WO2021095588A1 - 基板処理方法及び基板処理装置 - Google Patents
基板処理方法及び基板処理装置 Download PDFInfo
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- WO2021095588A1 WO2021095588A1 PCT/JP2020/041073 JP2020041073W WO2021095588A1 WO 2021095588 A1 WO2021095588 A1 WO 2021095588A1 JP 2020041073 W JP2020041073 W JP 2020041073W WO 2021095588 A1 WO2021095588 A1 WO 2021095588A1
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- Prior art keywords
- substrate
- polymerized
- wafer
- grinding
- thickness distribution
- Prior art date
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- 239000000758 substrate Substances 0.000 title claims abstract description 195
- 238000003672 processing method Methods 0.000 title claims description 10
- 238000009826 distribution Methods 0.000 claims abstract description 98
- 238000000034 method Methods 0.000 claims abstract description 36
- 238000006116 polymerization reaction Methods 0.000 claims description 38
- 230000008569 process Effects 0.000 claims description 20
- 235000012431 wafers Nutrition 0.000 description 261
- 238000004140 cleaning Methods 0.000 description 26
- 238000005259 measurement Methods 0.000 description 11
- 230000006866 deterioration Effects 0.000 description 9
- 239000002184 metal Substances 0.000 description 8
- 230000032258 transport Effects 0.000 description 8
- 239000007788 liquid Substances 0.000 description 7
- 230000002093 peripheral effect Effects 0.000 description 7
- 238000003754 machining Methods 0.000 description 6
- 230000007246 mechanism Effects 0.000 description 6
- 239000006061 abrasive grain Substances 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 230000003028 elevating effect Effects 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229920000307 polymer substrate Polymers 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
- B24B49/02—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation according to the instantaneous size and required size of the workpiece acted upon, the measuring or gauging being continuous or intermittent
- B24B49/04—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation according to the instantaneous size and required size of the workpiece acted upon, the measuring or gauging being continuous or intermittent involving measurement of the workpiece at the place of grinding during grinding operation
- B24B49/05—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation according to the instantaneous size and required size of the workpiece acted upon, the measuring or gauging being continuous or intermittent involving measurement of the workpiece at the place of grinding during grinding operation including the measurement of a first workpiece already machined and of another workpiece being machined and to be matched with the first one
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
- B24B49/12—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation involving optical means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B7/00—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor
- B24B7/04—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor involving a rotary work-table
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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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/67005—Apparatus not specifically provided for elsewhere
- H01L21/67011—Apparatus for manufacture or treatment
- H01L21/67092—Apparatus for mechanical treatment
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L22/00—Testing or measuring during manufacture or treatment; Reliability measurements, i.e. testing of parts without further processing to modify the parts as such; Structural arrangements therefor
- H01L22/10—Measuring as part of the manufacturing process
- H01L22/12—Measuring as part of the manufacturing process for structural parameters, e.g. thickness, line width, refractive index, temperature, warp, bond strength, defects, optical inspection, electrical measurement of structural dimensions, metallurgic measurement of diffusions
Definitions
- This disclosure relates to a substrate processing method and a substrate processing apparatus.
- Patent Document 1 in a plate-shaped work formed by laminating a first plate-shaped work and a second plate-shaped work, measurement of at least three points of the first plate-shaped work held on a holding table is performed.
- a grinding method including a step of measuring the thickness at a position, a step of adjusting the parallelism of the first plate-shaped work according to the measured thickness, and a step of grinding the second plate-shaped work after adjusting the parallelism.
- the technique according to the present disclosure appropriately improves the flatness of the first substrate in the polymerized substrate in which the first substrate and the second substrate are bonded.
- One aspect of the present disclosure is a method of finishing and grinding the rough-ground first substrate in a substrate processing apparatus on a polymerized substrate in which a first substrate and a second substrate are joined, and the substrate processing is performed.
- a plurality of polymerized substrates are continuously processed, and the thickness distribution of one of the first substrates before finish grinding in one polymerized substrate is measured, and the first before finish grinding in another polymerized substrate is measured.
- the substrate holding portion for holding the other polymerization substrate and the polymerization substrate To determine the relative inclination with respect to the grinding portion for finish grinding, and to finish grind the first substrate in the other polymerized substrate while holding the other polymerized substrate at the determined inclination. And, including.
- the flatness of the first substrate can be appropriately improved.
- first substrate a polymer substrate in which a device such as a plurality of electronic circuits is formed on the surface
- second substrate a polymer substrate in which a device such as a plurality of electronic circuits is formed on the surface
- the thinning of the first substrate is performed by bringing a grinding wheel into contact with the back surface of the first substrate in a state where the back surface of the second substrate is held by the substrate holding portion and grinding.
- TTV Total Tickness Variation
- the grinding method described in Patent Document 1 described above detects a variation in the thickness of the second substrate (first plate-shaped work) and adjusts the inclination of the substrate holding portion (holding table).
- This is a grinding method for grinding the substrate (second plate-shaped work) of No. 1 with a uniform thickness.
