WO2003098695A1 - Substrat stratifie, procede de fabrication de substrat, et gabarit de pressage de peripherie externe de plaquettes utilises dans ce procede - Google Patents
Substrat stratifie, procede de fabrication de substrat, et gabarit de pressage de peripherie externe de plaquettes utilises dans ce procede Download PDFInfo
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- WO2003098695A1 WO2003098695A1 PCT/JP2003/005652 JP0305652W WO03098695A1 WO 2003098695 A1 WO2003098695 A1 WO 2003098695A1 JP 0305652 W JP0305652 W JP 0305652W WO 03098695 A1 WO03098695 A1 WO 03098695A1
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- active layer
- wafer
- outer peripheral
- polishing
- bonding
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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
- H01L21/02—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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B37/00—Lapping machines or devices; Accessories
- B24B37/27—Work carriers
- B24B37/30—Work carriers for single side lapping of plane surfaces
-
- 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
Definitions
- the present invention relates to a bonded substrate and a method for manufacturing the same, and a method for using the outer peripheral pressing jigs used therein. More specifically, for example, the removal of defective bonding at the outer peripheral portion of the active layer is performed by polishing after surface grinding.
- the present invention relates to a technology for manufacturing a bonded substrate. Background art
- a bonded SOI (Silicon Insul a tor) substrate As a kind of bonded substrate in which two silicon wafers are bonded, a bonded SOI (Silicon Insul a tor) substrate is known. This is because a buried oxide film (silicon oxide film) with a thickness of several m is placed between the SOI layer (active layer) on which devices are formed on the surface and the supporting substrate layer 18 that supports it from the back side. It is an embedded bonded SOI substrate.
- a bonded SII substrate manufacturing method in the outer peripheral grinding for grinding the outer peripheral portion of the active layer wafer, the outer peripheral portion of the wafer is not completely removed but a small amount is left.
- a method is known in which the uncut portion is removed with an alkaline etchant, and then the outer peripherally ground wafer for the active layer is sequentially subjected to surface grinding and surface polishing.
- a conventional manufacturing process of a bonded S0I substrate will be sequentially described with reference to FIGS. 23 to 27.
- the single crystal silicon ingot pulled up by the CZ method was slid.
- two silicon wafers (CZ wafers) 101 and 102 are prepared by polishing, polishing, and mirror finishing (Fig. 23 (a)).
- the silicon oxide film 101a having an insulating property is formed on the entire exposed surface of the active layer wafer 101 by thermal oxidation using a thermal oxidation furnace.
- the wafer for active layer 101 and the wafer for support substrate 102 are superposed at room temperature to produce a bonded wafer 103.
- a buried silicon oxide film 101b appears between the two wafers 101 and 102.
- the bonding wafer 103 is subjected to a bonding heat treatment at 800 ° C. or higher in an oxidizing atmosphere (FIG. 23 (b)).
- a silicon oxide film 103a is formed on the entire exposed surface of the bonding wafer 103.
- the active layer wafer 101 is previously covered with the silicon oxide film 101a. Therefore, the oxide film is further grown and thickened by the heat of the bonding heat treatment.
- the silicon oxide films 101a and 103a are shown in different colors in FIG. 23 (similarly in FIG. 1).
- the outer peripheral portion of the active layer wafer 101 is ground in order to remove the bonding failure area due to the outer peripheral shape of the chamfered wafers 101 and 102 ( Figure 23 (c)). If there is a defective bonding area, the defective part will be peeled and scattered in the subsequent washing and polishing steps, and will adhere to it, contaminating the surface of the SOI layer (active layer) or scattering. Depending on the material, the surface of the SOI layer may be damaged during wafer processing in a later process. This peripheral grinding is stopped to the extent that it does not reach the bonding interface. As a result, a small amount of uncut portion 101c appears on the outer peripheral portion of the active layer wafer 101.
- the uncut portion 101c is removed by alkali etching (Fig. 23 (d)).
- the outer peripheral portion of the bonded layer 103 comes into contact with an alkaline etching solution such as K 0 H, and the uncut portion 101 c Is melted.
- the outer peripheral portion of the surface on the bonding side of the support substrate wafer 102 is exposed.
- this exposed portion is referred to as a terrace portion.
- the bonding wafer 103 is loaded into a wafer loading groove of a wafer port (not shown), and then the wafer port is placed in a thermal oxidation furnace. It was inserted and heat treated. At this time, the outer peripheral end face of the wafer 102 for the support substrate comes into contact with the inner wall of the wafer filling groove of the port 18, so that the outer peripheral end face of the wafer 102 for the support substrate is damaged. Insufficient growth of the oxide film may occur. In the state where these problems have occurred, when the uncut portion 101c is etched around the periphery, the scratches and the insufficient growth of the oxide film are selectively etched as compared with other portions, and the etch peak shown in FIG. 24 is obtained. G appeared on the outer peripheral end surface of the wafer 102 for the support substrate.
- the silicon oxide films 101a and 103a are hardly etched by the above-described force re-etching. Therefore, after the surface grinding and polishing of the wafer 101 for the active layer, the beard-shaped silicon oxide films 101 a and 103 a are shaved on the terrace of the substrate 102 for the supporting substrate. The remaining part c is left (Fig. 26), which is peeled off and scattered, adheres to the surface of the S0I layer 101A and contaminates it, and is adhered to by post-process e-wafer processing. Sometimes, the surface of the SOI layer 101A could be damaged.
- the outer peripheral surface of the SOI layer 101A is a multiple of 90 degrees (90 degrees, 180 degrees, 2 degrees) in the circumferential direction with respect to the orientation flat (hereinafter, orientation flat) or notch. Other than around 70 °), the crystal orientation is not uniform. For example, according to an SOI layer having a (100) plane on which a device is formed, a portion that is a multiple of 90 degrees with respect to the orientation flat or notch has a crystal orientation of [011], but other portions have a crystal orientation of [0111]. Are irregular.
- the outer peripheral portion of the uncut portion 101c is anisotropically etched with an alkaline etching solution such as KOH, the outer peripheral surface of the S0I layer 101A has a non-uniform crystal orientation.
- the indentation (saw toothed jagged) d shown in Fig. 27 occurred.
- the S0I layer can be formed to have a notch.
- the terrace was formed by peripheral grinding, but the notch was formed along the notch in one grinding. Peripheral grinding was difficult.
- an S ⁇ I layer having a shape with an orientation flat was adopted.
- the device formation area was smaller than that of the S ⁇ I layer having a notch.
- a laser mark may be imprinted on the orientation or notch portion of the supporting substrate wafer in order to recognize the wafer on the bonded wafer. That is, a mark such as a bar code, a number, a symbol, or a figure specified in advance is displayed on the terrace portion exposed to the outside.
- a soft laser mark with a groove depth of 0.1 to 5 am and a hard laser mark with a groove depth of 5 to 100 m are generally known. I have. In the device process, soft laser marks are used.
- Kaiuranairi alignment SOI structure as compared with other S 0 I structure such as SIM 0 X, is the problem of crystal defects S i _ S i ⁇ 2 interface and thin S i layer is perforated interest.
- the CZ wafer which is the material wafer, contains a lot of COP and BMD (Bulk Micro Defect), which degrade the device characteristics.
- Japanese Patent Application Laid-Open No. Hei 5-212116 is known. This is because the high-temperature heat treatment in a reducing atmosphere or an inert atmosphere is performed on the active layer wafer before bonding or the bonded S ⁇ I substrate after bonding. This is a technology to remove oxygen and improve the crystal quality.
- the inventors have found that, instead of the conventional outer peripheral grinding and outer peripheral etching of the active layer ⁇ A8, the bonding failure portion at the outer peripheral portion of the active layer ⁇ Aha is only performed by surface grinding and surface polishing.
- the inventor has found that the above-mentioned problems (1) to (6) can be solved by removing it, and completed the present invention.
- An object of the present invention is to provide a bonded substrate from which an active layer having a notch can be obtained and a method for manufacturing the same.
