WO2015136840A1 - 両面研磨装置用キャリアの製造方法及び両面研磨装置用キャリア並びに両面研磨方法 - Google Patents
両面研磨装置用キャリアの製造方法及び両面研磨装置用キャリア並びに両面研磨方法 Download PDFInfo
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- WO2015136840A1 WO2015136840A1 PCT/JP2015/000662 JP2015000662W WO2015136840A1 WO 2015136840 A1 WO2015136840 A1 WO 2015136840A1 JP 2015000662 W JP2015000662 W JP 2015000662W WO 2015136840 A1 WO2015136840 A1 WO 2015136840A1
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- Prior art keywords
- carrier
- double
- polishing apparatus
- side polishing
- hole
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- 238000005498 polishing Methods 0.000 title claims abstract description 177
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 32
- 239000004065 semiconductor Substances 0.000 claims abstract description 44
- 239000000463 material Substances 0.000 claims description 12
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 9
- 239000010936 titanium Substances 0.000 claims description 9
- 229910052719 titanium Inorganic materials 0.000 claims description 9
- 229910001220 stainless steel Inorganic materials 0.000 claims description 6
- 239000010935 stainless steel Substances 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 229910001315 Tool steel Inorganic materials 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 4
- 239000004744 fabric Substances 0.000 claims description 2
- 238000009826 distribution Methods 0.000 abstract description 33
- 235000012431 wafers Nutrition 0.000 description 40
- 230000000052 comparative effect Effects 0.000 description 17
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 10
- 229910052710 silicon Inorganic materials 0.000 description 10
- 239000010703 silicon Substances 0.000 description 10
- 230000002093 peripheral effect Effects 0.000 description 8
- 238000005259 measurement Methods 0.000 description 6
- 239000002002 slurry Substances 0.000 description 5
- 238000006073 displacement reaction Methods 0.000 description 4
- NIPNSKYNPDTRPC-UHFFFAOYSA-N N-[2-oxo-2-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)ethyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 NIPNSKYNPDTRPC-UHFFFAOYSA-N 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 239000004760 aramid Substances 0.000 description 2
- 229920003235 aromatic polyamide Polymers 0.000 description 2
- 239000000969 carrier Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B37/00—Lapping machines or devices; Accessories
- B24B37/04—Lapping machines or devices; Accessories designed for working plane surfaces
- B24B37/07—Lapping machines or devices; Accessories designed for working plane surfaces characterised by the movement of the work or lapping tool
- B24B37/08—Lapping machines or devices; Accessories designed for working plane surfaces characterised by the movement of the work or lapping tool for double side lapping
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B37/00—Lapping machines or devices; Accessories
- B24B37/11—Lapping tools
- B24B37/20—Lapping pads for working plane surfaces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B37/00—Lapping machines or devices; Accessories
- B24B37/27—Work carriers
- B24B37/28—Work carriers for double side lapping of plane surfaces
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02002—Preparing wafers
- H01L21/02005—Preparing bulk and homogeneous wafers
- H01L21/02008—Multistep processes
- H01L21/0201—Specific process step
- H01L21/02024—Mirror polishing
-
- 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
- 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
- H01L21/6835—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 using temporarily an auxiliary support
Definitions
- the present invention relates to a method for manufacturing a carrier for a double-side polishing apparatus, a carrier for a double-side polishing apparatus, and a double-side polishing method.
- a disc-shaped carrier for a double-side polishing apparatus provided with a holding hole for holding a semiconductor wafer is generally used (Patent Document 1). reference).
- the thickness of one carrier body is not the average value but the range of all data (difference between the maximum value and the minimum value), the range becomes as large as 3 ⁇ m and has a characteristic thickness distribution. I found out.
- This characteristic distribution means the central portion of the carrier body (the central portion means the portion closest to the center of the peripheral portion of the work hole when the center of the carrier body is included in the work hole storing the workpiece. .) Is a distribution that is thicker than other parts.
- the insert thickness needs to be uniform in the circumferential direction of the work hole in order to make the semiconductor wafer highly flat.
- the thickness of the insert becomes non-uniform due to the carrier body thickness distribution, and the semiconductor wafer is flat. Deterioration of the degree will be invited. Nevertheless, no technology has been developed so far to cope with the thickness distribution of the carrier body, particularly the thickness of the center of the carrier body, which is thicker than other parts.
- the present invention has been made in view of the above-described problems, and a method of manufacturing a carrier for a double-side polishing apparatus and a double-side polishing apparatus capable of improving the variation in thickness distribution that occurs when the carrier for a double-side polishing apparatus is wrapped. Another object is to provide a double-side polishing method using the carrier for carrier and the carrier for double-side polishing apparatus.
- the double-side polishing apparatus is configured such that a carrier for a gear-shaped double-side polishing apparatus having a holding hole for holding a semiconductor wafer is sandwiched between upper and lower surface plates of a wrapping apparatus.
