WO2002086975A1 - Production method for bonded substrates - Google Patents
Production method for bonded substrates Download PDFInfo
- Publication number
- WO2002086975A1 WO2002086975A1 PCT/JP2002/003522 JP0203522W WO02086975A1 WO 2002086975 A1 WO2002086975 A1 WO 2002086975A1 JP 0203522 W JP0203522 W JP 0203522W WO 02086975 A1 WO02086975 A1 WO 02086975A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- substrate
- bonding
- bonded
- substrates
- drying
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
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Classifications
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P90/00—Preparation of wafers not covered by a single main group of this subclass, e.g. wafer reinforcement
- H10P90/19—Preparing inhomogeneous wafers
- H10P90/1904—Preparing vertically inhomogeneous wafers
- H10P90/1906—Preparing SOI wafers
- H10P90/1914—Preparing SOI wafers using bonding
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P95/00—Generic processes or apparatus for manufacture or treatments not covered by the other groups of this subclass
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P90/00—Preparation of wafers not covered by a single main group of this subclass, e.g. wafer reinforcement
- H10P90/19—Preparing inhomogeneous wafers
- H10P90/1904—Preparing vertically inhomogeneous wafers
- H10P90/1906—Preparing SOI wafers
- H10P90/1914—Preparing SOI wafers using bonding
- H10P90/1916—Preparing SOI wafers using bonding with separation or delamination along an ion implanted layer, e.g. Smart-cut
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
- H10W10/00—Isolation regions in semiconductor bodies between components of integrated devices
- H10W10/10—Isolation regions comprising dielectric materials
- H10W10/181—Semiconductor-on-insulator [SOI] isolation regions, e.g. buried oxide regions of SOI wafers
Definitions
- the present invention relates to a washing step and a drying step before a substrate as a material is bonded in the production of a bonded substrate.
- bonded substrates In the production of bonded substrates, substrates of single or multiple types of materials are washed and dried, and then the material substrates are joined. Thereafter, a heat treatment is performed to increase the bonding strength at the bonding interface of the bonded substrates, and the substrates are firmly bonded. Then, one of the substrates is thinned to produce a bonded substrate.
- the drying process that follows the material substrate cleaning process involves placing the substrate in the heated vapor of IPA (isopropyl alcohol), which is a type of highly volatile organic solvent, and condensing the substrate with IPA.
- This method is performed by a water displacement method, which is a method of drying the substrate by elevating the temperature to the vapor temperature while replacing the moisture adhering to the surface (hereinafter referred to as IPA vapor drying method).
- IPA isopropyl alcohol
- FIG. 2 is a schematic view of a vertical section of an SOI II wafer as an example of a bonded substrate having these defects.
- a water replacement method such as the above-mentioned IPA vapor drying method is used in a drying step performed after a material substrate cleaning step.
- a bonded substrate is manufactured using a substrate dried by the water displacement method, the above-described void defect and prester failure are likely to occur, and the productivity and yield of the bonded substrate have been reduced.
- the invention according to the method for manufacturing a bonded substrate of the present invention includes a step of bonding at least two substrates, and a step of applying heat treatment to the bonded substrates to make the bonded substrates stronger.
- a method for manufacturing a bonded substrate having a bonding step at least a cleaning step for removing contaminants on the substrate surface is performed before bonding the substrate, and a step of drying the cleaned substrate surface
- the method is characterized in that the water displacement method is not used in the drying step, and that the bonding strength after bonding the substrates is increased by leaving water on the substrates before bonding. It is a sign.
- the drying step can be a step of suctioning and removing the water on the cleaned substrate surface.
- the material substrate is placed almost vertically on the drying pedestal on which the vacuum suction line is installed, and moisture is removed from the bottom of the substrate to remove water on the surface of the material substrate.
- the cleaning step is a step of performing a final rinse with hot water
- the next drying step can be a step of evaporating and removing the hot water on the cleaned substrate surface.
- the substrate used as a material of the bonded substrate is a silicon substrate, and that the silicon substrate with an oxide film is used. It is preferable that hydrogen, a rare gas, a hydrogen gas, and a logen gas are further injected.
