WO2022239570A1 - 支持ステージ、支持装置及び半導体装置の製造方法 - Google Patents
支持ステージ、支持装置及び半導体装置の製造方法 Download PDFInfo
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- WO2022239570A1 WO2022239570A1 PCT/JP2022/016525 JP2022016525W WO2022239570A1 WO 2022239570 A1 WO2022239570 A1 WO 2022239570A1 JP 2022016525 W JP2022016525 W JP 2022016525W WO 2022239570 A1 WO2022239570 A1 WO 2022239570A1
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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
- H01L21/67—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
- H01L21/683—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 for supporting or gripping
- H01L21/6838—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 for supporting or gripping with gripping and holding devices using a vacuum; Bernoulli devices
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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
- H01L21/0445—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 crystalline silicon carbide
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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
- H01L21/30—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
- H01L21/67017—Apparatus for fluid treatment
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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
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- 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
- H01L21/67242—Apparatus for monitoring, sorting or marking
- H01L21/67288—Monitoring of warpage, curvature, damage, defects or the like
Definitions
- Patent Literature 1 discloses a support device having a holding portion that holds a wafer and a body portion that is connected to the holding portion so as to face the wafer.
- One embodiment provides a support stage that can correct warpage of a wafer.
- a base portion a support portion that protrudes from the peripheral edge portion of the base portion and contacts one surface of the wafer, and is provided on the support portion to apply a suction force to the one surface.
- a suction groove an ejection hole provided in an inner portion of the base portion for ejecting gas toward the one surface, and provided in at least one of the base portion and the support portion, the base portion and the support portion and an exhaust hole for exhausting gas from the space between said one surface.
- FIG. 1 is a plan view showing one form example of a wafer.
- FIG. 2 is a cross-sectional view taken along line II-II shown in FIG.
- FIG. 3 is a plan view showing a support stage according to the first embodiment;
- FIG. 4 is a cross-sectional view taken along line IV-IV shown in FIG.
- FIG. 5 is a cross-sectional view taken along line V-V shown in FIG.
- FIG. 6 is a schematic diagram showing a form example of the support device.
- FIG. 7 is a flow chart showing an example of a method for manufacturing a semiconductor device.
- FIG. 8A is a schematic diagram for explaining one step of the method for manufacturing a semiconductor device.
- FIG. 8B is a schematic diagram showing a process after FIG. 8A.
- FIG. 8A is a schematic diagram showing a process after FIG. 8A.
- FIG. 8C is a schematic diagram showing a process after FIG. 8B.
- FIG. 8D is a schematic diagram showing a process after FIG. 8C.
- FIG. 8E is a schematic diagram showing a process after FIG. 8D.
- FIG. 8F is a schematic diagram showing a process after FIG. 8E.
- FIG. 8G is a schematic diagram showing a process after FIG. 8F.
- FIG. 8H is a schematic diagram showing a process after FIG. 8G.
- FIG. 8I is a schematic diagram showing a step after FIG. 8H.
- FIG. 8J is a schematic diagram showing the process after FIG. 8I.
- FIG. 9 is a graph showing the processing result of warpage when air pressure control is added.
- FIG. 10 is a graph showing the processing result of warpage when air pressure control is not applied.
- FIG. 11 is a plan view showing a support stage according to the second embodiment.
- FIG. 12 is a plan view showing a support stage according to the third embodiment.
- FIG. 13 is a plan view showing a support stage according to the fourth embodiment;
- FIG. 14 is a plan view showing a support stage according to the fifth embodiment.
- FIG. 15 is a plan view showing a support stage according to the sixth embodiment.
- FIG. 16 is a plan view showing a support stage according to the seventh embodiment.
- FIG. 17 is a plan view showing a support stage according to the eighth embodiment;
- FIG. 18 is a plan view showing a support stage according to the ninth embodiment.
- FIG. 19 is a plan view showing a support stage according to the tenth embodiment.
- FIG. 11 is a plan view showing a support stage according to the second embodiment.
- FIG. 12 is a plan view showing a support stage according to the third embodiment.
- FIG. 13 is a plan view showing a support stage according to the fourth embodiment;
- FIG. 20 is a plan view showing a support stage according to the eleventh embodiment.
- FIG. 21 is a plan view showing a support stage according to the twelfth embodiment.
- 22 is a cross-sectional view taken along line XXII-XXII shown in FIG. 21.
- FIG. 23 is a plan view showing a support stage according to the thirteenth embodiment.
- 24 is a cross-sectional view taken along line XXIV-XXIV shown in FIG. 23.
- FIG. FIG. 25 is a plan view showing a support stage according to the fourteenth embodiment. 26 is a cross-sectional view taken along line XXVI-XXVI shown in FIG. 25.
- FIG. 27 is a cross-sectional view taken along line XXVII-XXVII shown in FIG. 25.
- FIG. 28 is a plan view showing another form example of the wafer shown in FIG. 1.
- FIG. 29 is an enlarged cross-sectional view of the main part of the functional device shown in FIG. 28.
- FIG. 30 is a plan view showing another form example of the supporting device shown in FIG. 6.
- FIG. 31A is a schematic diagram for explaining an example of a process performed on a wafer having a mountain-folded warp.
- FIG. 31B is a schematic diagram showing a step after FIG. 31A.
- FIG. 1 is a plan view showing one form example of a wafer W used for manufacturing a semiconductor device.
- FIG. 2 is a cross-sectional view taken along line II-II shown in FIG. Referring to FIGS. 1 and 2, the wafer W is shaped like a disk in this embodiment.
- the wafer W is made of a high-hardness semiconductor wafer having higher hardness than Si (silicon) single crystal.
- Wafer W is preferably a wide bandgap semiconductor wafer containing a wide bandgap semiconductor.
- a wide bandgap semiconductor is a semiconductor having a bandgap higher than that of a Si single crystal.
- the wafer W is a SiC wafer containing a hexagonal SiC (silicon carbide) single crystal as an example of a wide bandgap semiconductor.
- Hexagonal SiC single crystals have a plurality of polytypes including 2H (Hexagonal)-SiC single crystals, 4H-SiC single crystals, 6H-SiC single crystals and the like.
- This form shows an example in which the wafer W consists of a 4H—SiC single crystal, but other polytypes are not excluded.
- the wafer W has a first principal surface 1 on one side, a second principal surface 2 on the other side, and a side surface 3 connecting the first principal surface 1 and the second principal surface 2 .
- first direction X one direction along the first main surface 1
- second direction Y a direction perpendicular to the first direction X along the first main surface 1
- Z the vertical direction Z.
- the first direction X may be the m-axis direction of the SiC single crystal
- the second direction Y may be the a-axis direction of the SiC single crystal
- the first direction X may be the a-axis direction of the SiC single crystal
- the second direction Y may be the m-axis direction of the SiC single crystal.
- the first main surface 1 and the second main surface 2 face the c-plane of the SiC single crystal. It is preferable that the first main surface 1 faces the silicon surface of the SiC single crystal and the second main surface 2 faces the carbon surface of the SiC single crystal.
- the first main surface 1 and the second main surface 2 may have an off angle inclined at a predetermined angle in a predetermined off direction with respect to the c-plane. That is, the c-axis of the SiC single crystal may be inclined with respect to the vertical direction Z by an off angle.
- the off-direction is preferably the a-axis direction ([11-20] direction) of the SiC single crystal.
- the off angle may exceed 0° and be 10° or less.
- the off angle is preferably 5° or less.
- the off angle is particularly preferably 2° or more and 4.5° or less.
- Wafer W has marks 4 indicating the crystal orientation of the SiC single crystal on side surface 3 .
- the mark 4 includes an orientation flat that is cut linearly in plan view from the vertical direction Z (hereinafter simply referred to as “plan view”).
- the orientation flat extends in the second direction Y in this configuration.
- the orientation flat does not necessarily have to extend in the second direction Y and may extend in the first direction X as well.
- the mark 4 may include a first orientation flat extending in the first direction X and a first orientation flat extending in the second direction Y.
- the wafer W may have a diameter of 50 mm or more and 300 mm or less (that is, 2 inches or more and 12 inches or less) in plan view.
- the diameter of wafer W is defined by the length of a chord passing through the center of wafer W outside of mark 4 .
- the wafer W has a thickness of 50 ⁇ m or more and 1050 ⁇ m or less.
- the wafer W is preferably a thin wafer having a relatively small thickness. In this case, the thickness of the wafer W is preferably 50 ⁇ m or more and 200 ⁇ m or less.
- the wafer W includes an n-type (first conductivity type) first region 5 formed in the surface layer portion of the second main surface 2 .
- the first region 5 is formed in a layered shape extending along the second main surface 2 and exposed from the second main surface 2 and the side surface 3 .
- the first region 5 may have a thickness of 45 ⁇ m or more and 1000 ⁇ m or less.
- the thickness of the first region 5 is preferably 200 ⁇ m or less.
- the first region 5 is made of a semiconductor substrate (specifically, a SiC semiconductor substrate) in this embodiment, and forms part of the second main surface 2 and the side surface 3 .
- Wafer W includes n-type second region 6 formed in the surface layer of first main surface 1 .
- the second region 6 has an n-type impurity concentration lower than that of the first region 5 and is electrically connected to the first region 5 within the wafer W. As shown in FIG.
- the second region 6 is formed in a layer extending along the first principal surface 1 and exposed from the first principal surface 1 and the side surface 3 .
- the second region 6 has a thickness in the vertical direction Z which is less than the thickness of the first region 5 .
- the thickness of the second region 6 may be 5 ⁇ m or more and 50 ⁇ m or less.
- the thickness of the second region 6 is preferably 10 ⁇ m or more and 30 ⁇ m or less.
- Second region 6 consists of an epitaxial layer (specifically, a SiC epitaxial layer) in this embodiment, and forms part of first main surface 1 and side surface 3 . That is, the wafer W has a laminated structure including the SiC semiconductor substrate and the SiC epitaxial layer.
- the wafer W includes a plurality of device regions 7 and a plurality of planned cutting lines 8 provided on the first main surface 1 .
- the plurality of device regions 7 are each set to have a rectangular shape in plan view.
- the plurality of device regions 7 are arranged in a matrix along the first direction X and the second direction Y in plan view. That is, the first direction X is also the first arrangement direction of the plurality of device regions 7 , and the second direction Y is also the second arrangement direction of the plurality of device regions 7 .
- the plurality of device regions 7 are arranged at intervals inwardly from the peripheral portion of the first main surface 1 in plan view. That is, the wafer W has an inner portion having a plurality of device regions 7 and a peripheral portion having no device regions 7 .
- the plurality of planned cutting lines 8 are set in a grid pattern extending along the first direction X and the second direction Y so as to partition the plurality of device regions 7 .
- Wafer W further includes a plurality of functional devices 9 respectively formed in each device region 7 on first main surface 1 .
- Each functional device 9 is formed using a part of the second region 6 with a space inward from the periphery of each device region 7 .
- Each functional device 9 may include at least one of a switching device, a rectifying device and a passive device.
- the switching device may include at least one of MISFET (Metal Insulator Semiconductor Field Effect Transistor), BJT (Bipolar Junction Transistor), IGBT (Insulated Gate Bipolar Junction Transistor) and JFET (Junction Field Effect Transistor).
- the rectifying device may include at least one of a pn junction diode, a pin junction diode, a Zener diode, an SBD (Schottky Barrier Diode) and an FRD (Fast Recovery Diode).
- Passive devices may include at least one of resistors, capacitors and coils.
- Each functional device 9 may include a circuit network (for example, an integrated circuit such as LSI) in which at least two of a switching device, a rectifying device and a passive device are combined.
- Each functional device 9 includes an SBD in this form. Since the structures of a plurality of device regions 7 (functional devices 9) are the same, the structure of one device region 7 (functional device 9) will be described below.
- the wafer W includes a p-type (second conductivity type) guard region 10 formed in the surface layer portion of the first main surface 1 in the device region 7 .
- the guard region 10 is formed in the surface layer portion of the second region 6 with a space inward from the periphery of the device region 7 .