- a method of manufacturing a carrier for a double-side polishing apparatus by lapping by revolving and rotating a carrier for a carrier, and having a hole for holding the carrier for a double-side polishing apparatus, which is larger than the carrier for a double-side polishing apparatus
- a gear-shaped outer carrier of a size is prepared, and the outer carrier is decentered with respect to the center of the outer carrier, and the outer carrier is accommodated in the hole by storing the carrier for the double-side polishing apparatus in the hole.
- the carrier for the double-side polishing apparatus is held by a carrier, and the center of the hole is opposite to the center of the outer carrier.
- the carrier for the double-side polishing apparatus is rotated and revolved while the held carrier for the double-side polishing apparatus is sandwiched between the upper and lower surface plates of the wrapping apparatus in an eccentric state.
- a method for manufacturing a carrier for a double-side polishing apparatus is provided.
- the carrier for a double-side polishing apparatus that suppresses the thickness distribution that has conventionally occurred in the lapping process, in particular, the distribution in which the center portion of the carrier body becomes thicker than other portions, and the thickness variation is suppressed to be small. Can be manufactured.
- the shape of the hole is circular, and the amount of eccentricity of the center of the hole with respect to the center of the outer carrier is 1/5 or more of the diameter of the hole. In this way, it is possible to manufacture a carrier for a double-side polishing apparatus in which the thickness variation is suppressed to be small, and the thickness range is particularly suppressed to 2 ⁇ m or less.
- the shape of the hole can be made circular, and the diameter of the hole can be made 0.5 mm to 1.0 mm larger than the diameter of the tooth tip circle of the carrier for the double-side polishing apparatus.
- the outer carrier does not hinder the rotation of the carrier for the double-side polishing apparatus in the hole. Can be manufactured.
- the tip circle diameter of the outer carrier is 1.5 times or more of the tip circle diameter of the carrier for the double-side polishing apparatus. In this way, it is possible to manufacture a carrier for a double-side polishing apparatus in which the thickness variation is suppressed to be small, and the thickness range is particularly suppressed to 2 ⁇ m or less.
- the material of the outer carrier may be carbon tool steel, stainless steel, or titanium. These materials are suitable for the material of the outer carrier.
- the material of the carrier for a double-side polishing apparatus can be stainless steel or titanium. These materials are suitable as the material for the carrier for the double-side polishing apparatus.
- the carrier for double-side polish apparatuses manufactured with said manufacturing method is provided.
- Such a carrier for a double-side polishing apparatus has a thickness range of 2 ⁇ m or less, for example, and has a small variation in thickness distribution, so that it becomes a carrier for a double-side polishing apparatus capable of manufacturing a highly flat semiconductor wafer.
- the double-side polishing apparatus while holding the semiconductor wafer by using the carrier for the double-side polishing apparatus, Provided is a semiconductor wafer double-side polishing method for polishing both sides of a semiconductor wafer by sliding the upper and lower surfaces of the held semiconductor wafer.
- a highly flat semiconductor wafer can be manufactured by the double-side polishing method using the carrier for a double-side polishing apparatus having a small variation in thickness distribution as described above.
- the present invention can produce a carrier for a double-side polishing apparatus with a small variation in thickness distribution, and a double-side polishing using this carrier for a double-side polishing apparatus can obtain a semiconductor wafer that is flatter than before.
- the present invention is not limited to this.
- the center portion of the carrier body has been thickened.
- the thickness of the insert to be fitted in the subsequent process also varies.
- such a carrier for a double-side polishing apparatus having a non-uniform thickness of the insert or carrier body is used for double-side polishing of a semiconductor wafer, there is a problem that the flatness of the semiconductor wafer deteriorates.
- the present inventors investigated the cause of the above-described thickness variation that occurs in the lapping process of the carrier for a double-side polishing apparatus.
- the distribution of the thickening of the center portion of the carrier for the double-side polishing apparatus is caused by the work hole of the carrier for double-side polishing apparatus (the hole for housing the semiconductor wafer) being eccentric from the center of the carrier for double-side polishing apparatus.
- the center portion was found to have a smaller distance (eccentricity) from the center of the carrier for the double-side polishing apparatus than the other portions.
- FIG. 6B shows the distance to the center of the peripheral edge of the work hole 22.
- the relationship between the amount of eccentricity (distance from the center) X and the thickness displacement Y in the carrier for the double-side polishing apparatus having such a size is obtained by fitting the measured values (curve regression) as shown in FIG. 1).
- the present inventors hold the carrier for a double-side polishing apparatus with a holding member, and rotate and revolve together with the holding member. I came up with a lapping process.
- a hole having a hole for storing the carrier for the double-side polishing apparatus, and the center of the hole being eccentric with respect to the center of the holding member hereinafter, this holding member is referred to as an outer carrier.
