WO2022153895A1 - 基板処理装置及び基板処理方法 - Google Patents
基板処理装置及び基板処理方法 Download PDFInfo
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- WO2022153895A1 WO2022153895A1 PCT/JP2022/000100 JP2022000100W WO2022153895A1 WO 2022153895 A1 WO2022153895 A1 WO 2022153895A1 JP 2022000100 W JP2022000100 W JP 2022000100W WO 2022153895 A1 WO2022153895 A1 WO 2022153895A1
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- 239000000758 substrate Substances 0.000 title claims abstract description 127
- 238000003672 processing method Methods 0.000 title claims description 10
- 230000007246 mechanism Effects 0.000 claims abstract description 20
- 238000010030 laminating Methods 0.000 claims abstract description 3
- 230000002093 peripheral effect Effects 0.000 claims description 68
- 238000010521 absorption reaction Methods 0.000 claims description 44
- 230000004048 modification Effects 0.000 claims description 32
- 238000012986 modification Methods 0.000 claims description 32
- 238000006116 polymerization reaction Methods 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 14
- 230000001678 irradiating effect Effects 0.000 claims description 11
- 230000001737 promoting effect Effects 0.000 claims description 9
- 229910052721 tungsten Inorganic materials 0.000 claims description 4
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 3
- 239000010937 tungsten Substances 0.000 claims description 3
- 239000000853 adhesive Substances 0.000 abstract description 3
- 230000001070 adhesive effect Effects 0.000 abstract description 3
- 235000012431 wafers Nutrition 0.000 description 257
- 229910052751 metal Inorganic materials 0.000 description 21
- 239000002184 metal Substances 0.000 description 21
- 239000003607 modifier Substances 0.000 description 18
- 238000004140 cleaning Methods 0.000 description 11
- 238000009966 trimming Methods 0.000 description 9
- 230000007704 transition Effects 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 229910004298 SiO 2 Inorganic materials 0.000 description 3
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000002407 reforming Methods 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 238000013467 fragmentation Methods 0.000 description 2
- 238000006062 fragmentation reaction Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 1
- 230000003028 elevating effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229920000307 polymer substrate Polymers 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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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
-
- 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
-
- 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
-
- 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
-
- 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
- H01L21/185—Joining of semiconductor bodies for junction formation
-
- 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
Definitions
- This disclosure relates to a substrate processing apparatus and a substrate processing method.
- Patent Document 1 in a polymerized substrate in which a first substrate and a second substrate are joined, the inside of the first substrate is modified along the boundary between the peripheral portion and the central portion of the first substrate to be removed.
- a substrate processing system including a modified layer forming apparatus for forming a layer and a peripheral edge removing apparatus for removing a peripheral edge portion of a first substrate using the modified layer as a base point is disclosed. Further, in Patent Document 1, a modified surface is formed inside the device layer formed on the non-processed surface of the first substrate, and the first substrate and the second substrate are formed at the peripheral edge of the first substrate. It is described to reduce the bonding force.
- the technique according to the present disclosure appropriately peels off the first substrate from the second substrate in a polymerized substrate in which the first substrate and the second substrate are joined.
- One aspect of the present disclosure is a substrate processing apparatus for processing a polymer substrate formed by laminating a first substrate, at least an interface layer including a laser absorbing film, and a second substrate, and holds the polymerized substrate.
- An interface laser irradiation unit and a control unit that controls the movement mechanism are provided, and the control unit acquires information on the interface layer formed on the polymerization substrate and is based on the acquired information on the interface layer. Therefore, the interface having the weakest adhesion among the bonding interfaces in the interface layer is set as the peeling interface between the first substrate and the second substrate.
- the first substrate in a polymerized substrate in which a first substrate and a second substrate are bonded, the first substrate can be appropriately peeled from the second substrate.
- a first wafer In the manufacturing process of a semiconductor device, in a polymerization substrate in which a first substrate (silicon substrate such as a semiconductor) in which devices such as a plurality of electronic circuits are formed on the surface and a second substrate are bonded, a first wafer is used. Removal of the peripheral edge, so-called edge trimming, may be performed.
- the edge trim of the first substrate is performed using, for example, the substrate processing system disclosed in Patent Document 1. That is, a modified layer is formed by irradiating the inside of the first substrate with a laser beam, and the peripheral portion is removed from the first substrate with the modified layer as a base point. Further, according to the substrate processing system described in Patent Document 1, a modified surface is formed by irradiating the interface where the first substrate and the second substrate are joined with laser light, and the first substrate at the peripheral edge is formed. The bonding force between the substrate and the second substrate is reduced.