- the guard region 10 is formed in an annular shape (in this form, a square annular shape) surrounding the inner portion of the device region 7 in plan view.
- the guard region 10 has an inner edge on the inner side of the device region 7 and an outer edge on the peripheral side of the device region 7 .
- Wafer W includes main surface insulating film 11 covering first main surface 1 in device region 7 .
- Main surface insulating film 11 may include a silicon oxide film.
- Main surface insulating film 11 has contact opening 12 exposing the inner portion of device region 7 and the inner peripheral portion of guard region 10 .
- the main surface insulating film 11 covers the inner part of the device region 7 with a gap inward from the peripheral edge of the device region 7 , and extends the first main surface 1 (second region 6 ) from the peripheral edge of the device region 7 . exposing.
- the main surface insulating film 11 exposes the boundaries between the device regions 7 .
- the main surface insulating film 11 may cover the peripheral portion of the device region 7 (boundary portion between a plurality of device regions 7).
- Wafer W includes first main surface electrode 13 covering first main surface 1 in device region 7 .
- the first principal surface electrode 13 is arranged with a space inwardly from the peripheral edge of the device region 7 .
- the first main surface electrode 13 is formed in a rectangular shape along the periphery of the device region 7 in plan view.
- First main surface electrode 13 enters contact opening 12 from above main surface insulating film 11 and is electrically connected to first main surface 1 and the inner edge of guard region 10 .
- the first main surface electrode 13 forms a Schottky junction with the second region 6 (first main surface 1).
- the first principal surface electrode 13 may have a laminated structure including a Ti-based metal film and an Al-based metal film.
- the Ti-based metal film may have a single layer structure consisting of a Ti film or a TiN film.
- the Ti-based metal film may have a laminated structure including a Ti film and a TiN film in any order.
- the Al-based metal film is preferably thicker than the Ti-based metal film.
- the Al-based metal film may include at least one of a pure Al film (an Al film with a purity of 99% or higher), an AlCu alloy film, an AlSi alloy film, and an AlSiCu alloy film.
- the wafer W includes an insulating film 14 covering the first main surface electrode 13 in the device region 7 .
- the insulating film 14 covers the peripheral edge of the first main surface electrode 13 with a space inward from the peripheral edge of the device region 7 .
- the insulating film 14 defines the pad openings 15 in the inner part of the device region 7 and defines the street openings 16 in the peripheral part of the device region 7 .
- Pad opening 15 exposes the inner portion of first main surface electrode 13 .
- the street opening 16 extends along the periphery of the device region 7 and exposes the first main surface 1 .
- the street openings 16 are partitioned into a lattice shape extending in the first direction X and the second direction Y by a plurality of insulating films 14 adjacent to each other in the first direction X and the second direction Y, and the plurality of device regions 7 are exposed (a plurality of planned cutting lines 8).
- the insulating film 14 defines a street opening 16 exposing the main surface insulating film 11 .
- the insulating film 14 has a laminated structure including an inorganic insulating film 17 (inorganic film) and an organic insulating film 18 (organic film) laminated in this order from the first principal surface electrode 13 side.
- Inorganic insulating film 17 preferably contains an insulating material different from main surface insulating film 11 .
- the inorganic insulating film 17 is made of a silicon nitride film in this embodiment.
- the organic insulating film 18 is thicker than the inorganic insulating film 17 and forms the main body of the insulating film 14 .
- the organic insulating film 18 is preferably made of photosensitive resin.
- the organic insulating film 18 may include at least one of polyimide film, polyamide film and polybenzoxazole film.
- the organic insulating film 18 may cover the inorganic insulating film 17 so that one or both of the inner and outer peripheral portions of the inorganic insulating film 17 are exposed. In this form, the organic insulating film 18 exposes both the inner peripheral portion and the outer peripheral portion of the inorganic insulating film 17 and partitions the inorganic insulating film 17 into the pad openings 15 and the street openings 16 .
- the wafer W includes a pad electrode 19 arranged in the pad opening 15 and covering the inner portion of the first main surface electrode 13 in the device region 7 .
- the pad electrode 19 has an electrode surface located within the pad opening 15 and is not arranged outside the pad opening 15 .
- the pad electrode 19 has a laminated structure including a Ni film laminated on the first principal surface electrode 13, a Pd film laminated on the Ni film, and an Au film laminated on the Pd film. may be
- the presence or absence of the insulating film 14 and the pad electrode 19 is optional. Therefore, a wafer W having the insulating film 14 and no pad electrode 19 may be employed. Also, a wafer W having pad electrodes 19 without insulating film 14 may be employed. Also, a wafer W that does not have the insulating film 14 and the pad electrode 19 may be employed.
- FIG. 3 is a plan view showing the support stage 20A according to the first embodiment.
- FIG. 4 is a cross-sectional view taken along line IV-IV shown in FIG.
- FIG. 5 is a cross-sectional view taken along line V-V shown in FIG.
- the support stage 20A is a jig for supporting the wafer W to be supported.
- the wafer W is indicated by a two-dot chain line.
- the support stage 20A includes a base portion 21 made of metal.
- the base portion 21 may be made of stainless steel (for example, SUS303, SUS304, etc.).
- the base portion 21 is formed in a disc shape in this embodiment.
- the base portion 21 has a first plate surface 22 on one side, a second plate surface 23 on the other side, and side walls 24 connecting the first plate surface 22 and the second plate surface 23 .
- the base portion 21 preferably has a diameter that exceeds the diameter of the wafer W. As shown in FIG.
- the diameter of the base portion 21 is defined by the length of a chord passing through the center of the first plate surface 22 (second plate surface 23). From the viewpoint of positioning accuracy of the wafer W, the diameter of the base portion 21 is preferably larger than the diameter of the wafer W by a value of 1 mm or more and 20 mm or less.
- the support stage 20A includes a metal support portion 25 protruding from the peripheral portion of the first plate surface 22 in the base portion 21 .
- the support portion 25 may be made of stainless steel (for example, SUS303, SUS304, etc.).
- the support portion 25 is formed integrally with the base portion 21 in this embodiment.
- the support portion 25 is configured to support the wafer W in a state where the second main surface 2 of the wafer W abuts and is separated from the first plate surface 22 (base portion 21).
- “abutment of the second main surface 2 against the support portion 25” includes the case where the second main surface 2 of the wafer W is directly abutted against the support portion 25. 2 is indirectly in contact with the support portion 25 via another member such as a cushioning material (for example, resin).
- the support part 25 protrudes in a strip shape extending along the periphery of the first plate surface 22 .
- the support portion 25 is provided in an annular shape (annular shape in this embodiment) that surrounds the inner portion of the first plate surface 22 in plan view, and partitions the first plate surface 22 and the circular recess. ing.
- the support portion 25 abuts on the peripheral portion of the second main surface 2 of the wafer W over the entire circumference.
- the supporting portion 25 is configured to overlap the peripheral portion of the wafer W that does not have the device region 7 when the wafer W is in contact with the wafer W in a plan view. In this case, it is particularly preferable that the support portion 25 is configured so as not to overlap the plurality of device regions 7 in plan view.
- the support portion 25 has a contact surface 26 against which the second main surface 2 contacts, an inner wall 27 on the inner side of the support stage 20A, and an outer wall 28 on the peripheral side of the support stage 20A.
- the contact surface 26 preferably consists of a flat surface extending parallel to the second main surface 2 .
- the inner wall 27 continues to the first plate surface 22 of the support stage 20A and partitions the first plate surface 22 and the recess.
- the outer wall 28 continues to the side wall 24 of the support stage 20A. Of course, the outer wall 28 may be located inside the first plate surface 22 with respect to the side wall 24 .
- the support portion 25 has an arc contact portion 29 and a linear contact portion 30 in this embodiment.
- the arc contact portion 29 has a side extending arcuately along the arc portion outside the mark 4 (orientation flat) of the wafer W, and is a portion that contacts the arc portion.
- the linear contact portion 30 has a side that extends linearly along the mark 4 and is a portion of the wafer W that contacts the mark 4 .
- the linear contact portion 30 is formed wider than the circular arc contact portion 29 .
- the width of the support portion 25 is preferably within the range of 1 mm or more and 20 mm or less.
- the width of the support portion 25 is the width in the direction orthogonal to the direction in which the support portion 25 extends.
- the thickness of the support portion 25 is preferably 1 mm or more and 10 mm or less.
- the ratio of the thickness to the width of the support portion 25 is preferably 1 or less.
- the thickness of the support portion 25 is the thickness in the vertical direction Z of the support portion 25 .
- the support portion 25 may be formed by recessing a portion of the first plate surface 22 of the base portion 21 toward the second plate surface 23 by cutting, pressing, or the like.
- the support portion 25 may be formed separately from the base portion 21 and attached to the support stage 20A by welding (welding), crimping (crimping), fitting, screwing, or the like.
- the support stage 20A includes at least one suction groove 31 provided in the support portion 25.
- the suction groove 31 is a groove to which a suction force directed from the support portion 25 side to the base portion 21 side is applied from the outside, and is provided on the contact surface 26 .
- the suction groove 31 is configured to apply a suction force (adsorption force) to the second main surface 2 when the second main surface 2 is in contact with the contact surface 26 .
- the number of suction grooves 31 is arbitrary.
- the support stage 20A includes a plurality of suction grooves 31 in this form.
- the plurality of suction grooves 31 includes a first suction groove 31A on the inner wall 27 side of the support portion 25 and a second suction groove 31B on the outer wall 28 side of the support portion 25 in this embodiment.
- the first suction groove 31A is formed in a strip shape extending along the inner wall 27 in plan view.
- the first suction groove 31A is formed in an annular shape (in this embodiment, an annular shape) surrounding the inner wall 27 in plan view.
- the first suction groove 31A may be formed in a strip shape with ends extending along the inner wall 27 in plan view.
- the second suction groove 31B is formed on the contact surface 26 in a region between the first suction groove 31A and the outer wall 28 with a gap from the first suction groove 31A toward the outer wall 28 side.
- the second suction groove 31B is formed in a strip shape extending along the first suction groove 31A in plan view.
- the second suction groove 31B is formed in an annular shape (in this form, an annular shape) surrounding the first suction groove 31A in plan view.
- the second suction groove 31B may be formed in a belt shape with ends extending along the first suction groove 31A in plan view.
- the first suction groove 31A and the second suction groove 31B include arc portions 32 and linear portions 33, respectively.
- the arc portion 32 is a portion extending in an arc shape along the arc contact portion 29 of the support portion 25 .
- the linear portion 33 is a portion that extends linearly along the linear contact portion 30 of the support portion 25 . It is preferable that the first suction groove 31A and the second suction groove 31B each include an arc portion 32 and a linear portion 33, even when they are formed in a strip shape with ends.
- each suction groove 31 is preferably within the range of 1 mm or more and 5 mm or less.
- the width of each suction groove 31 is the width in the direction orthogonal to the direction in which each suction groove 31 extends. It is preferable that the depth of each suction groove 31 is equal to or less than the depth of the support portion 25 .
- the depth of each suction groove 31 is preferably less than the depth of the support portion 25 .
- the depth of each suction groove 31 may be 1 mm or more and 10 mm or less.
- the support stage 20A includes suction holes 34 provided inside one or both of the base portion 21 and the support portion 25 (both in this embodiment) so as to communicate with the suction grooves 31 .
- the suction hole 34 defines a suction channel for applying a suction force from the outside to the suction groove 31 .
- the suction hole 34 is provided on the linear contact portion 30 side of the support portion 25 in this embodiment.
- the suction holes 34 specifically include a first hole 34a on the support portion 25 side and a second hole 34b on the base portion 21 side.
- the first hole 34a is dug down from the contact surface 26 toward the second plate surface 23 so as to communicate with each suction groove 31 (straight line portion 33).
- the first hole 34a may be formed in a circular shape or a square shape in plan view.
- the second hole 34 b is provided in a portion of the base portion 21 located below the support portion 25 .
- the second hole 34b extends from the side wall 24 of the base portion 21 in the lateral direction (the first direction X in this embodiment) along the first plate surface 22 and communicates with the first hole 34a.