- the amount of eccentricity of the center of the hole with respect to the center of the outer carrier is superimposed on the amount of eccentricity of the carrier for the lapping target double-side polishing apparatus, so that the amount of eccentricity necessary for uniform thickness distribution can be secured.
- the present invention has been completed.
- a method for manufacturing a carrier for a double-side polishing apparatus a carrier for a double-side polishing apparatus, and a double-side polishing method of the present invention will be described.
- a method for manufacturing a carrier for a double-side polishing apparatus according to the present invention will be described with reference to the case where the lapping apparatus shown in FIG. 1 is used.
- the carrier for the double-side polishing apparatus to be lapped is a 20B (tooth diameter 525 mm) size
- the carrier for the lapping apparatus of 32B (tooth diameter 814 mm) size is used as the outer carrier.
- the present invention is not limited to this.
- the lapping apparatus 10 includes an upper surface plate 11, a lower surface plate 12, a sun gear 13, an internal gear 14, and a nozzle 15.
- a sun gear 13 is provided at the center of the lower surface plate 12, and an internal gear 14 is provided adjacent to the peripheral edge of the lower surface plate 12.
- the nozzle 15 supplies the slurry 16 between the upper and lower surface plates 11 and 12 from a hole provided in the upper surface plate 11 during lapping.
- an outer carrier 1 as shown in FIGS. 1, 2, and 3 is prepared.
- the outer carrier 1 has a hole 2 for holding the carrier W for a double-side polishing apparatus, and the center C 2 of the hole 2 is eccentric with respect to the center C 1 of the outer carrier 1 as shown in FIG. Prepare and use it.
- the material of the outer carrier 1 can be carbon tool steel, stainless steel, or titanium. These materials are suitable for lapping because of their high wear resistance.
- the outer carrier 1 is engaged with the sun gear 13 and the internal gear 14 of the lapping device 10, and the carrier W for the double-side polishing apparatus is stored and held in the hole 2 of the outer carrier 1.
- the outer carrier 1 by engaging the outer carrier 1 with the sun gear 13 and the internal gear 14, these gears are rotated, and planetary motion (rotation) around the sun gear 13 is caused by the outer carrier 1 and the carrier W for the double-side polishing apparatus. And revolving motion).
- both surfaces of the carrier W for the double-side polishing apparatus are sandwiched between the upper surface plate 11 and the lower surface plate 12, and the slurry 16 is supplied from the nozzle 15.
- the upper surface plate 11 and the lower surface plate 12 are rotated in relative directions.
- the eccentric amount of the outer carrier 1 is superimposed on the eccentric amount of the original carrier W for double-side polishing apparatus, and the thickness distribution is made uniform. The necessary eccentricity will be ensured. As a result, variation in the thickness distribution of the carrier W for double-side polishing apparatus is eliminated, and a carrier for double-side polishing apparatus having high thickness uniformity can be obtained.
- the tooth tip circle diameter of the outer carrier 1 is 1.5 times or more of the tooth tip circle diameter of the carrier W for double-side polishing apparatus. If it does in this way, the carrier for double-side polish apparatuses which suppressed the thickness range to 2 micrometers or less can be manufactured.
- the shape of the hole 2 is circular, and the amount of eccentricity of the center of the hole 2 with respect to the center of the outer carrier 1 is 1/5 or more of the diameter of the hole 2. If it does in this way, the carrier for double-side polish apparatuses which suppressed the thickness range to 2 micrometers or less can be manufactured. Hereinafter, these reasons will be described.
- the thickness range of the carrier W for a double-side polishing apparatus is desirably 2 ⁇ m or less.
- a carrier for a double-side polishing apparatus to be wrapped is a 20B (tooth tip diameter 525 mm) size and a carrier for a lapping apparatus 32B (tip tip diameter 814 mm) size is used as an outer carrier
- the eccentricity amount X necessary for setting the thickness range Y ⁇ 2 ⁇ m is about 180 mm.
- FIG. 6B An example of a general carrier for a double-side polishing apparatus having a 20B size and an eccentricity of 85 to 90 mm with respect to the center of the work hole 22 as shown in FIG. 6A is shown in FIG. 6B.
- the minimum distance from the center of the carrier for the double-side polishing apparatus to the periphery of the work hole is about 70 mm. Therefore, when the center C 1 and the outer carrier 1 and the center C 2 of the holes 2 is about 110mm eccentricity of the outer carrier 1 as shown in FIG. 3, the eccentricity amount of total 2 ⁇ m below about 180mm next Thickness Range And can.
- a carrier for a lapping device having a tip circle diameter of 814 mm (32B size) as an outer carrier as in this example.
- the root diameter can be 49/50 with respect to the tip diameter
- the outer carrier 1 is selected, the difference between the radius of the outer carrier 1 and the radius of the hole 2 can be referred to.
