WO2021199585A1 - 基板処理方法及び基板処理装置 - Google Patents
基板処理方法及び基板処理装置 Download PDFInfo
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- WO2021199585A1 WO2021199585A1 PCT/JP2021/001526 JP2021001526W WO2021199585A1 WO 2021199585 A1 WO2021199585 A1 WO 2021199585A1 JP 2021001526 W JP2021001526 W JP 2021001526W WO 2021199585 A1 WO2021199585 A1 WO 2021199585A1
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- substrate
- wafer
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- surface film
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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
- H01L21/26—Bombardment with radiation
- H01L21/263—Bombardment with radiation with high-energy radiation
- H01L21/268—Bombardment with radiation with high-energy radiation using electromagnetic radiation, e.g. laser radiation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/50—Working by transmitting the laser beam through or within the workpiece
- B23K26/53—Working by transmitting the laser beam through or within the workpiece for modifying or reforming the material inside the workpiece, e.g. for producing break initiation cracks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
- B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
- B23K26/062—Shaping the laser beam, e.g. by masks or multi-focusing by direct control of the laser beam
- B23K26/0622—Shaping the laser beam, e.g. by masks or multi-focusing by direct control of the laser beam by shaping pulses
- B23K26/0624—Shaping the laser beam, e.g. by masks or multi-focusing by direct control of the laser beam by shaping pulses using ultrashort pulses, i.e. pulses of 1ns or less
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/36—Removing material
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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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/302—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
- H01L21/304—Mechanical treatment, e.g. grinding, polishing, cutting
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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
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/67005—Apparatus not specifically provided for elsewhere
- H01L21/67011—Apparatus for manufacture or treatment
- H01L21/67092—Apparatus for mechanical treatment
Definitions
- This disclosure relates to a substrate processing method and a substrate processing apparatus.
- Patent Document 1 discloses a method for grinding a wafer.
- Such a wafer grinding method includes a step of irradiating a laser beam along the outer peripheral edge at a position inside a predetermined amount from one surface side of the wafer to remove the outer peripheral portion of the wafer, and removing the outer peripheral portion. It includes a step of grinding a surface to be ground of a wafer to form a predetermined finished thickness.
- the technique according to the present disclosure is a polymerization substrate in which a first substrate and a second substrate are joined, and particles and the like on the peripheral edge of the second substrate exposed by removing the first substrate from the second substrate. Appropriately suppress scattering.
- One aspect of the present disclosure is a method for treating a polymerized substrate in which a first substrate formed by laminating surface films and a second substrate are bonded to each other, and the first substrate to be removed is used.
- a method for treating a polymerized substrate in which a first substrate formed by laminating surface films and a second substrate are bonded to each other, and the first substrate to be removed is used.
- particles and the like are scattered on the peripheral edge of the second substrate exposed by removing the first substrate from the second substrate. Can be appropriately suppressed.
- the polymer wafer is formed on a polymer wafer in which semiconductor substrates (hereinafter referred to as "wafers") having a plurality of devices such as electronic circuits formed on the surface thereof are bonded to each other.
- wafers semiconductor substrates
- the thinning of one wafer and the transfer of the device formed on the first wafer to the second wafer forming the polymerized wafer are performed.
- the peripheral edge of the wafer is chamfered, but when the polymerized wafer is thinned or transferred as described above, the peripheral edge of the thinned first wafer or the polymerized wafer after transfer is performed.
- the portion may have a sharp and pointed shape (so-called knife edge shape). Then, chipping occurs at the peripheral edge of these wafers, and the wafer may be damaged. Therefore, before performing the thinning process or the transfer process, it is necessary to perform a process for suppressing the formation of the knife edge shape on the peripheral edge of the wafer in advance.
- the grinding method described in Patent Document 1 described above removes the peripheral edge of the wafer before the thinning treatment, that is, so-called edge trim, as an example of a method of suppressing the formation of a knife edge shape on the wafer by the thinning treatment. It is a grinding method for performing.
- edge trim of the wafer is performed by the method described in Patent Document 1
- particles and a residual film may remain on the surface of the exposed wafer after the edge trim.
- the particles and the residual film remaining on the surface of the wafer in this way may fall or scatter during transportation or in a post-process, thereby contaminating the apparatus, hoops, or other wafers. Therefore, there is room for improvement in the conventional edge trimming method.
- the technique according to the present disclosure is a polymerization substrate in which a first substrate and a second substrate are joined, and particles and the like on the peripheral edge of the second substrate exposed by removing the first substrate from the second substrate. Appropriately suppress scattering.
- the wafer processing system as the substrate processing apparatus and the wafer processing method as the substrate processing method according to the present embodiment will be described with reference to the drawings.
- elements having substantially the same functional configuration are designated by the same reference numerals, so that duplicate description will be omitted.
- the wafer processing system 1 As a polymerization substrate in which the first wafer W1 as the first substrate and the second wafer W2 as the second substrate are bonded. Processing is performed on the polymerized wafer T of. Then, in the wafer processing system 1, the peripheral portion We of the first wafer W1 is removed.