- the second substrate (first plate-shaped work) is generated by the measurement light emitted from the non-contact type thickness measuring means provided above the polymerized substrate (plate-shaped work). The thickness of is calculated directly. The measurement light passes through the first substrate (second plate-shaped work).
- the thickness of the second substrate including the metal film cannot be calculated appropriately.
- the measurement light for example, IR light
- the metal can be obtained from either the first substrate side or the second substrate side.
- the thickness of the second substrate including the film cannot be measured appropriately. Since the thickness distribution of the second substrate containing the metal film cannot be appropriately measured in this way, the inclination of the grinding wheel that comes into contact with the first substrate, that is, the grinding amount can be appropriately calculated.
- the technique according to the present disclosure appropriately improves the flatness of the first substrate in the polymerized substrate in which the first substrate and the second substrate are bonded.
- the processing apparatus as the substrate processing apparatus and the processing method as the substrate processing method according to the present embodiment will be described with reference to the drawings.
- elements having substantially the same functional configuration are designated by the same reference numerals, so that duplicate description will be omitted.
- the processing apparatus 1 As a polymerization substrate in which the first wafer W as the first substrate and the second wafer S as the second substrate are bonded.
- the polymerized wafer T is processed.
- the first wafer W is thinned.
- the surface on the side to be joined to the second wafer S is referred to as a front surface Wa
- the surface opposite to the front surface Wa is referred to as a back surface Wb.
- the surface on the side to be joined to the first wafer W is referred to as the front surface Sa
- the surface opposite to the front surface Sa is referred to as the back surface Sb.
- the first wafer W is a semiconductor wafer such as a silicon substrate, and a device layer D including a plurality of devices is formed on the surface Wa.
- a surface film F is further formed on the device layer D, and is bonded to the second wafer S via the surface film F.
- the surface film F include an oxide film (SiO 2 film, TEOS film), a SiC film, a SiCN film, and an adhesive.
- the peripheral edge of the first wafer W is removed in advance in order to prevent the peripheral portion from being formed with a sharply pointed shape (so-called knife edge shape) by the grinding process in the processing apparatus 1.
- the peripheral edge portion is, for example, in the range of 0.5 mm to 3 mm in the radial direction from the outer end portion of the first wafer W.
- the second wafer S has the same structure as the first wafer W, for example, and the device layer D and the surface film F are formed on the surface Sa. Further, the peripheral edge portion of the second wafer S is chamfered, and the cross section of the peripheral edge portion becomes thinner toward the tip thereof.
- the second wafer S does not have to be a device wafer on which the device layer D is formed, and may be, for example, a support wafer that supports the first wafer W. In such a case, the second wafer S functions as a protective material for protecting the device layer D on the surface Wa of the first wafer W.
- the device layer D and the surface film F may be shown together and numbered as the device layer and the surface film "DF".
- the processing apparatus 1 has a configuration in which the loading / unloading station 2 and the processing station 3 are integrally connected.
- the carry-in / out station 2 carries in / out a cassette Ct capable of accommodating a plurality of polymerized wafers T with, for example, the outside.
- the processing station 3 is provided with various processing devices that perform desired processing on the polymerized wafer T.
- the loading / unloading station 2 is provided with a cassette mounting stand 10.
- a cassette mounting stand 10 In the illustrated example, a plurality of, for example, four cassette Cts can be freely mounted in a row on the cassette mounting table 10 in the X-axis direction.
- the number of cassettes Ct mounted on the cassette mounting table 10 is not limited to this embodiment and can be arbitrarily determined.
- the loading / unloading station 2 is provided with a wafer transfer area 20 adjacent to the cassette mounting table 10 on the Y-axis positive direction side of the cassette mounting table 10.
- the wafer transfer region 20 is provided with a wafer transfer device 22 configured to be movable on a transfer path 21 extending in the X-axis direction.
- the wafer transfer device 22 has a transfer fork 23 that holds and conveys the polymerized wafer T.
- the tip of the transport fork 23 is branched into two, and the polymerized wafer T is adsorbed and held.
- the transport fork 23, for example, transports the polymerized wafer T before and after the grinding process.
- the transport fork 23 is configured to be movable in the horizontal direction, the vertical direction, the horizontal axis, and the vertical axis.
- the configuration of the wafer transfer device 22 is not limited to this embodiment, and any configuration can be adopted.
- the wafer transfer device 22 may include two transfer forks 23 that transfer the polymerized wafer T before and after the grinding process.
- the processing station 3 includes a rotary table 30, a transport unit 40, an alignment unit 50, a first cleaning unit 60, a second cleaning unit 70, a rough grinding unit 80, a medium grinding unit 90, and a finishing grinding unit as a finishing grinding unit. Has 100.
- the rotary table 30 is rotatably configured by a rotary mechanism (not shown).
- a rotary mechanism (not shown).
- four chucks 31 are provided as substrate holding portions for sucking and holding the polymerized wafer T.
- the chucks 31 are arranged evenly on the same circumference as the rotary table 30, that is, every 90 degrees.