- the substrate used as the material for the bonded substrate is a combination of a plurality of types of substrates depending on the type and use of the substrate. Among them, a silicon substrate and a silicon substrate with an oxide film are used. If a bonded substrate is manufactured using a silicon substrate or a silicon substrate into which hydrogen, a rare gas, or a halogen gas has been injected and the cleaning and drying processes of the present invention are applied, strong bonding strength and strong bonding can be obtained. The strength can be obtained, and a bonded substrate free from contamination and defects can be provided.
- the material substrate produced by the above-mentioned production method free of particles and organic contamination, is strongly bonded by moisture, and the bonding interface strength is increased by bonding heat treatment.
- a bonded substrate free of lead defects and prester defects is provided.
- the present invention in a drying step after a cleaning step before bonding, water is left on a material substrate before bonding by using a drying method without using a water displacement method.
- the joining strength at the joining interface after joining can be significantly increased.
- the material substrate is not charged by static electricity, contamination by particles of 0.2 ⁇ m or more in size is reduced. Furthermore, since no organic solvent is used, organic contamination is reduced.
- FIG. 1 is a process chart showing one embodiment of the production of a bonded substrate according to the present invention.
- FIG. 3 is an explanatory diagram showing a bonding state of a bonding interface of the bonding substrate when the material substrates are bonded at 200 ° C. or lower.
- FIG. 4 is an explanatory diagram showing the bonding state of the bonding interface of the bonding substrate after the material substrates are bonded and subjected to a heat treatment at 200 to 700 ° C.
- FIG. 5 is a diagram comparing the amount of SiOOH groups on the material substrate after drying the substrate by the drying method using the TOF-SIMSS method.
- FIG. 6 is a diagram comparing the amounts of OH on the material substrate after the substrate is dried using the TOF-SIMSS method.
- FIG. 7 is a diagram comparing the moisture on the material substrate after drying the substrate by the ATR-IR method using the drying method.
- FIG. 8 is an explanatory diagram showing the suction drying method.
- FIG. 9 is an explanatory diagram showing the spin drying method.
- the bonding strength obtained in the bonding step of the bonded substrates is, for example, small when peeling is performed in a hydrogen implantation separation method (sometimes called an ion implantation separation method or a smart cut method).
- the peeling strength of the bubble layer (which may be an ion-implanted layer or a high-concentration hydrogen layer) is weaker.
- the drying process performed after the material substrate cleaning process was performed.
- the water exchange method such as the IPA vapor drying method tends to be weaker.We searched for drying methods and drying conditions that could avoid this phenomenon, and scrutinized various conditions. The invention has been completed.
- the water bonding method such as the IPA vapor drying method is not used for the drying method in the drying step performed after the cleaning step of cleaning the material substrate, and hydrogen bonding is performed on the substrate surface before bonding.
- the residual moisture can prevent the material substrate from being charged by static electricity, adhesion of particles having a size of 0.2 / xm or more on the surface of the material substrate can be reduced. Can be.
- the present drying method that does not use the water displacement method does not use an organic solvent such as IPA, it does not cause organic contamination on the surface of the material substrate after drying.
- the use of the present invention significantly improves the bonding strength at the bonding interface of the bonding substrate. Therefore, the bonding strength of the bonded substrate after the bonding heat treatment is enhanced, and the product yield can be improved.
- a suction drying method is an example of a drying method that leaves moisture on the substrate surface without using the water displacement method of the present invention.
- a so-called spin dryer can be used.
- the spin dryer 25 shown in FIG. 9 has a support 27 that rotates at a high speed by a motor 26, so that the material substrate W is placed on the support 27 and moisture on the material substrate W is removed.
- the centrifugal force generated by rotating the substrate W at high speed in a horizontal state is used to remove moisture on the material substrate. Also in this case, the amount of moisture left on the surface of the material substrate can be made moderate.
- the rinse liquid in the final rinse tank in the cleaning step is used as hot water, and the substrate is slowly pulled up from the final rinse tank, thereby evaporating the warm water on the material substrate and evaporating the material substrate.
