WO2015029323A1 - インゴットの切断方法及びワイヤソー - Google Patents
インゴットの切断方法及びワイヤソー Download PDFInfo
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- WO2015029323A1 WO2015029323A1 PCT/JP2014/003889 JP2014003889W WO2015029323A1 WO 2015029323 A1 WO2015029323 A1 WO 2015029323A1 JP 2014003889 W JP2014003889 W JP 2014003889W WO 2015029323 A1 WO2015029323 A1 WO 2015029323A1
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- wire
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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
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/77—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate
- H01L21/78—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D57/00—Sawing machines or sawing devices not covered by one of the preceding groups B23D45/00 - B23D55/00
- B23D57/0007—Sawing machines or sawing devices not covered by one of the preceding groups B23D45/00 - B23D55/00 using saw wires
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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
- B24B27/00—Other grinding machines or devices
- B24B27/06—Grinders for cutting-off
- B24B27/0633—Grinders for cutting-off using a cutting wire
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28D—WORKING STONE OR STONE-LIKE MATERIALS
- B28D5/00—Fine working of gems, jewels, crystals, e.g. of semiconductor material; apparatus or devices therefor
- B28D5/0058—Accessories specially adapted for use with machines for fine working of gems, jewels, crystals, e.g. of semiconductor material
- B28D5/0076—Accessories specially adapted for use with machines for fine working of gems, jewels, crystals, e.g. of semiconductor material for removing dust, e.g. by spraying liquids; for lubricating, cooling or cleaning tool or work
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28D—WORKING STONE OR STONE-LIKE MATERIALS
- B28D5/00—Fine working of gems, jewels, crystals, e.g. of semiconductor material; apparatus or devices therefor
- B28D5/0058—Accessories specially adapted for use with machines for fine working of gems, jewels, crystals, e.g. of semiconductor material
- B28D5/0082—Accessories specially adapted for use with machines for fine working of gems, jewels, crystals, e.g. of semiconductor material for supporting, holding, feeding, conveying or discharging work
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28D—WORKING STONE OR STONE-LIKE MATERIALS
- B28D5/00—Fine working of gems, jewels, crystals, e.g. of semiconductor material; apparatus or devices therefor
- B28D5/04—Fine working of gems, jewels, crystals, e.g. of semiconductor material; apparatus or devices therefor by tools other than rotary type, e.g. reciprocating tools
- B28D5/045—Fine working of gems, jewels, crystals, e.g. of semiconductor material; apparatus or devices therefor by tools other than rotary type, e.g. reciprocating tools by cutting with wires or closed-loop blades
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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
- H01L21/02002—Preparing wafers
Definitions
- the present invention relates to a cutting method and a wire saw for cutting an ingot into a wafer shape with a wire saw.
- a wire saw is exclusively used for cutting an ingot.
- a wire saw is made by running a wire (high-strength steel wire) at a high speed and applying a slurry to the workpiece (for example, a silicon ingot. Hereinafter, it may be simply referred to as an ingot) to cut it.
- This is an apparatus for cutting out a large number of wafers simultaneously (see Patent Document 1).
- FIG. 4 shows an outline of an example of a conventional general wire saw.
- the wire saw 101 is mainly cut by a wire 102 for cutting an ingot, a wire guide 103 around which the wire 102 is wound, a tension applying mechanism 104 for applying tension to the wire 102, and the like.
- An ingot feeding means 105 for feeding out an ingot, and a nozzle 106 for supplying a slurry in which abrasive grains such as SiC fine powder are dispersed and mixed at the time of cutting are configured.
- the wire 102 is fed out from one wire reel 107, and passes through a traverser 108 to a wire guide 103 through a tension applying mechanism 104 including a powder clutch (constant torque motor 109), a dancer roller (dead weight) (not shown), and the like.
- the wire 102 is wound around the wire guide 103 about 300 to 400 times, and then wound around the wire reel 107 ′ through the other tension applying mechanism 104 ′.
- the wire guide 103 is a roller in which polyurethane resin is press-fitted around a steel cylinder and grooves are cut at a constant pitch on the surface thereof.