- the four chucks 31 can be moved to the delivery position A0 and the processing positions A1 to A3 by rotating the rotary table 30.
- each of the four chucks 31 is configured to be rotatable around a vertical axis by a rotation mechanism (not shown).
- the delivery position A0 is a position on the X-axis positive direction side and the Y-axis negative direction side of the rotary table 30, and a second delivery position A0 is on the Y-axis negative direction side.
- a cleaning unit 70, an alignment unit 50, and a first cleaning unit 60 are arranged.
- the alignment unit 50 and the first cleaning unit 60 are stacked and arranged in this order from above.
- the first machining position A1 is a position on the X-axis positive direction side and the Y-axis positive direction side of the rotary table 30, and the rough grinding unit 80 is arranged.
- the second machining position A2 is a position on the X-axis negative direction side and the Y-axis positive direction side of the rotary table 30, and the intermediate grinding unit 90 is arranged.
- the third machining position A3 is a position on the X-axis negative direction side and the Y-axis negative direction side of the rotary table 30, and the finish grinding unit 100 is arranged.
- a porous chuck is used for the chuck 31.
- the chuck 31 attracts and holds the back surface Sb of the second wafer S forming the polymerization wafer T.
- the surface of the chuck 31, that is, the holding surface of the polymerized wafer T has a convex shape in which the central portion thereof protrudes from the end portion in a side view. Since the protrusion at the center is very small, the convex shape of the chuck 31 is not shown in the following description.
- the chuck 31 is held by the chuck base 32.
- the four chuck bases located at the machining positions A1 to A3 and the delivery position A0 are used as the first chuck base 321 and the second chuck base 322 and the third chuck base, respectively. It may be called 323 or the fourth chuck base 324.
- the chuck bases 321 to 324 hold the chucks 311 to 314, respectively.
- the chuck base 32 is provided with an inclination adjusting unit 33 for adjusting the inclination of the chuck 31 and the chuck base 32 from the horizontal direction.
- the tilt adjusting unit 33 has a fixed shaft 34 and a plurality of elevating shafts 35 provided on the lower surface of the chuck base 32. Each elevating shaft 35 is configured to be expandable and contractible, and elevates and lowers the chuck base 32.
- the tilt adjusting portion 33 raises and lowers the other end of the chuck base 32 in the vertical direction by the elevating shaft 35 with one end (position corresponding to the fixed shaft 34) as the base point, thereby causing the chuck 31 and the chuck base. 32 can be tilted.
- the configuration of the inclination adjusting unit 33 is not limited to this, and can be arbitrarily selected as long as the relative angle (parallelism) of the first wafer W with respect to the grinding wheel can be adjusted.
- the transport unit 40 is an articulated robot provided with a plurality of, for example, three arms 41.
- Each of the three arms 41 is configured to be rotatable.
- a transport pad 42 that attracts and holds the polymerized wafer T is attached to the arm 41 at the tip.
- the arm 41 at the base end is attached to an elevating mechanism 43 that elevates and elevates the arm 41 in the vertical direction. Then, the transfer unit 40 having such a configuration can transfer the polymerization wafer T to the delivery position A0, the alignment unit 50, the first cleaning unit 60, and the second cleaning unit 70.
- the alignment unit 50 adjusts the horizontal orientation of the polymerized wafer T before grinding. For example, while rotating the polymerization wafer T held by the spin chuck (not shown), the position of the notch portion of the first wafer W is detected by the detection unit (not shown), so that the position of the notch portion can be determined. Adjust to adjust the horizontal orientation of the polymerization wafer T.
- the back surface Wb of the first wafer W after the grinding process is cleaned, more specifically, spin-cleaned.
- the cleaning liquid is supplied from the cleaning liquid nozzle (not shown) to the back surface Wb of the first wafer W. Then, the supplied cleaning liquid diffuses on the back surface Wb, and the back surface Wb is washed.
- the back surface Sb of the second wafer S in a state where the superposed wafer T after the grinding process is held by the transfer pad 42 is cleaned, and the transfer pad 42 is also cleaned.
- the rough grinding unit 80 roughly grinds the back surface Wb of the first wafer W.
- the rough grinding unit 80 has a rough grinding section 81.
- the rough grinding unit 81 includes a rough grinding wheel 82, a mount 83, a spindle 84, and a drive unit 85.
- the rough grinding wheel 82 is provided with a rough grinding wheel on the lower surface and has an annular shape.
- the rough grinding wheel 82 is supported by the mount 83.
- the mount 83 is provided with a drive unit 85 via a spindle 84.
- the drive unit 85 incorporates, for example, a motor (not shown) to rotate the rough grinding wheel 82 and move it in the vertical direction along the support column 86 shown in FIG.
- the chuck 31 and the rough grinding wheel 82 are brought into contact with each other in a state where the first wafer W of the polymerized wafer T held by the chuck 31 and a part of the arc of the rough grinding wheel 82 are in contact with each other.
- the back surface Wb of the first wafer W is roughly ground.