- the second hole 34b may be formed in a circular shape or a square shape when viewed from the normal direction of the side wall 24 .
- the suction holes 34 are provided on the arc contact portion 29 side of the support portion 25 .
- the first hole 34a and the second hole 34b may be formed so as to pass through the base portion 21 and the support portion 25 in the vertical direction Z. As shown in FIG.
- the support stage 20A includes at least one (in this embodiment, one) ejection hole 35 (ejecting hole) provided in the inner portion of the base portion 21 (see the thick-lined portion in the accompanying drawings; the same shall apply hereinafter).
- the ejection holes 35 may also be referred to as "outlet holes.”
- the ejection holes 35 are configured to be supplied with gas from the outside and eject the gas toward the second main surface 2 of the wafer W. As shown in FIG. Specifically, the ejection holes 35 are supplied with a gas having a flow rate (pressure) that corrects the warpage of the wafer W from the outside, and the gas maintains the pressure while the second main surface 2 is exposed. is configured to be ejected toward the The gas may be air.
- the ejection hole 35 is provided in a region surrounded by the support portion 25 with a space therebetween.
- the ejection hole 35 penetrates in the vertical direction Z through the first plate surface 22 and the second plate surface 23 .
- the ejection hole 35 is preferably provided in the central portion of the first plate surface 22 . It is preferable that the ejection hole 35 is provided at a position shifted from the center of the base portion 21 .
- the ejection hole 35 is preferably provided at a position where the distance from the center of the base portion 21 is less than the distance from the support portion 25 .
- the ejection holes 35 may be provided offset from the center of the first plate surface 22 in one or both of the first direction X and the second direction Y. In this embodiment, the ejection holes 35 are spaced apart from the center of the first plate surface 22 on one side in the first direction X (the side opposite to the linear contact portion 30). That is, the ejection holes 35 are spaced apart from the center of the first plate surface 22 in the direction orthogonal to the extending direction of the linear contact portion 30 (orientation flat of the wafer W).
- the ejection hole 35 is formed in a circular shape in plan view in this form.
- the planar shape of the ejection hole 35 is arbitrary.
- the ejection hole 35 may be formed in a square shape, a hexagonal shape, an elliptical shape, or the like in plan view.
- the width (maximum value) of the ejection holes 35 preferably exceeds the width of each suction groove 31 . It is particularly preferable that the width of the ejection hole 35 exceeds the total width of the plurality of suction grooves 31 .
- the width of the ejection hole 35 may be 1 mm or more and 20 mm or less.
- the width of the orifice 35 is defined in this configuration by the length of the chord passing through the center of the orifice 35 .
- the support stage 20A includes at least one (one in this embodiment) exhaust hole 36 provided in one or both of the base portion 21 and the support portion 25 (in this embodiment, the base portion 21) (see FIG. 3). (See thin lines).
- the exhaust hole 36 is configured to discharge the gas ejected from the ejection hole 35 from the space S between the base portion 21, the support portion 25 and the wafer W (second main surface 2). That is, the exhaust hole 36 is configured to suppress an increase in air pressure in the space S caused by the ejected gas.
- the exhaust hole 36 is provided in a region surrounded by the support portion 25 with a space from the support portion 25 and the ejection hole 35 .
- the exhaust hole 36 penetrates in the vertical direction Z through the first plate surface 22 and the second plate surface 23 .
- the exhaust hole 36 is preferably provided adjacent to the ejection hole 35 in the central portion of the first plate surface 22 .
- the exhaust hole 36 is preferably provided at a position shifted from the center of the base portion 21 .
- the exhaust hole 36 is preferably provided at a position where the distance from the center of the base portion 21 is less than the distance from the support portion 25 .
- the exhaust hole 36 may be provided offset from the center of the first plate surface 22 in one or both of the first direction X and the second direction Y.
- the exhaust holes 36 are spaced apart from the center of the first plate surface 22 on the other side in the first direction X (the side of the linear contact portion 30). That is, the exhaust holes 36 are spaced apart from the center of the first plate surface 22 in a direction orthogonal to the extending direction of the linear contact portion 30 (orientation flat of the wafer W).
- the exhaust hole 36 faces the ejection hole 35 with the center of the first plate surface 22 interposed therebetween in plan view. That is, when a line perpendicular to the straight contact portion 30 is set, the exhaust hole 36 and the ejection hole 35 are positioned on the line.
- the exhaust hole 36 is preferably positioned on a concentric circle surrounding the center of the first plate surface 22 together with the ejection hole 35 .
- the exhaust hole 36 is formed in a circular shape in plan view in this form.
- the planar shape of the exhaust hole 36 is arbitrary.
- the exhaust hole 36 may be formed in a square shape, a hexagonal shape, an elliptical shape, or the like in plan view.
- the width (maximum value) of the exhaust hole 36 preferably exceeds the width of each suction groove 31 . It is particularly preferable that the width of the exhaust hole 36 exceeds the total width of the plurality of suction grooves 31 .
- the width of the exhaust hole 36 may be 1 mm or more and 20 mm or less.
- the width of the vent 36 is defined in this form by the length of the chord passing through the center of the vent 36 .
- the width of the exhaust hole 36 may be equal to or greater than the width of the ejection hole 35 or may be less than the width of the ejection hole 35 .
- the width of the exhaust hole 36 is approximately equal to the width of the ejection hole 35 in this embodiment.
- FIG. 6 is a schematic diagram showing one form example of the support device 40 to which the support stage 20A shown in FIG. 3 is applied.
- the wafer W is indicated by a two-dot chain line.
- support device 40 is a processing device that sucks and supports wafer W from the second main surface 2 side by support stage 20A and performs predetermined processing on first main surface 1 of wafer W. is.
- the support device 40 includes a support stage 20A, a suction unit 41, a gas supply unit 42, a processing unit 43, and a control unit 44.
- the suction unit 41 includes, for example, a suction pump (for example, a vacuum pump) and is connected to the suction hole 34 via a first pipe 45 .
- the gas supply unit 42 includes, for example, a gas supply pump (for example, an air compressor) and is connected to the ejection holes 35 via a second pipe 46 .
- the gas ejected from the ejection holes 35 contacts the second main surface 2 of the wafer W and is exhausted to the outside through the exhaust holes 36 . That is, the gas supply unit 42 is not a pressurizing unit that pressurizes the space S partitioned by the base portion 21 , the support portion 25 and the wafer W.
- the processing unit 43 is configured to perform predetermined processing on the first main surface 1 of the wafer W.
- the processing unit 43 is composed of a tape conveying unit that removes foreign matter adhering to the first main surface 1 side with an adhesive tape 47 .
- the processing unit 43 includes, for example, an adhesive tape 47, a first roller 48 for unwinding the tape 47, a second roller 49 for adhering the tape 47 to the first main surface 1 of the wafer W, and a roller 49 for attaching the tape 47 to the first main surface 1 of the wafer W.
- a third roller 50 for winding the tape 47 may be included.
- the control unit 44 is connected to the suction unit 41 , gas supply unit 42 and processing unit 43 and controls the suction unit 41 , gas supply unit 42 and processing unit 43 .
- the control unit 44 includes a CPU and memory (for example, ROM, RAM, nonvolatile memory, etc.), and controls the suction unit 41, the gas supply unit 42, and the processing unit 43 to perform predetermined processing based on a predetermined processing recipe stored in the memory. Control by action.
- FIG. 7 is a flow chart showing an example of a method for manufacturing a semiconductor device.
- 8A to 8J are schematic diagrams for explaining one step of the method of manufacturing a semiconductor device.
- 8A to 8J a plurality of device regions 7 and a plurality of planned cutting lines 8 are indicated by two-dot chain lines.
- a wafer W preparation process is performed (step S1 in FIG. 7).
- a wafer support plate 51 is prepared separately, and a step of supporting the wafer W by the wafer support plate 51 is performed (step S2 in FIG. 7).
- Any material can be used for the wafer support plate 51 as long as the wafer W can be supported from the first main surface 1 side.
- the wafer support plate 51 may be made of the same material as the wafer W, or may be made of a different material.
- the wafer support plate 51 may be made of an inorganic plate, an organic plate, a metal plate, a crystal plate, or an amorphous plate processed into a disc shape.
- the wafer support plate 51 is preferably made of a light transmissive or transparent material.
- the wafer support plate 51 is made of an amorphous plate (specifically, a glass plate (silicon oxide plate)) in this embodiment.
- the wafer support plate 51 is made of a crystalline plate or an amorphous plate, it is preferable that the wafer support plate 51 is free of impurities.
- the wafer support plate 51 includes a first support plate surface 52 on one side (wafer W side), a second support plate surface 53 on the other side, and a support surface connecting the first support plate surface 52 and the second support plate surface 53 . It has sides 54 .
- the diameter and thickness of wafer support plate 51 are arbitrary. However, from the viewpoint of handling, the wafer support plate 51 preferably has a diameter equal to or larger than the diameter of the wafer W. FIG. Moreover, it is preferable that the wafer support plate 51 has a thickness equal to or greater than the thickness of the wafer W. As shown in FIG. Wafer support plate 51 has a diameter and thickness that exceed those of wafer W in this configuration. The corners of the wafer support plate 51 may be chamfered.
- the first support plate surface 52 of the wafer support plate 51 is adhered to the first main surface 1 of the wafer W via an adhesive layer 55 containing an adhesive and a release agent.
- the adhesive layer 55 may be a laminated film in which an adhesive and a release agent are separately formed, or may be a single layer film in which the release agent is contained in the adhesive.
- the adhesive layer 55 includes an adhesive film 55a and a release agent film 55b laminated in this order from the first main surface 1 side.
- the adhesive film 55 a may be formed by applying a liquid adhesive onto the first main surface 1 or by applying a film adhesive onto the first main surface 1 .
- the release agent film 55b may be formed by applying a liquid release agent onto the adhesive film 55a or by sticking a film release agent onto the adhesive film 55a. good.
- the adhesive film 55a and the release agent film 55b may be formed by adhering to the first main surface 1 a single-layer film or laminated film containing an adhesive and a release agent.
- the adhesive (adhesive film 55a) may include at least one of UV curable resin, thermosetting resin and thermoplastic resin film.
- the release agent (release agent film 55b) is made of a resin having physical properties different from those of the adhesive (adhesive film 55a).
- the release agent (release agent film 55b) may contain at least one of a thermosetting resin film and a thermoplastic resin film.
- a thinning process for the wafer W is performed (step S3 in FIG. 7).
- the second main surface 2 is ground while the wafer W is supported by the wafer support plate 51 .
- the grinding step of the second main surface 2 may be performed by a CMP (Chemical Mechanical Polishing) method. Thereby, the wafer W is thinned to a desired thickness.
- the wafer W is thinned in this form to a thickness of less than 150 ⁇ m.
- the wafer W preferably has a thickness of 5 ⁇ m or more and 100 ⁇ m or less after being thinned.
- the wafer W may have a laminated structure including the first region 5 (semiconductor substrate) and the second region 6 (epitaxial layer) after thinning, or the second region 6 (epitaxial layer) You may have a single layer structure consisting of. That is, a semiconductor device having a laminated structure including the first region 5 and the second region 6 may be manufactured, or a semiconductor device having a single layer structure including the second region 6 may be manufactured.
- a step of removing the wafer support plate 51 is performed (step S4 in FIG. 7).
- the adhesive layer 55 is irradiated with a laser beam (for example, a YAG laser) by a laser irradiation method, and the release agent contained in the adhesive layer 55 is carbonized.
- the release agent film 55b is irradiated with laser light and carbonized. It is preferable that the release agent film 55b is irradiated with the laser light through the wafer support plate 51 from the second support plate surface 53 side of the wafer support plate 51 .
- the release agent film 55b is appropriately carbonized because the laser beam is irradiated from the wafer support plate 51 side, which has few obstructions, toward the release agent film 55b.
- the release agent film 55b is irradiated with the laser light without passing through the wafer W, damage to the wafer W caused by the laser light is suppressed.