- An object of the present invention is to provide a wafer peripheral pressing jig that can perform peripheral removal polishing on the wafer using an existing polishing apparatus.
- the width of the laser marking portion for example, the orientation flat portion or the notch portion of the terrace portion of the support substrate layer 18 is increased, the active layer from the laser irradiation may be removed. It was found that this could suppress the generation of dust, which would solve the problem (7) described above. Completed the invention.
- the present invention provides a bonded substrate which is less likely to generate dust from the active layer even when a laser marking is applied to a part of the outer peripheral portion of the supporting substrate wafer, a method of manufacturing the same, and a wafer removal method used in the bonded substrate.
- the purpose is to provide a pressing jig.
- the inventors performed surface grinding on the wafer for the active layer, and also performed outer peripheral removal polishing on the active layer to remove the outer peripheral portion and leave the central portion, so that the active layer was activated at room temperature. After bonding the wafer for the layer and the wafer for the supporting substrate, it was found that the bonded wafer can be manufactured without peeling the peripheral portion of the wafer without performing the bonding strengthening heat treatment. did. In addition, if the heat treatment is performed in a reducing atmosphere or an inert atmosphere after polishing the central part of the active layer, no crystal defects are present on the surface of the active layer. ) Was found to be solved, and the present invention was completed.
- an object of the present invention is to provide a bonded substrate having no crystal defects on the surface of the active layer at low cost and a method for manufacturing the same. Disclosure of the invention
- an outer peripheral surface of the active layer is an outer peripheral edge of a surface of the active layer. From the outer peripheral edge of the bonding interface from which the bonding failure of the support substrate PA 8 has been removed, or from the outer peripheral edge of the surface of the active layer to the outer peripheral edge of the support substrate PA 8.
- the bonded substrate is an inclined surface.
- a bonded SOI substrate for example, a bonded SOI substrate may be used. Can be. Alternatively, a substrate in which the active layer and the support substrate layer 18 are directly bonded may be used. Examples of the active layer include an SOI layer of a bonded S 0 I substrate. In this case, the oxide film exists below the active layer, and the exposed surface of the outer peripheral edge of the oxide film also becomes a polished inclined surface. Further, as the wafer for the support substrate, for example, a silicon wafer can be cited.
- the term “the outer peripheral surface of the active layer is a slope polished from the surface of the active layer to the outer peripheral edge of the bonding interface from which the bonding failure portion of the support substrate PA 8 has been removed” means that the outer peripheral surface of the active layer Means that the polished surface has a wider skirt.
- a skirt spread is a straight section (tapered section) or an arc section.
- the arc-shaped cross section refers to a shape in which the center protrudes outward from both ends as viewed in cross section.
- the bonding interface of the bonding substrate obtained by removing the bonding failure portion of the supporting substrate layer from the outer peripheral edge of the surface of the active layer is compared with the bonding layer of the active layer. From the outer periphery of the surface of the active layer to the outer periphery of the wafer for supporting substrate to the outer periphery or the outer periphery of the wafer for supporting substrate, outer periphery removal polishing is performed to leave the central portion as the active layer.
- This makes it possible to omit the step of grinding the outer periphery of the wafer for the active layer and the step of etching the outer periphery of the active layer, which are conventionally required. As a result, the number of manufacturing steps of the bonded substrate is reduced, and accordingly, the manufacturing time of the bonded substrate is also reduced.
- the bonded substrate is a bonded S0I substrate
- the active layer is contaminated or flawed due to a beard-shaped unremoved portion of the silicon oxide film scattered from the outer peripheral portion of the active layer. Can be eliminated.
- the yield rate of bonded substrates is increased.
- the manufacturing cost of bonded substrates can be reduced.
- a bonded substrate on which an active layer having a notch is formed which has been difficult to produce by the conventional method, can be easily produced.
- the outer peripheral portion of the active layer is removed by polishing with a polishing cloth (periphery removal polishing) instead of alkali etching as in the related art, the outer peripheral surface of the active layer is determined based on the orientation flat or notch.
- a polishing cloth peripheral removal polishing
- the outer peripheral surface of the active layer can be formed smoothly over the entire periphery.
- the bonded substrate obtained in this manner has a slope polished from the outer peripheral edge of the surface of the active layer to the outer peripheral edge of the bonded interface from which the defective bonding portion of the support substrate is removed, or the outer surface of the active layer.
- a second invention is a bonded substrate having no crystal defects on the surface of the active layer.
- the crystal defect refers to, for example, a crystal defect generated during growing a single crystal silicon ingot, a crystal defect generated during formation of an oxide film, and during bonding heat treatment.
- Specific examples include COP (Crysta1OrigiNaintedPatartic1e), BMD, and OSF (OxiadatIonInducdeStStackingFault).
- the absence of crystal defects as used herein refers to a state in which only 10 Z cm 2 or less crystal defects having a diameter of 0.1 l ⁇ m or more exist on the surface of the active layer.
- a method for realizing a state in which no crystal defects exist on the surface of the active layer For example, a heat treatment after forming an active layer on the surface on the side of bonding of the support substrate AA8 can be employed.
- the second invention since there are no crystal defects on the surface of the active layer, it is possible to enhance the electrical characteristics and the like of the device formed on the surface of the active layer. This is a bonded substrate whose surface width is partially different in the circumferential direction.
- the width of the inclined surface is the length of the inclined surface in a direction orthogonal to a tangent to the outer peripheral edge of the active layer.
- the fact that the width of the inclined surface is partially different in the circumferential direction of the wafer means that there are a wide portion and a narrow portion of the inclined surface in the circumferential direction. Since the active layer is thin, most of the inclined surface is a portion (terrace portion) on the bonding surface side of the outer peripheral portion of the supporting substrate.
- the wide portion can be, for example, a marking region where laser marking is performed. Soft laser marking can be used as laser marking.
- the formation position and the formation range of the wide portion in the wafer circumferential direction are not limited.
- the orientation flat portion or the notch portion may be a wide portion.
- the width of the narrow part is 0.5 to 4 mm, preferably 0.5 to 1.5 mm. If it is less than 0.5 mm, there is a disadvantage that an unbonded portion remains. On the other hand, if it exceeds 4 mm, the device area becomes small, and the device yield becomes poor.
- the width of the wide part is 3-5 mm, preferably 3-4 mm. If it is less than 3 mm, there is an inconvenience that dust will contaminate the surface of the SOI layer. On the other hand, if it exceeds 5 mm, the device area becomes smaller and the device yield becomes worse.
- the outer periphery of the active layer is formed at a wide portion of the inclined surface, for example, at a notch or orientation flat. A part of the part is removed more than the other part, and a width of A large terrace appears. Even if, for example, laser marking is performed on a wide terrace, the effect of the irradiated laser is unlikely to reach the active layer. As a result, dust generation on the active layer during laser marking can be suppressed.
- a fourth invention is the bonded substrate, wherein a wide portion of the inclined surface is a notch portion or an orientation flat portion.
- the wide part of the slope may be a notch or an orientation flat.
- the bonded substrate is a bonded S ⁇ I substrate in which a buried oxide film is formed between the active layer and the wafer for a support substrate.
- the oxide film may cover either the active layer material or the support substrate material which is the base material of the active layer.
- both the active layer and the supporting substrate may be used.
- the method for forming the oxide film is not limited. For example, dry oxidation, wet oxidation, and the like can be employed. Further, an n + layer or a SiGe film may be formed on the bonding surface.
- a bonding step of bonding the active layer layer A and the support substrate layer a heat treatment step of increasing the bonding strength of the bonded wafer produced by the bonding.
- the present invention provides a method for manufacturing a bonded substrate, comprising: an outer circumference removing polishing step of removing a defective bonding portion at an outer peripheral portion and leaving a central portion.
- the bonding of the wafer for the active layer and the wafer for the supporting substrate is performed, for example, by laminating both wafers at room temperature and then performing a bonding heat treatment.