- a hot water pull-drying method a method of removing water
- IR (infrared) irradiation may be performed on the material substrate.
- multiple substrates can be processed simultaneously, resulting in high productivity.
- the amount of moisture remaining on the surface of the dried substrate can be made an appropriate amount.
- the drying step may be repeated a plurality of times.
- the present invention relates to an SOI (Siliconon Insulator) substrate, an SOQ (Si1 iconon Quartz) substrate, a dielectric isolation substrate, a substrate in which silicon wafers are joined without passing through an oxide film, and other bonding methods. It can be applied to any bonded substrates that can be manufactured. In addition, any method including a cleaning step, a drying step, and a bonding step can be applied without being limited to any other manufacturing method of a bonded substrate.
- SOI Siliconon Insulator
- SOQ Si1 iconon Quartz
- the material substrate is separated from the high-concentration hydrogen layer formed in the material substrate.
- An ion implantation method is used to form the high-concentration hydrogen layer.
- the bonding strength at the bonding interface when the bonded material substrate is peeled off is weak, and void defects at the bonding interface may occur.
- prester failure is likely to occur.
- the amount of water and OH groups responsible for hydrogen bonding at the bonding interface is significantly increased as compared with the water replacement method.
- the bonding strength at the bonding interface is improved, voids and blister defects are significantly reduced, and bonding interface quality and production yield are improved.
- the bonding strength at the bonding interface of the bonding substrate is improved, and at the same time, particles are removed from the material substrate. Since organic matter contamination is reduced, the bonding strength is increased by the bonding heat treatment, and void defects and pre- High quality bonded substrates without defects can be obtained with high productivity and high yield.
- FIG. 1 is a process diagram showing an outline of one embodiment of a method for manufacturing a bonded substrate according to the present invention.
- a hydrogen injection peeling method which is a type of manufacturing method of a bonded substrate.
- two bay wafers are prepared as material substrates (A :).
- substrates such as mirror-polished wafers, epitaxial wafers, heat-treated substrates, and the like, and the present invention can be applied to the present invention regardless of the type.
- a bare wafer is used as it is.
- the bond 1 may be used as the wafer
- the base 2 may be used as the wafer with an oxide film. Further, both may be a bare wafer or an oxide film-coated wafer.
- a cleaning step is performed before joining the material substrate (B).
- cleaning such as RCA cleaning is performed, and in the subsequent drying process (C), a method of leaving moisture on the wafer surface is adopted instead of the water replacement method, and the material is placed on the material substrate before bonding. Dry to leave moisture and ⁇ H groups.
- the bonding step (D) the surface of the bond wafer 1 and the surface of the base wafer 2 having water remaining on the surface are bonded.
- particle contamination and contamination from the atmosphere in the bonding process and the container storing the material substrate Since it is susceptible to organic contamination, it is desirable to perform the bonding step as soon as possible after the cleaning step and the drying step.
- the bonding heat treatment step (F) a bonding heat treatment of 100 ° C. or more is performed in an oxidizing atmosphere or a non-oxidizing atmosphere to increase the bonding strength at the bonding interface, and the bonding is firmly performed and stabilized.
- polishing step (G) polishing is performed to remove damage on the surface of the SOI layer and to improve micro roughness.
- a heat treatment such as hydrogen annealing can be performed.
- the SOI wafer 15 is completed by the hydrogen implantation delamination method.
- Fig. 3 is a schematic diagram illustrating the bonding state at the bonding interface of a bonded substrate bonded at a temperature of 200 ° C or lower. (Reference: Takao Abe, Silicon Crystal Growth and Ea Processing, Baifukan, 1 994, p. 330). From Fig. 3, it can be seen that the bonding state at the bonding interface is a hydrogen bond mainly composed of water and OH groups. Therefore, when moisture and OH groups are moderately large at the bonding interface, the bonding strength at the bonding interface is improved.
- Fig. 4 is a schematic diagram illustrating the bonding state of the bonding interface of the bonding substrate after low-temperature heat treatment at 200 to 700 ° C after bonding (Reference: Takao Abe, Silicon crystal growth and wafer processing, Baifukan, 1994, p. 330).