- the interface between the first substrate and the second substrate is formed by irradiating the laser absorption layer (for example, an oxide film) formed between the first substrate and the second substrate with laser light. May cause peeling.
- the laser absorption layer is irradiated with the laser beam to perform edge trimming of the first substrate in this way, if the thickness of the laser absorption layer is small, the energy absorbed and stored in the absorption layer by the irradiation of the laser beam. Since the amount is small, there is a risk that the edge trim of the first substrate cannot be properly performed.
- the technique according to the present disclosure has been made in view of the above circumstances, and in a polymerized substrate in which a first substrate and a second substrate are bonded, the first substrate is appropriately peeled from the second substrate.
- the substrate processing system and the substrate processing method as the substrate processing apparatus 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 surface on the side to be joined to the second wafer S is referred to as a front surface Wa
- the surface opposite to the front surface Wa is referred to as a back surface Wb.
- the surface on the side to be joined to the first wafer W is referred to as the front surface Sa
- the surface opposite to the front surface Sa is referred to as the back surface Sb.
- the first wafer W is a semiconductor wafer such as a silicon substrate, and a device layer (not shown) including a plurality of devices is formed on the surface Wa side.
- a laser absorbing film Fw as a laser absorbing film, a metal film Fm as a peeling promoting film, and a surface film Fe are further laminated on the surface Wa side of the first wafer W, and the surface film Fe is a second surface film Fe. It is bonded to the surface film Fs of the wafer S.
- the laser absorption film Fw a film capable of absorbing laser light from the laser irradiation system 110 described later, such as an oxide film (SiO 2 film, TEOS film), is used.
- the metal film Fm a film such as a tungsten film whose adhesion to the surface film Fe is at least weaker than the adhesion between the first wafer W and the laser absorption film Fw is used.
- the peripheral edge portion We of the first wafer W is a portion to be 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 W.
- the surface film Fe for example, an oxide film (THOX film, SiO 2 film, TEOS film), a SiC film, a SiCN film, an adhesive, or the like is used.
- the second wafer S is, for example, a wafer that supports the first wafer W.
- Surface films Fs are formed on the surface Sa of the second wafer S.
- the surface film Fs include an oxide film (THOX film, SiO 2 film, TEOS film), a SiC film, a SiCN film, and an adhesive.
- the second wafer S functions as a protective material (support wafer) for protecting the device layer D of the first wafer W.
- the second wafer S does not have to be a support wafer, and may be a device wafer on which a device layer (not shown) is formed like the first wafer W.
- the above laser absorption film Fw, metal film Fm, surface film Fe and surface film Fs correspond to the "interface layer" according to the technique of the present disclosure.
- the laser absorption film Fw, the metal film Fm, the surface film Fe, and the surface film Fs are laminated on the interface between the first wafer W and the second wafer S shown in FIG. 1A.
- the configuration of the polymerized wafer T processed by the wafer processing system 1 is not limited to this.
- polymerization in which a surface film Fm2 as a second peeling promoting film is further formed at an interface between the surface Wa of the first wafer W and the laser absorbing film Fw. Wafer T2 may be processed.
- a film for example, a SiN film having a first wafer W adhesion to the surface Wa of at least smaller than the laser absorption film Fw and capable of transmitting laser light from the laser irradiation system 110 described later is used. Can be used. At this time, the adhesion between the metal film Fm and the surface film Fe is smaller than the adhesion between the surface Wa of the first wafer W and the surface film Fm2.
- the wafer processing system 1 has a configuration in which the loading / unloading station 2 and the processing station 3 are integrally connected.
- a cassette C capable of accommodating a plurality of polymerized wafers T is loaded / unloaded from the outside.
- the processing station 3 is provided with various processing devices that perform desired processing on the polymerized wafer T.
- the loading / unloading station 2 is provided with a cassette mounting stand 10 on which a cassette C capable of accommodating a plurality of polymerization wafers T is mounted. Further, on the X-axis positive direction side of the cassette mounting table 10, a wafer transfer device 20 is provided adjacent to the cassette mounting table 10. The wafer transfer device 20 is configured to move on a transfer path 21 extending in the Y-axis direction and transfer the polymerized wafer T between the cassette C of the cassette mounting table 10 and the transition device 30 described later.
- the carry-in / out station 2 is provided with a transition device 30 for delivering the polymerized wafer T to and from the processing station 3 adjacent to the wafer transfer device 20 on the X-axis positive direction side of the wafer transfer device 20. ing.
- the processing station 3 includes a wafer transfer device 40, a peripheral edge removing device 50 as a peripheral edge removing section, a cleaning device 60, an interface reforming device 70 as an interface laser irradiation section, and an internal reforming device as an internal laser irradiation section. 80 is arranged.