- the back surface Wb of the first wafer W is medium ground.
- the configuration of the medium grinding unit 90 is almost the same as the configuration of the rough grinding unit 80 as shown in FIGS. 3 and 5, and the medium grinding unit 91, the medium rough grinding wheel 92, the mount 93, the spindle 94, the drive unit 95 and It has a support 96.
- the particle size of the abrasive grains of the medium grinding wheel is smaller than the particle size of the abrasive grains of the coarse grinding wheel.
- the finish grinding unit 100 finish grinds the back surface Wb of the first wafer W.
- the configuration of the finish grinding unit 100 is almost the same as the configuration of the rough grinding unit 80 and the medium grinding unit 90, and the finish grinding unit 101, the finish grinding wheel 102, the mount 103, the spindle 104, and the drive It has a part 105 and a support column 106.
- the particle size of the abrasive grains of the finishing grinding wheel is smaller than the particle size of the abrasive grains of the medium grinding wheel.
- the processing station 3 is provided with thickness measuring units 110 and 120 for measuring the thickness of the first wafer W after the completion of the middle grinding and the thickness of the first wafer W after the completion of the finish grinding, respectively. ..
- the thickness measuring unit 110 is provided at, for example, the processing position A2 or the processing position A3.
- the thickness measuring unit 120 is provided at, for example, the processing position A3 or the delivery position A0.
- a thickness measuring mechanism (not shown) for detecting the end point of various grinding processes at each machining position is provided. When the thickness of the wafer W measured by the thickness measuring mechanism reaches the target thickness, the rotary table 30 is rotated to move the wafer W.
- the thickness measuring units 110 and 120 described above may be used as the thickness measuring mechanism for detecting the end point.
- the thickness measuring unit 110 as the first thickness distribution measuring unit has a sensor 111 and a calculation unit 112 as shown in FIG.
- the sensor 111 is, for example, a non-contact type sensor, and measures the thickness of the first wafer W before finish grinding.
- the sensor 111 measures the thickness of a plurality of points on the first wafer W.
- the measurement result of the sensor 111 is output to the calculation unit 112.
- the calculation unit 112 acquires the thickness distribution of the first wafer W from the measurement results (thickness of the first wafer W) at a plurality of points of the sensor 111. At this time, the TTV data of the first wafer W can be further calculated.
- the thickness of the first wafer W measured by the thickness measuring unit 110 is the thickness of the silicon portion of the first wafer W, and does not include the thickness of the device layer D and the surface film F.
- the thickness measuring unit 120 as the second thickness distribution measuring unit has substantially the same configuration as the thickness measuring unit 110, and has a sensor 121 and a calculation unit 122.
- the thickness measuring unit 120 acquires the thickness of the first wafer W after finish grinding by the sensor 121, and the calculation unit 122 calculates the TTV data.
- the thickness of the first wafer W is measured at a plurality of measurement points in the radial direction of the first wafer W. At each measurement point in the radial direction, the thickness of the first wafer W is measured at a plurality of points in the circumferential direction while rotating the layered wafer T. Then, the moving average value or the moving median value of the thickness measured at a plurality of points in the circumferential direction can be calculated, and the calculated value can be used as the thickness of the first wafer W at the measurement points in the radial direction.
- the thickness of the first wafer W at arbitrary designated coordinates is measured, and the measured thickness is a representative value. As a result, it may be used as the thickness of the first wafer W.
- the configurations of the thickness measuring units 110 and 120 are not limited to this embodiment, and can be arbitrarily selected as long as the thickness distribution of the first wafer W can be acquired and TTV data can be calculated. ..
- the above processing apparatus 1 is provided with a control unit 130.
- the control unit 130 is, for example, a computer equipped with a CPU, a memory, or the like, and has a program storage unit (not shown).
- the program storage unit stores a program that controls the processing of the polymerized wafer T in the processing apparatus 1. Further, the program storage unit also stores a program for controlling the operation of the drive system of the above-mentioned various processing units and transfer devices to realize the processing described later in the processing device 1.
- the program may be recorded on a computer-readable storage medium H and may be installed on the control unit 130 from the storage medium H.
- the first wafer W and the second wafer S are bonded to each other in an external bonding device (not shown) of the processing device 1, and a polymerization wafer T is formed in advance. Further, the peripheral edge portion of the first wafer W has been removed in advance.
- the cassette Ct containing the plurality of polymerized wafers T is placed on the cassette mounting table 10 of the loading / unloading station 2.
- the polymerized wafer T in the cassette Ct is taken out by the transfer fork 23 of the wafer transfer device 22, and is transferred to the alignment unit 50 of the processing station 3.
- the position of the notch portion of the first wafer W is adjusted while rotating the polymerization wafer T held by the spin chuck (not shown) as described above, so that the polymerization wafer T is in the horizontal direction.
- the orientation of is adjusted.