- Heating temperature for bonding heat treatment is 800 ° C or more, for example, 11 0 ° C.
- the time for the bonding heat treatment is, for example, 2 hours. Oxygen or the like is used as the atmospheric gas in the thermal oxidation furnace to be used.
- a surface grinding wheel is used.
- Surface grinding conditions are, for example, using a resin grinding wheel of # 360 to # 200, and grinding the surface until the remaining active layer thickness becomes 10 to 60 m.
- the thickness of the active layer is not limited.
- the thickness is 1 to 200 ⁇ m for a thick active layer, and 0.1 to 1.0 Oim for a thin active layer.
- the outer periphery removal polishing step includes, for example, surface polishing in which the polishing rate of the outer peripheral portion of the active layer is higher than that of the central portion, and the supply amount of the abrasive to the outer peripheral portion of the active layer is smaller than the supply amount to the central portion.
- Surface polishing to increase surface polishing to increase the polishing pressure at the outer periphery of the active layer higher than the polishing pressure at the center, and the material of the polishing cloth pressed against the outer periphery of the active layer is applied to the center of the active layer.
- the surface of the bonded head is attached to the polishing head of a polishing machine, and the abrasive is supplied while the abrasive is supplied. Polish by pressing against the polishing cloth stuck on.
- the polishing device is not limited.
- a single wafer type polishing apparatus or a batch type polishing apparatus may be used.
- a wax type single-side polishing apparatus or a waxless type apparatus may be used.
- the type of polishing cloth is not limited.
- a porous non-woven fabric type in which polyester felt is impregnated with polyurethane may be used.
- foamed A foamable urethane type obtained by slicing a urethane block is exemplified.
- ceramic glass may be used.
- the abrasive contains free abrasive grains (polishing abrasive grains). While the abrasive is being supplied, the reduced abrasive surface of the active layer wafer is pressed against the polishing surface of the rotating polishing cloth, and the abrasive action of the fine abrasive particles is released. The outer periphery of the ground surface is polished.
- the surface is directly ground on the side of the active layer of the bonded wafer, the thickness of the active layer is reduced, and then the outer circumference of the active layer is formed.
- removal polishing a defective bonding portion on the outer peripheral portion of the wafer is removed to form an active layer.
- an etch pit is generated on the outer peripheral surface of the supporting substrate layer 18 due to the outer peripheral etching of the active layer, and when the bonded substrate is a bonded SOI substrate, silicon is removed. It is possible to prevent the active layer from being contaminated or scratched due to the remaining portion of the oxide film having a whisker. As a result, the yield rate of bonded substrates is increased. As a result, the manufacturing cost of the bonded substrate can be reduced. Furthermore, a bonded substrate on which an active layer having a notch is formed can be easily manufactured.
- the outer periphery of the active layer is not polished with alkali but is polished As a result, indentation caused by anisotropic etching occurs in the outer peripheral surface of the active layer, even in a region other than a multiple of 90 degrees in the circumferential direction with respect to the orientation flat or notch in the circumferential direction. do not do. Therefore, the outer peripheral surface of the active layer can be formed smoothly over the entire circumference.
- a central polishing step for polishing a central portion of the active layer after the outer peripheral removal polishing, instead of the heat treatment after the bonding, A method for producing a bonded substrate, wherein heat treatment in an active atmosphere is performed to enhance the bonding strength of the bonded substrate A8 and to remove crystal defects from the surface of the active layer.
- the polishing amount of the central portion of the active layer in the central polishing step is, for example, 5 to 10 m, preferably 7. If it is less than 5 m, there is an inconvenience that surface grinding damage remains. On the other hand, if it exceeds 10 m, there is a disadvantage that the polishing time becomes longer.
- the atmosphere in the furnace during the heat treatment is a reducing or inert gas atmosphere.
- Reducing atmosphere for example, formed from a reducing gas such as H 2.
- the heat treatment temperature is 100 ° C. or more, preferably 115 ° C. to 125 ° C. If the temperature is lower than 100 ° C., there is a problem that the crystal defects do not shrink sufficiently. If the temperature exceeds 125 ° C., slip and metal contamination may occur in the active layer.
- the heat treatment time is, for example, 1 to 3 hours.
- the heat treatment is performed in a reducing atmosphere or an inert atmosphere to perform the bonding.
- Crystal defects can be removed from the surface of the active layer without performing heat treatment in the atmosphere.
- a bonding step of bonding a wafer for an active layer and a wafer for a supporting substrate is performed. After the bonding, the active layer is removed while leaving the bonding side portion on the supporting substrate wafer, and the active layer is formed on one surface of the supporting substrate wafer. And a polishing step of removing the outer periphery from the removal surface side of the active layer layer 18 to remove the outer periphery and leave the center portion. It is a manufacturing method.
- a light element is ion-implanted from one surface of an active layer wafer having an oxide film formed on the entire exposed surface, and a supporting substrate wafer is bonded to the ion implanted surface. After that, this is heat-treated to increase the bonding strength of the bonding wafer, and the bonding wafer is divided into two parts in the thickness direction from the part where the light element is ion-implanted, and the activation is performed.
- a method for forming an active layer integrated with AHA8 for support substrate by peeling off the bonding side of AHA8 for layer (Silicon Science published on June 28, 1996, Realize Inc.) Chapter 6, Section 3, 3.2 Smart Cut Technology, page 465).
- the ELTRAN method means that a porous layer is formed on one surface of the active layer wafer by anodization, and a single crystal film is epitaxially grown on the surface of the porous layer.
- a wafer for a supporting substrate having an oxide film formed on the entire exposed surface is bonded to the surface of the wafer for the active layer on the side of the single crystal film. Then, this is heat-treated to increase the bonding strength of the bonding layer 18, and then the active layer wafer is ground from the side opposite to the bonding side until the porous layer is exposed. Or from a porous layer with a water jet Peeled. Then, the exposed porous layer is selectively etched to form an active layer composed of a single-crystal film.
- a Si Ge layer is formed on one surface of the active layer wafer, and a single crystal film is formed on the surface of the Si Ge layer by vapor phase growth. Then, an oxide film is formed. Next, hydrogen ions are implanted from one side of the wafer to increase the strain in the SiGe layer. Then, a wafer for a support substrate on which an oxide film is formed is bonded to the entire surface of the exposed surface, and is blown with an inert gas such as N 2 gas to be separated at the strained portion of the SiGe layer. Subsequently, the exposed Si Ge is selectively etched.
- the wafer for the active layer is subjected to outer periphery removal polishing to remove a bonding failure portion on the outer periphery of the wafer, thereby forming an active layer.
- an etch pit is generated on the outer peripheral surface of the supporting substrate layer 18 due to the outer peripheral etching of the active layer, and when the bonded substrate is a bonded SOI substrate, silicon is removed. It is possible to prevent the active layer from being contaminated or scratched due to the remaining portion of the oxide film having a whisker. As a result, the yield rate of bonded substrates is increased. As a result, the manufacturing cost of the bonded substrate can be reduced.
- a ninth invention is a method of manufacturing a bonded substrate, wherein in the outer peripheral removal polishing step, a polishing rate at an outer peripheral portion of the active layer is higher than a polishing rate at a central portion thereof.
- polishing rates at the outer peripheral portion and the central portion of the active layer are not specifically limited. The point is that the polishing rate may be such that when the central portion of the active layer is polished to a target thickness (but may not be polished), the defective bonding at the outer peripheral portion of the active layer disappears by polishing.
- the polishing rate is, for example, about 5.0 to 10.0 m / min in the peripheral portion of the wafer and about 0 to 2.0 m / min in the central portion of the wafer.
- a tenth invention is a method for manufacturing a bonded substrate, wherein a polishing pressure at an outer peripheral portion of the active layer is larger than a polishing pressure at a central portion thereof.
- a polishing pressure that is such that the outer peripheral portion of the active layer disappears by polishing acts on the bonding wafer.