- the wafer transfer device 40 is provided on the X-axis positive direction side of the transition device 30.
- the wafer transfer device 40 is configured to be movable on a transfer path 41 extending in the X-axis direction, and is a transition device 30, a peripheral edge removing device 50, a cleaning device 60, an interface modification device 70, and an internal modification of the loading / unloading station 2.
- the polymerized wafer T can be conveyed to the quality apparatus 80.
- the peripheral edge removing device 50 removes the peripheral edge portion We of the first wafer W, that is, performs edge trimming.
- the cleaning device 60 performs a cleaning process on the exposed surface of the second wafer S after edge trimming to remove particles on the exposed surface.
- the interface modifier 70 irradiates the interface between the first wafer W and the second wafer S with laser light (interface laser light, for example, a CO 2 laser) to form an unbonded region Ae described later.
- laser light interface laser light, for example, a CO 2 laser
- the internal reformer 80 irradiates the inside of the first wafer W with a laser beam (internal laser beam, for example, a YAG laser), and the peripheral edge modifying layer M1 serving as a base point for peeling the peripheral edge We, and the peripheral edge We.
- a laser beam internal laser beam, for example, a YAG laser
- the split modified layer M2 which is the base point for the fragmentation of the above, is formed.
- the above wafer processing system 1 is provided with a control device 90 as a control unit.
- the control device 90 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 90 from the storage medium H.
- the interface modifier 70 has a chuck 100 as a substrate holding portion that holds the polymerized wafer T on the upper surface.
- the chuck 100 attracts and holds the back surface Sb of the second wafer S.
- the chuck 100 is supported by the slider table 102 via the air bearing 101.
- a rotation mechanism 103 is provided on the lower surface side of the slider table 102.
- the rotation mechanism 103 has, for example, a built-in motor as a drive source.
- the chuck 100 is rotatably configured around the ⁇ axis (vertical axis) by the rotation mechanism 103 via the air bearing 101.
- the slider table 102 is configured to be movable along a rail 105 extending in the Y-axis direction by a horizontal movement mechanism 104 provided on the lower surface side thereof.
- the rail 105 is provided on the base 106.
- the drive source of the horizontal movement mechanism 104 is not particularly limited, but for example, a linear motor is used.
- the rotation mechanism 103 and the horizontal movement mechanism 104 described above correspond to the "movement mechanism" according to the technique of the present disclosure.
- a laser irradiation system 110 is provided above the chuck 100.
- the laser irradiation system 110 includes a laser head 111 and a lens 112.
- the lens 112 may be configured to be able to move up and down by an elevating mechanism (not shown).
- the laser head 111 has a laser oscillator (not shown) that oscillates laser light in a pulsed manner. That is, the laser light emitted from the laser irradiation system 110 to the polymerized wafer T held by the chuck 100 is a so-called pulse laser, and its power repeats 0 (zero) and the maximum value. Further, in the present embodiment, the laser light is CO 2 laser light, and the wavelength of the CO 2 laser light is, for example, 8.9 ⁇ m to 11 ⁇ m.
- the laser head 111 may have other equipment such as a laser oscillator, for example, an amplifier.
- the lens 112 is a tubular member, and irradiates the polymerized wafer T held by the chuck 100 with laser light.
- the laser light emitted from the laser irradiation system 110 passes through the first wafer W, is irradiated to the laser absorption film Fw, and is absorbed.
- the wafer processing performed by using the wafer processing system 1 configured as described above will be described.
- the case where the peripheral edge portion We of the first wafer W is peeled off from the second wafer S (so-called edge trim) in the wafer processing system 1 will be described as an example.
- the first wafer W and the second wafer S 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 a plurality of the polymerization wafers T is placed on the cassette mounting table 11 of the loading / unloading station 2.
- the polymerized wafer T in the cassette C is taken out by the wafer transfer device 20, and is transferred to the internal reformer 80 via the transition device 30.
- the internal reformer 80 as shown in FIG. 4A, the inside of the first wafer W is irradiated with laser light to form the peripheral modifier layer M1 and the split modifier layer M2.
- 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 polymerized wafer T in which the peripheral modification layer M1 and the split modification layer M2 are formed inside the first wafer W is then transferred to the interface modification device 70 by the wafer transfer device 40.
- the interface modifier 70 the interface between the first wafer W and the second wafer S on the peripheral edge We (more concretely) while rotating the polymerized wafer T (first wafer W) and moving it in the Y-axis direction.