- the wafer support plate 51 is separated from the wafer W.
- a part of the adhesive layer 55 remains on the first main surface 1 of the wafer W after the wafer support plate 51 is peeled off.
- the adhesive film 55a of the adhesive layer 55 remains attached to the first main surface 1 of the wafer W.
- the thinned wafer W released from the wafer support plate 51 has a warp with the center of curvature above the first main surface 1 .
- the wafer W has a concave curved warp in which the height position of the central portion is relatively lower than the height position of the peripheral edge portion. Wafer W is warped due to the stress of structures (for example, first main surface electrode 13 and the like) on first main surface 1 side.
- the wafer W has a warp starting point 57 extending along the first crystal axis of the SiC single crystal in the direction along the first main surface 1 at the center.
- the warp starting point 57 is in the shape of a valley fold in this form.
- the warpage of the wafer W increases from the warp starting point 57 toward the second crystal axis of the SiC single crystal orthogonal to the first crystal axis of the SiC single crystal, the first main surface 1 (silicon surface) and the second main surface 2 ( The carbon surface) is formed in a valley-fold shape that slopes upward.
- the first crystal axis may be the m-axis direction of the SiC single crystal
- the second crystal axis may be the a-axis direction of the SiC single crystal.
- the first crystal axis may be the a-axis direction of the SiC single crystal
- the second crystal axis may be the m-axis direction of the SiC single crystal.
- Two points located on the warpage starting point 57 on the peripheral edge of the wafer W are located on the same plane.
- Two points located on the second crystal axis perpendicular to the warp starting point 57 on the peripheral edge of the wafer W are on a different plane (warp starting point 57 on a plane that lies above relative to).
- the magnitude of the warp that occurs on one side of the second crystal axis with respect to the warp start point 57 and the magnitude of the warp that occurs on the other side of the second crystal axis with respect to the warp start point 57 do not necessarily match. Therefore, two points located on one second crystal axis on the peripheral edge of the wafer W may be located on the same plane or may be located on different planes.
- the wafer W may have a warp amount Aw of 100 ⁇ m or more and 10000 ⁇ m or less.
- the warp amount Aw of the wafer W is defined by the maximum distance along the vertical direction Z of the gap formed between the plane and the second main surface 2 when the wafer W is arranged on a plane.
- wafer W having a foreign substance (adhesive film 55a in this embodiment) adhering to first main surface 1 is loaded into supporting device 40 (see FIG. 8F).
- Step S5 in FIG. 7 The wafer W is mounted on the support stage 20A in such a posture that the second main surface 2 is brought into contact with the support portion 25 of the support stage 20A (step S6 in FIG. 7).
- suction unit 41 is controlled to be turned on, and suction force is applied to suction groove 31 .
- a suction force directed toward the support stage 20A is applied from the suction groove 31 to the peripheral portion of the second main surface 2, and the wafer W is supported by the support portion 25 by suction.
- the central portion of the wafer W is positioned on the first plate surface 22 side of the base portion 21 with respect to the contact surface 26 of the support portion 25 , and the peripheral portion of the wafer W is positioned on the contact surface 26 of the support portion 25 .
- the wafer W is preferably spaced apart from the first plate surface 22 . Due to the warpage, the peripheral edge of the wafer W has stress applied in a direction opposite to the suction direction (that is, in a direction away from the support section 25). Therefore, the suction of the second main surface 2 to the contact surface 26 is insufficient.
- a case in which a gap is formed between the second main surface 2 and the contact surface 26 due to warpage is exemplified as an example of insufficient adsorption.
- a step of correcting warpage of wafer W is performed (step S7 in FIG. 7).
- the gas supply unit 42 is turned on while the exhaust hole 36 is open, and the gas having a flow rate (pressure) for correcting the warp of the wafer W is supplied to the ejection hole 35 .
- the ejection holes 35 eject gas having a flow rate (pressure) that corrects the warp toward the second main surface 2 .
- the ejected gas is brought into contact with the central portion of the second main surface 2 in this form. Specifically, the jetted gas is brought into contact with the warp starting point 57 of the wafer W or the vicinity of the warp starting point 57 .
- a pressing force (correction force) in a direction away from the base portion 21 (first plate surface 22) is applied to the central portion of the second main surface 2. That is, in this step, a suction force in a direction toward the base portion 21 is applied to the peripheral portion of the second main surface 2 , and a pressing force in a direction away from the base portion 21 is applied to the central portion of the second main surface 2 . .
- the pressing force exceeds the suction force, the wafer W falls off from the supporting portion 25 . Therefore, the pressing force is adjusted to a range equal to or less than the suction force (preferably less than the suction force).
- the central portion of the wafer W is displaced in the direction away from the base portion 21, and the warpage of the wafer W is corrected.
- the gap between the second main surface 2 and the contact surface 26 is reduced, and the force of attraction of the second main surface 2 to the contact surface 26 is increased.
- the ejected gas is discharged from the space S partitioned by the base portion 21 , the support portion 25 and the wafer W through the exhaust hole 36 to the outside. This suppresses an increase in air pressure in the space S during the warp correction process.
- a predetermined treatment process is performed on first main surface 1 of wafer W (step S8 in FIG. 7).
- the treatment process on the first main surface 1 side is performed in parallel with the warp correction process.
- the treatment process includes a step of removing foreign matter from the first main surface 1 by the treatment unit 43 (in this embodiment, a step of peeling off the adhesive film 55a).
- the processing unit 43 supplies an adhesive tape 47 on the first main surface 1 so as to be adhered to the adhesive film 55a, and winds the tape 47 to which the adhesive film 55a is adhered.
- the adhesive film 55a is removed from the first main surface 1. Then, as shown in FIG.
- this step is performed within a range in which the sum of the pressing force of the ejected gas and the pulling force of the tape 47 does not exceed the suction force on the support portion 25 side.
- the sum of the pressing force of the ejected gas and the pulling force of the tape 47 is adjusted to a range equal to or less than the suction force (preferably less than the suction force).
- the pressing force is preferably adjusted to be less than the pulling force of the tape 47 .
- the first main surface 1 since the warpage of the wafer W is corrected, the first main surface 1 can be appropriately processed. That is, the adhesive film 55a can be properly removed from the first main surface 1 by reducing the warpage.
- step S9 in FIG. 7 wafer W is unloaded from supporting device 40 (step S9 in FIG. 7), and second main surface electrode 58 is formed on second main surface 2.
- step S10 in FIG. 7 The wafer W after the formation of the second main-surface electrode 58 may have a valley-fold or mountain-fold warp due to the stress of the second main-surface electrode 58. 8 to cut out a plurality of wide bandgap semiconductor devices (SiC semiconductor devices in this embodiment) (step S11 in FIG. 7).
- SiC semiconductor devices in this embodiment step S11 in FIG. 7
- the step of forming the second main surface electrode 58 can be performed at any timing after the thinning step of the wafer W (step S3 in FIG. 7).
- the step of forming the second main surface electrode 58 is performed after the step of thinning the wafer W (step S3 in FIG. 7) and before the step of removing the wafer support plate 51 (step S4 in FIG. 7). may be implemented.
- each step from the step of removing the wafer support plate 51 (step S4 in FIG. 7) to the step of unloading the wafer W (step S9 in FIG. 7) includes forming the second main surface electrode 58 on the second main surface 2. is formed. Therefore, the wafer W is mounted on the support stage 20A in such a posture that the second main surface electrode 58 is brought into contact with the support portion 25 of the support stage 20A (step S6 in FIG. 7). The case where the second main surface 2 of the wafer W is brought into contact with the support portion 25 via the second main surface electrode 58 is also included in the “contact of the second main surface 2 with the support portion 25 ”.
- FIG. 9 is a graph showing the results of warpage processing when the exhaust hole 36 is closed and air pressure control is applied.
- the vertical axis indicates the attraction force [kPa] of the wafer W to the support portion 25, and the horizontal axis indicates the atmospheric pressure [kPa] in the space S.
- the suction force applied to the suction groove 31 is fixed at a constant value.
- FIG. 9 shows a first polygonal line L1, a second polygonal line L2, and a processable line LP (see broken lines).
- a first polygonal line L1 indicates the result when a Si single crystal wafer W is adopted.
- a second polygonal line L2 indicates the result when a high-hardness wafer W (SiC single crystal wafer W) is used.
- a processable line LP indicates a line along which a series of processing steps are performed without the wafer W falling off the support stage 20A.
- the adsorption force of the wafer W to the supporting portion 25 increased as the air pressure in the space S increased. This means that as the amount of correction of the warpage of the Si single crystal wafer W increases, the attraction force to the wafer W increases.
- the attraction force to the wafer W exceeded the processable line LP in the range where the atmospheric pressure of the space S is between the first atmospheric pressure P1 and the second atmospheric pressure P2 (P1 ⁇ P2).
- the air pressure in the space S exceeds the second air pressure P2
- the attraction force to the wafer W sharply decreases. That is, as a result of the force pushing up the Si single crystal wafer W exceeding the suction force, the wafer W dropped from the supporting portion 25 .
- the adsorption force of the wafer W to the support portion 25 increased as the atmospheric pressure of the space S increased.
- the attraction force to the wafer W increases as the amount of correction of the warp of the wafer W having a high hardness increases.
- the attraction force to the wafer W did not exceed the processable line LP even when the air pressure in the space S was increased to a third air pressure P3 (P2 ⁇ P3), which is higher than the second air pressure P2.
- P3 P2 ⁇ P3
- the attraction force to the wafer W sharply decreased when the atmospheric pressure of the space S exceeded the third atmospheric pressure P3. That is, in the case of the wafer W with high hardness, the force pushing up the wafer W exceeded the suction force before the warp was corrected, and the wafer W fell off the supporting portion 25 .
- the air pressure in the space S increases. That is, in the case of air pressure control, a force for pushing up the wafer W is generated in the entire area of the second main surface 2 of the wafer W facing the first plate surface 22 .
- the Si single crystal wafer W has relatively low hardness and is easily deformed. Therefore, the warpage of the Si single crystal wafer W is corrected by the relatively low atmospheric pressure.
- the high-hardness wafer W has higher hardness than the Si single-crystal wafer W and is less likely to deform. Therefore, the warpage of the wafer W having a high hardness is corrected by an air pressure higher than the air pressure applied to the wafer W of single crystal Si.
- the atmospheric pressure control for the wafer W of high hardness requires advanced control for balancing the atmospheric pressure, the pressing force, and the suction force.
- FIG. 10 is a graph showing the results of processing warpage when the exhaust hole 36 is opened and air pressure control is not applied.
- the vertical axis indicates the attraction force [kPa] of the wafer W to the supporting portion 25
- the horizontal axis indicates the flow rate [L/min] of the gas ejected from the ejection holes 35 .
- the suction force applied to the suction groove 31 is fixed at a constant value.
- FIG. 10 shows the third polygonal line L3 and the aforementioned processable line LP.
- a third polygonal line L3 indicates the result when a high-hardness wafer W (SiC single crystal wafer W) is used.
- the attraction force of the high-hardness wafer W to the support portion 25 increased as the flow rate of the ejected gas increased.
- the chucking force of the wafer W exceeded the processability line LP when the flow rate of the ejected gas was in the range between the first flow rate F1 and the second flow rate F2 (F1 ⁇ F2).
- the first flow rate F1 is a value exceeding 0 L/min.
- the attraction force of the wafer W sharply decreases. That is, as a result of the force pushing up the wafer W having a high hardness exceeding the suction force, the wafer W fell off from the supporting portion 25 .
- the pressing force for correcting the warpage is applied from the ejected gas to the wafer W, while the pressure increase in the space S is suppressed.
- the ejected gas is locally sprayed to the location where the warp of the wafer W starts (in this embodiment, the inner portion of the wafer W). That is, a suction force (adsorption force) is applied to the wafer W at the peripheral portion of the wafer W, and a pressing force for correcting the warpage of the wafer W is locally applied at the inner portion of the wafer W.
- the support stage 20A includes the base portion 21, the support portion 25, the suction grooves 31, the ejection holes 35, and the exhaust holes .