- the polymerized wafer T is conveyed from the alignment unit 50 to the delivery position A0 by the transfer unit 40, and is delivered to the chuck 31 at the delivery position A0. After that, the chuck 31 is moved to the first processing position A1. Then, the back surface Wb of the first wafer W is roughly ground by the rough grinding unit 80.
- the chuck 31 is moved to the second processing position A2. Then, the back surface Wb of the first wafer W is medium-ground by the medium-grinding unit 90.
- the finish grinding unit 100 finish grinds the back surface Wb of the first wafer W.
- the detailed method of finish grinding in this embodiment will be described later.
- the back surface Wb of the first wafer W is roughly cleaned by the cleaning liquid using a cleaning liquid nozzle (not shown). In this step, cleaning is performed to remove dirt on the back surface Wb to some extent.
- the polymerized wafer T is conveyed from the delivery position A0 to the second cleaning unit 70 by the transfer unit 40. Then, in the second washing unit 70, the back surface Sb of the second wafer S is washed and dried while the polymerization wafer T is held by the transport pad 42.
- the polymerized wafer T is conveyed from the second cleaning unit 70 to the first cleaning unit 60 by the transfer unit 40. Then, in the first cleaning unit 60, the back surface Wb of the first wafer W is finished and cleaned by the cleaning liquid using a cleaning liquid nozzle (not shown). In this step, the back surface Wb is washed and dried to a desired degree of cleanliness.
- the polymerized wafer T that has been subjected to all the processing is transferred to the cassette Ct of the cassette mounting table 10 by the transfer fork 23 of the wafer transfer device 22. Then, when the processing for all the polymerized wafers T in the cassette Ct is completed, a series of processing processes in the processing apparatus 1 are completed.
- the processing apparatus 1 the processing of the polymerized wafer T may be performed on a single sheet, that is, the processing of the other polymerized wafer T may be started after the processing of one polymerized wafer T is completed.
- the processing on the plurality of polymerized wafers T may be continuously performed, that is, the processing of the plurality of polymerized wafers T may be performed simultaneously in the processing apparatus 1.
- the plurality of polymerized wafers T housed in the cassette Ct are continuously processed. Then, in order to uniformly perform the grinding process in the processing apparatus 1 for each polymerized wafer T, that is, in order to uniformly control the thickness distribution of the first wafer W in each polymerized wafer T after finish grinding. Needs to consider the in-plane thickness distribution of the second wafer S as described above. Hereinafter, a finish grinding method for the first wafer W in consideration of the thickness distribution of the second wafer S in the processing apparatus 1 will be described.
- the nth polymerized wafer T processed in the processing apparatus 1 may be referred to as "polymerized wafer Tn".
- the first wafer W and the second wafer S constituting the nth polymerized wafer T may be referred to as “first wafer Wn” and “second wafer Sn”, respectively. is there.
- the processing apparatus 1 includes a thickness measuring unit 110 for acquiring the thickness distribution of the first wafer W before finish grinding and a first thickness after finish grinding. It has a thickness measuring unit 120 for acquiring the thickness distribution of the wafer W of 1 and further calculating the TTV.
- the thickness measuring units 110 and 120 measure the thickness of a plurality of points of the first wafer W by emitting IR light to the first wafer W, and the first wafer W is based on the measured thickness. Get the in-plane thickness distribution of. Further, the thickness measuring unit 120 calculates the TTV of the first wafer W after the finish grinding process based on the acquired in-plane thickness distribution.
- the IR light is emitted from, for example, above the polymerization wafer T held by the chuck 31, that is, from the first wafer W side with respect to the polymerization wafer T.
- the thickness measuring unit 110 can also be used to calculate the TTV of the first wafer W before the finish grinding process.
- the thickness measuring unit 110 of the first wafer W1 before finish grinding is measured, and the film thickness distribution data D1 as one thickness distribution is acquired.
- the acquired film thickness distribution data D1 is output to the control unit 130.
- the back surface W1b of the first wafer W1 is finish-ground by the finish grinding unit 100.
- the finish grinding of the first wafer W1 on the laminated wafer T1 it is detected based on the film thickness distribution data D1 so that the in-plane thickness of the first wafer W1 becomes uniform, that is, by the film thickness distribution data D1.
- the amount of grinding in the plane is determined so that the flatness of the first wafer W1 is improved. Specifically, the amount of finish grinding is increased at a position in the plane of the first wafer W1 where the thickness is determined to be large, and the amount of finish grinding is decreased at a position where the thickness is determined to be small.
- the thickness distribution of the polymerized wafer T1 is measured by the thickness measuring unit 120 at a plurality of points of the first wafer W1 after the finish grinding, and the film thickness distribution as the thickness distribution after the finish grinding. Acquire the data DD1.
- the acquired film thickness distribution data DD1 is output to the control unit 130.
- the first wafer W1 after the finish grinding is finish-ground based on the grinding amount determined based on the film thickness distribution data D1, so that the flatness of the first wafer W1 is improved, that is, It is desirable that the thickness of the first wafer W1 is uniform in the plane.
