silica to which an alkali such as potassium hydroxide or ammonia is added is used.
- Brush cleaning is a method of rubbing the surface of the wafer with a brush (made of, for example, polyvinyl alcohol) while flowing pure water or an alkaline aqueous solution.
- Such a method of physically removing particles and the like adhering to the wafer surface is based on whether the surface is a silicon surface (flow in FIG. 1 (A)) or an oxide film surface (FIG. 1 (B)).
- the method can be applied irrespective of the flow, and the void source can be removed very effectively.
- CMP physically removes contaminants such as particles on the wafer surface as well as the underlying silicon oxide film and the like, so that the surface roughness generated in the ion implantation process can be improved.
- the surface of the ion-implanted wafer is subjected to an impurity removal treatment (d) by a physical treatment such as CMP, and then the other wafer 2 (base wafer) is overlapped and brought into close contact.
- an impurity removal treatment d
- CMP chemical vapor deposition
- the other wafer 2 base wafer
- an oxide film can be formed on the surface of the other wafer 2 (base wafer) in the flow of FIG. 1 (B) if necessary.
- the encapsulation layer formed by ion implantation is separated at a boundary.
- This is a separation heat treatment process that separates the separation wafer 5 and the SOI wafer 6 (SOI layer 7 + buried oxide film 3 '+ base wafer 2) according to the following conditions: 400 to 600 ° C in an inert gas atmosphere or an oxidizing gas atmosphere. If a heat treatment is applied at a temperature of about the same level, separation of the wafer 5 and separation of the SII wafer 6 due to crystal rearrangement and agglomeration of bubbles will occur, and at the same time, the bonding surface at room temperature will be firmly bonded to some extent.
- the peeling wafers 5 and 5 'in the flow shown in FIGS. 1 (A) and (B) can be reused by removing the oxide film on the surface and polishing the peeled surface if necessary. is there.
- the bonding strength by the peeling heat treatment in the step (f) is not sufficient. Therefore, high-temperature heat treatment is performed as the bonding heat treatment in the step (g) to sufficiently increase the bonding strength.
- This heat treatment can be performed, for example, in an inert gas atmosphere or an oxidizing gas atmosphere at 1,000 ° C. to 1200 ° C. for about 30 minutes to 5 hours. If a rapid heating / cooling device such as a lamp heating device is used, a sufficient bonding strength can be obtained in a short time of about 1 to 300 seconds at a temperature of 1,000 ° C to 1350 ° C.
- step (f) when the bonding heat treatment in the step (g) is performed also as the peeling heat treatment in the step (f), the step (f) can be omitted.
- the step (h) is a mirror polishing step for removing the damage layer and the surface roughness present on the cleavage plane (peeled surface) which is the surface of the SII layer.
- polishing with a very small polishing allowance called a touch polishing or heat treatment in a reducing atmosphere containing hydrogen after the touch polishing can be performed, but without performing the touch polishing. Even if only the heat treatment is performed in a reducing atmosphere containing hydrogen, the damage layer and the surface roughness can be similarly removed, and the combined heat treatment in the step (g) can be performed more efficiently.
- the present invention is not limited to the above embodiment.
- the process of manufacturing an SOI wafer by bonding two silicon wafers via an oxide film by an ion implantation delamination method has been described, but the present invention provides another method of manufacturing a bonded wafer. , that is, after the ion implantation, not only bonded by bonding directly Siri Konwe Doha each other without interposing an oxide film, and ion implantation Shirikonwe one tooth, which the S i ⁇ 2, S i C, a it can also be applied to a case of manufacturing 1 2 ⁇ 3 like insulating Ueha directly bonded to SOI Uweha a.
- the present invention excites the hydrogen ions to perform the ion implantation in a plasma state, and performs room temperature without performing a special heat treatment. It can also be applied to a hydrogen ion implantation stripping method in which stripping is performed by using the method described above.