- the bonding state at the bonding interface is a bonding mainly composed of silanol groups.
- the bonding at the bonding interface gradually changes from hydrogen bonding to bonding by silanol groups. Therefore, the actual bonding at the bonding interface is a state in which hydrogen bonds and silanol group bonds are mixed. Therefore, the bonding strength after heat treatment improves as the amount of moisture and OH groups at the bonding interface during bonding increases.
- the bonding state of the bonding interface is a state in which the bonding by the silanol group and the hydrogen bonding are mixed. Therefore, the presence of a moderate amount of moisture and OH groups on the material substrate during bonding can improve the bonding strength at the bonding interface and reduce voids and pre-star defects .
- the amount of hydrogen implanted into the material substrate is set to 1 ⁇ 10 17 ions / cm 2 or more, the fine defect layer generated in the material substrate can be formed even at 400 ° C. or less. Therefore, the larger the amount of injected hydrogen, the lower the heat treatment temperature for exfoliation can be, and the bonding at the bonding interface becomes more dominated by hydrogen bonding. Therefore, the bonding strength at the bonding interface is weak, and void defects and blister defects are likely to occur. Therefore, during bonding, a moderate amount of water and OH groups are present on the material substrate, and the bonding strength at the bonding interface is improved, thereby reducing void defects and pre-star defects even at low temperatures. It can be done. The same applies to the case of using a technique of exfoliating at room temperature by exciting hydrogen and injecting it in a plasma state.
- the amount of water on the material substrate after the washing step and the drying step before bonding were compared between the suction drying method without using the water replacement method and the IPA vapor drying method using the water replacement method.
- FIG. 5 shows the amount of SiOH fragments detected from the substrate surface.
- the water displacement method is less effective than the IPA steam drying method using the water displacement method. It was found that the suction drying method had more SiOH groups, which played a role in bonding at the bonding interface.
- an SOI substrate was manufactured by using a hydrogen implantation delamination method, which is a kind of manufacturing method of a bonded substrate.
- the manufacturing process is based on the process diagram shown in FIG. First, a 1 5 0 nm oxide film with a diameter of 8 Lee ntchisi district Li co down substrate in Bonn were injected 8 XI 0 ie hydrogen ions ions / cm 2 Dueha was prepared as a base Ichisu wafers Beashiri co emissions substrate .
- An SOI wafer was manufactured by the hydrogen implantation delamination method using the same process as in the example except that the IPA vapor drying method, which is a water displacement method, was used in the drying step after the cleaning step before joining, and used as a comparative example. .
- non-defective rate after the peeling process was examined, only 7 non-defective pieces were obtained for the input number of 16 sheets in the sample dried by IPA in the comparative example (non-defective rate: 44% In this way, after the IPA vapor drying, the substrate was wetted again and the suction drying method was performed, and it was possible to obtain 12 non-defective products for 16 input sheets. (Good product rate: 75%).
- the suction drying method was performed only by re-wetting the substrate dried by the IPA vapor drying method with pure water again, but using Megasonic or a brush together, or using a chemical solution By doing so, in addition to improving the bonding strength, it is possible to reduce particles and organic contamination.
- a suction drying method, a spin drying method, a hot water pulling drying method, or the like which is the main drying method, can also be used.
- the present invention is not limited to the above embodiment.
- the above-described embodiment is an exemplification, and has substantially the same configuration as the technical idea described in the claims of the present invention. However, they are also included in the technical scope of the present invention.
- the present invention in addition to a semiconductor substrate as a material substrate, the present invention can be applied to an insulating substrate such as a quartz substrate or a metal substrate.
- device It can also be applied to substrates with loops.
- the peeling step in the hydrogen implantation peeling method is performed by heat treatment, but energy (electricity, plasma, high frequency, or the like) corresponding to the heat treatment may be applied.
- a micro-defect layer is formed in the hydrogen-rich layer, and a fluid (gas, liquid) is injected from the side of the substrate into the micro-defect layer to generate a bond. You may peel off.