- the front surface W1a the surface on the side bonded to the second wafer W2
- the back surface W1b the surface opposite to the front surface W1a
- the surface on the side bonded to the first wafer W1 is referred to as the front surface W2a, and the surface opposite to the front surface W2a is referred to as the back surface W2b.
- a region radially inside the peripheral edge portion We as a removal target is referred to as a central portion Wc.
- the first wafer W1 is a semiconductor wafer such as a silicon substrate, and a device layer D1 including a plurality of devices is formed on the surface W1a. Further, a bonding film F1 is further formed on the device layer D1 and is bonded to the second wafer W2 via the bonding film F1. Examples of the bonding film F1 include an oxide film (SiO 2 film, TEOS film), a SiC film, a SiCN film, and an adhesive.
- the peripheral edge portion We of the first wafer W1 is chamfered, and the cross section of the peripheral edge portion We becomes thinner toward the tip thereof.
- the peripheral edge portion We is a portion that is removed in the edge trim described later, and is, for example, in the range of 0.5 mm to 3 mm in the radial direction from the outer end portion of the first wafer W1.
- a laser absorption layer (not shown) capable of absorbing the laser light irradiated to the inside of the polymerized wafer T when the peripheral edge portion We is removed is further formed. You may. Further, the bonding film F1 formed on the device layer D1 may be used as the laser absorption layer.
- the second wafer W2 has, for example, the same configuration as the first wafer W1, a device layer D2 and a bonding film F2 are formed on the surface W2a, and the peripheral edge portion is chamfered.
- the second wafer W2 does not have to be a device wafer on which the device layer D2 is formed, and may be, for example, a support wafer that supports the first wafer W1. In such a case, the second wafer W2 functions as a protective material for protecting the device layer D1 of the first wafer W1.
- the device layers D1 and D2 formed on the first wafer W1 and the second wafer W2, and the bonding films F1 and F2 may be referred to as "surface films", respectively.
- a plurality of surface films are laminated and formed on the first wafer W1 and the second wafer W2 according to the present embodiment.
- the wafer processing system 1 has a configuration in which the loading / unloading block G1, the transport block G2, and the processing block G3 are integrally connected.
- the carry-in / out block G1, the transport block G2, and the processing block G3 are arranged side by side in this order from the negative direction side of the X-axis.
- a cassette C capable of accommodating a plurality of polymerized wafers T is carried in / out from the outside.
- the carry-in / out block G1 is provided with a cassette mounting stand 10.
- a plurality of, for example, three cassettes C can be freely mounted in a row on the cassette mounting table 10 in the Y-axis direction.
- the number of cassettes C mounted on the cassette mounting table 10 is not limited to this embodiment and can be arbitrarily determined.
- the transfer block G2 is provided with a wafer transfer device 20 adjacent to the cassette mounting table 10 on the X-axis positive direction side of the cassette mounting table 10.
- the wafer transfer device 20 is configured to be movable on a transfer path 21 extending in the Y-axis direction. Further, the wafer transfer device 20 has, for example, two transfer arms 22 and 22 that hold and transfer the polymerized wafer T.
- Each transport arm 22 is configured to be movable in the horizontal direction, the vertical direction, the horizontal axis, and the vertical axis.
- the configuration of the transport arm 22 is not limited to this embodiment, and any configuration can be adopted.
- the wafer transfer device 20 is configured to be able to transfer the polymerized wafer T to the cassette C of the cassette mounting table 10 and the transition device 30 described later.
- the transfer block G2 is provided with a transition device 30 for delivering the polymerized wafer T adjacent to the wafer transfer device 20 on the X-axis positive direction side of the wafer transfer device 20.
- the processing block G3 includes a wafer transfer device 40, a peripheral edge removing device 50 as a removing section, a cleaning device 60, an internal reforming device 70, a second laser irradiation section and an interface reforming device 80 as an oxide film removing section, and a first. It has a film processing apparatus 90 as a laser irradiation unit of 1.
- the wafer transfer device 40 is configured to be movable on a transfer path 41 extending in the X-axis direction. Further, the wafer transfer device 40 has, for example, two transfer arms 42 and 42 that hold and transfer the polymerized wafer T. Each transport arm 42 is configured to be movable in the horizontal direction, the vertical direction, the horizontal axis, and the vertical axis. The configuration of the transport arm 42 is not limited to this embodiment, and any configuration can be adopted.
- the wafer transfer device 40 is configured to be capable of transporting the polymerized wafer T to the transition device 30, the peripheral edge removing device 50, the cleaning device 60, the internal reformer 70, the interface reformer 80, and the film processing device 90. Has been done.
- the peripheral edge removing device 50 removes the peripheral edge portion We of the first wafer W1, that is, performs edge trim processing.
- the cleaning device 60 cleans the polymerized wafer T.
- the internal reformer 70 irradiates the inside of the first wafer W1 with a laser beam (internal laser beam, for example, a YAG laser), and the peripheral surface reforming layer M1 serving as a base point for peeling the peripheral edge portion We and the peripheral edge portion We.
- a split reformed layer M2 is formed as a base point for fragmentation.
- the interface modifier 80 irradiates the interface between the first wafer W1 and the second wafer W2 with a laser beam (interface laser beam, for example, a CO 2 laser) to form an unbonded region Ae described later.