- the wound wire 102 is predetermined by a drive motor 110. It can be driven in a reciprocating direction with a period.
- a nozzle 106 is provided in the vicinity of the wire guide 103 and the wound wire 102, and slurry can be supplied from the nozzle 106 to the wire guide 103 and the wire 102 at the time of cutting. And after cutting, it is discharged as waste slurry.
- the new wire supply amount at the cutting start portion of the ingot and the new wire supply amount at the cutting end portion are smaller than the new wire supply amount at the time of cutting the central portion.
- the ingot cutting start portion is a portion 15 mm from the portion where the wire first contacts the outer end of the ingot
- the ingot central portion is a portion 150 mm from the outer end. Equivalent to.
- the thickness of the wafer at the cutting start portion of the ingot becomes thinner than the central portion.
- the cutting start portion is the thinnest.
- thickness unevenness the difference between the thickness of the cutting start portion in the wafer surface and the thickness of the central portion.
- the phenomenon that the thickness of the cutting start portion becomes thin is due to the large wire diameter of the wire used at the cutting start portion.
- the wire may be worn.
- a method for adjusting the wear amount of the wire a method of changing the supply amount of the new wire is mentioned. When the supply amount of the new wire is increased, the wear of the wire is reduced.
- the thickness unevenness can be reduced by rewinding the wire before cutting the ingot and using the already worn and worn portion for cutting.
- the thickness unevenness in the wafer surface is reduced, the thickness unevenness is 2 to 3 ⁇ m between the wafers cut from the first and second ingots after the wire replacement. There will be a difference in degree. In the wafer cut out from the first ingot cut after the exchange of the wire, the thickness of the cutting start portion becomes particularly thin, and the difference in thickness unevenness becomes remarkable. This is because the wire diameter of the first portion of the wire used for cutting the first ingot after replacing the wire is different from the wire diameter of the first portion of the wire used for cutting the second and subsequent ingots. .
- the worn wire of the portion already used for cutting the ingot is used at the cutting start position, whereas 1 after replacing the wire.
- the wire diameter of the wire when cutting the cutting start portion is basically constant. If the preliminary cutting to wear the wire is performed before cutting the first ingot after replacing the wire, the above-mentioned problem will be solved, but this will result in unnecessary cutting. This is a disadvantage in terms of device productivity and difficult to implement. For the reasons described above, there is a problem that there is a difference in thickness unevenness between the first ingot after exchanging the wire and the cutting of the second and subsequent ingots, and the variation in thickness unevenness becomes large. ing.
- the present invention has been made in view of the above-described problems, and an ingot cutting method that suppresses variation in thickness unevenness between wafers cut from the first and second and subsequent ingots after wire replacement, and An object is to provide a wire saw.
- a wire row is formed by a wire that runs in the axial direction spirally wound between a plurality of wire guides, and is processed into a contact portion between the ingot and the wire.
- An ingot cutting method for cutting the ingot into a wafer by pressing the ingot against the wire row while supplying a liquid, and when cutting the first ingot after replacing the wire The ratio of the new wire supply amount per unit time at the time of cutting of the cutting start portion with respect to the cutting of the central portion of the ingot is the ratio when cutting the second and subsequent ingots after replacing the wire.
- a method for cutting an ingot which is controlled so that the ratio is 1 ⁇ 2 or less.
- a wire row formed by an axially running wire wound spirally between a plurality of wire guides, and an ingot feed for pressing the ingot against the wire row while holding the ingot
- a nozzle for supplying a processing liquid to a contact portion between the ingot and the wire, and supplying the processing liquid from the nozzle to the contact portion between the ingot and the wire
- a wire saw that cuts into a wafer by pressing an ingot against the wire row, and a cutting start portion for cutting a central portion of the ingot when cutting the first ingot after replacing the wire
- the ratio of the new wire supply amount per unit time at the time of cutting of the wire is before the second wire after the wire is replaced.
- Wire saw characterized by comprising control means for controlling such that half or less of the ratio of the time of cutting the ingot is provided.