- Bond wafer table CMP CMP Organic substance removal cleaning + Surface treatment conditions Polishing allowance 100 nm Polishing allowance 100 nm SC-l + SC-2 Peeling heat treatment Nitrogen gas atmosphere 500 ° C, 30 minutes
- the void observed here was the part where the bonding surface was exposed after the touch bolish, and no void exceeding 1 mm in diameter was present in any of the wafers.
- the invention's effect As described above, according to the present invention, when a bonded wafer is formed by an ion implantation separation method, impurities adhered to the wafer surface are physically removed after ion implantation. Organic substances and particles that cannot be removed by cleaning or organic substance removing can be completely removed, and the surface roughness generated in the ion implantation step can be improved by polishing.
- CMP chemical cleaning after physical removal
- the cause of the void defect can be completely removed, and the product yield can be improved.
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/926,049 US6566233B2 (en) | 1999-12-24 | 2000-12-18 | Method for manufacturing bonded wafer |
EP00981791.7A EP1187216B1 (en) | 1999-12-24 | 2000-12-18 | Method for manufacturing bonded wafer |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11-368400 | 1999-12-24 | ||
JP36840099 | 1999-12-24 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001048825A1 true WO2001048825A1 (fr) | 2001-07-05 |
Family
ID=18491724
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2000/008945 WO2001048825A1 (fr) | 1999-12-24 | 2000-12-18 | Procédé de production de tranche collée |
Country Status (5)
Country | Link |
---|---|
US (1) | US6566233B2 (ja) |
EP (1) | EP1187216B1 (ja) |
KR (1) | KR100796249B1 (ja) |
TW (1) | TW511141B (ja) |
WO (1) | WO2001048825A1 (ja) |
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JP2005142524A (ja) * | 2003-04-29 | 2005-06-02 | Soi Tec Silicon On Insulator Technologies | 半導体ウエハの接着前表面処理 |
JP2006179887A (ja) * | 2004-11-26 | 2006-07-06 | Applied Materials Inc | シリコン・オン・インシュレータ搬送ウエハのエッジ除去 |
JP2009111375A (ja) * | 2007-10-10 | 2009-05-21 | Semiconductor Energy Lab Co Ltd | 半導体装置の作製方法 |
JP2011103457A (ja) * | 2009-10-15 | 2011-05-26 | Semiconductor Energy Lab Co Ltd | 半導体装置の作製方法 |
US8258043B2 (en) | 2010-09-24 | 2012-09-04 | National University Corporation Tokyo University Of Agriculture And Technology | Manufacturing method of thin film semiconductor substrate |
JP2018120965A (ja) * | 2017-01-25 | 2018-08-02 | 信越半導体株式会社 | 貼り合わせsoiウェーハの製造方法 |
JP2021525215A (ja) * | 2018-11-15 | 2021-09-24 | 中国科学院上海微系統与信息技術研究所 | 酸化ガリウム半導体構造及びその調製方法 |
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US6900113B2 (en) * | 2000-05-30 | 2005-05-31 | Shin-Etsu Handotai Co., Ltd. | Method for producing bonded wafer and bonded wafer |
US7501303B2 (en) * | 2001-11-05 | 2009-03-10 | The Trustees Of Boston University | Reflective layer buried in silicon and method of fabrication |
US7052974B2 (en) * | 2001-12-04 | 2006-05-30 | Shin-Etsu Handotai Co., Ltd. | Bonded wafer and method of producing bonded wafer |
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JP4820801B2 (ja) | 2006-12-26 | 2011-11-24 | 株式会社Sumco | 貼り合わせウェーハの製造方法 |