- the outer carrier 1 when wrapping the double-side polishing machine carrier W having a size of 20B (tooth tip diameter 525 mm), the outer carrier 1 is preferably 32B (tip tip diameter 814 mm) or more. That is, not only in this case but also in other cases, the thickness range is set to 2 ⁇ m or less by setting the tooth tip circle diameter of the outer carrier 1 to 1.5 times or more of the tooth tip circle diameter of the carrier for the double-side polishing apparatus. The amount of eccentricity can be ensured.
- the center of the hole 2 can be offset by 110 mm or more from the center of the carrier to achieve a thickness range of 2 ⁇ m or less. That is, not limited to this case, the amount of eccentricity of the center of the hole 2 with respect to the center of the outer carrier 1 is the diameter of the hole 2 that houses the double-side polishing apparatus carrier W (in this case, the teeth of the double-side polishing apparatus carrier W). By setting it to 1/5 or more of about 525.5 mm, which is substantially the same as the diameter of the tip circle, it is possible to secure an eccentric amount that satisfies a thickness range of 2 ⁇ m or less.
- the shape of the hole 2 is preferably circular, and the diameter of the hole 2 is preferably 0.5 mm to 1.0 mm larger than the diameter of the tooth tip circle of the carrier W for a double-side polishing apparatus.
- the double-side polishing apparatus carrier W is placed in the hole 2. Since the rotation is not hindered, a carrier for a double-side polishing apparatus with little thickness variation can be reliably manufactured.
- the material of the carrier W for a double-side polishing apparatus can be stainless steel or titanium.
- the manufacturing method of the present invention is particularly suitable for manufacturing a carrier W for a double-side polishing apparatus made of these materials.
- the lapping condition may be a general condition
- the slurry 16 may be a general one such as GC # 2000 and finished to a predetermined thickness with a predetermined pressure.
- the resin thickness is set by fitting it into the inner peripheral portion of the work hole 22 while pressing the resin insert made of EG (glass epoxy resin) or aramid. Polishing of the finish for aligning may be performed, and the carrier W for double-side polish apparatuses may be produced.
- the double-side polishing apparatus carrier W manufactured by the manufacturing method of the present invention as described above is a double-side polishing apparatus carrier having almost no variation in thickness distribution after lapping and high flatness. If it is such, when it uses for double-sided grinding
- the upper and lower surfaces of the semiconductor wafer held on the upper and lower surface plates to which the polishing cloth is attached are slidably contacted while holding the semiconductor wafer using the carrier W for the double-side polishing apparatus.
- a highly flat semiconductor wafer can be manufactured by the double-side polishing method using the carrier for a double-side polishing apparatus having a small thickness variation as described above.
- a case where a carrier for a double-side polishing apparatus having a size of 20B is used as a target for lapping and a carrier for a lapping apparatus having a size of 32B is used as an outer carrier is described as an example.
- the object of the lapping process is not limited to the above-mentioned size, and the outer carrier is as described above as long as the center of the hole for storing the object of the lapping process is eccentric with respect to the center of the outer carrier. It is not necessary to use a wrapping device carrier.
- Example 1 A titanium double-side polishing apparatus carrier having a size of 20B (tooth diameter 525 mm, root diameter 515 mm) was lapped on both sides with a lapping apparatus as shown in FIGS. At this time, a wrapping device carrier made of carbon tool steel having a size of 32B (tooth tip diameter 814 mm, tooth bottom circle diameter 797.7 mm) was used as an outer carrier. Further, the hole of the outer carrier was a circle having a diameter of 525.5 mm. At this time, the eccentricity of the center of the hole with respect to the center of the outer carrier was 110 mm. The slurry was lapped to a constant thickness under a constant load condition using GC # 2000. Table 1 shows the conditions of the carrier for the double-side polishing apparatus and the outer carrier to be lapped at this time.
- the flatness distribution of the carrier for a double-sided polishing apparatus made of titanium after lapping was measured.
- the flatness distribution of the peripheral part of a work hole was measured using the laser displacement meter by KEYENCE company for the measurement.
- the results are shown in FIG. Note that the angle of the horizontal axis of the graph of FIG. 4 indicates the angle of the measurement portion at the peripheral edge of the work hole, as in FIGS. 6 (a) and 6 (b).
- the flatness distribution after the lapping process was uniform without the central portion (around 180 °) being extremely thicker than the other portions as in the comparative example described later. Further, the thickness range was 1.12 ⁇ m, and the thickness deviation (thickness variation) was 0.30 ⁇ m, which was a significantly better value than the comparative example.
- an insert having an inner diameter of 300.5 mm made of aramid resin was fitted into the inner periphery of the work hole of the carrier for a double-sided polishing machine made of titanium after lapping.
- the inserts were fitted together while being pressed, and finish polishing was performed to align the thickness of the insert with the thickness of the carrier for a double-side polishing apparatus, thereby producing a carrier for a double-side polishing apparatus.