- the polishing pressure at the periphery of the wafer is about 100 to 2500 gZ cm2, and the polishing pressure at the center of the wafer is about 0 to 500 g / cm2.
- the eleventh invention is a method of manufacturing a bonded substrate, wherein the outer peripheral removal polishing step is performed using an outer peripheral pressing jig that protrudes and deforms the outer peripheral portion of the active layer from its central portion to the polishing surface side. Is the way.
- the outer peripheral pressurizing jig will be described later.
- the outer peripheral portion of the reduced active layer wafer 18 is placed on the polishing surface side (toward the polishing cloth) from the center portion thereof by using the wafer outer peripheral pressing jig. Since the outer periphery is removed and polished by protruding deformation, it is possible to remove the outer periphery, which is a feature of the present invention, with an existing polishing apparatus only by attaching a wafer outer peripheral pressing jig. Polishing can be performed.
- a twelfth aspect of the present invention after the outer peripheral removal polishing, only a part of the outer peripheral portion of the bonding layer 18 in the peripheral direction is polished again, and an outer peripheral portion removing polishing step of removing the active layer at that portion.
- the polishing amount of the portion to be polished is not limited. For example, it is 1 to 20 m.
- the pressing jig used for the outer peripheral portion removal polishing for example, an abrasion portion removing and pressing jig that protrudes and deforms only the portion to be removed of the outer peripheral portion of the bonding plate 18 toward the polishing surface side is employed. can do.
- the pressurizing jig for 18 parts will be described later. '
- a portion of the active layer is largely removed in a part of the outer peripheral portion of the wafer in a peripheral direction, for example, an orientation flat portion or a notch portion.
- a wide terrace portion is formed on the outer peripheral portion of the supporting substrate layer 18. Therefore, even when, for example, laser masking is performed on this wide terrace portion, the influence of the irradiated laser is unlikely to reach the active layer. As a result, dust generation on the active layer during laser marking can be suppressed.
- the outer peripheral portion removing and polishing step comprises projecting only a portion to be removed of the outer peripheral portion of the active layer to the polishing surface side. This is a method for manufacturing a substrate.
- a fourteenth invention is a wafer outer peripheral pressing jig interposed between a polishing head for holding a semiconductor wafer on a surface facing a polishing cloth and the semiconductor wafer, and the jig body And an annular ridge formed on the surface of the jig body on the holding side of the semiconductor wafer, which protrudes and deforms the outer periphery of the semiconductor wafer from the center toward the polishing surface. It is a pressing jig.
- the semiconductor wafer for example, a silicon wafer or a gallium arsenide wafer can be employed.
- the semiconductor wafer may be a single unit or a bonded substrate obtained by bonding two semiconductor wafers (including a bonded S 0 I substrate).
- the material of the outer peripheral pressure jig for example, hard resins such as Zyuracon (trade name of polyacetal), PEEK (polyetheretherketone), polycarbonate, metals such as SUS, or ceramics are used. can do.
- hard resins such as Zyuracon (trade name of polyacetal), PEEK (polyetheretherketone), polycarbonate, metals such as SUS, or ceramics are used. can do.
- the ridge can be formed integrally with the jig body. Alternatively, they may be provided separately.
- the shape of the wafer outer peripheral pressing jig is changed according to the external shape of the bonding (8).
- the size of the wafer outer peripheral pressing jig is also changed according to the size of the bonded wafer to be polished.
- the shape of the jig body is not limited.
- the shape may be a disc shape or a cylindrical shape.
- the external shape of the ridge portion is appropriately changed according to the shape, for example, a semiconductor wafer having a notch or a semiconductor wafer 18 having an orientation.
- the ridge portions may be formed continuously or intermittently.
- a central portion of the semiconductor wafer excluding the outer periphery is pressurized by an area of the jig body inside the ridge portion.
- the central portion may be pressurized using a flat surface on the wafer holding side of the polishing head. However, it is not always necessary to pressurize the center of the semiconductor wafer 18.
- the wafer outer peripheral pressing jig may have a ring-shaped jig main body.
- the size of the pressure surface is changed according to the size of the semiconductor wafer.
- vacuum suction or template holding can be adopted for holding the semiconductor wafer 8 on the wafer outer peripheral pressing jig.
- the tip surface of the ridge can be an inclined surface whose height gradually decreases toward the center of the jig body.
- the inclination angle of the inclined surface is 5652
- the inclined surface may not be a straight line in cross section, but may be a curved surface such as a chamfered shape of an A-eight.
- the outer peripheral portion of the semiconductor wafer 18 is deformed so as to protrude from the central portion thereof toward the polishing surface side by using the outer peripheral pressurizing jig and the outer peripheral portion is polished.
- the conventionally required outer periphery grinding step and active layer outer periphery etching step of the active layer for the active layer are omitted. be able to.
- the number of manufacturing steps of the bonded substrate is reduced, and accordingly, the manufacturing time of the bonded substrate is also reduced.
- the outer peripheral surface of the supporting substrate wafer is etched by the outer periphery of the active layer. It is possible to eliminate the occurrence of etch pits and the occurrence of contamination or scratches on the active layer due to the beard-shaped uncut portion of the silicon oxide film. This increases the yield rate of bonded substrates. As a result, the manufacturing cost of the bonded substrate can be reduced. Furthermore, a bonded substrate on which an active layer having a notch is formed can be easily manufactured.
- the outer peripheral surface of the active layer is 90 ° in the circumferential direction with respect to the orientation flat or the notch. Indentation due to anisotropic etching does not occur in regions other than multiples. Therefore, the outer peripheral surface of the active layer can be formed smoothly over the entire periphery.
- the active layer reduced in thickness by using the wafer peripheral pressing jig The outer peripheral portion of the tool is deformed so as to protrude from the center to the polishing surface side, and the outer peripheral portion is polished. Therefore, even with existing polishing equipment, the outer peripheral portion can be polished by attaching the outer peripheral pressing jig. Can be implemented.
- the notch formed on the ridge portion is formed by projecting a notch portion formed on an outer peripheral portion of the semiconductor gap from the center of the semiconductor gap to a polishing surface side.
- This is an A-8 outer circumference pressing jig in which a pressure portion is formed.
- the notch pressing portion is a projection portion provided on a part of the inner peripheral edge of the protrusion and pressed against the notch forming portion of the semiconductor wafer.
- the notch pressing portion has a shape similar to the notch shape of the semiconductor device 8, and is larger than the notch by 0.1 to 0.5 mm.
- the notch portion of the semiconductor wafer is deformed by the notch presser portion toward the polishing surface side from the center portion of the wafer. Therefore, outer peripheral removal polishing accompanied by polishing of the notch portion can be performed.
- the sixteenth invention is characterized in that, in the ridge portion, an orientation flat pressing portion for projecting and deforming an orientation flat portion formed on an outer peripheral portion of the semiconductor device 8 toward a polishing surface side from a central portion of the semiconductor device 8 is provided. This is the formed AA Hachi outer circumference pressing jig.
- the orientation flat pressing portion is a half-moon-shaped projection provided on a part of the inner peripheral edge of the protrusion and pressed against the orientation flat forming portion of the semiconductor wafer.
- the orifice pressurizing section has a shape similar to the orifice shape of the semiconductor wafer, and is smaller than the orifice by 0.1 to 0.5 mm.
- the orientation flat portion of the semiconductor wafer is projected and deformed toward the polishing surface side from the center of the wafer by the orifice pressing portion. Peripheral removal polishing accompanying polishing of the station flat part can be performed.
- a bonding head in which the active layer and the support substrate adhesive are bonded to each other comprises: a polishing head which holds the active layer side toward a polishing cloth; A jig part removing pressure jig interposed between the jig main body and the jig main body, the jig main body being bonded to the jig main body; This is a partly-partial pressing jig provided with a part protruding part that protrudes and deforms only a part to be removed from the outer peripheral part of the active layer toward the polishing surface.
- the material of the pressure-removal jig for removing the evaporator for example, hard resins such as Zyuracon, PEEK, polycarbonate, etc., metals such as SUS, or ceramics can be used.