- the flatness of the first wafer W1 may not be improved as shown in FIG. 6B due to, for example, wear of the finishing grinding wheel, parallelism between the chuck 31 and the finishing grinding wheel, and other device characteristics. ..
- the difference data a between the film thickness distribution data D1 and the film thickness distribution data DD1 as the first difference data is acquired.
- the acquired difference data a is output to the control unit 130.
- the difference data a is acquired based on the film thickness distribution data D1 and DD1 acquired at the same point in the plane of the wafer W.
- the difference data a is the difference between the film thickness distribution data of the first wafer W before and after the finish grinding in the finish grinding unit 100.
- the difference data a it is possible to calculate the deterioration tendency of the flatness due to the device characteristics of the finish grinding unit 100.
- the tendency of deterioration of flatness due to the device characteristics is offset based on the difference data a.
- the amount of finish grinding is determined.
- the flatness of the first wafer W can be appropriately improved in the processing of the second and subsequent polymerized wafers T.
- the amount of finish grinding in the finish grinding unit 100 is adjusted by, for example, adjusting the relative inclination of the chuck base 32 with respect to the finish grinding wheel by the inclination adjusting unit 33.
- the polymerized wafer T1 from which the film thickness distribution data DD1 has been acquired is then subjected to the flatness of the first wafer W1 due to the device characteristics based on the acquired difference data a as shown in FIG. 6 (c).
- the first wafer W1 is regrinded so as to offset the deterioration tendency.
- the regrinding of the first wafer W1 is performed in the finish grinding unit 100. If there is no difference between the film thickness distribution data D1 and the film thickness distribution data DD1, that is, if there is no problem in the device characteristics of the finish grinding unit 100, the regrinding of the first wafer W1 is omitted. can do.
- the polymerized wafer T1 whose processing is completed is conveyed to the cassette Ct via the second cleaning unit 70 and the first cleaning unit 60. Then, the processing process for the second polymerized wafer T2 is started.
- the thickness measuring unit 110 measures the thickness of a plurality of points of the first wafer W2 before finish grinding, and the film thickness distribution data as one thickness distribution. Acquire D2. The acquired film thickness distribution data D2 is output to the control unit 130.
- the flatness of the first wafer W2 is improved by determining the finish grinding amount based on the grinding amount determined based on the difference data a, that is, the first wafer W2. It is desirable that the thickness of the wafer W2 is uniform in the plane. However, as shown in FIGS. 6A and 6D, when the shape characteristics of the second wafer S1 and the second wafer S2 are different, the first wafer W1 and the first wafer W2 are used. If grinding is performed under the same conditions, the flatness of the first wafer W2 may not be improved. Specifically, as shown in FIG.
- the difference data A between the film thickness distribution data D1 and the film thickness distribution data D2 as the second difference data is acquired.
- the acquired difference data A is output to the control unit 130.
- the difference data A is the difference between the film thickness distribution data of the first wafer W1 before the finish grinding and the first wafer W2 before the finish grinding in the finish grinding unit 100.
- the tendency of deterioration of flatness due to the shape characteristics of the second wafer S can be calculated.
- the chuck base 32 is formed so as to cancel the deterioration tendency of the flatness due to the shape characteristics based on the difference data A.
- the inclination is adjusted to determine the amount of finish grinding in the plane of the first wafer W2.
- the back surface W2b of the first wafer W2 is finish-ground by the finish grinding unit 100.
- the finish grinding of the first wafer W2 in addition to the inclination adjustment of the chuck base 32 based on the difference data a as described above, the inclination of the chuck base 32 is further corrected based on the difference data A, and the finish grinding amount is determined. Will be done. Thereby, in the processing of the second polymerized wafer T2, the flatness of the first wafer W2 can be appropriately improved.
- the thickness of the first wafer W2 after finish grinding is measured by the thickness measuring unit 120 of the polymerized wafer T2, and the film thickness distribution as the thickness distribution after finish grinding. Acquire the data DD2.
- the acquired film thickness distribution data DD2 is output to the control unit 130.
- the difference data b between the film thickness distribution data D2 and the film thickness distribution data DD2 as the first difference data is acquired.
- the acquired difference data b is output to the control unit 130.
- the difference data b is acquired based on the film thickness distribution data D2 and DD2 acquired at the same point in the plane of the wafer W.
- the difference data b is the difference between the film thickness distribution data of the first wafer W2 before and after the finish grinding in the finish grinding unit 100.
- the finish grinding unit 100 changes the device characteristics over time due to, for example, wear of the finish grinding wheel. Further, for example, the device characteristics may change with time due to environmental factors (for example, atmospheric temperature) when performing finish grinding. Therefore, in the grinding process according to the present embodiment, the inclination of the chuck base 32 is adjusted by following the deterioration tendency of the flatness due to the characteristics of the apparatus over time, and the finishing grinding amount is determined. As a result, the flatness of the first wafer W can be appropriately improved even in the processing of the third and subsequent laminated wafers T.
- the polymerized wafer T2 from which the film thickness distribution data DD2 has been acquired is then conveyed to the cassette Ct via the second cleaning unit 70 and the first cleaning unit 60.