- the film processing apparatus 90 irradiates the exposed surface (surface film) at the peripheral edge of the second wafer W2 by edge trim processing with laser light (laser light for film treatment, for example, CO 2 laser) and adheres to the exposed surface. Suppresses the scattering of the generated particles.
- laser light laser light for film treatment, for example, CO 2 laser
- the above wafer processing system 1 is provided with a control device 100 as a control unit.
- the control device 100 is, for example, a computer and has a program storage unit (not shown).
- the program storage unit stores a program that controls the processing of the polymerized wafer T in the wafer processing system 1. Further, the program storage unit also stores a program for controlling the operation of the drive system of the above-mentioned various processing devices and transfer devices to realize the wafer processing described later in the wafer processing system 1.
- the program may be recorded on a computer-readable storage medium H and may be installed on the control device 100 from the storage medium H.
- the wafer processing performed by using the wafer processing system 1 configured as described above will be described.
- the first wafer W1 and the second wafer W2 are bonded to each other in an external bonding device (not shown) of the wafer processing system 1 to form a polymerized wafer T in advance.
- the cassette C containing the plurality of polymerized wafers T is placed on the cassette mounting table 10 of the loading / unloading block G1.
- the polymerized wafer T in the cassette C is taken out by the wafer transfer device 20.
- the polymerized wafer T taken out from the cassette C is delivered to the wafer transfer device 40 via the transition device 30, and then transferred to the interface reformer 80.
- the interface modifier 80 as shown in FIG. 3A, the interface between the first wafer W1 and the device layer D1 (more specifically, the interface) while rotating the layered wafer T (first wafer W1). Is irradiated with a laser beam (for example, a CO 2 laser having a wavelength of 8.9 ⁇ m to 11 ⁇ m) to form the unbonded region Ae (step S1 in FIG. 4).
- a laser beam for example, a CO 2 laser having a wavelength of 8.9 ⁇ m to 11 ⁇ m
- the interface between the first wafer W1 and the device layer D1 is modified or peeled off, and the bonding strength between the first wafer W1 and the second wafer W2 is reduced or eliminated.
- the annular unbonded region Ae and the first wafer W1 and the second wafer W2 are bonded to the interface between the first wafer W1 and the device layer D1 in the radial inside of the unbonded region Ae.
- a joint region Ac is formed.
- the peripheral edge portion We of the first wafer W1 to be removed is removed, and the presence of the unbonded region Ae in this way appropriately removes the peripheral edge portion We. Can be done.
- an oxide film for example, a SiO 2 film
- a laser transmission inhibitory film Ox is naturally formed as a laser transmission inhibitory film Ox on the back surface W1b of the first wafer W1 due to, for example, contact with the atmosphere.
- an oxide film for example, SiO 2 film
- a nitride film for example, Si 3 N 4 film
- laser light is irradiated from the back surface W1b side of the first wafer W1 to form an unbonded region Ae.
- the laser transmission inhibitory film Ox is formed on the back surface W1b in this way, The unbonded region Ae may not be formed properly.
- the first wafer W1 and the device which are the positions where the unbonded region Ae is appropriately formed since the laser light applied to the polymerized wafer T is absorbed and reflected by the laser transmission inhibiting film Ox, the first wafer W1 and the device which are the positions where the unbonded region Ae is appropriately formed. It is not possible to irradiate the interface of layer D1 with laser light.
- the laser transmission inhibitory film Ox formed on the back surface W1b of the first wafer W1 may be removed prior to the formation of the unbonded region Ae (step S1) (step of FIG. 4). S0).
- the laser transmission inhibitory film Ox can be removed by any method.
- the laser transmission inhibitory film Ox may be removed by irradiating the interface reformer 80 with laser light (CO 2 laser).
- an inhibitory film removing device (not shown) as an inhibitory film removing unit is provided outside the interface reforming device 80 by stacking it with, for example, a cleaning device 60. Removal may be performed.
- treatments such as wet etching, grinding, and polishing on the back surface W1b of the first wafer W1 can be performed alone or in combination.
- a mechanism for performing wet etching, grinding, polishing, or the like may be provided inside the cleaning device 60.
- the removal of the laser transmission inhibitory film Ox may be performed on the entire surface of the back surface W1b of the first wafer W1, or as shown in FIG. 5 (b), at least the first laser beam irradiation position. It may be performed only on the peripheral edge We of the wafer W1. However, removing the laser transmission inhibitory film Ox only on the peripheral portion We in this way shortens the processing time and resources (use) as compared with the case where the laser transmission inhibition film Ox is removed on the entire surface of the back surface W1b. It is possible to save the amount of chemical solution and the amount of laser light to be irradiated), reduce the cost, and save energy.
- the polymerized wafer T on which the unbonded region Ae is formed is then transferred to the internal reformer 70 by the wafer transfer device 40.
- the peripheral reforming layer M1 and the split reforming layer M2 are formed inside the first wafer W1 (step S2 in FIG. 4).
- the peripheral edge modification layer M1 serves as a base point when removing the peripheral edge portion We in the edge trim described later.