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US7858495B2 (en) * | 2008-02-04 | 2010-12-28 | Semiconductor Energy Laboratory Co., Ltd. | Method for manufacturing SOI substrate |
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JP5386856B2 (ja) * | 2008-06-03 | 2014-01-15 | 株式会社Sumco | 貼り合わせウェーハの製造方法 |
JP5470839B2 (ja) * | 2008-12-25 | 2014-04-16 | 株式会社Sumco | 貼り合わせシリコンウェーハの製造方法 |
JP2010251407A (ja) * | 2009-04-13 | 2010-11-04 | Elpida Memory Inc | 半導体装置およびその製造方法 |
FR2953640B1 (fr) | 2009-12-04 | 2012-02-10 | S O I Tec Silicon On Insulator Tech | Procede de fabrication d'une structure de type semi-conducteur sur isolant, a pertes electriques diminuees et structure correspondante |
US20110207306A1 (en) * | 2010-02-22 | 2011-08-25 | Sarko Cherekdjian | Semiconductor structure made using improved ion implantation process |
US8008175B1 (en) | 2010-11-19 | 2011-08-30 | Coring Incorporated | Semiconductor structure made using improved simultaneous multiple ion implantation process |
US8558195B2 (en) | 2010-11-19 | 2013-10-15 | Corning Incorporated | Semiconductor structure made using improved pseudo-simultaneous multiple ion implantation process |
US8196546B1 (en) | 2010-11-19 | 2012-06-12 | Corning Incorporated | Semiconductor structure made using improved multiple ion implantation process |
KR101512393B1 (ko) | 2010-12-27 | 2015-04-16 | 상하이 심구 테크놀로지 주식회사 | 게터링 프로세스를 적용한 절연 매입층을 가진 반도체 기판의 제조방법 |
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- 2000-12-18 EP EP00981791.7A patent/EP1187216B1/en not_active Expired - Lifetime
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- 2000-12-18 US US09/926,049 patent/US6566233B2/en not_active Expired - Lifetime
- 2000-12-18 KR KR1020017009616A patent/KR100796249B1/ko active IP Right Grant
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Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005142524A (ja) * | 2003-04-29 | 2005-06-02 | Soi Tec Silicon On Insulator Technologies | 半導体ウエハの接着前表面処理 |
JP4549726B2 (ja) * | 2003-04-29 | 2010-09-22 | エス.オー.アイ.テック、シリコン、オン、インシュレター、テクノロジーズ | 半導体ウエハの接着前表面処理 |
JP2006179887A (ja) * | 2004-11-26 | 2006-07-06 | Applied Materials Inc | シリコン・オン・インシュレータ搬送ウエハのエッジ除去 |
JP2009111375A (ja) * | 2007-10-10 | 2009-05-21 | Semiconductor Energy Lab Co Ltd | 半導体装置の作製方法 |
JP2011103457A (ja) * | 2009-10-15 | 2011-05-26 | Semiconductor Energy Lab Co Ltd | 半導体装置の作製方法 |
US8258043B2 (en) | 2010-09-24 | 2012-09-04 | National University Corporation Tokyo University Of Agriculture And Technology | Manufacturing method of thin film semiconductor substrate |
JP2018120965A (ja) * | 2017-01-25 | 2018-08-02 | 信越半導体株式会社 | 貼り合わせsoiウェーハの製造方法 |
JP2021525215A (ja) * | 2018-11-15 | 2021-09-24 | 中国科学院上海微系統与信息技術研究所 | 酸化ガリウム半導体構造及びその調製方法 |
JP7321189B2 (ja) | 2018-11-15 | 2023-08-04 | 中国科学院上海微系統与信息技術研究所 | 酸化ガリウム半導体構造及びその調製方法 |
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US20030040163A1 (en) | 2003-02-27 |
KR20010101881A (ko) | 2001-11-15 |
US6566233B2 (en) | 2003-05-20 |
KR100796249B1 (ko) | 2008-01-21 |
EP1187216B1 (en) | 2018-04-04 |
EP1187216A1 (en) | 2002-03-13 |
TW511141B (en) | 2002-11-21 |
EP1187216A4 (en) | 2008-09-24 |
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