- hard resins such as Zyuracon, PEEK, polycarbonate, etc.
- metals such as SUS, or ceramics
- the partial protrusion can be formed integrally with the jig body. Alternatively, they may be provided separately.
- the shape of the wafer part removal pressurizing jig is changed according to the external shape of the bonding machine A8.
- the size of the pressurizing jig for removing part of the wafer is also changed according to the size of the bonded wafer to be polished.
- the shape of the jig body is not limited.
- the shape may be a disc shape or a cylindrical shape.
- the external shape of the partial protruding portion is appropriately changed according to the shape of the portion to be removed from the outer peripheral portion of the bonding member A, for example, a half-moon shape sized to cover the notch portion or the orientation flat portion.
- the bonding machine not only the central part of the bonding machine A but also the outer peripheral part of the wafer except for the part to be removed is pressed by the area of the jig body inside the partial protrusion. .
- the center of the bonding head may be pressurized using a flat surface of the polishing head on the wafer holding side. ⁇ Attaching to the Eagle Part Removal Pressing Jig ⁇
- the holding of the wafer can be performed, for example, by vacuum suction or template holding.
- the tip surface of the partial protrusion gradually decreases in height toward the center of the jig body. It can be an inclined surface that becomes.
- the inclination angle of the inclined surface is appropriately changed in the range of 0.1 to 90 degrees according to the amount of polishing of the outer peripheral portion of the bonding layer 8. ⁇ Increase the inclination angle when increasing the polishing amount of the 18 outer peripheral portion.
- the inclined surface may not be a straight line in cross section, but may be a curved surface such as a chamfered shape of A-8.
- the outer periphery is polished beforehand. Only the portion to be removed of the outer periphery of the A-8 is deformed to the polishing surface side by the partially projecting portion of the evaporator jig. Then, only the protruding portion is pressed against the polishing cloth to remove and polish the outer peripheral portion.
- a portion of the outer peripheral portion of the active layer is largely removed at a portion in the circumferential direction of the outer peripheral portion, for example, an orientation flat portion or a notch portion, and a portion having a wide inclined surface appears. Therefore, even if laser marking is performed on a wide portion, the influence of the irradiated laser is unlikely to reach the active layer. As a result, dust generation from the active layer during laser marking can be suppressed.
- the eighteenth invention provides a method for removing and pressing a part of the jig main body and / or the partial projecting part, wherein at least a part of the jig body and / or the part which is in contact with the polishing pad is formed of a material which is less polished than other parts. It is a jig.
- the type of material that is difficult to polish is not limited.
- a hard resin such as Zyuracon, PEEK :, or Polycarbonate, or ceramic can be used.
- the portion that uses a material that is difficult to be polished may be only the jig body or only the partially projecting portion. Alternatively, both the jig body and the partially projecting portion may be used.
- the partial protrusion can be formed integrally with the jig body. Alternatively, they may be provided separately. According to the eighteenth aspect, even when the jig body and / or the-part of the partially projecting portion comes into contact with the polishing cloth during polishing, the contacting portion is formed of a material that is difficult to be polished.
- the main body and / or partial protrusions are Hard to be scratched. BRIEF DESCRIPTION OF THE FIGURES
- FIG. 1 is a flow sheet showing a method for manufacturing a bonded substrate according to a first embodiment of the present invention.
- FIG. 2 is a longitudinal sectional view showing a use state of an outer peripheral removal polishing step in the method for manufacturing a bonded substrate according to the first embodiment of the present invention.
- FIG. 3 is a perspective view showing a step of attaching the bonded wafer to a wafer outer peripheral pressing jig applied to the method for manufacturing a bonded substrate according to the first embodiment of the present invention.
- FIG. 4 is a cross-sectional view showing a usage state of a wafer outer peripheral pressing jig for a wafer 18 with an orientation flat according to another embodiment of the present invention.
- FIG. 5 is a perspective view showing a process of attaching a wafer to a wafer outer peripheral pressing jig according to another embodiment.
- FIG. 6 is a cross-sectional view showing a use state of a wafer outer peripheral pressing jig for a wafer with an orientation flat according to still another embodiment of the present invention.
- FIG. 7 is a perspective view showing a wafer mounting process to a wafer outer peripheral pressing jig according to yet another embodiment.
- FIG. 8 is a cross-sectional view showing a usage state of a wafer outer peripheral pressing jig for a notched wafer according to still another embodiment of the present invention.
- FIG. 9 is a perspective view showing a wafer mounting process to a wafer outer peripheral pressing jig according to yet another embodiment.
- FIG. 10 is a sectional view showing a use state of a wafer-eight-periphery pressing jig for a wafer with an orientation flat according to another embodiment of the present invention.
- FIG. 11 is a perspective view showing a wafer mounting process to a wafer outer peripheral pressing jig according to another embodiment.
- FIG. 12 is a cross-sectional view showing a use state of an A-8 outer circumference pressing jig for a notched AHA according to still another embodiment of the present invention.
- FIG. 13 is a perspective view showing a process of attaching the A-E8 to the E-aperture pressurizing jig according to another embodiment.
- FIG. 14 is a cross-sectional view showing a wafer peripheral pressing jig according to still another embodiment of the present invention.
- FIG. 15 is a cross-sectional view showing a relevant part of a wafer removal pressure jig applied to the method for manufacturing a bonded substrate according to the first embodiment of the present invention.
- FIG. 16 is a cross-sectional view showing a main part of another wafer-part removing pressure jig applied to the method for manufacturing a bonded substrate according to the first embodiment of the present invention.
- FIG. 17 is a perspective view of a wafer bonded to a wafer removing pressurizing jig for a wafer with an orientation flat applied to the method for manufacturing a bonded substrate according to the second embodiment of the present invention.
- FIG. 18 is a cross-sectional view showing a mounting process of Eighth Embodiment.
- FIG. 18 is a bottom view of a wafer-part removing pressurizing jig according to a second embodiment of the present invention.
- FIG. 19 is a plan view of a bonded AA 8 manufactured using a A8 partial removal pressurizing jig according to the second embodiment of the present invention.
- FIG. 20 is a cross-sectional view showing a process of attaching a wafer to a wafer-part removing pressure jig applied to a method of manufacturing a bonded substrate according to another embodiment of the present invention. It is.
- FIG. 21 is a plan view of a pressurizing jig for removing part A, which is applied to a method of manufacturing a bonded substrate according to another embodiment of the present invention.
- FIG. 22 is a plan view of a bonding wafer 18 manufactured by using a wafer-part removing pressure jig according to another embodiment of the present invention.
- FIG. 23 is a flowchart showing a method of manufacturing a bonded substrate according to a conventional method. It is a sheet.
- FIG. 24 is an enlarged front view of an etch pit generated on the outer peripheral end surface of the support substrate PA 8 according to the conventional means.
- FIG. 25 is an enlarged plan view of the etch pit generated on the terrace portion of the support substrate AA8 according to the conventional means.
- FIG. 26 is an enlarged front view of an uncut portion of the silicon oxide film generated on the outer peripheral portion of the supporting substrate PA 8 according to the conventional means.
- FIG. 27 is an enlarged plan view of the indent generated on a part of the outer peripheral surface of the active layer according to the conventional means.
- the single crystal silicon ingot was first pulled up by the CZ method, and then the obtained single crystal silicon ingot was cut into blocks, notched, sliced, chamfered, wrapped, etched, and mirrored. Polishing or the like is performed to prepare an active layer wafer 10 having a mirror-finished notch having a thickness of 725 m and a diameter of 200 mm.
- a wafer 20 for a supporting substrate having the same thickness and the same diameter as the mirror-finished notch is prepared (FIG. 1 (a)).
- the wafer 10 for the active layer and the wafer 20 for the support substrate do not have to have the same thickness.