- the third polymerized wafer T3 is taken out from the cassette Ct, and the processing process for the polymerized wafer T3 is started.
- the thickness measuring unit 110 measures the thickness of a plurality of points of the first wafer W3 before finish grinding, and the film thickness distribution data as one thickness distribution. Acquire D3. The acquired film thickness distribution data D3 is output to the control unit 130.
- the difference data B between the film thickness distribution data D1 and the film thickness distribution data D3 as the second difference data, which is the shape characteristic of the second wafer S3, is acquired.
- the acquired difference data B is output to the control unit 130.
- the difference data B may be the difference between the film thickness distribution data D2 and the film thickness distribution data D3 as long as the shape characteristics of the second wafer S3 can be acquired.
- the back surface W3b of the first wafer W3 is finish-ground by the finish grinding unit 100.
- the inclination of the chuck base 32 is adjusted based on the difference data b and the difference data B, and the finish grinding amount is determined.
- the flatness of the first wafer W3 can be appropriately improved. If no difference is found between the difference data a and the difference data b, that is, if there is no change in the device characteristics of the finish grinding unit 100, the difference data a is found in the finish grinding of the first wafer W3. , And the inclination may be adjusted based on the difference data B, that is, the finish grinding amount may be determined.
- the thickness of a plurality of points of the first wafer W3 after finish grinding is measured by the thickness measuring unit 120, and the film thickness distribution as the thickness distribution after finish grinding. Acquire the data DD3.
- the acquired film thickness distribution data DD3 is output to the control unit 130.
- the difference data c between the film thickness distribution data D3 and the film thickness distribution data DD3 as the first difference data is acquired.
- the acquired difference data c is output to the control unit 130.
- the difference data c is acquired based on the film thickness distribution data D3 and DD3 acquired at the same point in the plane of the wafer W.
- the second wafer S in each polymerized wafer T Difference data A, B, ..., which are differences in shape characteristics, are acquired. Then, since the inclination of the chuck base 32 is adjusted (corrected) based on the difference data to determine the finish grinding amount of the first wafer W, the finish thickness of the first wafer W can be uniformly controlled. That is, the flatness of the first wafer W can be appropriately improved.
- the shape characteristics of the second wafer S can be acquired only by measuring the thickness of the first wafer W by the thickness measuring unit 110 and the thickness measuring unit 120. That is, for example, even when the device layer D is formed on the surface Wa of the first wafer W and the total thickness of the polymerized wafer T or the thickness of the second wafer S cannot be measured, the second wafer is appropriately used.
- the shape characteristics of the wafer S can be acquired, and the flatness of the first wafer W can be improved.
- the difference data a which is the device characteristic of the finish grinding unit 100, is acquired based on the film thickness distribution data before and after the finish grinding of the first polymerized wafer T1. Then, in order to adjust (correct) the inclination of the chuck base 32 based on the difference data a and determine the finish grinding amount of the first wafer W, the finish thickness of the first wafer W is controlled more appropriately and uniformly. it can. That is, the flatness of the first wafer W can be further appropriately improved.
- the difference data b, c, ..., which are the device characteristics of the finish grinding unit 100 are acquired based on the film thickness distribution data before and after the finish grinding of the second and subsequent polymerized wafers Tn. ..
- the inclination of the chuck base 32 is adjusted (corrected) according to the time change of the device characteristics, and the first wafer is used. Since the finish grinding amount of W can be determined, the flatness of the first wafer W can be improved more appropriately.
- the difference data a which is the device characteristic of the finish grinding unit 100 was acquired at the time of processing the first polymerized wafer T1, but the difference data a can be used as, for example, a dummy polymerization substrate. It may be acquired in advance by grinding the polymerized wafer T0.
- the device characteristics in advance using the dummy substrate it is not necessary to acquire the device characteristics in the processing process of the first polymerized wafer T1 in the cassette Ct. That is, it is not necessary to perform the above-mentioned regrinding in the processing of the polymerized wafer T1, and the throughput required for the finish grinding of the polymerized wafer T1 can be improved.
- the chuck base 32 is tilted by the tilt adjusting unit 33 to adjust the finish grinding amount of the first wafer W, thereby improving the flatness of the first wafer W.
- the method for adjusting the finish grinding amount is not limited to this.
- the inclination adjusting unit 33 may adjust the finish grinding amount of the first wafer W by inclining the grinding wheel. Further, for example, if the finish grinding amount of the first wafer W can be adjusted, the inclination adjusting unit 33 may not be used.
- the film thickness distribution data before and after the finish grinding of the first wafer W1 is acquired, and the flatness of the first wafer W1 is adjusted based on the acquired film thickness distribution data.
- the adjustment of the flat portion may be performed at the time of rough grinding or medium grinding of the first wafer W1. That is, the film thickness distribution data before and after rough grinding and before and after medium grinding are further acquired, and based on the acquired film thickness distribution data, the relative inclination of the chuck base 32 with respect to the grinding wheel during rough grinding and medium grinding is determined. You may adjust.