- the above-mentioned laser absorption film Fw) formed at the interface is irradiated with laser light in a pulsed manner. As a result, as shown in FIG. 4B, peeling occurs at the interface between the first wafer W and the second wafer S.
- the bonding strength between the first wafer W and the second wafer S has not been lowered due to the peeling at the interface between the first wafer W and the second wafer S in this way.
- a junction region Ae is formed.
- an annular unjoined region Ae and the first wafer W and the first wafer W and the first wafer W and the first wafer W are located inside the unbonded region Ae in the radial direction.
- a bonding region Ac in which the two wafers S are bonded is formed.
- the peripheral edge portion We of the first wafer W to be removed is removed, and the presence of the unjoined region Ae in this way appropriately removes the peripheral edge portion We. Can be done.
- the polymerized wafer T on which the unbonded region Ae is formed is then transferred to the peripheral edge removing device 50 by the wafer transfer device 40.
- the peripheral edge removing device 50 as shown in FIG. 4C, the peripheral edge portion We of the first wafer W is removed, that is, edge trimming is performed.
- the peripheral edge portion We is peeled off from the central portion of the first wafer W with the peripheral edge modifying layer M1 as the base point, and is completely peeled off from the second wafer S with the unbonded region Ae as the base point.
- the peripheral portion We to be removed is fragmented with the split reforming layer M2 as a base point.
- a blade having a wedge shape may be inserted at the interface between the first wafer W and the second wafer S 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 W, the peripheral edge portion We is peeled off from the peripheral edge modifying layer M1 as a base point. Further, as described above, since the unbonded region Ae reduces the bonding strength between the first wafer W and the second wafer S, the peripheral edge portion We is appropriately removed from the second wafer S.
- the polymerized wafer T from which the peripheral portion We of the first wafer W has been removed is then transported to the cleaning device 60 by the wafer transfer device 40.
- the peripheral edge portion of the second wafer S after the peripheral edge portion We has been removed (hereinafter, may be referred to as an “exposed surface” after edge trimming). To be washed.
- the exposed surface of the second wafer S is irradiated with a laser beam for cleaning (for example, a CO 2 laser) to modify and remove the surface of the exposed surface, whereby the exposed surface is exposed to the exposed surface. Residual particles and the like may be removed (washed).
- the exposed surface may be spin-cleaned by supplying the cleaning liquid to the exposed surface of the second wafer S while rotating the polymerized wafer T.
- the back surface Sb of the second wafer S may be further cleaned together with the cleaning of the exposed surface of the second wafer S.
- the polymerized wafer T that has been subjected to all the processing 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 interface modification device 70 As shown in FIGS. 4 (a) and 4 (b), after the peripheral modification layer M1 and the split modification layer M2 are formed by the internal modification device 80, the interface modification device 70
- the order of wafer processing in the wafer processing system 1 is not limited to this. That is, after the unjoined region Ae is formed by the interface modification device 70, the peripheral modification layer M1 and the division modification layer M2 may be formed by the internal modification device 80.
- the laser irradiation system 110 irradiates the laser absorption film Fw formed at the interface between the first wafer W and the second wafer S with laser light.
- the irradiated laser light is absorbed by the laser absorption film Fw.
- the temperature of the laser absorption film Fw rises and expands by accumulating energy by absorbing the laser beam.
- the interface between the first wafer W and the laser absorption film Fw due to the expansion of the laser absorption film Fw (in the polymerized wafer T2 shown in FIG. 1B, the interface between the first wafer W and the surface film Fm2 having a small adhesion force).
- a shear stress is generated in the surface, which causes peeling at the interface between the first wafer W and the laser absorbing film Fw (surface film Fm2). That is, at the laser beam irradiation position, an unbonded region Ae in which the bonding force between the first wafer W and the second wafer S is reduced due to peeling is formed.
- the unbonded region Ae is usually formed at the interface between the laser absorption film Fw (surface film Fm2) and the first wafer W, but as described above, the laser absorption film Fw If the thickness of the laser is small, the throughput applied to the edge trim of the first wafer W may decrease. Specifically, the amount of energy absorbed and stored in the laser absorbing film Fw is reduced, and the amount of expansion of the laser absorbing film Fw due to the absorption of laser light is reduced.
- the first wafer W and the laser absorbing film Fw (The shear stress generated at the interface of the surface film Fm2) becomes small, and as a result, the interface between the first wafer W and the laser absorption film Fw (surface film Fm2) cannot be properly peeled off, and the unbonded region Ae cannot be properly formed. There is a risk.
- a metal film Fm as a peeling promoting film is formed at the interface between the first wafer W and the second wafer S.