- the thickness variation peculiar to the wafer cut from the first ingot after wire replacement can be made the same level as the thickness variation of the wafer cut from the second and subsequent ingots.
- the processing conditions in the lapping process etc. which are post processes can be arranged, and productivity can be improved.
- the present invention is not limited to this.
- the difference in thickness unevenness between the wafer cut from the first ingot after the wire replacement and the wafer cut from the second and subsequent ingots particularly due to the difference in the wire diameter at the cutting start portion. Becomes larger. If there is unevenness in thickness unevenness between cutting lots (the first cut and the second and subsequent cuts), the required stock allowance in the subsequent process such as lapping necessary to remove the thickness unevenness is also determined for each lot. However, there was a demerit in that the processing conditions could not be aligned.
- the present inventor cuts the wire in the cutting start portion of the first ingot after exchanging the wire by reducing the supply amount of the new wire and making the wire wear more during cutting to reduce the wire diameter.
- the present invention was completed by conceiving that variation in thickness unevenness between lots can be suppressed.
- the wire saw 1 of the present invention mainly includes a wire 2 for cutting an ingot W, a wire guide 3, a wire tension applying mechanism 4, 4 ′ for applying tension to the wire 2, and an ingot.
- the ingot feeding means 5 that pushes W relatively down while holding W, and the nozzle 6 for supplying the machining fluid to the wire 2 at the time of cutting are configured.
- the wire 2 is fed out from one of the wire reels 7, and passes through a traverser 14 through a wire tension applying mechanism 4 including a powder clutch (constant torque motor 15), a dancer roller (dead weight) (not shown) and the like, and then the wire guide 3. In.
- the wire 2 is wound around the plurality of wire guides 3 about 300 to 400 times to form the wire row 17.
- the wire 2 is wound around a wire reel 7 'through another wire tension applying mechanism 4'.
- As this wire for example, a high tensile steel wire or the like can be used.
- the wire reels 7 and 7 ' are rotationally driven by wire reel drive motors 16 and 16'. Further, the tension applied to the wire 2 is precisely adjusted by the tension applying mechanisms 4 and 4 ′.
- the nozzle 6 supplies a working fluid to the contact portion between the ingot W and the wire 2.
- the nozzle 6 is not particularly limited, but can be disposed above the wire 2 wound around the wire guide 3.
- the nozzle 6 is connected to a slurry tank (not shown), and the supplied slurry can be supplied from the nozzle 6 to the wire 2 by controlling the supply temperature by a slurry chiller (not shown). it can.
- the kind of the working fluid used during the cutting of the ingot W is not particularly limited, and the same one as the conventional one can be used.
- silicon carbide abrasive grains or diamond abrasive grains are dispersed in the coolant. be able to.
- a water-soluble or oil-based coolant can be used as the coolant.
- the ingot feeding means 5 includes an ingot feeding table 10 for feeding out an ingot, an LM guide 11, an ingot clamp 12 for gripping the ingot, a slicing plate 13, etc., and the ingot feeding along the LM guide 11 by computer control. By driving the table 10, it is possible to feed out an ingot fixed to the tip at a pre-programmed feed speed.
- the wire guide 3 is a roller in which a polyurethane resin is press-fitted around a steel cylinder and grooves are cut at a predetermined pitch on the surface thereof, so that the wire 2 can be prevented from being damaged and wire breakage can be suppressed. Further, the wire guide 3 is configured such that the wound wire 2 can reciprocate in the axial direction by a driving motor 8. When the wire 2 is reciprocated, the traveling distance in both directions of the wire 2 is not made the same, but the traveling distance in one direction is made longer. In this way, a new line is supplied in the direction of a long travel distance by reciprocating the wire.
- the wire saw of the present invention includes a control means 9 for controlling the supply amount of the new wire when the ingot W is cut as described below.
- This control means 9 is a new wire per unit time at the time of cutting the cutting start portion with respect to the cutting of the central portion of the ingot W when cutting the first ingot W after replacing the wire 2 with a new one.