- the support portion 25 is provided protruding from the peripheral portion of the base portion 21 and is configured so that the second main surface 2 (support surface) of the wafer W abuts thereon.
- the suction groove 31 is provided in the support portion 25 and configured to apply a suction force to the second main surface 2 .
- the ejection hole 35 is provided in the inner portion of the base portion 21 and configured to eject gas toward the second main surface 2 .
- the exhaust hole 36 is provided in at least one of the base portion 21 and the support portion 25 (the base portion 21 in this embodiment) and configured to exhaust gas from the space S between the base portion 21, the support portion 25 and the support surface. It is With this structure, the support stage 20A capable of correcting the warpage of the wafer W can be provided. The support stage 20A is effective in correcting the warp of the wafer W by controlling the gas flow rate.
- FIG. 11 is a plan view showing a support stage 20B according to the second embodiment.
- the support stage 20B is a jig that is applied to the support device 40 and provides the same effects as the support stage 20A.
- support stage 20B includes ejection holes 35 spaced apart from the center of first plate surface 22 on one side in second direction Y. As shown in FIG. In other words, the ejection holes 35 are spaced from the center of the first plate surface 22 in the extending direction of the linear contact portion 30 (orientation flat of the wafer W).
- the support stage 20B includes an exhaust hole 36 spaced from the center of the first plate surface 22 on the other side in the second direction Y. That is, the exhaust holes 36 are spaced from the center of the first plate surface 22 in the direction in which the linear contact portion 30 extends. In other words, when a line is set perpendicular to the linear contact portion 30, the exhaust hole 36 and the ejection hole 35 are positioned on the line.
- FIG. 12 is a plan view showing a support stage 20C according to the third embodiment.
- the support stage 20C is a jig that is applied to the support device 40 and provides the same effects as the support stage 20A.
- support stage 20C is provided spaced from the center of first plate surface 22 in one of first direction X and second direction Y (in this embodiment, first direction X). , including spouts 35 . That is, the ejection holes 35 are spaced apart from the center of the first plate surface 22 in the direction orthogonal to the extending direction of the linear contact portion 30 . Further, when a first line orthogonal to the linear contact portion 30 is set so as to pass through the center of the first plate surface 22, the ejection holes 35 are positioned on the first line together with the center of the first plate surface 22. ing.
- the support stage 20C includes exhaust holes 36 spaced from the center of the first plate surface 22 in a direction different from the ejection holes 35 (in this embodiment, the second direction Y).
- the exhaust holes 36 are spaced from the center of the first plate surface 22 in the direction in which the linear contact portion 30 extends.
- a second line orthogonal to the first line is set so as to pass through the center of the first plate surface 22 , the exhaust holes 36 are positioned on the second line together with the center of the first plate surface 22 .
- FIG. 13 is a plan view showing a support stage 20D according to the fourth embodiment.
- the support stage 20D is a jig that is applied to the support device 40 and provides the same effects as the support stage 20A.
- support stage 20C includes a plurality of ejection holes 35 provided in first plate surface 22 in this embodiment.
- the plurality of ejection holes 35 are provided at intervals in one or both of the first direction X and the second direction Y from the center of the first plate surface 22 .
- the plurality of ejection holes 35 are preferably arranged at positions where the distance from the center of the base portion 21 is less than the distance from the support portion 25, as in the case of the first embodiment.
- the plurality of ejection holes 35 includes first to fourth ejection holes 35A to 35D in this embodiment.
- the first and second ejection holes 35A to 35B are provided at intervals on one side and the other side in the first direction X from the center of the first plate surface 22, and are arranged in the first direction with the center of the first plate surface 22 interposed therebetween. They face each other in direction X.
- the third to fourth ejection holes 35C to 35D are spaced apart on one side and the other side in the second direction Y from the center of the first plate surface 22, and are arranged on both sides of the center of the first plate surface 22. They face each other in direction Y.
- the plurality of ejection holes 35 are preferably positioned on concentric circles surrounding the center of the first plate surface 22 .
- the support stage 20D includes a plurality of exhaust holes 36 provided in the first plate surface 22 in this embodiment.
- the plurality of exhaust holes 36 are provided at intervals in one or both of the first direction X and the second direction Y from the center of the first plate surface 22 .
- the plurality of exhaust holes 36 are preferably arranged at positions where the distance from the center of the base portion 21 is less than the distance from the support portion 25, as in the case of the first embodiment.
- the plurality of exhaust holes 36 include first to fourth exhaust holes 36A to 36D in this embodiment.
- the first and second exhaust holes 36A and 36B are provided at intervals on one side and the other side in the first direction X from the center of the first plate surface 22, and are arranged in the first direction with the center of the first plate surface 22 interposed therebetween. They face each other in direction X.
- the first and second exhaust holes 36A-36B are arranged so as to sandwich the first and second ejection holes 35A-35B from both sides in the first direction X, respectively.
- the third to fourth exhaust holes 36C to 36D are provided spaced apart from the center of the first plate surface 22 on one side and the other side in the second direction Y, and are arranged in the second direction with the center of the first plate surface 22 interposed therebetween. They face each other in direction Y.
- the third to fourth exhaust holes 36C to 36D are arranged so as to sandwich the third to fourth ejection holes 35C to 35D from both sides in the second direction Y, respectively.
- the plurality of exhaust holes 36 are preferably positioned on concentric circles surrounding the center of the first plate surface 22 .
- FIG. 14 is a plan view showing a support stage 20E according to the fifth embodiment.
- the support stage 20E is a jig that is applied to the support device 40 and provides the same effects as the support stage 20A.
- support stage 20E has a structure in which the arrangement of a plurality of ejection holes 35 is changed in support stage 20D (see FIG. 13).
- the first and second ejection holes 35A and 35B are spaced from the center of the first plate surface 22 on one side and the other side of the direction intersecting the first direction X and the second direction Y. ing.
- the first and second ejection holes 35A to 35B are arranged in quadrants Q1 to Q4. They are located in the first quadrant Q1 and the third quadrant Q3 of one plate surface 22, respectively.
- the first and second ejection holes 35A and 35B are arranged on lines inclined +45° with respect to the first direction X, and are opposed to each other with the center of the first plate surface 22 interposed therebetween.
- the third to fourth ejection holes 35C to 35D are spaced from the center of the first plate surface 22 on one side and the other side of the direction intersecting the first direction X and the second direction Y. ing. When the cross lines are set, the third to fourth ejection holes 35C to 35D are located in the second quadrant Q2 and the fourth quadrant Q4 of the first plate surface 22, respectively.
- the third to fourth ejection holes 35C to 35D are arranged on lines inclined -45° with respect to the first direction X, and face each other across the center of the first plate surface 22. . Also, in this embodiment, the third to fourth ejection holes 35C to 35D are arranged at positions facing the first and second ejection holes 35A to 35B in the first direction X and the second direction Y, respectively.
- the plurality of ejection holes 35 are preferably positioned on concentric circles surrounding the center of the first plate surface 22, as in the case of the support stage 20D (see FIG. 13).
- FIG. 15 is a plan view showing a support stage 20F according to the sixth embodiment.
- the support stage 20F is a jig that is applied to the support device 40 and provides the same effects as the support stage 20A.
- support stage 20F has a structure in which the arrangement of a plurality of exhaust holes 36 is changed in support stage 20D (see FIG. 13).
- the first and second exhaust holes 36A and 36B are spaced from the center of the first plate surface 22 on one side and the other side of the direction intersecting the first direction X and the second direction Y. ing.
- the first and second exhaust holes 36A to 36B are arranged in quadrants Q1 to Q4. They are located in the first quadrant Q1 and the third quadrant Q3 of one plate surface 22, respectively.
- first and second exhaust holes 36A and 36B are arranged on lines inclined +45° with respect to the first direction X, and are opposed to each other with the center of the first plate surface 22 interposed therebetween.
- first and second exhaust holes 36A and 36B are arranged in the first direction X and the second direction Y at positions not facing the plurality of ejection holes 35, respectively.
- the third to fourth exhaust holes 36C to 36D are spaced from the center of the first plate surface 22 on one side and the other side of the direction intersecting the first direction X and the second direction Y. ing.
- the third to fourth exhaust holes 36C to 36D are located in the second quadrant Q2 and the fourth quadrant Q4 of the first plate surface 22, respectively.
- the third to fourth exhaust holes 36C to 36D are arranged on lines inclined -45° with respect to the first direction X, and are opposed to each other across the center of the first plate surface 22. .
- the third and fourth exhaust holes 36C-36D are arranged at positions facing the first and second exhaust holes 36A-36B in the first direction X and the second direction Y, respectively.
- the third to fourth exhaust holes 36C to 36D are arranged in the first direction X and the second direction Y at positions not facing the plurality of ejection holes 35, respectively.
- the plurality of exhaust holes 36 are preferably positioned on concentric circles surrounding the center of the first plate surface 22, as in the case of the support stage 20D (see FIG. 13).
- FIG. 16 is a plan view showing a support stage 20G according to the seventh embodiment.
- the support stage 20G is a jig that is applied to the support device 40 and provides the same effects as the support stage 20A.
- support stage 20G has a structure in which support stage 20E (see FIG. 14) according to the fifth embodiment and support stage 20F (see FIG. 15) according to the sixth embodiment are combined. .
- first and second exhaust holes 36A-36B are arranged in the first quadrant Q1 and the third quadrant Q3 together with the first and second ejection holes 35A-35B, respectively. located on the same line.
- third to fourth exhaust holes 36C to 36D are arranged in the second quadrant Q2 and the fourth quadrant Q4 together with the third to fourth ejection holes 35C to 35D. located on the same line.
- the plurality of ejection holes 35 are preferably positioned on concentric circles surrounding the center of the first plate surface 22, as in the case of the support stage 20D (see FIG. 13). Also, the plurality of exhaust holes 36 are preferably positioned on concentric circles surrounding the center of the first plate surface 22, as in the case of the support stage 20D (see FIG. 13).
- FIG. 17 is a plan view showing a support stage 20H according to the eighth embodiment.
- the support stage 20H is a jig that is applied to the support device 40 and provides the same effects as the support stage 20A.
- support stage 20H includes one ejection hole 35 located in the central portion of first plate surface 22 .
- the ejection hole 35 is provided at a position overlapping the center of the first plate surface 22 in this embodiment.
- the support stage 20H includes a plurality of exhaust holes 36 (a plurality of exhaust holes 36A to 36D) located in the central portion of the first plate surface 22.
- the plurality of exhaust holes 36 each have a width less than the width of the ejection holes 35 .
- Arrangement locations of the plurality of exhaust holes 36 are arbitrary.
- the plurality of exhaust holes 36 may be arranged in a layout similar to the layout of the plurality of exhaust holes 36 associated with the support stages 20D-20H (see FIGS. 13-17). That is, the plurality of exhaust holes 36 may be spaced apart in the first direction X and the second direction Y from the ejection hole 35 , or may be provided in the first direction X and the second direction Y from the ejection hole 35 . They may be provided at intervals in the direction of the direction.
- FIG. 18 is a plan view showing a support stage 20I according to the ninth embodiment.
- the support stage 20I is a jig that is applied to the support device 40 and provides the same effects as the support stage 20A.
- support stage 20I includes at least one (one in this embodiment) ejection hole 35 extending in the first direction X in the central portion of first plate surface 22 in this embodiment.
- the ejection hole 35 extends in a direction orthogonal to the extending direction of the linear contact portion 30 (orientation flat of the wafer W) so as to pass through the center of the first plate surface 22 .
- the ejection holes 35 may be spaced apart from the support portion 25 or may be connected to the support portion 25 .
- the support stage 20I includes at least one (in this form, a plurality of) exhaust holes 36 spaced apart from the ejection holes 35 in the second direction Y.
- the plurality of exhaust holes 36 includes a first exhaust hole 36A and a second exhaust hole 36B in this embodiment.
- 36 A of 1st exhaust holes are provided in the one side of the 2nd direction Y from the ejection hole 35 at intervals.