- the split modified layer M2 serves as a base point for fragmentation of the peripheral portion We to be removed.
- the divisional modification layer M2 may be omitted in order to avoid complication of the illustration.
- the formation position of the peripheral modification layer M1 is determined to be slightly inward in the radial direction from the inner end of the unbonded region Ae formed in step S1.
- the peripheral modification layer M1 is formed at a position overlapping the boundary between the bonded region Ac and the unbonded region Ae (hereinafter, simply referred to as “boundary”), but is displaced in the radial direction due to, for example, a processing error. May be formed.
- the peripheral modification layer M1 is formed at a position radially outward from the boundary, that is, in the unbonded region Ae, after the peripheral edge We is removed, the first wafer W2 is first.
- the wafer W1 may be in a floating state.
- the peripheral modification layer M1 by controlling the peripheral modification layer M1 to be formed radially inside the boundary, for example, even if the formation position shifts due to a processing error, the position overlaps the boundary or is radially outside the boundary. Even if there is, the peripheral modification layer M1 can be formed at a position close to the boundary, and the formation of the peripheral modification layer M1 at a position radially outward from the boundary can be suppressed.
- cracks C1 extend from the peripheral modification layer M1 formed inside the first wafer W1 in the thickness direction of the first wafer W1.
- the lower end of the crack C1 reaches, for example, the surface W1a of the first wafer W1.
- the polymerized wafer T in which the peripheral modification layer M1 and the split reforming layer M2 are formed inside the first wafer W1 is then transported to the peripheral edge removing device 50 by the wafer transfer device 40.
- the peripheral edge removing device 50 as shown in FIG. 3C, the peripheral edge portion We of the first wafer W1 is removed, that is, the edge trim processing is performed (step S3 in FIG. 4).
- the peripheral edge portion We is peeled off from the central portion Wc of the first wafer W1 with the peripheral edge modification layer M1 and the crack C1 as the base points, and the device layer D1 (second wafer W2) with the unbonded region Ae as the base point. ) Is peeled off.
- the peripheral portion We to be removed is fragmented with the split reforming layer M2 and the crack C2 as the base points.
- a blade having a wedge shape may be inserted at the interface between the first wafer W1 and the second wafer W2 forming the polymerization wafer T. Further, for example, an air blow or a water jet may be injected to press and remove the peripheral portion We. In this way, in edge trimming, by applying an impact to the peripheral edge portion We of the first wafer W1, the peripheral edge portion We is appropriately peeled off from the peripheral edge modifying layer M1 and the crack C1 as a base point. Further, as described above, since the bonding strength between the first wafer W1 and the second wafer W2 is lowered by the unbonded region Ae, the peripheral portion We is appropriately removed.
- the polymerized wafer T from which the peripheral portion We of the first wafer W1 has been removed is then transported to the film processing device 90 by the wafer transfer device 40.
- the film processing apparatus 90 as shown in FIG. 3D, a process for suppressing scattering of particles on the peripheral edge of the second wafer W2 after the peripheral edge We has been removed (hereinafter, “film treatment””. In some cases) is performed (step S4 in FIG. 4).
- FIG. 7 The surface of the second wafer W2 after the removal of the peripheral edge portion We, specifically, the exposed surface Fe of the surface film remaining on the peripheral edge portion of the second wafer W2 exposed by the removal of the first wafer W1 is shown in FIG. As shown in No. 7, a residual film and particles P (hereinafter, referred to as “particles and the like”) remain. These particles and the like may cause contamination of the inside of the wafer processing system 1, the inside of the cassette C, and other polymerized wafers T by peeling, dropping, or scattering during the transfer or process of the polymerized wafer T.
- the first wafer W1 and the second wafer W2 are formed at the joining interface between the first wafer W1 and the second wafer W2 after the peripheral edge portion We is removed at the time of joining the first wafer W1 and the second wafer W2.
- the edge void V air layer
- This edge void V may cause the generation of particles or the like by bursting due to the influence of heating or cooling, pressurization or depressurization of the polymerized wafer T in the subsequent process.
- the first method is a method of removing the exposed surface Fe that can be a source of particles and the like. That is, for example, the exposed surface Fe is irradiated with a laser beam (for example, a CO 2 laser) to remove at least the surface layer of the surface film on which particles and the like remain as shown in FIG. 8 (a). Further, for example, when an edge void V is formed at the bonding interface between the first wafer W1 and the second wafer W2, the bonding interface is irradiated with laser light, and as shown in FIG. 8B, the first The surface film (device layer D1 and bonding film F1) of the wafer W1 may be removed.
- a laser beam for example, a CO 2 laser
- all the exposed surface Fe is irradiated with a laser beam (for example, a CO 2 laser) and left on the peripheral edge of the second wafer W2 after the peripheral edge We is removed as shown in FIG. 8 (c).
- the surface films may be removed.
- the particles and the like remaining on the surface of the exposed surface Fe are removed together with the surface film removed by the irradiation of the laser beam, so that the particles and the like are suppressed from being peeled off, dropped, or scattered.
- the surface film in this way and exposing the edge void V (bonding interface) as shown in FIG. 8B the air accumulated in the forming portion of the edge void V is released, and the edge void V is released. The burst of V is suppressed.