- the method for manufacturing a bonded substrate is not limited to the above hydrogen implantation separation method. After bonding two substrates, one of the substrates is subjected to etching, grinding, polishing, or gas phase etching. Needless to say, the present invention can be applied to a method of making the film thinner and flatter.
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- Cleaning Or Drying Semiconductors (AREA)
- Cleaning By Liquid Or Steam (AREA)
Description
Claims
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US10/311,438 US6959854B2 (en) | 2001-04-18 | 2002-04-09 | Production method for bonded substrates |
| EP02714551A EP1381086A4 (en) | 2001-04-18 | 2002-04-09 | PREPARATION FOR BONDED SUBSTRATES |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001119457A JP4628580B2 (ja) | 2001-04-18 | 2001-04-18 | 貼り合せ基板の製造方法 |
| JP2001-119457 | 2001-04-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2002086975A1 true WO2002086975A1 (en) | 2002-10-31 |
Family
ID=18969673
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2002/003522 Ceased WO2002086975A1 (en) | 2001-04-18 | 2002-04-09 | Production method for bonded substrates |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US6959854B2 (ja) |
| EP (1) | EP1381086A4 (ja) |
| JP (1) | JP4628580B2 (ja) |
| KR (2) | KR20030008163A (ja) |
| CN (1) | CN1271721C (ja) |
| WO (1) | WO2002086975A1 (ja) |
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| JP2003535807A (ja) * | 2000-06-20 | 2003-12-02 | ショット、グラス、テクノロジーズ、インコーポレイテッド | ガラスセラミック複合材 |
-
2001
- 2001-04-18 JP JP2001119457A patent/JP4628580B2/ja not_active Expired - Lifetime
-
2002
- 2002-04-09 KR KR1020027017000A patent/KR20030008163A/ko not_active Ceased
- 2002-04-09 WO PCT/JP2002/003522 patent/WO2002086975A1/ja not_active Ceased
- 2002-04-09 US US10/311,438 patent/US6959854B2/en not_active Expired - Lifetime
- 2002-04-09 KR KR1020097009265A patent/KR20090064476A/ko not_active Ceased
- 2002-04-09 EP EP02714551A patent/EP1381086A4/en not_active Withdrawn
- 2002-04-09 CN CNB028012755A patent/CN1271721C/zh not_active Expired - Lifetime
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0397215A (ja) * | 1989-09-11 | 1991-04-23 | Toshiba Corp | 半導体ウェハの製造方法 |
| US5804494A (en) * | 1993-08-20 | 1998-09-08 | Shin-Etsu Handotai Co., Ltd. | Method of fabricating bonded wafer |
| JPH09186127A (ja) * | 1995-12-28 | 1997-07-15 | Shiii & I:Kk | 半導体ウェハーの洗浄・乾燥方法および装置 |
| EP0823607A2 (en) * | 1996-08-06 | 1998-02-11 | Shin-Etsu Handotai Company Limited | Method and apparatus for drying flat objects |
| EP0971396A1 (en) * | 1998-07-10 | 2000-01-12 | Shin-Etsu Handotai Company Limited | Method for manufacturing bonded wafer and bonded wafer |
Non-Patent Citations (2)
| Title |
|---|
| MITANI KIYOSHI ET AL.: "Causes and prevention of temperature-dependent bubbles in silicon wafer bonding", JPN. J. APPL. PHYS., vol. 30, no. 4, April 1991 (1991-04-01), pages 615 - 622, XP002954153 * |
| See also references of EP1381086A4 * |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2002313689A (ja) | 2002-10-25 |
| US20040035525A1 (en) | 2004-02-26 |
| CN1461496A (zh) | 2003-12-10 |
| CN1271721C (zh) | 2006-08-23 |
| KR20030008163A (ko) | 2003-01-24 |
| KR20090064476A (ko) | 2009-06-18 |
| EP1381086A1 (en) | 2004-01-14 |
| US6959854B2 (en) | 2005-11-01 |
| JP4628580B2 (ja) | 2011-02-09 |
| EP1381086A4 (en) | 2009-12-16 |
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