- the second exhaust hole 36B is provided on the other side in the second direction Y with a space from the ejection hole 35 .
- the second exhaust hole 36B faces the first exhaust hole 36A with the ejection hole 35 interposed therebetween.
- the width of each of the plurality of exhaust holes 36 is preferably less than the width of each of the ejection holes 35 .
- the plurality of exhaust holes 36 may be spaced apart from the support portion 25 or may be connected to the support portion 25 .
- the planar shape of the plurality of exhaust holes 36 is arbitrary.
- the plurality of exhaust holes 36 are formed in strips extending along the ejection holes 35 in this embodiment.
- the plurality of exhaust holes 36 may be circular or polygonal in plan view.
- the plurality of exhaust holes 36 may include a plurality of first exhaust holes 36A and a plurality of second exhaust holes 36B spaced apart along the ejection hole 35 .
- FIG. 19 is a plan view showing a support stage 20J according to the tenth embodiment.
- the support stage 20J is a jig that is applied to the support device 40 and provides the same effects as the support stage 20A.
- support stage 20J in this embodiment includes at least one (one in this embodiment) ejection hole 35 extending in the second direction Y in the central portion of first plate surface 22 .
- the ejection hole 35 extends in the extending direction of the linear contact portion 30 (orientation flat of the wafer W) so as to pass through the center of the first plate surface 22 .
- the ejection holes 35 may be spaced apart from the support portion 25 or may be connected to the support portion 25 .
- the support stage 20J includes at least one (in this embodiment, a plurality of) exhaust holes 36 spaced apart from the ejection holes 35 in the second direction Y.
- the plurality of exhaust holes 36 includes a first exhaust hole 36A and a second exhaust hole 36B in this embodiment.
- 36 A of 1st exhaust holes are provided in the one side of the 1st direction X from the ejection hole 35 at intervals.
- the second exhaust hole 36B is spaced apart from the ejection hole 35 on the other side in the first direction X. As shown in FIG.
- the second exhaust hole 36B faces the first exhaust hole 36A with the ejection hole 35 interposed therebetween.
- each of the plurality of exhaust holes 36 is preferably less than the width of each of the ejection holes 35.
- the plurality of exhaust holes 36 may be spaced apart from the support portion 25 or may be connected to the support portion 25 .
- the planar shape of the plurality of exhaust holes 36 is arbitrary.
- the plurality of exhaust holes 36 are formed in strips extending along the ejection holes 35 in this embodiment.
- the plurality of exhaust holes 36 may be circular or polygonal in plan view.
- the plurality of exhaust holes 36 may include a plurality of first exhaust holes 36A and a plurality of second exhaust holes 36B spaced apart along the ejection hole 35 .
- FIG. 20 is a plan view showing a support stage 20K according to the eleventh embodiment.
- the support stage 20K is a jig that is applied to the support device 40 and provides the same effects as the support stage 20A.
- support stage 20K in this embodiment includes at least one (in this embodiment, a plurality of) ejection holes 35 extending in an arcuate band shape in the central portion of first plate surface 22 .
- the plurality of ejection holes 35 are provided in the shape of arcs extending along the periphery of the base portion 21 so as to surround the center of the first plate surface 22 at intervals from the center of the first plate surface 22 . It is particularly preferable that the plurality of ejection holes 35 are provided on concentric circles surrounding the center of the first plate surface 22 .
- the support stage 20K includes at least one (in this embodiment, a plurality of) exhaust holes 36 extending in an arcuate band shape in the central portion of the first plate surface 22 .
- the plurality of exhaust holes 36 are spaced apart from the plurality of ejection holes 35 and are provided in an arc band shape extending along the ejection holes 35 (periphery of the base portion 21).
- the plurality of exhaust holes 36 are provided so as to surround the plurality of ejection holes 35 . It is particularly preferable that the plurality of exhaust holes 36 are provided on concentric circles surrounding the center of the first plate surface 22 .
- FIG. 21 is a plan view showing a support stage 20L according to the twelfth embodiment.
- 22 is a cross-sectional view taken along line XXII-XXII shown in FIG. 21.
- FIG. The support stage 20L is a jig that is applied to the support device 40 and provides the same effects as the support stage 20A.
- support stage 20L in this embodiment includes a metal inner support portion 60 projecting inward from first plate surface 22 of base portion 21 .
- the inner support portion 60 may be made of stainless steel (for example, SUS303, SUS304, etc.).
- the inner support portion 60 is a portion with which the second main surface 2 of the wafer W abuts on the inner portion of the first plate surface 22 relative to the support portion 25 .
- the inner support portion 60 is integrally formed with the base portion 21 in this embodiment.
- the inner support portion 60 is configured to be in contact with the inner portion of the second main surface 2 and support the wafer W while being separated from the first plate surface 22 (base portion 21).
- the inner support portion 60 projects in a columnar shape (a columnar shape in this embodiment) at a position overlapping the center of the first plate surface 22 .
- the inner support portion 60 may be formed in a polygonal prism shape.
- the inner support portion 60 defines an annular (annular in this embodiment) recess with the first plate surface 22 and the support portion 25 in the inner portion of the base portion 21 .
- the inner support portion 60 has an inner contact surface 61 with which the second main surface 2 contacts.
- the inner contact surface 61 preferably consists of a flat surface extending parallel to the second main surface 2 .
- the width of the inner support portion 60 is preferably within the range of 1 mm or more and 50 mm or less. The width of the inner support 60 is defined by the length of the chord passing through the center of the inner support 60 in this configuration.
- the support stage 20L includes at least one inner suction hole 62 provided in the inner support portion 60.
- the inner suction hole 62 penetrates the base portion 21 and the inner support portion 60 in the vertical direction Z, and is configured so that a suction force directed from the inner support portion 60 side to the base portion 21 side is applied from the outside. It is
- the inner suction hole 62 is configured to apply a suction force (adsorption force) to the second main surface 2 when the second main surface 2 is in contact with the inner suction hole 62 .
- the inner suction hole 62 is formed in a circular shape in plan view.
- the inner suction hole 62 may be formed in a polygonal shape in plan view.
- the width of the inner suction hole 62 is preferably within the range of 1 mm or more and 45 mm or less.
- the width of the inner suction hole 62 is defined in this form by the length of the chord passing through the center of the inner suction hole 62 .
- At least one support stage 20L (this In the form, it includes a plurality of ejection holes 35 .
- the shape, number and arrangement of the ejection holes 35 are arbitrary.
- the ejection holes 35 may be arranged in a layout similar to the layout of the ejection holes 35 related to the support stages 20A-20O (see FIGS. 3-21).
- the ejection holes 35 may be arranged in a layout that is a combination of at least two layouts out of layouts of the ejection holes 35 related to the support stages 20A to 20O (see FIGS. 3 to 21).
- the support stage 20 ⁇ /b>L is at least spaced apart from the ejection holes 35 , the support portion 25 and the inner support portion 60 in the region between the support portion 25 and the inner support portion 60 on the first plate surface 22 . It includes one (in this form a plurality) exhaust holes 36 .
- the shape, number and arrangement of the exhaust holes 36 are arbitrary.
- the exhaust holes 36 may be arranged in a layout similar to the layout of the exhaust holes 36 associated with the support stages 20A-20O (see FIGS. 3-21).
- the exhaust holes 36 may be arranged in a layout combining at least two layouts of the exhaust hole 36 layouts of the support stages 20A to 20O (see FIGS. 3 to 21).
- the support device 40 may have a suction unit 41 connected to the support section 25 and the inner support section 60.
- the support device 40 may include a first suction unit 41 connected to the support 25 and a second suction unit 41 connected to the inner support 60 .
- FIG. 23 is a plan view showing a support stage 20M according to the thirteenth embodiment.
- 24 is a cross-sectional view taken along line XXIV-XXIV shown in FIG. 23.
- FIG. The support stage 20M is a jig that is applied to the support device 40 and provides the same effects as the support stage 20A.
- support stage 20M in this embodiment includes at least one (four in this embodiment) exhaust holes 36 provided in support portion 25 .
- a vent hole 36 according to this form may be referred to as a "peripheral vent hole".
- the plurality of exhaust holes 36 are provided at thickness positions spaced apart from the suction grooves 31 in the support portion 25, and penetrate the inner wall 27 and the outer wall 28 of the support portion 25, respectively.
- a portion of each vent 36 may be located within the base portion 21 .
- the shape, number and arrangement of each exhaust hole 36 are arbitrary.
- the structure in which the support portion 25 is provided with the exhaust holes 36 may be applied to the support stages 20A to 20P (see FIGS. 3 to 22).
- FIG. 25 is a plan view showing a support stage 20N according to the fourteenth embodiment. 26 is a cross-sectional view taken along line XXVI-XXVI shown in FIG. 25. FIG. 27 is a cross-sectional view taken along line XXVII-XXVII shown in FIG. 25.
- the support stage 20N is a jig that is applied to the support device 40 and provides the same effects as the support stage 20A. Referring to FIGS. 25 to 27, support stage 20N in this embodiment includes a support portion 25 protruding in the shape of an arc from the periphery of base portion 21. As shown in FIG.
- the support portion 25 includes at least one segment support portion 64 partitioned into a band-like shape with at least one slit 63 at the peripheral portion of the base portion 21 .
- the supporting portion 25 has a structure in which the wafer W is supported by at least one segment supporting portion 64 in this embodiment.
- the support section 25 includes a plurality of (four in this embodiment) segment support sections 64 partitioned by a plurality of (four in this embodiment) slits 63 in a band-like manner with ends.
- the plurality of slits 63 are each formed in an arc shape extending along the periphery of the base end in plan view, and the plurality of segment support portions 64 are each formed in an arc band shape extending along the periphery of the base end in plan view.
- the number, position and size of the slits 63 and the segment support portions 64 are arbitrary.
- Each suction groove 31 is provided on the contact surface 26 of each segment support portion 64 at a distance from the periphery of each segment support portion 64 .
- Each suction groove 31 extends in an arc band shape in each segment support portion 64 .
- Each suction hole 34 has a first hole 34 a and a second hole 34 b communicating with each suction groove 31 in each segment support portion 64 .
- the aforementioned exhaust holes 36 are formed by slits 63 of the support portion 25 in this embodiment.
- a vent hole 36 according to this form may be referred to as a "peripheral vent hole”.
- the support device 40 may have a single suction unit 41 connected to multiple suction holes 34.
- the support device 40 may have a plurality of suction units 41 respectively connected to the plurality of suction holes 34 so as to individually control the suction force of the plurality of suction holes 34 (suction grooves 31).
- FIG. 28 is a plan view showing another form example of the wafer W shown in FIG.
- FIG. 29 is an enlarged cross-sectional view of the main part of the functional device 9 shown in FIG.
- functional device 9 in this embodiment includes a MISFET (Metal Insulator Semiconductor Field Effect Transistor) instead of SBD.
- the MISFET is of trench gate type in this form.
- the structure of one functional device 9 (device region 7) is described below.
- Wafer W includes a p-type body region 70 formed in the surface layer portion of first main surface 1 in device region 7 .
- the body region 70 is formed in the surface layer of the second region 6 with a gap from the bottom of the second region 6 toward the first main surface 1 side.
- Wafer W includes an n-type source region 71 formed in the surface layer of body region 70 .
- Source region 71 has a higher n-type impurity concentration than second region 6 .
- the source region 71 forms a channel of the second region 6 and the MISFET within the body region 70 .
- Wafer W includes a plurality of trench gate structures 72 formed on first main surface 1 in device region 7 .
- a plurality of trench gate structures 72 control channel inversion and non-inversion.
- a plurality of trench gate structures 72 extend through the body region 70 and the source region 71 to reach the second region 6 .
- the plurality of trench gate structures 72 may be arranged in the first direction X at intervals in a plan view and formed in strips extending in the second direction Y, respectively.
- Each trench gate structure 72 includes a gate trench 73 , a gate insulating film 74 and a gate electrode 75 .
- Gate trench 73 is formed in first main surface 1 .
- the gate insulating film 74 covers the walls of the gate trench 73 .