- double-side polishing of a semiconductor silicon wafer having a diameter of 300 mm was performed.
- DSP-20B manufactured by Fujikoshi Machine, MH-S15A manufactured by Nitta Haas, and GLANZOX2100 manufactured by Fujimi Incorporated were used as the polishing slurry.
- the number of wafers processed per batch was 5, and 10 batches were processed each.
- ESFQR Edge Site frontier referenced squares / Range
- Table 3 shows the flatness measurement results of the semiconductor silicon wafer.
- ESFQRmax was 31.24 nm
- ESFQRsigma (deviation) was 5.07.
- the ESFQR was improved by 10% in average value and the deviation was improved by about 50% compared with the comparative example, and the flatness was good.
- Example 2 A 20B double-sided polishing apparatus carrier was lapped under the same conditions as in Example 1 except that the eccentricity of the center of the hole with respect to the center of the outer carrier was 90 mm, and the flatness distribution was measured.
- Table 1 shows the conditions of the carrier for the double-side polishing apparatus and the outer carrier to be lapped at this time.
- the measurement result of the flatness distribution after lapping is shown in FIG. As shown in FIG. 4, the flatness distribution after the lapping process was uniform without the central portion being extremely thicker than the other portions as in the comparative example described later. Further, the thickness range was 1.75 ⁇ m, and the thickness deviation (thickness variation) was 0.46 ⁇ m, which was a favorable value compared to the comparative example.
- the insert was fitted into the carrier for a double-side polishing apparatus after lapping in the same manner as in Example 1. Thereafter, using this carrier for a double-side polishing apparatus, double-side polishing of the semiconductor silicon wafer was performed in the same manner as in Example 1, and the ESFQR of the polished semiconductor silicon wafer was measured.
- the results are shown in Table 3. Compared with the comparative example, the maximum value of ESFQR was 33.00 nm, and the deviation (variation) was as small as 7.56, and the flatness of the semiconductor wafer was greatly improved.
- Example 3 Other than changing the outer carrier to a carrier for lapping device of size 30B (tip circle diameter 743.8 mm, root circle diameter 730.8 mm) and setting the eccentric amount of the center of the hole to the center of the outer carrier to 90 mm, Under the same conditions as in Example 1, a carrier for a double-side polishing apparatus having a size of 20B was lapped, and the flatness distribution was measured. Table 1 shows the conditions of the carrier for the double-side polishing apparatus and the outer carrier to be lapped at this time. Moreover, the measurement result of the flatness distribution after lapping is shown in FIG. As shown in FIG. 4, the flatness distribution after the lapping processing was uniform without the central portion becoming extremely thicker than the other portions as in the comparative example described later. Moreover, the thickness range was 1.96 ⁇ m, and the thickness deviation was 0.39 ⁇ m, which was a favorable value compared to the comparative example.
- the insert was fitted into the carrier for a double-side polishing apparatus after lapping in the same manner as in Example 1. Thereafter, using this carrier for a double-side polishing apparatus, double-side polishing of the semiconductor silicon wafer was performed in the same manner as in Example 1, and the ESFQR of the polished semiconductor silicon wafer was measured.
- the results are shown in Table 3. Compared with the comparative example, the maximum value of ESFQR was 33.17 nm and the variation (deviation) was as small as 7.9 nm, and the flatness of the semiconductor wafer was greatly improved.
- the double-side polishing apparatus carrier W to be lapped is not held by the outer carrier, but is directly meshed with the sun gear 113 and the internal gear 114 of the lapping apparatus 110 and lapped.
- the carrier for a double-side polishing apparatus was lapped under the conditions, and the flatness distribution was measured.
- Table 1 shows the conditions of the carrier for the double-side polishing apparatus and the outer carrier to be lapped at this time.
- the measurement result of the flatness distribution after lapping is shown in FIG.
- the center part of the carrier for a double-side polishing apparatus was thick.
- the thickness range was 3.04 ⁇ m, and the thickness variation was 0.81 ⁇ m, which was significantly worse than that of Example 1-3.
- Example 3 the insert was fitted into the carrier for a double-side polishing apparatus after lapping in the same manner as in Example 1. Thereafter, using this carrier for a double-side polishing apparatus, double-side polishing of the semiconductor silicon wafer was performed in the same manner as in Example 1, and the ESFQR of the polished semiconductor silicon wafer was measured. The results are shown in Table 3. In the comparative example, the maximum value of ESFQR was 40.04 nm and the variation (deviation) was 12.03 nm, and the flatness of the semiconductor wafer was significantly deteriorated as compared with Example 1-3.
- Table 4 summarizes the conditions of the examples and comparative examples, the measured values of the thickness range of the carrier for a double-side polishing apparatus after lapping, and the ESFQR of the semiconductor wafer after double-side polishing.