- FIG. 8C by removing all the surface film remaining on the peripheral edge of the second wafer W2, the particles P and the like are separated from the peripheral edge of the second wafer W2 in the subsequent process. , Will not fall or scatter.
- the second method is a method of modifying the exposed surface Fe, which can be a source of particles and the like. That is, for example, the exposed surface Fe is irradiated with a laser beam (for example, a CO 2 laser) to melt the surface layer of the surface film on which at least particles and the like remain as shown in FIG. 9A, and further fix the melted portion.
- a laser beam for example, a CO 2 laser
- the "melting" and “adhesion” of the surface film are collectively referred to as "modification of the surface film”
- the edge void V is formed at the bonding interface between the first wafer W1 and the second wafer W2
- the inside of the surface film of the first wafer W1 is irradiated with laser light, and FIG.
- the surface film (device layer D1 and bonding film F1) of the first wafer W1 may be integrally modified.
- the device layer D1 remaining on the second wafer W2 after the peripheral portion We is removed, and the exposed portion of the bonding film F1 are melted by irradiation with laser light, and then the melted device layer D1 and the bonding are used.
- the film F1 may be formed as an integral fixed object.
- the exposed surface Fe is irradiated with a laser beam (for example, a CO 2 laser), and as shown in FIG. 9 (c), all the surfaces remaining on the peripheral edge of the second wafer W2 after the peripheral edge We are removed.
- the films may be integrally modified.
- the exposed portions of the device layers D1 and D2 and the bonding films F1 and F2 remaining on the second wafer W2 after the peripheral portion We are removed are melted by irradiation with laser light, and then the melted device layer D1 and D2 and the bonding films F1 and F2 may be formed as an integral fixed object.
- the particles and the like remaining on the surface of the exposed surface Fe are fixed together with the surface film melted by the irradiation of the laser beam.
- the surface film and the particles and the like are formed as an integral fixed substance.
- the scattering of particles and the like is suppressed.
- FIG. 9B by integrally modifying the surface film of the first wafer W1, the air accumulated in the edge void V is released to the outside in the process of modifying the surface film. As a result, the rupture of the edge void V can be suppressed.
- FIG. 9C by integrally modifying all the surface films remaining on the peripheral edge of the second wafer W2, particles are formed from the peripheral edge of the second wafer W2 in the subsequent process. P and the like will not be peeled off, dropped, or scattered.
- the polymerized wafer T whose surface film on the exposed surface Fe has been removed or modified is then transported to the cleaning device 60 by the wafer transfer device 40.
- the cleaning device 60 the peripheral edge portion We is removed, and the back surface W1b and the exposed portion of the first wafer W1 after the film treatment is performed are cleaned (step S5 in FIG. 4).
- the back surface W2b of the second wafer W2 may be cleaned together with the back surface W1b of the first wafer W1.
- the polymerized wafer T to which all the wafer processing has been performed is transferred to the cassette C of the cassette mounting table 10 by the wafer transfer device 20 via the transition device 30. In this way, a series of wafer processing in the wafer processing system 1 is completed.
- the above embodiment by removing or modifying at least the surface layer of the exposed portion by irradiating the laser beam after removing the peripheral portion We, it is possible to appropriately suppress the scattering of particles and the like.
- the air accumulated in the edge void V can be released, which is caused by the edge void V. It is also possible to appropriately suppress the generation of particles.
- an unbonded region Ae that reduces the bonding strength of the first wafer W1 and the second wafer W2 is formed prior to the edge trim.
- the peripheral edge portion We is easily peeled off from the second wafer W2, so that particles and the like are suppressed from remaining on the peeling interface (exposed surface Fe). That is, the scattering of particles and the like after the removal of the peripheral portion We is further appropriately suppressed.
- the unbonded region Ae can be appropriately formed. ..
- the unbonded region Ae is formed by the interface reformer 80, and the film treatment of the exposed surface Fe is performed by the film treatment device 90.
- the formation of the unbonded region Ae and the film treatment are performed.
- the formation of the unbonded region Ae and the film treatment can be configured to be performed in the same apparatus. Specifically, for example, the polymerized wafer T after the peripheral edge portion We of the first wafer W1 has been removed is carried back from the peripheral edge removing device 50 to the interface reforming device 80 by the wafer transfer device 40, and the interface reforming is performed.
- the film treatment may be performed in the device 80.
- the peripheral portion We of the first wafer W1 is exposed by peeling from the second wafer W2.
- the application example of the technique according to the present disclosure content is not limited to this.
- the technique according to the present disclosure. Can be applied.
- the unbonded region Ae formed on the entire interface between the first wafer W1 and the device layer D1 is formed.
- the first wafer W1 is peeled off as a base point.
- the bonding film F1 may float with respect to the second wafer W2 at the forming interface of the unbonded region Ae, and the knife edge shape K may be formed as shown in FIG. 10 (b). be.
- the unbonded region Ae is appropriately formed at the unbonded portion (for example, the portion where the chamfering process is performed at the peripheral portion) of the first wafer W1 and the second wafer W2.