- a film in which at least the adhesion between the metal film Fm and the surface film Fe is weaker than the adhesion between the first wafer W and the laser absorbing film Fw (surface film Fm2) is used.
- a metal film Fm and a surface film Fe having a lower adhesion than the first wafer W and the laser absorbing film Fw An interface with is formed at the interface between the first wafer W and the second wafer S.
- the peripheral portion We is peeled off at the interface between the metal film Fm and the surface film Fe, so that the interface between the first wafer W and the laser absorbing film Fw (surface film Fm2) is peeled off (not yet).
- the throughput in the interface modifier 70 can be appropriately improved.
- the pulse pitch P which is the irradiation interval of the laser light in the circumferential direction
- the index pitch Q which is the irradiation interval of the laser light in the radial direction
- the irradiation interval at which the peeling occurs at the A interface is referred to as the “A interface peeling pitch”
- the irradiation interval at which the peeling occurs at the B interface is referred to as the “B interface peeling pitch”.
- the present inventors have set the laser beam irradiation interval (hereinafter, referred to as “conversion pitch Pq”) at which the peeling surface positions of the first wafer W and the second wafer S are switched between the A interface and the B interface with a laser. It was found that it changes depending on the thickness of the absorption film Fw. Specifically, as shown in FIG. 7, it was found that the conversion pitch Pq increases as the thickness of the laser absorption film Fw increases.
- Information on the adhesion of various interfaces is output to the control device 90 (step E0-1 in FIG. 8).
- a table showing the correlation between the adhesion of various interfaces shown in FIG. 6 and the irradiation interval (pulse energy) of the laser beam required for peeling the interface is prepared in advance (step E0-2 in FIG. 8). ..
- the unbonded region Ae is formed at the interface between the first wafer W and the second wafer S as layer information of the polymerized wafer T to be formed.
- Information on the type of the polymerized film and information on the thickness of the laser absorbing film Fw are acquired (step E1 in FIG. 8).
- the acquired layer information of the polymerized wafer T is output to the control device 90.
- the layer information of the polymerized wafer T may be acquired by the interface modification device 70, or may be acquired in advance outside the interface modification device 70.
- the layer information of the polymerized wafer T to be acquired is not limited to information on the type of film and information on the thickness of the laser absorbing film Fw.
- the tendency of the surface shape of the second wafer S (for example, convex shape, concave shape, etc.) may be acquired.
- the interface of various films formed at the interface between the first wafer W and the second wafer S (in the above embodiment).
- the interface with the weakest adhesion (the B interface in the above embodiment), which is the peeling interface, from the A interface or the B interface and the interface between the laser absorption film Fw and the metal film Fm (step of FIG. 8).
- the adhesion force at the interface of various films can be obtained, for example, by comparing the information output to the control device 90 in step E0-1.
- the irradiation interval (pulse pitch P and index pitch Q) of the laser light irradiated from the laser irradiation system 110 to the laser absorption film Fw is then determined (step in FIG. 8). E3). Specifically, the correlation between the thickness of the laser absorbing film Fw acquired in step E1 and the adhesion between various interfaces acquired in step E0-2 and the irradiation interval of laser light required for peeling the interface (Fig.). 6), the irradiation interval of the laser beam is determined within the irradiation interval (B interface peeling pitch in the above embodiment) in which the unbonded region Ae can be selected at the selected interface.
- the laser absorption film Fw of the polymerized wafer T held by the chuck 100 is irradiated with the laser light so as to have the determined irradiation interval (step E4 in FIG. 8). .. Specifically, the frequency of the laser beam and the rotation speed of the chuck 100 (polymerized wafer T) are controlled so that the laser beam is irradiated at the determined pulse pitch P, and the laser beam is emitted at the determined index pitch Q. The moving speed of the chuck 100 (polymerized wafer T) in the Y-axis direction is controlled so as to be irradiated.
- a laser is applied to the laser absorbing film Fw formed at the interface between the first wafer W and the second wafer S.
- the bonding force at the interface between the first wafer W and the second wafer S is reduced.
- a metal film Fm whose adhesion to the surface film Fe is weaker than the adhesion between the first wafer W and the laser absorption film Fw is formed.
- the peripheral edge portion We can be appropriately peeled off at the interface B.
- the edge trim of the first wafer W can be performed with substantially constant pulse energy regardless of the thickness of the laser absorption film Fw formed at the interface of the polymerized wafer T.
- the thickness of the laser absorption film Fw is small, the volume of absorbing pulse energy becomes large. Since it is small and the energy absorption efficiency is small, the pulse energy required for peeling is large. In other words, the energy control related to the peeling of the first wafer W (formation of the unbonded region Ae) becomes complicated, and there is room for improvement from the viewpoint of energy efficiency.