- the gate electrode 75 is embedded in the gate trench 73 with the gate insulating film 74 interposed therebetween.
- the gate electrode 75 faces the channel with the gate insulating film 74 interposed therebetween.
- Wafer W includes a plurality of trench source structures 76 formed in first main surface 1 in device region 7 .
- a plurality of trench source structures 76 are arranged in regions between two adjacent trench gate structures 72 on first main surface 1 .
- the plurality of trench source structures 76 may each be formed in a strip shape extending in the second direction Y when viewed from above.
- a plurality of trench source structures 76 extend through the body regions 70 and the source regions 71 to the second regions 6 .
- a plurality of trench source structures 76 have a depth that exceeds the depth of trench gate structures 72 .
- Each trench source structure 76 includes a source trench 77 , a source insulating film 78 and a source electrode 79 .
- Source trench 77 is formed in first main surface 1 .
- a source insulating film 78 covers the wall surface of the source trench 77 .
- the source electrode 79 is buried in the source trench 77 with the source insulating film 78 interposed therebetween.
- Wafer W includes a plurality of p-type contact regions 80 respectively formed in regions along a plurality of trench source structures 76 in device region 7 .
- the multiple contact regions 80 have a p-type impurity concentration higher than that of the body regions 70 .
- Each contact region 80 covers the sidewalls and bottom walls of each trench source structure 76 and is electrically connected to body region 70 .
- Wafer W includes a plurality of p-type well regions 81 respectively formed in regions along a plurality of trench source structures 76 in device region 7 .
- Each well region 81 has a p-type impurity concentration higher than that of the body regions 70 and lower than that of the contact regions 80 .
- Each well region 81 covers the corresponding trench source structure 76 with the corresponding contact region 80 therebetween.
- Each well region 81 covers the sidewalls and bottom walls of corresponding trench source structure 76 and is electrically connected to body region 70 .
- the wafer W includes the main surface insulating film 11 covering the first main surface 1 in the device region 7 .
- Main surface insulating film 11 continues to gate insulating film 74 and source insulating film 78 and exposes gate electrode 75 and source electrode 79 .
- the main surface insulating film 11 covers the peripheral portion of the device region 7 (boundary portion between a plurality of device regions 7).
- the main surface insulating film 11 may expose the peripheral portion of the device region 7 (the boundary portion between the plurality of device regions 7).
- Wafer W includes interlayer insulating film 82 covering main surface insulating film 11 in device region 7 .
- the interlayer insulating film 82 may include at least one of a silicon oxide film, a silicon nitride film and a silicon oxynitride film.
- An interlayer dielectric film 82 covers the plurality of trench gate structures 72 and the plurality of trench source structures 76 .
- the interlayer insulating film 82 may cover the peripheral portion of the device region 7 (the boundary portion between the plurality of device regions 7) with the main surface insulating film 11 interposed therebetween.
- the main surface insulating film 11 may expose the first main surface 1 or the main surface insulating film 11 at the peripheral portion of the device region 7 (the boundary portion between the plurality of device regions 7).
- Wafer W includes a plurality of first main surface electrodes 13 covering interlayer insulating film 82 in device region 7 .
- the plurality of first main surface electrodes 13 may have a laminated structure including a Ti-based metal film and an Al-based metal film.
- the plurality of first main surface electrodes 13 include gate main surface electrodes 13a and source main surface electrodes 13b in this embodiment.
- the gate main surface electrode 13a is arranged in a region close to the central portion of one side of the device region 7 in plan view.
- the gate main surface electrode 13a may be arranged at the corner of the device region 7 in plan view. In this form, the gate main surface electrode 13a is formed in a rectangular shape in plan view.
- the source main surface electrode 13b is arranged on the interlayer insulating film 82 with a gap from the gate main surface electrode 13a.
- the source main surface electrode 13b is formed in a polygonal shape having a recess recessed along the gate main surface electrode 13a in plan view.
- the source main surface electrode 13b may be formed in a square shape in plan view.
- Source main surface electrode 13 b penetrates interlayer insulating film 82 and main surface insulating film 11 and is electrically connected to multiple trench source structures 76 , source regions 71 and multiple well regions 81 .
- the wafer W includes a gate wiring electrode 83 drawn out onto the interlayer insulating film 82 from the gate main surface electrode 13 a in the device region 7 .
- the gate wiring electrode 83 may have a laminated structure including a Ti-based metal film and an Al-based metal film, like the plurality of first main surface electrodes 13 .
- the gate wiring electrode 83 is formed in a strip shape extending along the periphery of the device region 7 so as to intersect (specifically, perpendicularly) end portions of the plurality of trench gate structures 72 in plan view.
- the gate wiring electrode 83 penetrates the interlayer insulating film 82 and is electrically connected to the multiple trench gate structures 72 .
- the wafer W includes the insulating film 14 covering the plurality of first main surface electrodes 13 in the device region 7 .
- the insulating film 14 has a laminated structure including an inorganic insulating film 17 and an organic insulating film 18 laminated in this order from the first principal surface electrode 13 side.
- the insulating film 14 covers the peripheral edge of the gate main surface electrode 13a and the peripheral edge of the source main surface electrode 13b with an inward space from the peripheral edge of the device region 7. As shown in FIG.
- the insulating film 14 covers the entire area of the gate wiring electrode 83 .
- the insulating film 14 defines a plurality of pad openings 15 exposing the inner portion of the gate main surface electrode 13 a and the inner portion of the source main surface electrode 13 b in the inner portion of the device region 7 .
- a street opening 16 that exposes one or both of the main surface insulating film 11 and the interlayer insulating film 82 is defined at .
- the street opening 16 may expose the first main surface 1 .
- the plurality of pad openings 15 in this embodiment include gate pad openings 15a exposing the inner portions of the gate main surface electrodes 13a and source pad openings 15b exposing the inner portions of the source main surface electrodes 13b.
- the gate pad opening 15a is defined in a square shape along the periphery of the gate main surface electrode 13a in plan view.
- source pad opening 15b is formed in a polygonal shape along the periphery of source main surface electrode 13b in plan view.
- the organic insulating film 18 may cover the inorganic insulating film 17 so that one or both of the inner peripheral portion and the outer peripheral portion of the inorganic insulating film 17 are exposed. In this form, the organic insulating film 18 exposes both the inner peripheral portion and the outer peripheral portion of the inorganic insulating film 17 and partitions the inorganic insulating film 17 from the plurality of pad openings 15 and the street openings 16 . The organic insulating film 18 may cover the entire inorganic insulating film 17 .
- the wafer W includes a plurality of pad electrodes 19 respectively covering the plurality of first main surface electrodes 13 in the device region 7 .
- the plurality of pad electrodes 19 include gate pad electrodes 19a and source pad electrodes 19b in this embodiment.
- Gate pad electrode 19a is arranged in gate pad opening 15a and covers the inner portion of gate main surface electrode 13a.
- Gate pad electrode 19a has a surface of gate electrode 75 positioned within gate pad opening 15a and is not arranged outside gate pad opening 15a.
- Source pad electrode 19b is arranged in source pad opening 15b and covers the inner portion of source main surface electrode 13b.
- Source pad electrode 19b has a surface of source electrode 79 positioned within source pad opening 15b and is not arranged outside source pad opening 15b.
- the presence or absence of the insulating film 14 and the pad electrode 19 is optional. Therefore, a wafer W having the insulating film 14 and no pad electrode 19 may be employed. Also, a wafer W having pad electrodes 19 without insulating film 14 may be employed. Also, a wafer W that does not have the insulating film 14 and the pad electrode 19 may be employed.
- FIG. 30 is a plan view showing another form example of the support device 40 shown in FIG. Referring to FIG. 30, when support device 40 includes support stage 20x having a plurality of ejection holes 35, a plurality of ejection ports are provided so as to individually control the flow rate (pressure) of gas ejected from the plurality of ejection holes 35. It may have a plurality of gas supply units 42 each connected to the hole 35 .
- the support stage 20x is a support stage having a plurality of ejection holes 35 among the support stages 20A to 20N described above.
- FIG. 30 shows an example in which the support device 40 includes a first gas supply unit 42A connected to at least one ejection hole 35 and a second gas supply unit 42B connected to at least one ejection hole 35. ing.
- the support stage 20x includes a first jet hole 35 provided for a warp starting point portion 57 extending along the first crystal axis of the SiC single crystal, and a second crystal perpendicular to the first crystal axis of the SiC single crystal.
- a second jet hole 35 may be provided for the warp starting point 57 extending along the axis.
- the first gas supply unit 42A may be connected to the first ejection port 35
- the second gas supply unit 42B may be connected to the second ejection port 35.
- the warpage of the wafer W can be corrected by controlling the first gas supply unit 42A and the second gas supply unit 42B according to the structure (extending direction) of the warp starting point 57.
- the support stages 20A to 20N are applied to the wafer W having a valley-fold warp.
- whether the wafer W is warped in the form of a valley fold or warped in the form of a mountain fold may vary depending on the thickness of the wafer W, the stress caused by the structures built into the wafer W, and the like.
- the semiconductor device manufacturing method using the supporting stages 20A to 20N (supporting device 40) is also applicable to the wafer W having a mountain-folded warp.
- FIGS. 31A and 31B are schematic diagrams for explaining an example of a process performed on a wafer W having a mountain-folded warp.
- An example in which the support stage 20A is applied to the support device 40 is shown below.
- An example in which the second main surface electrode 58 is not formed on the second main surface 2 is shown below, but the following steps are performed when the second main surface electrode 58 is formed on the second main surface 2. It may be implemented in a state where
- the wafer W has a convex curved warp in which the height position of the central portion is relatively higher than the height position of the peripheral edge portion when the first main surface 1 faces upward.
- Wafer W is warped due to the stress of structures (for example, first main surface electrode 13 and the like) on first main surface 1 side.
- the wafer W has a warp starting point 57 extending along the first crystal axis of the SiC single crystal with respect to the direction along the first main surface 1 at the center.
- the warp starting point 57 is in the shape of a mountain fold in this form.
- the warpage of the wafer W increases from the warp starting point 57 toward the second crystal axis of the SiC single crystal orthogonal to the first crystal axis of the SiC single crystal, the first main surface 1 (silicon surface) and the second main surface 2 ( The carbon surface) is formed in a mountain-fold shape that slopes downward.
- the first crystal axis may be the m-axis direction of the SiC single crystal, and the second crystal axis may be the a-axis direction of the SiC single crystal.
- the first crystal axis may be the a-axis direction of the SiC single crystal, and the second crystal axis may be the m-axis direction of the SiC single crystal.
- the wafer W may have a warp amount Aw of 100 ⁇ m or more and 10000 ⁇ m or less, as in the case described above.
- wafer W having foreign matter (adhesive film 55a in this embodiment) adhering to first main surface 1 is loaded into supporting device 40 (see FIG. 31B).
- Step S5 in FIG. 7 The wafer W is mounted on the support stage 20A in such a posture that the second main surface 2 is brought into contact with the support portion 25 of the support stage 20A (step S6 in FIG. 7).
- the suction unit 41 is controlled to be turned on, and suction force is applied to the suction grooves 31 .
- a suction force directed toward the support stage 20A is applied from the suction groove 31 to the peripheral portion of the second main surface 2, and the wafer W is supported by the support portion 25 by suction.
- the peripheral portion of the wafer W is located on the contact surface 26 of the support portion 25, and the central portion of the wafer W is located above the height position of the peripheral portion of the wafer W with respect to the first plate surface 22.
- the central portion of the wafer W has stress applied in a direction opposite to the suction direction (that is, in a direction away from the support portion 25). Therefore, a gap due to the stress is formed between the second main surface 2 of the wafer W and the contact surface 26 , and the second main surface 2 is in a state where the suction of the second main surface 2 to the contact surface 26 is insufficient.
- step S7 in FIG. 7 the step of correcting the warpage of the wafer W (step S7 in FIG. 7) and the step of treating the first main surface 1 of the wafer W (step S8 in FIG. 7) are performed.