- the residual film K2 remains on the peripheral edge or the surface of the first wafer W1 after peeling. If the residual film K2 remains on the first wafer W1 in this way, it may also cause the generation of particles. Therefore, in the wafer processing system 1 according to the present embodiment, a process for removing the residual film K2 remaining on the first wafer W1 after peeling, for example, wet etching may be further performed.
- the surface film remaining on the peripheral edge of the second wafer W2 is removed by irradiation with a laser beam (for example, CO 2 laser), in other words, the surface film is removed.
- a laser beam for example, CO 2 laser
- the flatness of the surface W2a of the second wafer W2 may be deteriorated (the surface state becomes rough) due to the irradiation of the laser beam.
- the wafer processing in the subsequent process may not be properly executed, and specifically, for example, the formation of a film on the surface W2a may not be properly executed.
- the irradiation conditions of the laser beam when removing the surface films (bonding films F1, F2 and device layers D1 and D2) remaining on the surface W2a of the second wafer W2 are controlled, and after the surface film is removed.
- a fine periodic structure is formed on the surface W2a of the above.
- the fine periodic structure is, for example, a surface structure composed of irregularities of nanoscale or less (see, for example, Patent Document 2), and by forming the fine periodic structure in this way, the flatness of the surface W2a can be improved. can.
- a laser beam for example, an ultrashort pulse such as a femtosecond laser or a picosecond laser
- Laser is applied to completely remove all the surface films (device layers D1 and D2 and bonding films F1 and F2) remaining on the peripheral edge of the second wafer W2 as shown in FIG.
- the irradiation condition of the laser light is set to the surface W2a with a fine periodic structure Fp (FIG. 11).
- deterioration of the flatness of the surface W2a is suppressed by irradiating the surface W2a with a laser beam under desired conditions that can form a fine periodic structure Fp.
- the irradiation conditions (fluence and overlap) of the laser beam when forming the fine periodic structure Fp on the surface W2a are the same as those of the laser beam when removing the surface film remaining on the peripheral edge of the second wafer W2 as described above. It may be the same as the irradiation condition. In other words, the surface film may be removed and the fine periodic structure Fp may be formed consistently without changing the laser irradiation conditions on the way.
- the irradiation conditions of the laser beam are not limited to this, and different irradiation conditions may be set for the removal of the surface film and the formation of the fine periodic structure Fp.
- irradiation conditions that can shorten the time required for removing the surface film, in other words, the surface at the time of laser light irradiation.
- Laser light may be irradiated under processing conditions that increase the removal volume of the film.
- the irradiation condition may be, for example, a condition in which the fine periodic structure Fp cannot be formed on the surface W2a.
- the irradiation conditions that can form the fine periodic structure Fp are set. Adjustments may be made. In other words, in each of the removal of the surface film and the formation of the microperiodic structure Fp, the fluence and overlap of the laser light are changed so as to be under desired conditions, thereby shortening the processing time of the entire laser processing. It may be.
- the fine periodic structure Fp was formed on the entire peripheral surface of the peripheral portion of the second wafer W2 from which the surface films (device layers D1 and D2 and the bonding films F1 and F2) were removed.
- the range of formation of Fp is not limited to this.
- the fine periodic structure Fp may be formed only in a part of the peripheral portion of the second wafer W2 depending on the purpose of wafer processing or the like.
- an unbonded region Ae is formed at the interface between the first wafer W1 and the device layer D1, and the peripheral edge We is removed (edge trim) at the interface.
- the interface for removing the peripheral edge We of the first wafer W1 is not limited to this interface. That is, for example, an unbonded region Ae is formed at the interface between the device layer D1 and the bonding film F1 or the interface between the device layer D2 and the bonding film F2, and the peripheral portion We is removed at the interface where the unbonded region Ae is formed. Edge trim) may be performed.