- the active layer wafer 10 is introduced into a thermal oxidation furnace and subjected to thermal oxidation treatment, and the entire exposed surface is covered with an insulating silicon oxide film 10a. Further, only the wafer 20 for the supporting substrate may be oxidized, or both the wafers 180 and 20 may be oxidized. Then, the mirror surfaces of the two wafers 10 and 20 are superimposed at room temperature in a clean room (Fig. 1 (b)). Thereby, the bonded wafer 30 is formed. By this bonding, the portion of the silicon oxide film 10a interposed between the wafer 10 for the active layer and the wafer 20 for the support substrate becomes a buried silicon oxide film 10b.
- the bonding wafer 30 is inserted into a thermal oxidation furnace for bonding, and the bonding heat treatment is performed in an oxidizing atmosphere.
- the bonding temperature is 110 ° C. and the heat treatment time is 2 hours (also FIG. 1 (b)).
- the bonding heat treatment was not indispensable in forming the bonding layer A 30 because the surface of the active layer layer 180 was later ground and the SOI layer 1 was formed. This is because only outer periphery removal polishing is performed on 0 A. Because grinding and etching of the outer periphery are not performed, the bonding strength can be sufficiently maintained even at the bonding state at room temperature.
- the void is a void defect caused by a bonding failure between the bonding interface between the active layer wafer 10 and the supporting substrate wafer 20.
- the active layer wafer 10 is ground from the surface side thereof with a # 300 to # 200 00 resinoid grinding wheel (Fig. 1 (c )). At this time, the surface grinding amount is about 700 m, and the thickness of the active layer wafer 10 reduced by processing is about 20 m.
- the TTV of the bonded wafer 30 should be 1 / zm or less.
- the outer peripheral portion bonding defect generated at the time of bonding is applied to the ground surface of the reduced active layer wafer 10 at the time of bonding.
- the outer periphery is polished to remove the part and leave the central part to form the S ⁇ I layer 10A (Fig. 1 (d)).
- the wafer outer peripheral pressing jig 50 is formed integrally with the jig main body 51 and the lower surface side of the outer peripheral portion of the jig main body 51, and the wafer 10 for the active layer wafer 10 after surface grinding is formed.
- An annular ridge 51 a for deforming the outer peripheral portion so as to protrude toward the polishing surface from the central portion, and a double-sided tape 52 attached to the upper surface of the jig body 51 are provided.
- the jig body 51 is made of a hard resin such as PEEK and has a thick disk shape.
- One surface of a double-sided tape 52 is adhered to the upper surface of the jig body 51.
- the area inside the protruding ridge 51 a of the jig body 51 is a wafer pressurizing portion that presses the entire area of the central portion of the wafer 30 from behind.
- the size of this area that is, the size of the pressurized surface 51b of the bonding wafer 30 is such that the outer periphery of the wafer is 1.0 mm with respect to the bonding wafer 30 having a diameter of 200 mm.
- the outer circumference is polished with the notch part being about 3.0 mm, the diameter of the notch part is about 197 mm, and the other parts are about 199 mm.
- the bonding layer 180 is held on the pressing surface 51 by vacuum suction.
- the notch of the active layer wafer 10 and the active layer wafer 10 are formed on a part of the inner peripheral surface of the ridge 51 a through the notch of the support substrate 20.
- a notch pressing portion 51c is formed to protrude and deform from the central portion to the polishing surface side.
- the inner peripheral portion of the distal end surface of the ridge portion 51 a is a tapered surface 51 d whose height gradually decreases toward the center of the jig body 51.
- the inclination angle 0 of the taper surface 51 d is 30 °. However, the inclination angle is set as appropriate between 0.1 ° and 90 °.
- the wafer outer peripheral pressing jig 50 is attached to the lower surface of the polishing head 41 of the single-wafer polishing apparatus 40 by a double-sided tape 52. After that, the bonded wafer 30 after surface grinding is held via the wafer outer circumference pressing jig 50 with the active layer wafer 10 side facing downward.
- the polishing cloth 43 is a soft non-woven pad manufactured by Kuchidale Co., Ltd., Suba 600 (Asker hardness of 80 °).
- the rotation speed of the polishing head 41 is 60 rpm, and the rotation speed of the polishing platen 42 is 120 rpm.
- the polishing pressure at the center of the active layer wafer 10 against the polishing cloth 43 via the wafer outer peripheral pressing jig 50 is about 0 kgZ cm 2
- the polishing pressure of the part is about 500 kgZ cms.
- the polishing amount is about 0 m at the center of the active layer wafer 10, and about 20 zm at the outer periphery of the wafer, where the active layer wafer 10 disappears at this portion.
- the supply amount of the abrasive (colloidal silica) containing abrasive grains is 180 ml / min.
- the surface of the active layer 10 of the bonded wafer 30 that has been subjected to the bonding heat treatment is directly ground without the outer periphery grinding, and the active layer wafer 10 is reduced in thickness.
- the wafer 10 for the active layer is subjected to the outer peripheral removal polishing to remove the defective bonding at the outer peripheral portion generated at the time of bonding and leave the central portion as the SI layer 10A. Therefore, the outer periphery grinding and the outer periphery etching, which are conventionally required, can be omitted.
- the number of manufacturing steps for bonded SOI substrates is reduced, The manufacturing time of the SII substrate is also reduced.
- the thickness of the obtained SOI layer 1 OA is about 15 to 20/2111, and its thickness is also about 1 to 5 m.
- the outer peripheral surface of the wafer for the supporting substrate caused by the outer peripheral etching of the SOI layer which is a problem in wafer quality in the conventional technology, is considered.
- the yield of bonded S 0 I substrates is increased.
- the manufacturing cost of the bonded SOI substrate can be reduced. Furthermore, a bonded S 0 I substrate having a S 0 I layer having a notch, which has been difficult to manufacture by the conventional method, can be easily manufactured. Thereby, the device formation area of the SOI layer 10A can be increased as compared with the case of the S0I layer having the orientation flat.
- the outer peripheral portion of the SOI layer 10A is removed by mechanical polishing (periphery removal polishing) instead of alkali etching as in the past, the notch on the outer peripheral surface of the SOI layer 1OA is removed. Indentation caused by anisotropic etching does not occur even in a region other than a multiple of 90 degrees in the circumferential direction, that is, in a region where the crystal orientation is not uniform. Therefore, the outer peripheral surface of the SOI layer 1OA can be made smooth over its entire circumference.
- the bonded SOI substrate thus obtained has an outer peripheral surface of the S0I layer 10A from an outer peripheral edge of the surface of the S ⁇ I layer 10A.
- the support substrate wafer 20 has a tapered surface polished to the outer peripheral edge of the bonding interface from which the bonding failure portion has been removed.
- a notch is formed in a part of the outer peripheral portion of the SOI layer 10A.
- the silicon oxide film 30 a around the wafer 20 for the support substrate is formed. May be polished.
- the outer peripheral portion of the reduced active layer material 80 is projected from the central portion toward the polishing surface side to perform outer peripheral removal polishing. Therefore, by simply fixing the outer peripheral pressing jig 50 to the lower surface of the polishing head 41 of the existing polishing apparatus 40, the outer peripheral removal polishing characteristic of the first embodiment is performed. be able to.
- the bonded SOI substrate thus manufactured is then subjected to high-precision, low-damage surface grinding or high-precision polishing using a double-side polishing machine (not shown) to reduce the TTV of the SOI layer 1 OA to 1 m or less.
- Predetermined processing is performed until the layer thickness of 10 A becomes about 5 to 10 m.
- the thickness of the SOI layer 10A is finished to a final target value of 3 m by a single-wafer polishing apparatus (not shown).
- the bonding strength of the bonding wafer 30 is increased, and a heat treatment for removing crystal defects such as C0P, oxygen precipitates, and ⁇ SP from the surface of the SOI layer 10A (hereinafter referred to as “no Defect heat treatment). Specifically, heat treatment is performed at 1200 ° C. in an H 2 gas atmosphere for 1 hour. As described above, since the heat treatment is performed after the polishing of the central part of the SOI layer 10A, the surface of the SOI layer 10A can be actually a defect-free surface having no crystal defects. In addition, the bonding strength of the bonding wafer 30 is also enhanced.