- the process of processing the first main surface 1 is performed in parallel with the process of correcting the warpage of the wafer W. As shown in FIG. In the processing step of the first main surface 1 , a pressing force toward the base portion 21 is applied to the wafer W, and the predetermined processing is performed on the first main surface 1 .
- the processing step includes a step of applying a pressing force to the wafer W toward the support stage 20A by pressing the processing unit 43 against the first main surface 1 .
- the processing step also includes a step of peeling off the adhesive film 55a from the first main surface 1 with the tape 47 while applying a pressing force to the wafer W.
- FIG. In the processing unit 43 the pulling force of the tape 47 against the first main surface 1 is adjusted to be less than the pressing force against the wafer W.
- a force is applied to the wafer W in the direction of deforming the wafer W from warping in the shape of mountain folds to warping in the shape of valley folds.
- an excessive pressing force is applied to the wafer W from the processing unit 43, the wafer W is deformed into a valley-folded warp, and as a result, the adsorption force of the second main surface 2 to the contact surface 26 is reduced. There is a possibility that it will drop off from the support portion 25 .
- the gas supply unit 42 is controlled to be turned on while the exhaust hole 36 is open, and gas having a flow rate (pressure) for correcting the warp of the wafer W is supplied to the ejection hole 35 .
- the ejection holes 35 eject gas having a flow rate (pressure) that corrects the warp toward the second main surface 2 .
- the ejected gas is brought into contact with the central portion of the second main surface 2 in this form. Specifically, the jetted gas is brought into contact with the warp starting point 57 of the wafer W or the vicinity of the warp starting point 57 .
- a pressing force (correction force) in a direction away from the base portion 21 (first plate surface 22) is applied to the central portion of the second main surface 2. That is, in this step, a suction force in a direction toward the base portion 21 is applied to the peripheral portion of the second main surface 2 while a pressing force toward the base portion 21 is applied to the wafer W from the processing unit 43 . A pressing force in a direction away from the portion 21 is applied to the central portion of the second main surface 2 .
- the wafer W is subjected to a force in the direction of deformation from the valley-folded warp to the mountain-folded warp (force in the opposite direction to the pressing force of the processing unit 43).
- the flow rate (pressure) of the gas with respect to the wafer W is adjusted so that the warp of the wafer W is corrected while the pressing force is applied to the wafer W from the processing unit 43 .
- the warp of the wafer W is suppressed, the gap between the second main surface 2 and the contact surface 26 is reduced, and the adsorption force of the second main surface 2 to the contact surface 26 is increased.
- the first main surface 1 can be appropriately processed. That is, the adhesive film 55a can be properly peeled off from the first main surface 1 by reducing the warpage.
- the wafer W has an orientation flat as an example of the mark 4 .
- the wafer W may have orientation notches as another example of the markings 4 instead of or in addition to the orientation flats.
- the orientation notch is a notch recessed in an arbitrary shape (for example, a V shape) toward the central portion of first main surface 1 in plan view.
- the orientation notch may be recessed in the a-axis direction or the m-axis direction.
- the mark 4 may include a first orientation notch recessed in the a-axis direction and a second orientation notch recessed in the m-axis direction.
- wafer W preferably has a diameter of 8 inches or greater. Further, when the wafer W having the orientation notch is placed on the support stages 20A-20N, it is preferable that the support stages 20A-20N do not have the linear contact portion 30.
- each of the support stages 20A to 20N has an arc-shaped or annular support portion 25 (at least one segment support portion 64) extending along the peripheral edge portion of the first plate surface 22 with a uniform width in plan view. preferably included.
- the supporting portion 25 is preferably configured so as to overlap the peripheral portion of the wafer W which does not have the device region 7 in plan view. It is particularly preferable that the support portion 25 is configured so as not to overlap the plurality of device regions 7 in plan view.
- the processing unit 43 was a tape transport unit.
- the processing that is performed on the first main surface 1 after the warpage of the wafer W is corrected is arbitrary, and the processing unit 43 is not limited to the tape transport unit.
- the processing unit 43 may be, for example, a fluid supply unit that supplies a fluid such as a gas, a chemical solution, or a solvent to the first main surface 1 of the wafer W. It may be a film sticking unit that does.
- the functional device 9 includes either one of the SBD and the MISFET.
- functional device 9 may include both SBDs and MISFETs. That is, both the SBD and MISFET may be formed within the same device region 7 .
- the functional device 9 includes a trench gate type MISFET.
- the functional device 9 may include a planar gate type MISFET instead of the trench gate type.
- the p-type first region 5 may be employed instead of the n-type first region 5 .
- the functional device 9 includes an IGBT (Insulated Gate Bipolar Transistor) instead of the MISFET.
- IGBT Insulated Gate Bipolar Transistor
- a configuration may be adopted in which the first conductivity type is p-type and the second conductivity type is n-type.
- a specific configuration in this case is obtained by replacing the n-type regions with p-type regions and the p-type regions with n-type regions in the above description and accompanying drawings.
- the support portion (25) is configured to contact the warped one surface (2) of the wafer (W), and the ejection holes (35) are provided on the wafer (W).
- the support part (25) protrudes in an annular shape surrounding the inner part of the base part (21), and the ejection hole (35) is formed in the inner part of the base part (21).
- a support stage (20A-20N) according to any one of A1-A6, provided in the area surrounded by the portion (25).
- the support portion (25) has a side that extends linearly along the orientation flat (4) of the wafer (W), and is a linear contact portion (30) that contacts the orientation flat (4).
- the suction groove (31) includes a first suction groove (31A) provided on the inner side of the base (21) and a second suction groove (31A) provided on the peripheral side of the base (21).
- the support stage (20A-20N) according to any one of A1-A13, including a suction groove (31B).
- A16 Any one of A1 to A15, including a plurality of the ejection holes (35) arranged along an arbitrary crystal direction (a-axis direction and/or m-axis direction) of the wafer (W) Support stages (20A-20N) as described.
- A17 Any one of A1 to A16, including a plurality of exhaust holes (36) arranged along an arbitrary crystal direction (a-axis direction and/or m-axis direction) of the wafer (W) Support stages (20A-20N) as described.
- the wafer (W) has the other side (1) located opposite to the one side (2) and having a plurality of device regions (7) arranged thereon.
- a support stage (20A-20N) according to any one of the preceding claims.
- a method for manufacturing a semiconductor device using the support device (40) according to A21 comprising a step of sucking the one surface (2) of the wafer (W) to the support portion (25);
- a method of manufacturing a semiconductor device comprising: ejecting gas from the ejection hole (35) toward the one surface (2) while the exhaust hole (36) is open.
- the warped wafer (W) is prepared, and the peripheral edge of the one side (2) of the wafer is adsorbed to the support portion (25), and pressure is applied to correct the warp of the wafer (W).
- A22 or A23 further including a processing step of performing a predetermined process on the other side (1) of the wafer (W) while the gas is jetted from the jet hole (35); A method of manufacturing the semiconductor device described.
- the wafer (W) having a foreign substance (55) adhering to the other surface (1) is prepared, and the processing step includes a step of removing the foreign substance (55) from the other surface (1). , A24.
- Wafer 1 first principal surface (other surface of wafer) 2 second main surface (one side of wafer) 4 Marks 20A to 20N Support stage 21 Base portion 25 Support portion 30 Linear contact portion 31 Suction groove 31A First suction groove 31B Second suction groove 35 Ejection hole 36 Exhaust hole 40 Support device 41 Suction unit 42 Gas supply unit 55 Adhesive layer (Foreign matter) 55b release agent film (foreign matter) S space
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Abstract
Description
1 第1主面(ウエハの他方面)
2 第2主面(ウエハの一方面)
4 目印
20A~20N 支持ステージ
21 基底部
25 支持部
30 直線当接部
31 吸引溝
31A 第1吸引溝
31B 第2吸引溝
35 噴出孔
36 排気孔
40 支持装置
41 吸引ユニット
42 気体供給ユニット
55 接着層(異物)
55b 離型剤膜(異物)
S 空間
Claims (20)
- 基底部と、
前記基底部の周縁部に突設され、ウエハの一方面が当接される支持部と、
前記支持部に設けられ、前記一方面に対する吸引力が付与される吸引溝と、
前記基底部の内方部に設けられ、前記一方面に向けて気体を噴出させる噴出孔と、
前記基底部および前記支持部の少なくとも一方に設けられ、前記基底部、前記支持部および前記一方面の間の空間から気体を排出する排気孔と、を含む、支持ステージ。 - 前記支持部は、反りを有する前記ウエハの前記一方面が当接されるように構成され、
前記噴出孔は、前記ウエハの反りを矯正する圧力を有する気体を噴出させるように構成され、
前記排気孔は、前記空間の気圧の上昇を抑制するように構成されている、請求項1に記載の支持ステージ。 - 前記ウエハは、Si単結晶の硬度を超える硬度を有する高硬度ウエハである、請求項1または2に記載の支持ステージ。
- 前記ウエハは、Siのバンドギャップを超えるバンドギャップを有するワイドバンドギャップ半導体ウエハである、請求項1~3のいずれか一項に記載の支持ステージ。
- 前記ウエハは、SiC単結晶を含むSiCウエハである、請求項1~4のいずれか一項に記載の支持ステージ。
- 前記支持部は、前記ウエハの前記一方面の周縁部が当接されるように構成されている、請求項1~5のいずれか一項に記載の支持ステージ。
- 前記支持部は、前記基底部の内方部を取り囲む環状に突設され、
前記噴出孔は、前記基底部の内方部において前記支持部によって取り囲まれた領域に設けられている、請求項1~6のいずれか一項に記載の支持ステージ。 - 前記吸引溝は、前記支持部に沿って帯状に延びている、請求項7に記載の支持ステージ。
- 前記噴出孔は、前記一方面の中央部に向けて気体を噴出させるように構成されている、請求項1~8のいずれか一項に記載の支持ステージ。
- 前記噴出孔は、前記基底部の中央部に設けられている、請求項1~9のいずれか一項に記載の支持ステージ。
- 前記排気孔は、前記基底部の内方部において前記噴出孔に隣り合って設けられている、請求項1~10のいずれか一項に記載の支持ステージ。
- 前記支持部は、前記ウエハのオリエンテーションフラットに沿って直線状に延びる辺を有し、前記オリエンテーションフラットに当接する直線当接部を有している、請求項1~11のいずれか一項に記載の支持ステージ。
- 前記吸引溝は、前記直線当接部に沿って直線状に延びる部分を有している、請求項12に記載の支持ステージ。
- 前記吸引溝は、前記基底部の内方側に設けられた第1吸引溝、および、前記基底部の周縁側に設けられた第2吸引溝を含む、請求項1~13のいずれか一項に記載の支持ステージ。
- 前記第1吸引溝は、帯状に延び、
前記第2吸引溝は、前記第1吸引溝に沿って帯状に延びている、請求項14に記載の支持ステージ。 - 請求項1~15のいずれか一項に記載の支持ステージと、
前記吸引溝に接続され、前記吸引溝に吸引力を付与する吸引ユニットと、
前記噴出孔に接続され、前記噴出孔に気体を供給する気体供給ユニットと、を含む、支持装置。 - 請求項16に記載の支持装置を用いた半導体装置の製造方法であって、
前記ウエハの前記一方面を前記支持部に吸着させる工程と、
前記排気孔を開放した状態で、前記一方面に向けて前記噴出孔から気体を噴出させる工程と、を含む、半導体装置の製造方法。 - 反りを有する前記ウエハが用意され、
前記ウエハの前記一方面の周縁部が前記支持部に吸着され、
前記ウエハの反りを矯正する圧力を有する気体が、前記噴出孔から前記一方面に向けて噴出される、請求項17に記載の半導体装置の製造方法。 - 前記噴出孔から気体が噴出された状態で、前記ウエハの他方面に対して予め定められた処理を実行する処理工程をさらに含む、請求項17または18に記載の半導体装置の製造方法。
- 前記他方面に付着した異物を有する前記ウエハが用意され、
前記処理工程は、前記他方面から前記異物を除去する工程を含む、請求項19に記載の半導体装置の製造方法。
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