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Abstract
Description
また例えば、第1のウェハW1と第2のウェハW2の接合界面にエッジボイドVが形成されている場合には、当該接合界面にレーザ光を照射し、図8(b)に示すように第1のウェハW1の表面膜(デバイス層D1、及び接合用膜F1)を除去してもよい。
更に例えば、露出面Feに対してレーザ光(例えばCO2レーザ)を照射し、図8(c)に示すように周縁部Weの除去後の第2のウェハW2の周縁部に残する全ての表面膜(デバイス層D1、D2及び接合用膜F1、F2)を除去してもよい。
また、このように表面膜を除去して図8(b)に示したようにエッジボイドV(接合界面)を露出させることにより、エッジボイドVの形成部に蓄積されていた空気が解放され、当該エッジボイドVの破裂が抑制される。
更に、図8(c)に示したように第2のウェハW2の周縁部に残る表面膜を全て除去することで、後工程において、当該第2のウェハW2の周縁部からパーティクルP等が剥離、落下、又は飛散することがなくなる。
また例えば、第1のウェハW1と第2のウェハW2の接合界面にエッジボイドVが形成されている場合には、第1のウェハW1の表面膜の内部にレーザ光を照射し、図9(b)に示すように第1のウェハW1の表面膜(デバイス層D1、及び接合用膜F1)を一体に改質してもよい。換言すれば、周縁部Weの除去後に第2のウェハW2に残留するデバイス層D1、及び接合用膜F1の露出部分をレーザ光の照射により溶融させた後、溶融したデバイス層D1、及び接合用膜F1を一体の固着物として形成してもよい。
更に例えば、露出面Feに対してレーザ光(例えばCO2レーザ)を照射し、図9(c)に示すように周縁部Weの除去後の第2のウェハW2の周縁部に残る全ての表面膜(デバイス層D1、D2及び接合用膜F1、F2)を一体に改質してもよい。換言すれば、周縁部Weの除去後に第2のウェハW2に残留するデバイス層D1、D2及び接合用膜F1、F2の露出部分をレーザ光の照射により溶融させた後、溶融したデバイス層D1、D2及び接合用膜F1、F2を一体の固着物として形成してもよい。
また、図9(b)に示したように第1のウェハW1の表面膜を一体に改質することにより、この表面膜の改質にかかる過程においてエッジボイドVに蓄積された空気が外部へ解放され、これにより当該エッジボイドVの破裂を抑制できる。
更に、図9(c)に示したように第2のウェハW2の周縁部に残る全ての表面膜を一体に改質することで、後工程において、当該第2のウェハW2の周縁部からパーティクルP等が剥離、落下、又は飛散することがなくなる。
そして、かかる照射条件で第2のウェハW2の表面W2aにレーザ光を更に照射することで、表面膜の除去後の当該表面W2aに微細周期構造Fpを形成する。
しかしながらレーザ光の照射条件はこれに限られず、表面膜の除去と微細周期構造Fpの形成において、それぞれ異なる照射条件が設定されてもよい。
そして、例えば表面膜を概ね除去した後、表面W2aに残る残膜を除去するとともに、表面W2aの表面処理(微細周期構造Fpの形成)を行うに際して、微細周期構造Fpを形成し得る照射条件に調整を行ってもよい。
換言すれば、表面膜の除去と微細周期構造Fpの形成のそれぞれにおいて、レーザ光のフルエンス及びオーバーラップを所望の条件でとなるように変更し、これによりレーザ処理全体の処理時間を短縮するようにしてもよい。
かかる場合であっても、周縁部Weの除去後の露出面Feに対してレーザ光の照射を行うことで、図8や図9に示したようにパーティクル等の飛散を抑制できる。
また、このように第1のウェハW1とデバイス層D1の界面よりも第2のウェハW2側に位置する界面において周縁部Weの除去を行うことで、第2のウェハW2の周縁部に残る表面膜の厚みが小さくなる。換言すれば、第2のウェハW2の周縁部に残る表面膜の体積が小さくなるため、上述したように当該表面膜を完全除去する際において、表面膜の除去体積が減少し、当該表面膜の除去に係るスループットを向上できる。
D2 デバイス層
F1 接合用膜
F2 接合用膜
Fe 露出面
T 重合ウェハ
W1 第1のウェハ
W2 第2のウェハ
We 周縁部
Claims (18)
- 表面膜が積層して形成された第1の基板と、第2の基板と、が接合された重合基板の処理方法であって、
除去対象の前記第1の基板を前記第2の基板から剥離することと、
前記第1の基板の剥離により露出した、前記第2の基板の周縁部に残る前記表面膜の露出表面に対してレーザ光を照射して、少なくとも前記第2の基板の周縁部における前記表面膜の表層を除去又は改質することと、を含む、基板処理方法。 - 前記第1の基板の剥離においては、少なくとも当該第1の基板の周縁部を前記第2の基板から剥離する、請求項1に記載の基板処理方法。
- 前記表面膜の除去又は改質においては、前記露出表面から前記第1の基板と前記第2の基板の接合界面までの前記表面膜を除去又は改質する、請求項1又は2に記載の基板処理方法。
- 前記表面膜の除去又は改質においては、前記第2の基板の周縁部に残る前記表面膜をすべて除去し、前記第2の基板の表面を露出させる、請求項1又は2に記載の基板処理方法。
- 前記表面膜の除去に際し、前記レーザ光をパルス状に照射し、
当該レーザ光のエネルギー密度、及びレーザ照射領域の重なりを制御する、請求項4に記載の基板処理方法。 - 前記レーザ光は超短パルスレーザ光である、請求項4又は5に記載の基板処理方法。
- 前記第2の基板の周縁部に残る前記表面膜の除去に際して、
前記表面膜にレーザ光を照射して、前記表面膜を除去することと、
前記表面膜の除去後の前記第2の基板の表面にレーザ光を照射して、前記表面膜の残膜を除去するとともに、当該第2の基板の表面に微細周期構造を形成することと、を順次行う、請求項6に記載の基板処理方法。 - 前記周縁部の除去に先立ち、
前記第1の基板の裏面に形成された前記レーザ光の阻害膜を除去することと、
前記重合基板の内部にレーザ光を照射して、前記周縁部における前記第1の基板と前記第2の基板の接合強度を低下することと、を含む、請求項1~7のいずれか一項に記載の基板処理方法。 - 前記阻害膜の除去を、前記第1の基板における前記周縁部と対応する位置において行う、請求項8に記載の基板処理方法。