- Example 1-3 As described above, in Examples 1-3 to which the manufacturing method of the present invention was applied, the variation and range of the thickness distribution of the carrier for the double-side polishing apparatus were significantly improved as compared with the comparative example. Further, the double-side polishing using the carrier for the double-side polishing apparatus produced in Example 1-3 significantly improved the flatness of the semiconductor wafer.
- Example 2 although the eccentric amount of the center of the hole with respect to the center of the outer carrier is not 1/5 or more of the diameter of the hole, the diameter of the tip of the outer carrier is the tip of the tip of the carrier for the double-side polishing apparatus. Since the diameter was 1.5 times or more, the result was even better than Example 3.
- the present invention is not limited to the above embodiment.
- the above-described embodiment is an exemplification, and the present invention has any configuration that has substantially the same configuration as the technical idea described in the claims of the present invention and that exhibits the same effects. Are included in the technical scope.
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Abstract
Description
このようにすれば、より厚みバラツキが小さく抑えられ、特に厚みレンジが2μm以下に抑えられた両面研磨装置用キャリアを製造することができる。
このようにすれば、両面研磨装置用キャリアのラッピングの際に、アウターキャリアがホール内での両面研磨装置用キャリアの自転を阻害することが無いため、厚みバラツキが少ない両面研磨装置用キャリアを確実に製造することができる。
このようにすれば、より厚みバラツキが小さく抑えられ、特に厚みレンジが2μm以下に抑えられた両面研磨装置用キャリアを製造することができる。
アウターキャリアの材質としてはこれらの材料が好適である。
両面研磨装置用キャリアの材質としてはこれらの材料が好適である。
このような両面研磨装置用キャリアであれば、例えば厚みレンジが2μm以下のものであり、厚み分布のバラツキが小さいので、高平坦な半導体ウェーハを製造可能な両面研磨装置用キャリアとなる。
上述のように、従来、両面研磨装置用キャリアをラッピング加工する場合に、キャリアボディの中央部が厚くなってしまっていた。このように、キャリアボディに厚み分布のバラツキが有ると、後工程で嵌め込むインサートの厚みにもバラツキが生まれてしまう。このようなインサートやキャリアボディの厚さが不均一な両面研磨装置用キャリアを半導体ウェーハの両面研磨に使用すると、半導体ウェーハの平坦度が悪化するという問題があった。
その結果、両面研磨装置用キャリアの中央部が厚くなる分布を形成する原因は、両面研磨装置用キャリアのワークホール(半導体ウェーハを収納する穴)が両面研磨装置用キャリアの中心から偏芯しており、ラッピング加工時において、中央部は両面研磨装置用キャリアの中心からの距離(偏芯量)が他の部分に比べて少ないためであることを発見した。
Y=-7×10-5×X2+0.0106X+2.4102 ・・・ 式(1)
まず、本発明の両面研磨装置用キャリアの製造方法を、図1に示したラッピング装置を使用する場合を例にして説明する。また、ここでは、ラッピング対象の両面研磨装置用キャリアは、20B(歯先直径525mm)サイズのものを、アウターキャリアとして32B(歯先円直径814mm)サイズのラッピング装置用キャリアを使用した場合を例にして説明するが、これに限定されることはない。
下定盤12上の中心部分にはサンギア13が設けられ、下定盤12の周縁部に隣接するようにインターナルギア14が設けられている。また、ノズル15はラッピング加工時に、上定盤11に設けられた穴から上下定盤11、12の間にスラリー16を供給する。
これらの材料は、耐摩耗性が高いためラッピング加工に好適である。
このようにして、アウターキャリア1をサンギア13とインターナルギア14に噛合することで、これらのギアをそれぞれ自転させ、アウターキャリア1と両面研磨装置用キャリアWにサンギア13を中心とした遊星運動(自転及び公転運動)をさせることができる状態となる。
このようにすれば、厚みレンジを2μm以下に抑えた両面研磨装置用キャリアを製造することができる。