- the obtained bonded SII substrate is washed, packed in an AA case, etc., and then shipped to a device manufacturer.
- the wafer outer peripheral pressing jig 50 A shown in FIGS. 4 and 5 has a configuration capable of removing and polishing the outer periphery of the bonded wafer 30 having the orientation flat. This is an example.
- a part of the tapered surface 51 d of the ridge portion 51 a is provided with an orifice portion of the active layer wafer 10 through a support substrate wafer 20, and an active layer wafer 10 of the active layer wafer 10.
- An orientation flat pressurizing portion 51 e that protrudes and deforms from the center toward the polishing surface is protruded toward the center of the pressurizing surface 51 b.
- Other configurations, operations, and effects are substantially the same as those of the outer peripheral pressing jig 50 of the first embodiment.
- the wafer outer peripheral pressing jig 50B shown in FIGS. 6 and 7 has an orientation flat pressing portion 51e formed on a part of the taper surface 51d, and has a bonding wafer having an orientation flat.
- a jig for removing the outer periphery of 30 and polishing, and furthermore, the tapered surface 51 d of the ridge 51 a is moved from the outer peripheral edge of the tip of the ridge 51 a to the base of the ridge 51 a. It has a wide taper surface that reaches the inner peripheral edge of the portion. ⁇ Other configurations, operations, and effects are substantially the same as those of the wafer outer peripheral pressing jig 50 of the first embodiment.
- the jig main body 51 is thickened, and the jig main body 51 is polished with a double-sided tape 52.
- an annular template 51 f is provided, which is adhered to 41 and is provided on the outer peripheral side of the ridge portion 51 a for accommodating and holding a notch-supporting base plate 180.
- the jig body 51, the ridge 51a and the template 51f are integrally formed of the same material.
- the bonding wafer 30 in the template 51 f is used. It is preferable to make the play amount of 0 as small as possible. By doing so, the removal width in the radial direction of the adhesive layer A can be made uniform over the entire outer peripheral portion of the bonded adhesive layer.
- the wafer outer peripheral pressing jig 50 D shown in FIG. 10 and FIG. 11 is a jig for a bonding wafer 30 having an orientation flat, and the template 51 f This is an example in which is provided.
- Other configurations, operations and effects are substantially the same as those of the wafer outer peripheral pressing jig 50.
- the outer peripheral pressing jig 50E shown in FIGS. 12 and 13 has a tapered surface 51d of the ridge 51a, and a tapered surface 51d of the ridge 51a.
- the wafer outer peripheral pressing jig 50 F shown in FIG. 14 fits the jig body 51 into an annular groove 41 a formed in the lower portion of the polishing head 41.
- the plate 51 f is also used.
- the template 51 f is of a type for holding and holding a support substrate wafer 20 having a notch, similarly to the wafer outer peripheral pressing jig 50 C.
- the ridge 51a and the template 51f are integrally formed of the same material.
- ⁇ indicates the inclination angle of the tapered surface 51 d of the ridge 51 a.
- the lower part of the polishing head 41 is a wafer pressurizing portion.
- the bonded wafer 30 is directly vacuum-adsorbed to the lower surface of the polishing head 41.
- FIGS. 15 and 16 show the inclination angle 0 of the tapered surface 51 d of the ridge 51 a in the wafer outer peripheral pressing jigs 50, 50 A to 50 E.
- FIG. 15 shows the taper surface 5Id of the same type as the wafer outer peripheral pressing jigs 50, 5OA, 50C, 50D, and the inclination angle 0 thereof.
- Figure 16 Indicates the inclination angle S of the tapered surface 51 d of the same type as the wafer outer peripheral pressing jigs 50 B and 50 E.
- the feature of the second embodiment is that after the outer periphery removal polishing in the first embodiment, only a part of the outer peripheral portion of the bonding portion 180 in the circumferential direction is polished again (second polishing), The point is that peripheral portion removal polishing for removing the active layer 10A in that portion is performed.
- the specific portion of the bonded wafer 30 to be polished is near the orientation flat.
- the width d of the terrace portion near the orientation flat of the support substrate 180 is increased, and a hard laser mark M is engraved there (FIG. 19).
- an aerial portion removal pressure jig 60 is used for the outer peripheral portion removal polishing.
- the wafer partial removal pressurizing jig 60 is bonded to the jig main body 61 and the jig main body 61.
- the jig main body 61 is integrally formed on the surface on the holding side of the wafer 30, and the outer peripheral portion of the active layer 10A is formed.
- a partial projecting portion 62 is provided for projecting and deforming only the portion to be removed toward the polishing surface.
- the jig body 61 is made of a hard resin such as PEEK and has a thick disk shape.
- One surface of a double-sided tape 52 is attached to the upper surface of the jig body 61.
- an annular ridge 61a is formed over the entire circumference.
- a portion of the outer periphery of the jig body 61 other than the vicinity of the orientation flat is fixed with an abrasion prevention frame 61 b made of ceramics having a substantially C shape.
- the orifice portion 6 la that guides the orifice portion of the bonded wafer 30 from the outside is formed in the orifice portion of the ridge portion 6 la by thickening this portion. Formed ing.
- a region inside the ridge portion 61 a is a pressurized portion that presses the entire area of the central portion of the bonded wafer 30 from behind.
- the size of this area, that is, the size of the pressurized surface 61 d of the bonding wafer 30, is as follows. It is a size that can be removed and polished.
- a partial protruding portion 62 for increasing the width d of the terrace portion of the wafer 20 for the supporting substrate to 4 mm is formed in the orientation flat portion of the pressing surface 61 d.
- the partial protrusion 62 is a flat ridge having a height of 0.2 mm formed adjacent to the orientation flag 61c.
- the orifice portion of the bonding wafer 30 is polished from the center of the active layer wafer 10 by the partially projecting portion 62. It protrudes to the surface side and slightly protrudes from the lower end surface of the ridge 61a.
- five spaced suction ports 61 e which communicate with the air supply section of the negative pressure generating device (not shown), are formed.
- the polishing head 41 is rotated at 60 rpm, and the polishing platen 42 is rotated at 60 rpm.
- the polishing pressure at the center of the active layer layer 10 against the polishing cloth 43 via the part 18 pressure removing jig 60 is about 0 kg Z cm2, and the active layer layer
- the polishing pressure at the orientation flat of 10 is about 500 kg / cm2.
- the polishing rate of the orientation flat portion is 5 to: L0 ⁇ m / min, and the polishing rate of the central portion of the wafer is 0 ⁇ mZ.
- the polishing amount is about 0 at the center of the active layer wafer 10, and at the outer periphery of the wafer, the active layer wafer 10 in the orientation flat part disappears by the width d (4 mm) 2 0 // m It is about.
- the supply amount of the abrasive (colloidal silica) containing the abrasive grains is 180 ml / min.
- the wafer-part removing pressure jig 60A shown in FIGS. 20 to 22 is an example in which a bonded wafer 30 having a notch is configured to be capable of removing and polishing an outer peripheral part. is there.
- the notch part of the ridge part 6 1a is thickened in a semicircular shape when viewed from the bottom, so that the notch part of the bonding face 180 is guided from the outside.
- Notch guide 61 f is formed.
- a notch portion of the pressing surface 61 d is formed with a partial protrusion 62 A that enlarges the width d 1 of the terrace portion of the support substrate wafer 20 to 4 mm.
- the partial protrusion 62A is a flat ridge having a height of 0.2 mm formed adjacent to the notch guide 61f.
- Other configurations, operations, and effects are substantially the same as those of the wafer outer peripheral pressing jig 50 of the first embodiment.
- the bonding inside the wafer outer peripheral pressing jig or the inside of the wafer removing and pressing jig is performed in order to reduce the play amount of the wafer.