- the pulse energy is substantially constant regardless of the thickness of the laser absorption film Fw.
- the first wafer W can be peeled off (unbonded region Ae is formed).
- the first wafer W can be peeled off (unbonded region Ae is formed) with good energy efficiency and simple control.
- the peeling surface position of the first wafer W becomes the A interface when the conversion pitch is Pq or less, and becomes the B interface when the conversion pitch is larger than Pq.
- the irradiation interval of the laser beam for the purpose of peeling the first wafer W at the B interface can be arbitrarily selected as long as it is within the above-mentioned B interface peeling pitch.
- the throughput in the interface modifier 70 is appropriate by irradiating the laser beam at an arbitrary irradiation interval within the B interface peeling pitch.
- the throughput in the interface reformer 70 can be maximized.
- the laser processing time in the interface modifying device 70 can be adjusted to the laser processing time required by the wafer processing system 1.
- the tact can be easily matched with other processing devices.
- the wafer processing can be optimized for the entire wafer processing system 1, that is, the overall throughput of the wafer processing system 1 can be improved.
- the irradiation interval of the laser light on the laser absorbing film Fw is determined based on the thickness of the laser absorbing film Fw formed at the interface of the polymerized wafer T in this way.
- the thickness of the laser absorbing film Fw is determined according to the irradiation interval, and the polymerized wafer T is determined. May be formed.
- the laser absorbing film Fw at a position corresponding to the peripheral portion We is irradiated with laser light.
- the wafer processing performed in the wafer processing system 1 is not limited to the edge trim.
- an internal surface modification layer M3 which is a base point for thinning of the first wafer W, is formed inside the first wafer W, and at that time, the peripheral portion We is first formed.
- the technique according to the present disclosure can be applied even when the wafer W is removed integrally with the back surface Wb side.
- the interface modification device 70 further corresponds to the peripheral portion We.
- An unjoined region Ae is formed at the position where the joint is formed.
- the first wafer W is thinned with the internal surface modification layer M3 as the base point, and the peripheral edge portion We with the peripheral modification layer M1 and the unbonded region Ae as the base points. Is peeled off and removed.
- the metal film f is formed at the interface between the first wafer W and the second wafer S, and the irradiation interval of the laser light on the laser absorption film Fw is controlled.
- the position of the peeling surface of the peripheral edge We can be appropriately selected from the A interface or the B interface. In other words, the first wafer W can be appropriately peeled from the second wafer S regardless of the thickness of the laser absorption film Fw.
- the entire surface of the first wafer W is peeled off from the second wafer S, and a device layer (not shown) formed on the surface Wa side of the first wafer W is formed on the second wafer S.
- the technique according to the present disclosure can be applied even in the case of transferring and performing so-called laser lift-off.
- the interface modifier 70 irradiates the laser absorption film Fw on the entire surface of the polymerized wafer T with laser light to form an unbonded region Ae.
- the bonding force between the first wafer W and the second wafer S is reduced on the entire surface of the polymerized wafer T, and as shown in FIG. 11B, the first wafer W is appropriately replaced with the second wafer S. Can be peeled off from.
- the metal film f is formed at the interface between the first wafer W and the second wafer S as described above, and the irradiation interval of the laser light on the laser absorbing film Fw is controlled. Then, the position of the peeling surface of the first wafer W can be appropriately selected from the A interface or the B interface. In other words, the first wafer W can be appropriately peeled from the second wafer S regardless of the thickness of the laser absorption film Fw.
- the peeling promoting film formed at the interface between the first wafer W and the second wafer S is a metal film Fm (for example, a tungsten film) has been described as an example.
- the type of peeling promoting film is not limited to this. Specifically, at least the adhesion between the surface film Fe (or the laser absorption film Fw) is different from the adhesion between the first wafer W and the laser absorption film Fw, and the adhesion to the laser absorption film Fw is different. Anything can be used as long as the position of the peeling surface can be selected when irradiating the laser beam.
- the formation position of the peeling promoting film is not limited to the example shown in FIG. 1, that is, between the laser absorbing film Fw and the surface film Fe.
- the surface Wa of the first wafer W and the laser absorbing film are not limited. It may be formed between Fw.
- the peeling promoting film needs to have transparency to the laser light from the laser irradiation system 110.
- the peripheral modification layer M1 and the division modification layer M2 are formed inside the first wafer W
- the first wafer W and the second wafer W are used.