このようにすれば、厚みレンジを2μm以下に抑えた両面研磨装置用キャリアを製造することができる。
以下、これらの理由を説明する。
したがって、図3に示すようなアウターキャリア1の中心C1とホール2の中心C2を約110mm偏芯させたアウターキャリア1を用いれば、合計の偏芯量は約180mmとなり厚みレンジを2μm以下とできる。
キャリアと噛合するピンギアサイズにもよるが、歯底円直径は歯先円直径に対して49/50とすることができ、32Bサイズの歯底円直径は797.7mmとできる。従って、アウターキャリアが重畳可能な偏芯量を計算すると(797.7-525)÷2=136.4mmであり110mmを充分にカバーできる。
このように、アウターキャリア1を選択する際には、アウターキャリア1の半径とホール2の半径の差を参照することができる。
このように、ラッピングする両面研磨装置用キャリアWと、これを収納、保持するホール2の内周に0.5mm~1.0mmの遊びがあれば、両面研磨装置用キャリアWがホール2内で自転するのを阻害しないため、厚みバラツキが少ない両面研磨装置用キャリアを確実に製造することができる。
本発明の製造方法は、特にこれらの材質の両面研磨装置用キャリアWの製造に好適である。
このようなものであれば、両面研磨装置にて半導体ウェーハの両面研磨に使用した際に、半導体ウェーハの平坦度を良好なものとできる。
20B(歯先円直径525mm、歯底円直径515mm)サイズのチタン製の両面研磨装置用キャリアを、図1、図2に示すようなラッピング装置で両面をラッピング加工した。
このとき、アウターキャリアとして32B(歯先円直径814mm、歯底円直径797.7mm)サイズの炭素工具鋼製のラッピング装置用キャリアを使用した。また、このアウターキャリアのホールは、直径525.5mmの円形とした。このときの、ホールの中心のアウターキャリアの中心に対する偏芯量は110mmとした。
スラリーは、GC#2000を用い、一定荷重条件で一定厚みまでラッピング加工した。
このときの、ラッピング対象の両面研磨装置用キャリア及びアウターキャリアの条件を表1に示す。
その結果を、図4及び表2に示す。尚、図4のグラフの横軸の角度は、図6(a)、(b)の場合と同様にワークホール周縁部における測定部分の角度を示している。
図4に示すように、ラッピング加工後の平面度分布は、後述する比較例のように中央部(180°付近)が他の部分よりも極端に厚くなることは無く、均一であった。また、厚みレンジは1.12μm、厚みの偏差(厚みバラツキ)は0.30μmと比較例に比べて格段に良好な値となった。
その後、研磨後の半導体シリコンウェーハのフラットネスとして、KLA-Tencor社製Wafersight M49mode 1mmEEにて、ESFQR(Edge Site Frontsurface referenced least sQuares/Range)を測定した。
実施例1において、ESFQRmaxは31.24nm、ESFQRsigma(偏差)は5.07となった。また、比較例に比べESFQRは平均値で10%、偏差は約50%改善し、フラットネスは良好となった。
ホールの中心のアウターキャリアの中心に対する偏芯量を90mmとしたこと以外、実施例1と同様な条件で、20Bサイズの両面研磨装置用キャリアをラッピング加工し、平面度分布を測定した。このときの、ラッピング対象の両面研磨装置用キャリア及びアウターキャリアの条件を表1に示す。
また、ラッピング加工後の平面度分布の測定結果を、図4及び表2に示す。
図4に示すように、ラッピング加工後の平面度分布は後述する比較例のように中央部が他の部分よりも極端に厚くなることは無く、均一であった。また、厚みレンジは1.75μm、厚みの偏差(厚みバラツキ)は0.46μmと比較例に比べて良好な値となった。
その結果を表3に示す。
比較例に比べESFQRの最大値33.00nm、偏差(バラツキ)は7.56と小さく、半導体ウェーハのフラットネスが大幅に改善した。
アウターキャリアを30B(歯先円直径743.8mm、歯底円直径730.8mm)サイズのラッピング装置用キャリアに変更し、ホールの中心のアウターキャリアの中心に対する偏芯量を90mmとしたこと以外、実施例1と同様な条件で、20Bサイズの両面研磨装置用キャリアをラッピング加工し、平面度分布を測定した。このときの、ラッピング対象の両面研磨装置用キャリア及びアウターキャリアの条件を表1に示す。
また、ラッピング加工後の平面度分布の測定結果を、図4及び表2に示す。
図4に示すように、ラッピング加工後の平面度分布は、後述する比較例のように中央部が他の部分よりも極端に厚くなることは無く、均一であった。また、厚みレンジは1.96μm、厚みの偏差は0.39μmと比較例に比べて良好な値となった。
その結果を表3に示す。
比較例に比べESFQRの最大値は33.17nm、バラツキ(偏差)は7.9nmと小さく、半導体ウェーハのフラットネスが大幅に改善した。
図5のように、ラッピング対象の両面研磨装置用キャリアWをアウターキャリアで保持せず、直接ラッピング装置110のサンギア113及びインターナルギア114に噛合させてラッピング加工したこと以外、実施例1と同様な条件で両面研磨装置用キャリアをラッピング加工し、平面度分布を測定した。このときの、ラッピング対象の両面研磨装置用キャリア及びアウターキャリアの条件を表1に示す。
また、ラッピング加工後の平面度分布の測定結果を、図4及び表2に示す。
図4に示すように、比較例では両面研磨装置用キャリアの中央部が厚くなっていた。また、厚みレンジは3.04μm、厚みバラツキは0.81μmと実施例1-3に比べ大幅に悪化していた。
その結果を表3に示す。
比較例では、ESFQRの最大値40.04nm、バラツキ(偏差)12.03nmとなり、半導体ウェーハのフラットネスが実施例1-3に比べて大幅に悪化した。
更に、実施例1-3で製造した両面研磨装置用キャリアを使用した両面研磨では半導体ウェーハのフラットネスも大幅に改善された。