- the ratio of the supply amount (the supply amount of new wire at the time of cutting the cutting start portion / the supply amount of new wire at the time of cutting the central portion) is determined when cutting the second and subsequent ingots W after the wire 2 is replaced. Control is performed so that the ratio becomes 1/2 or less of the above ratio.
- the control means 9 is not particularly limited, for example, the drive speed of the wire guide 3 can be controlled by connecting it to the drive motor 8, and the new wire supply amount can be changed according to the cutting position of the ingot.
- the ratio when cutting the cutting start portion of the first ingot W is 1 ⁇ 2 or less compared to when cutting the cutting start portion of the second and subsequent ingots W.
- the wire supply amount per unit time can be appropriately reduced, and the wire diameter can be reduced by advancing the wear of the wire 2 with the wire diameter being large in an unused state.
- the ingot cutting method of the present invention will be described.
- the wire saw 1 of the present invention as shown in FIG. 1 is used will be described.
- the wire is replaced with a new wire 2 that is not used for cutting.
- an ingot W to be cut first is prepared.
- the ingot W is held by the ingot feeding means 5.
- the wire 2 is reciprocated in the axial direction by the driving motor 8 while applying tension to the wire 2 by the tension applying mechanisms 4 and 4 ′.
- the ingot feeding means 5 relatively pushes down the ingot W, presses the ingot W against the wire row 17, and starts cutting the first ingot W.
- the cutting is advanced while supplying the working fluid from the nozzle 6 to the contact portion between the ingot W and the wire 2.
- the ratio of the new wire supply amount per unit time at the time of cutting of the cutting start portion to the cutting of the central portion of the first ingot W is equal to the above ratio when cutting the second and subsequent ingots W. Control to be 1 ⁇ 2 or less.
- the supply amount of each new wire (for example, the supply amount of the new wire at the time of cutting the first or second ingot after cutting or the central portion) is appropriately set according to cutting conditions (for example, the material and diameter of the ingot to be cut). Can be set.
- the ingot is further pushed down to proceed with cutting, and after cutting is completed, the cutting direction of the ingot W is reversed to pull out the cut ingot W from the wire row 17 and cut it out. Recover the wafer. And the ingot W cut
- the ratio when cutting the cutting start portion of the first ingot W is set to 1 ⁇ 2 or less compared to cutting the cutting start portion of the second and subsequent ingots W.
- the wire supply amount per unit time can be appropriately reduced, and the wire diameter can be reduced by advancing the wear of the wire 2 having a large wire diameter in an unused state.
- Example 1 In the wire saw of the present invention as shown in FIG. 1, after replacing the wire with a new wire, the plurality of ingots were repeatedly cut according to the cutting method of the present invention. The thickness unevenness of the wafer cut out from each ingot was measured, and the average of the thickness unevenness for each wafer cut out from each ingot was calculated. As described above, the thickness unevenness is a difference between the thickness of the cutting start portion and the thickness of the central portion in the wafer surface. In Example 1, when cutting the first ingot after replacing the wire, the ratio of the supply amount of the new wire per unit time at the time of cutting the cutting start portion to the cutting time of the central portion of the ingot is 10% It was.
- the ratio of the new wire supply amount per unit time at the time of cutting the cutting start portion to the cutting time of the central portion of the ingot when cutting the second and subsequent ingots was set to 26%. That is, the ratio when cutting the first ingot was controlled to be 10/26 of the ratio when cutting the second and subsequent ingots.
- the results are shown in FIG.
- the vertical axis of the graph of FIG. 3 represents the thickness unevenness
- the horizontal axis represents the ratio of the new wire supply amount per unit time at the time of cutting the cutting start portion to the cutting time of the central portion of the ingot.
- Table 1 the average thickness unevenness of the wafer cut out from the first ingot was 0.8 ⁇ m.
- the average thickness unevenness of the wafers cut from the second and subsequent ingots was 0.5 ⁇ m. Therefore, the difference in thickness unevenness was 0.3 ⁇ m, and it was confirmed that the variation in thickness unevenness was very small as compared with the comparative example described later.