- the unbonded region Ae is formed at the interface with the wafer S
- the order of wafer processing in the wafer processing system 1 is not limited to this. That is, after forming the unbonded region Ae at the interface between the first wafer W and the second wafer S as described above, the peripheral modification layer M1 and the split modification layer M2 are formed inside the first wafer W. It may be formed.
- the unbonded region Ae is similarly formed at the interface between the first wafer W and the second wafer S.
- the peripheral modification layer M1 and the internal surface modification layer M3 may be formed inside the first wafer W.
- Wafer processing system 70 Interface reformer 90 Control device 100
- Chuck 103 Rotation mechanism 104 Horizontal movement mechanism Fw Laser absorption film P Pulse pitch Q Index pitch S Second wafer T Polymerized wafer W First wafer
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Abstract
Description
例えばウェハ処理システム1においては、図1Bに示すように、第1のウェハWの表面Waとレーザ吸収膜Fwとの界面に、第2の剥離促進膜としての表面膜Fm2が更に形成された重合ウェハT2が処理されてもよい。表面膜Fm2としては、第1のウェハWの表面Waとの密着力が少なくともレーザ吸収膜Fwよりも小さく、且つ、後述のレーザ照射システム110からのレーザ光を透過できる膜(例えばSiN膜)を用いることができる。またこの時、金属膜Fmと表面膜Feとの密着力は、第1のウェハWの表面Waと表面膜Fm2との密着力よりも小さい。
また洗浄装置60では、第2のウェハSの露出面の洗浄と共に、第2のウェハSの裏面Sbが更に洗浄されてもよい。
これにより、当該金属膜Fmと表面膜Feとの界面で周縁部Weの剥離を行うことで、従来のように第1のウェハWとレーザ吸収膜Fw(表面膜Fm2)の界面を剥離(未接合領域Aeを形成)する場合と比較して、界面改質装置70におけるスループットを適切に向上できる。
また、図6に示した、各種界面の密着力と、当該界面の剥離に必要なレーザ光の照射間隔(パルスエネルギー)との相関を示す表を予め作成する(図8のステップE0-2)。
重合ウェハTの層情報は、界面改質装置70で取得してもよいし、界面改質装置70の外部で予め取得されたものであってもよい。
具体的には、ステップE1で取得されたレーザ吸収膜Fwの厚みと、ステップE0-2で取得された各種界面の密着力と当該界面の剥離に必要なレーザ光の照射間隔との相関(図6を参照)に基づいて、選択された界面で未接合領域Aeを選択することができる照射間隔(上記実施形態においてはB界面剥離ピッチ)の内で、レーザ光の照射間隔を決定する。
具体的には、図9の比較例に示すように、界面に金属膜Fmが形成されていない従来の重合ウェハTにおいては、レーザ吸収膜Fwの厚みが小さいと、パルスエネルギーを吸収する体積が小さくエネルギーの吸収効率が小さいため、剥離に必要なパルスエネルギーは大きくなる。換言すれば、第1のウェハWの剥離(未接合領域Aeの形成)に係るエネルギー制御が煩雑になるとともに、エネルギー効率の観点で改善の余地があった。
この点、界面に金属膜Fmが形成された本実施形態にかかる重合ウェハT、T2によれば、図9に示したように、レーザ吸収膜Fwの厚みに依らずに略一定のパルスエネルギーで第1のウェハWを剥離(未接合領域Aeを形成)できる。換言すれば、本実施形態によれば、エネルギー効率がよく、かつ簡易な制御で第1のウェハWを剥離(未接合領域Aeを形成)できる。
具体的には、例えばB界面剥離ピッチの内における最も広い照射間隔でレーザ光の照射を行うことで、界面改質装置70におけるスループットを最大限に向上できる。