実施例2ではホールの中心のアウターキャリアの中心に対する偏芯量をホールの直径の1/5以上とはしていないものの、アウターキャリアの歯先円直径を、両面研磨装置用キャリアの歯先円直径の1.5倍以上としているため実施例3よりもさらに良好な結果となった。
Claims (8)
- 半導体ウェーハを保持するための保持孔が形成された歯車形の両面研磨装置用キャリアをラッピング装置の上下定盤で挟みながら、前記両面研磨装置用キャリアを公転及び自転させることでラッピング加工して両面研磨装置用キャリアを製造する方法であって、
前記両面研磨装置用キャリアを保持するためのホールを有する、前記両面研磨装置用キャリアよりも大きいサイズの歯車形のアウターキャリアを用意し、該アウターキャリアを前記ホールの中心が前記アウターキャリアの中心に対し偏芯したものとし、
前記ホールに前記両面研磨装置用キャリアを収納することで、前記アウターキャリアで前記両面研磨装置用キャリアを保持し、
前記ホールの中心が前記アウターキャリアの中心に対して偏芯した状態で、該保持した両面研磨装置用キャリアを前記ラッピング装置の上下定盤で挟みながら、前記アウターキャリア及び前記両面研磨装置用キャリアを自転及び公転させることで前記両面研磨装置用キャリアをラッピング加工することを特徴とする両面研磨装置用キャリアの製造方法。 - 前記ホールの形状を円形とし、前記ホールの中心の前記アウターキャリアの中心に対する偏芯量を、前記ホールの直径の1/5以上とすることを特徴とする請求項1に記載の両面研磨装置用キャリアの製造方法。
- 前記ホールの形状を円形とし、前記ホールの直径を前記両面研磨装置用キャリアの歯先円直径より0.5mm~1.0mm大きくすることを特徴とする請求項1又は請求項2に記載の両面研磨装置用キャリアの製造方法。
- 前記アウターキャリアの歯先円直径を、前記両面研磨装置用キャリアの歯先円直径の1.5倍以上とすることを特徴とする請求項1から請求項3のいずれか1項に記載の両面研磨装置用キャリアの製造方法。
- 前記アウターキャリアの材質を炭素工具鋼、ステンレス鋼、又はチタンとすることを特徴とする請求項1から請求項4のいずれか1項に記載の両面研磨装置用キャリアの製造方法。
- 前記両面研磨装置用キャリアの材質をステンレス鋼又はチタンとすることを特徴とする請求項1から請求項5のいずれか1項に記載の両面研磨装置用キャリアの製造方法。
- 請求項1から請求項6のいずれか1項に記載の製造方法で製造された両面研磨装置用キャリア。
- 両面研磨装置において、請求項7に記載の両面研磨装置用キャリアを使用して半導体ウェーハを保持しながら、研磨布の貼付された上下定盤に前記保持した半導体ウェーハの上下面を摺接することで、半導体ウェーハを両面研磨する半導体ウェーハの両面研磨方法。
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2015
- 2015-02-13 TW TW104104984A patent/TWI593512B/zh active
- 2015-02-13 KR KR1020167024531A patent/KR20160133437A/ko not_active Application Discontinuation
- 2015-02-13 DE DE112015000878.0T patent/DE112015000878T5/de not_active Withdrawn
- 2015-02-13 US US15/122,520 patent/US20170069502A1/en not_active Abandoned
- 2015-02-13 CN CN201580011151.XA patent/CN106061679B/zh active Active
- 2015-02-13 WO PCT/JP2015/000662 patent/WO2015136840A1/ja active Application Filing
- 2015-02-13 SG SG11201607115QA patent/SG11201607115QA/en unknown
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US11052506B2 (en) * | 2015-10-09 | 2021-07-06 | Sumco Corporation | Carrier ring, grinding device, and grinding method |
JPWO2019188818A1 (ja) * | 2018-03-30 | 2021-02-12 | 積水化成品工業株式会社 | ハイドロゲル |
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Also Published As
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CN106061679B (zh) | 2017-07-21 |
US20170069502A1 (en) | 2017-03-09 |
JP6056793B2 (ja) | 2017-01-11 |
TW201544245A (zh) | 2015-12-01 |
TWI593512B (zh) | 2017-08-01 |
KR20160133437A (ko) | 2016-11-22 |
CN106061679A (zh) | 2016-10-26 |
DE112015000878T5 (de) | 2016-11-10 |
JP2015174168A (ja) | 2015-10-05 |
SG11201607115QA (en) | 2016-10-28 |
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