- the wafer may be clamped in the wafer outer peripheral pressing jig.
- the active layer layer 8 and the support substrate layer 18 are bonded together, and then the active layer layer is reduced by surface grinding or the like to form an active layer.
- the combined S 0 I substrate has been described as an example.
- the present invention is not limited to this, and may be applied to, for example, a bonded substrate manufactured by a smart cut method. Or, it can be applied to bonded substrates manufactured by ELTRAN method or SiGen method. can do.
- the bonded substrate is manufactured by the smart cut method, the ELTRAN method, or the SiGen method
- the active layer layer A and the supporting substrate layer are bonded, a portion on the bonded side is formed.
- the wafer for the active layer is removed while leaving the layer for the supporting substrate, and the active layer is formed on one side of the supporting substrate.
- the active layer is polished from the removal surface side of the active layer layer 18 to remove the outer peripheral portion and leave the central portion (outer peripheral removal polishing).
- the present invention can be appropriately applied not only to the bonding method but also to polishing the peripheral portion of various substrates.
- the polishing after the surface grinding the outer peripheral removal polishing that removes the defective bonding at the outer peripheral portion of the active layer AA 8 and leaves the central portion is adopted.
- the outer peripheral grinding of the active layer layer 18 and the outer peripheral etching of the active layer can be omitted. Thereby, the number of manufacturing steps of the bonded substrate can be reduced, and the manufacturing time of the bonded substrate can be shortened.
- the outer peripheral surface of the active layer can be made smooth over its entire circumference. Since the outer periphery removal polishing is performed using the wafer outer periphery pressing jig, the outer periphery removal polishing of the present invention can be easily performed even with an existing polishing apparatus.
- a part of the outer periphery in the peripheral direction for example, an orientation flat portion or a notch portion
- a part of the active layer is largely removed, and a wide part is formed on the inclined surface. Therefore, even if laser marking is performed on this wide portion, the effect of the irradiated laser is unlikely to reach the active layer. As a result, dust generation from the active layer during laser marking can be controlled.
- the surface of the active layer wafer is subjected to surface grinding, and the outer peripheral portion of the active layer is polished to remove the outer periphery, so that the active employment layer 18 and the support substrate layer 18 are bonded at room temperature.
- the bonding wafer can be formed without peeling the peripheral portion of the wafer without performing the bonding strengthening heat treatment.
- the surface of the active layer can be treated independently of the bonding heat treatment without performing heat treatment in these atmospheres. Crystal defects can be removed from the surface. That is, the surface of the active layer can be a defect-free surface.
- the bonded substrate according to the present invention, the method for manufacturing the same, and the wafer outer peripheral pressing jigs used for the same are used for a bonded substrate in which the active layer and the wafer for supporting substrate are bonded. It is also useful for bonded substrates with SII structures and for bonded substrates by the smart cut method, ELTRAN method, or SiGen method. o
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Manufacturing & Machinery (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Mechanical Engineering (AREA)
- Mechanical Treatment Of Semiconductor (AREA)
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/499,028 US7378332B2 (en) | 2002-05-20 | 2003-05-02 | Laminated substrate, method of manufacturing the substrate, and wafer outer periphery pressing jigs used for the method |
KR1020037014758A KR100577627B1 (ko) | 2002-05-20 | 2003-05-02 | 접합기판과 그 제조방법 및 그것에 사용되는 웨이퍼 외주가압용 지그류 |
JP2004506089A JP4281685B2 (ja) | 2002-05-20 | 2003-05-02 | 貼り合わせ基板の製造方法ならびにそれに使用されるウェーハ外周加圧用治具類 |
CN03804904XA CN1639869B (zh) | 2002-05-20 | 2003-05-02 | 粘合基片的制造方法、以及其中使用的晶片外周加压用夹具类 |
EP03721027A EP1507292B1 (en) | 2002-05-20 | 2003-05-02 | Method of manufacturing the substrate, and wafer outer periphery pressing jigs used for the method |
TW092127765A TWI224356B (en) | 2002-05-20 | 2003-10-07 | Laminated substrate, method of manufacturing the substrate, and wafer outer periphery pressing jigs used for the method |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002-145327 | 2002-05-20 | ||
JP2002145327 | 2002-05-20 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2003098695A1 true WO2003098695A1 (fr) | 2003-11-27 |
Family
ID=29545083
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2003/005652 WO2003098695A1 (fr) | 2002-05-20 | 2003-05-02 | Substrat stratifie, procede de fabrication de substrat, et gabarit de pressage de peripherie externe de plaquettes utilises dans ce procede |
Country Status (7)
Country | Link |
---|---|
US (1) | US7378332B2 (ja) |
EP (1) | EP1507292B1 (ja) |
JP (1) | JP4281685B2 (ja) |
KR (1) | KR100577627B1 (ja) |
CN (1) | CN1639869B (ja) |
TW (1) | TWI224356B (ja) |
WO (1) | WO2003098695A1 (ja) |
Cited By (1)
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JP2009176918A (ja) * | 2008-01-24 | 2009-08-06 | Sumco Corp | Soi基板の製造方法 |
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FR2957189B1 (fr) | 2010-03-02 | 2012-04-27 | Soitec Silicon On Insulator | Procede de realisation d'une structure multicouche avec detourage post meulage. |
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FR2969373B1 (fr) * | 2010-12-20 | 2013-07-19 | St Microelectronics Crolles 2 | Procede d'assemblage de deux plaques et dispositif correspondant |
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US20140054748A1 (en) * | 2012-08-21 | 2014-02-27 | Genmao Liu | Edge trimming method for semiconductor wafer and semiconductor wafer having trimmed edge |
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JP6230381B2 (ja) * | 2013-11-15 | 2017-11-15 | 株式会社ディスコ | 加工方法 |
JP6843232B2 (ja) * | 2016-09-29 | 2021-03-17 | エーファウ・グループ・エー・タルナー・ゲーエムベーハー | 2つの基板をボンディングするための装置および方法 |
US10553474B1 (en) | 2018-08-29 | 2020-02-04 | Taiwan Semiconductor Manufacturing Co., Ltd. | Method for forming a semiconductor-on-insulator (SOI) substrate |
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CN113211306A (zh) * | 2021-05-28 | 2021-08-06 | 福建晶安光电有限公司 | 一种用于半导体晶片抛光的陶瓷载盘 |
CN113510609B (zh) * | 2021-07-12 | 2023-09-08 | 长鑫存储技术有限公司 | 晶圆以及晶圆的处理方法 |
WO2024103220A1 (zh) * | 2022-11-14 | 2024-05-23 | 上海显耀显示科技有限公司 | 一种补偿键合形变量的键合治具 |
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- 2003-05-02 CN CN03804904XA patent/CN1639869B/zh not_active Expired - Lifetime
- 2003-05-02 WO PCT/JP2003/005652 patent/WO2003098695A1/ja active Application Filing
- 2003-05-02 EP EP03721027A patent/EP1507292B1/en not_active Expired - Lifetime
- 2003-05-02 JP JP2004506089A patent/JP4281685B2/ja not_active Expired - Lifetime
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JP2009176918A (ja) * | 2008-01-24 | 2009-08-06 | Sumco Corp | Soi基板の製造方法 |
Also Published As
Publication number | Publication date |
---|---|
TW200425222A (en) | 2004-11-16 |
KR20040028757A (ko) | 2004-04-03 |
EP1507292B1 (en) | 2012-05-02 |
US7378332B2 (en) | 2008-05-27 |
JPWO2003098695A1 (ja) | 2005-09-22 |
EP1507292A1 (en) | 2005-02-16 |
JP4281685B2 (ja) | 2009-06-17 |
KR100577627B1 (ko) | 2006-05-10 |
TWI224356B (en) | 2004-11-21 |
US20050014347A1 (en) | 2005-01-20 |
CN1639869A (zh) | 2005-07-13 |
EP1507292A4 (en) | 2007-03-28 |
CN1639869B (zh) | 2010-05-26 |
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