また例えば、B界面剥離ピッチの内における任意の照射間隔でレーザ光の照射を行うことで、界面改質装置70におけるレーザ処理時間を、ウェハ処理システム1で要求されるレーザ処理時間に調整でき、これにより他の処理装置との間において容易にタクトを合わせることができる。換言すれば、ウェハ処理システム1の全体においてウェハ処理を最適化することができ、すなわちウェハ処理システム1の全体におけるスループットを向上できる。
具体的には、少なくとも表面膜Fe(又はレーザ吸収膜Fw)との間の密着力が第1のウェハWとレーザ吸収膜Fwとの密着力とは異なるものであり、レーザ吸収膜Fwへのレーザ光の照射に際して剥離面の位置を選択し得るものであればよい。
70 界面改質装置
90 制御装置
100 チャック
103 回転機構
104 水平移動機構
Fw レーザ吸収膜
P パルスピッチ
Q インデックスピッチ
S 第2のウェハ
T 重合ウェハ
W 第1のウェハ
Claims (15)
- 第1の基板、少なくともレーザ吸収膜を含む界面層、及び第2の基板が積層して形成された重合基板を処理する基板処理装置であって、
前記重合基板を保持する基板保持部と、
前記レーザ吸収膜に対してレーザ光をパルス状に照射する界面用レーザ照射部と、
前記基板保持部と前記界面用レーザ照射部を相対的に移動させる移動機構と、
前記界面用レーザ照射部と前記移動機構を制御する制御部と、を備え、
前記制御部は、
前記重合基板に形成された前記界面層の情報を取得する制御と、
取得された前記界面層の情報に基づいて、前記界面層における接合界面のうち最も密着力の弱い界面を、前記第1の基板と前記第2の基板の剥離界面として設定する制御を実行する、基板処理装置。 - 前記制御部は、
設定された前記剥離界面に応じて、前記レーザ吸収膜に照射される前記レーザ光の間隔を決定する制御を実行する、請求項1に記載の基板処理装置。 - 前記移動機構は、
前記基板保持部と前記界面用レーザ照射部を相対的に回転させる回転機構と、
前記基板保持部と前記界面用レーザ照射部を相対的に水平方向に移動させる水平移動機構と、を備え、
前記制御部は、前記レーザ光の間隔として周方向間隔と径方向間隔を設定する制御を実行する、請求項2に記載の基板処理装置。 - 前記制御部は、前記レーザ吸収膜の厚みに基づいて、前記重合基板へのレーザ処理時間が最小になるように、前記レーザ光の間隔を設定する制御を実行する、請求項2又は3に記載の基板処理装置。
- 前記制御部は、前記レーザ吸収膜の厚みに基づいて、前記重合基板へのレーザ処理時間が前記基板処理装置に要求されるレーザ処理時間となるように、前記レーザ光の間隔を設定する制御を実行する、請求項2又は3に記載の基板処理装置。
- 前記第1の基板の内部にレーザ光を照射して、前記第1の基板の剥離の起点となる改質層を形成する内部用レーザ照射部を備える、請求項1~5のいずれか一項に記載の基板処理装置。
- 除去対象である前記第1の基板の周縁部を除去する周縁除去部を備え、
前記内部用レーザ照射部は、除去対象である前記第1の基板の周縁部の剥離の起点となる周縁改質層を形成する、請求項6に記載の基板処理装置。 - 前記界面層は、前記レーザ吸収膜と前記第2の基板の界面に形成された剥離促進膜を含み、
前記剥離促進膜がタングステン膜である、請求項1~7のいずれか一項に記載の基板処理装置。 - 第1の基板、少なくともレーザ吸収膜を含む界面層、及び第2の基板が接合された重合基板を処理する基板処理方法であって、
前記重合基板に形成された前記界面層の情報を取得することと、
取得された前記界面層の情報に基づいて、前記界面層の接合界面のうち最も密着力の弱い界面を、前記第1の基板と前記第2の基板の剥離界面として設定することと、
設定された前記剥離界面に応じて、前記レーザ吸収膜に照射されるレーザ光の間隔を決定することと、を含む、基板処理方法。 - 決定された前記レーザ光の間隔となるように、前記レーザ吸収膜に対してレーザ光をパルス状に照射することを含む、請求項9に記載の基板処理方法。
- 前記レーザ光の間隔は周方向間隔と径方向間隔を含み、
前記周方向間隔になるように、前記重合基板と前記レーザ光の照射部を相対的に回転させるとともに、
前記径方向間隔になるように、前記重合基板と前記レーザ光の照射部を相対的に水平方向に移動させながら、前記照射部から前記レーザ吸収膜に前記レーザ光を照射する、請求項10に記載の基板処理方法。 - 前記レーザ吸収膜の厚みに基づいて、前記重合基板へのレーザ処理時間が最小になるように、前記レーザ光の間隔を設定する、請求項10又は11に記載の基板処理方法。
- 前記レーザ吸収膜の厚みに基づいて、前記重合基板へのレーザ処理時間が要求されるレーザ処理時間となるように、前記レーザ光の間隔を設定する、請求項10又は11に記載の基板処理方法。
- 前記第1の基板の内部にレーザ光を照射して、前記第1の基板の剥離の起点となる改質層を形成することを含む、請求項9~13のいずれか一項に記載の基板処理方法。
- 除去対象である前記第1の基板の周縁部を除去することを含み、
前記第1の基板の内部に形成される前記改質層は、除去対象である前記第1の基板の周縁部の剥離の起点となる周縁改質層を含む、請求項14に記載の基板処理方法。
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