- the technique according to the present disclosure can be suitably applied not only when the polymerized wafer T has a metal film but also in any case where the thickness of the second wafer S cannot be calculated appropriately.
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Abstract
Description
100 仕上研削ユニット
110 厚み測定部
130 制御部
W 第1のウェハ
S 第2のウェハ
T 重合ウェハ
Claims (10)
- 第1の基板と第2の基板が接合された重合基板において、粗研削された前記第1の基板を基板処理装置において仕上研削処理する方法であって、
前記基板処理装置においては複数の重合基板が連続的に処理され、
一の重合基板における仕上研削前の第1の基板の一の厚み分布を測定することと、
他の重合基板における仕上研削前の第1の基板の他の厚み分布を測定することと、
前記一の厚み分布と前記他の厚み分布との第1の差分データに基づいて、前記他の重合基板を保持する基板保持部と、前記重合基板を仕上研削する研削部との相対的な傾きを決定することと、
決定された前記傾きで前記他の重合基板を保持した状態で、前記他の重合基板における第1の基板を仕上研削することと、を含む基板処理方法。 - 前記一の重合基板における仕上研削後の第1の基板の厚み分布を測定することを含み、
前記他の重合基板を保持する前記基板保持部と前記研削部との相対的な傾きは、
前記第1の差分データに加え、
前記一の重合基板における仕上研削前の第1の基板の一の厚み分布と前記一の重合基板における仕上研削後の第1の基板の厚み分布との第2の差分データに基づいて決定される、請求項1に記載の基板処理方法。 - 前記一の重合基板は、前記基板処理装置において前記複数の重合基板の処理よりも前に処理されるダミーの重合基板である、請求項1または2に記載の基板処理方法。
- 前記一の重合基板は、前記複数の重合基板のうち、前記他の重合基板よりも前に処理される重合基板である、請求項1又は2に記載の基板処理方法。
- 前記一の重合基板が、前記複数の重合基板のうち、前記基板処理装置において1枚目に処理される重合基板である場合において、
前記一の重合基板における仕上研削後の第1の基板の厚み分布を測定することと、
前記一の重合基板における仕上研削前の第1の基板の一の厚み分布と当該一の重合基板における仕上研削後の第1の基板の厚み分布との第2の差分データに基づいて前記一の重合基板を保持する前記基板保持部と前記研削部との相対的な傾きを決定し、前記一の重合基板における第1の基板を再研削することと、を含む、請求項4に記載の基板処理方法。 - 第1の基板と第2の基板が接合された重合基板において、当該第1の基板を研削処理する基板処理装置であって
前記重合基板を保持する基板保持部と、
粗研削された前記第1の基板を仕上研削する仕上研削部と、
仕上研削前の前記第1の基板の厚み分布を測定する第1の厚み分布測定部と、
前記仕上研削部の動作を制御する制御部と、を備え、
前記制御部は、前記基板処理装置において複数の重合基板を連続的に処理し、
一の重合基板における仕上研削前の第1の基板の一の厚み分布と、
他の重合基板における仕上研削前の第1の基板の他の厚み分布と、
の差分である第1の差分データに基づいて、前記他の重合基板の仕上研削時における前記基板保持部と前記仕上研削部との相対的な傾きを決定する、基板処理装置。 - 仕上研削後の前記第1の基板の厚み分布を測定する第2の厚み分布測定部を備え、
前記制御部は、前記第1の差分データに加え、
前記一の重合基板における仕上研削前の第1の基板の一の厚み分布と、
一の重合基板における仕上研削後の第1の基板の厚み分布と、
の差分である第2の差分データに基づいて、前記他の重合基板を保持する前記基板保持部と前記仕上研削部との相対的な傾きを決定する、請求項6に記載の基板処理装置。 - 前記一の重合基板は、前記基板処理装置において前記複数の重合基板の処理よりも前に処理されるダミーの重合基板である、請求項6または7に記載の基板処理装置。
- 前記一の重合基板は、前記複数の重合基板のうち、前記他の重合基板よりも前に処理される重合基板である、請求項6又は7に記載の基板処理装置。
- 仕上研削後の前記第1の基板の厚み分布を測定する第2の厚み分布測定部を備え、
前記制御部は、前記一の重合基板が、前記複数の重合基板のうち1枚目に処理される重合基板である場合において、
前記一の重合基板における仕上研削前の第1の基板の一の厚み分布と、
一の重合基板における仕上研削後の第1の基板の厚み分布と、
の差分である第2の差分データに基づいて前記一の重合基板を保持する基板保持部と前記仕上研削部との相対的な傾きを決定し、前記一の重合基板における第1の基板を再研削することと、を含む、請求項9に記載の基板処理装置。
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JP2011245610A (ja) * | 2010-05-31 | 2011-12-08 | Mitsubishi Electric Corp | 半導体装置の製造方法 |
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JP2017094418A (ja) * | 2015-11-19 | 2017-06-01 | 株式会社ディスコ | 研削装置 |
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