- 表面膜が積層して形成された第1の基板と、第2の基板と、が接合された重合基板を処理する装置であって、
除去対象の前記第1の基板を前記第2の基板から剥離する除去部と、
前記第1の基板の剥離により露出した、前記第2の基板の周縁部に残る前記表面膜の露出表面に対してレーザ光を照射する第1のレーザ照射部と、
前記除去部及び前記第1のレーザ照射部の動作を制御する制御部と、を有し、
前記制御部は、
前記レーザ光の照射により、少なくとも前記周縁部の除去により露出した、前記第2の基板の周縁部における前記表面膜の表層を除去又は改質するように、前記第1のレーザ照射部の動作を制御する、基板処理装置。 - 前記制御部は、少なくとも前記第1の基板の周縁部を前記第2の基板から剥離するように前記除去部の動作を制御する、請求項10に記載の基板処理装置。
- 前記制御部は、前記レーザ光の照射により、前記露出表面から前記第1の基板と前記第2の基板の接合界面までの前記表面膜を除去又は改質するように、前記第1のレーザ照射部の動作を制御する、請求項10又は11に記載の基板処理装置。
- 前記制御部は、前記レーザ光の照射により、前記第2の基板の周縁部に残る前記表面膜をすべて除去し、前記第2の基板の表面を露出させるように、前記第1のレーザ照射部の動作を制御する、請求項10又は11に記載の基板処理装置。
- 前記制御部は、前記表面膜の除去に際し、前記レーザ光をパルス状に照射し、当該レーザ光のエネルギー密度、及びレーザ照射領域の重なりを制御するように、前記第1のレーザ照射部の動作を制御する請求項13に記載の基板処理装置。
- 前記レーザ光は超短パルスレーザ光である、請求項13又は14に記載の基板処理装置。
- 前記制御部は、前記第2の基板の周縁部に残る前記表面膜の除去に際して、
前記表面膜にレーザ光を照射して、前記表面膜を除去し、
前記表面膜の除去後の前記第2の基板の表面にレーザ光を照射して、前記表面膜の残膜を除去するとともに、当該第2の基板の表面に微細周期構造を形成するように、前記第1のレーザ照射部の動作を制御する、請求項15に記載の基板処理装置。 - 前記第1の基板の裏面に形成された前記レーザ光の阻害膜を除去する阻害膜除去部と、
前記重合基板の内部にレーザ光を照射して、前記周縁部における前記第1の基板と前記第2の基板の接合強度を低下する第2のレーザ照射部と、を有する、請求項10~16のいずれか一項に記載の基板処理装置。 - 前記制御部は、前記第1の基板における周縁部と対応する位置において前記阻害膜を除去するように、前記阻害膜除去部の動作を制御する、請求項17に記載の基板処理装置。
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| JP2023143077A (ja) * | 2022-03-25 | 2023-10-06 | 東京エレクトロン株式会社 | 処理方法及び処理システム |
| WO2024142947A1 (ja) * | 2022-12-26 | 2024-07-04 | 東京エレクトロン株式会社 | 重合基板、基板処理方法及び基板処理システム |
| WO2024247740A1 (ja) * | 2023-05-30 | 2024-12-05 | 東京エレクトロン株式会社 | 基板処理方法及び基板処理システム |
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| WO2019176589A1 (ja) * | 2018-03-14 | 2019-09-19 | 東京エレクトロン株式会社 | 基板処理システム、基板処理方法及びコンピュータ記憶媒体 |
| WO2020012986A1 (ja) * | 2018-07-12 | 2020-01-16 | 東京エレクトロン株式会社 | 基板処理システム及び基板処理方法 |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2023121926A (ja) * | 2022-02-22 | 2023-09-01 | 東京エレクトロン株式会社 | 処理方法及び処理システム |
| JP2023143077A (ja) * | 2022-03-25 | 2023-10-06 | 東京エレクトロン株式会社 | 処理方法及び処理システム |
| JP7742328B2 (ja) | 2022-03-25 | 2025-09-19 | 東京エレクトロン株式会社 | 処理方法及び処理システム |
| WO2024142947A1 (ja) * | 2022-12-26 | 2024-07-04 | 東京エレクトロン株式会社 | 重合基板、基板処理方法及び基板処理システム |
| KR20250129030A (ko) | 2022-12-26 | 2025-08-28 | 도쿄엘렉트론가부시키가이샤 | 중합 기판, 기판 처리 방법 및 기판 처리 시스템 |
| WO2024247740A1 (ja) * | 2023-05-30 | 2024-12-05 | 東京エレクトロン株式会社 | 基板処理方法及び基板処理システム |
Also Published As
| Publication number | Publication date |
|---|---|
| TW202138096A (zh) | 2021-10-16 |
| US12381085B2 (en) | 2025-08-05 |
| CN115335968A (zh) | 2022-11-11 |
| TWI896595B (zh) | 2025-09-11 |
| KR20220156947A (ko) | 2022-11-28 |
| JP7354420B2 (ja) | 2023-10-02 |
| US20230178374A1 (en) | 2023-06-08 |
| JP2023171405A (ja) | 2023-12-01 |
| JPWO2021199585A1 (ja) | 2021-10-07 |
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