- Example 2 Under the same conditions as in Example 1, except that the ratio when cutting the first ingot after replacing the wire was 33%, and the ratio when cutting the second and subsequent ingots was 66%, The ingot was cut repeatedly. That is, the ratio when cutting the first ingot was 1 ⁇ 2 of the ratio when cutting the second and subsequent ingots. After the ingot was cut, the thickness unevenness was measured in the same manner as in Example 1 and the average was calculated. As a result, as shown in FIG. 3 and Table 1, the average thickness unevenness of the wafer cut out from the first ingot was 4.0 ⁇ m. The average thickness unevenness of the wafers cut from the second and subsequent ingots was 4.5 ⁇ m. Therefore, the difference in thickness unevenness was 0.5 ⁇ m, and it was confirmed that the variation in thickness unevenness was very small as in Example 1.
- Example 2 The ingot was repeatedly cut under the same conditions as in Example 2 except that the above ratios when cutting the first ingot after exchanging the wires and when cutting the second and subsequent ingots were set to the same value. It was. First, the above ratio when cutting the first ingot after exchanging the wires and when cutting the second and subsequent ingots was set to 66%. After the ingot was cut, the thickness unevenness was measured in the same manner as in Example 1 and the average was calculated. As a result, as shown in FIG. 3 and Table 1, the difference in thickness unevenness of the wafers cut from the first ingot and the second and subsequent ingots is 2.6 ⁇ m. It was confirmed that the variation in unevenness became large.
- Table 1 summarizes the results of the examples and comparative examples.
- 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
ワイヤソーは、ワイヤ(高張力鋼線)を高速走行させて、ここにスラリを掛けながら、ワーク(例えばシリコンインゴットが挙げられる。以下、単にインゴットと言うこともある。)を押し当てて切断し、多数のウェーハを同時に切り出す装置である(特許文献1参照)。
図4に示すように、ワイヤソー101は、主に、インゴットを切断するためのワイヤ102、ワイヤ102を巻回したワイヤガイド103、ワイヤ102に張力を付与するための張力付与機構104、切断されるインゴットを送り出すインゴット送り手段105、切断時に、SiC微粉等の砥粒をクーラントに分散して混合したスラリを供給するためのノズル106等で構成されている。
一般的に、インゴットの切断開始部分でのワイヤ新線供給量と切断終了部分でのワイヤ新線供給量は、中央部分切断時でのワイヤ新線供給量よりも小さい値になっている。なお、例えば直径300mmのインゴットの場合、インゴットの切断開始部分とは、インゴットの外周端にワイヤが最初に接触する部分から15mmの部分とし、またインゴット中央部分とは、外周端から150mmの部分に相当する。
これはワイヤを交換した後の1本目のインゴットの切断で最初に使われる部分のワイヤの線径と、インゴット2本目以降の切断で最初に使われる部分のワイヤの線径が異なることに起因する。
ワイヤを交換した後の1本目のインゴットを切断する前に、ワイヤを摩耗させるための予備切断を行えば、上記の問題は解消されることになるが、それでは、無駄な切断を行うことになり、装置生産性の観点でデメリットとなり実施が難しい。以上のような理由により、ワイヤを交換した後の1本目のインゴットと2本目以降のインゴットの切断とで、厚さムラに差が出て、厚さムラのばらつきが大きくなることが問題となっている。
上述したように、ワイヤ交換後1本目のインゴットから切り出されたウェーハと2本目以降のインゴットから切り出されたウェーハの間で、特に切断開始部分でのワイヤの線径の違いから厚さムラの差が大きくなる。切断ロット間(1本目の切断と、2本目以降の切断)で、厚さムラのバラツキがあると、厚さムラを取り除くのに必要なラップ工程等の後工程での必要取り代もロット毎に異なり、加工条件を揃えられない点でデメリットがあった。そこで、本発明者は、ワイヤを交換した後の1本目のインゴットの切断開始部分において、ワイヤ新線供給量を小さくし、切断中にワイヤをより摩耗させて線径を細くすることで、切断ロット間の厚さムラのバラツキを抑制できることに想到し、本発明を完成させた。
図1に示すように、本発明のワイヤソー1は、主に、インゴットWを切断するためのワイヤ2、ワイヤガイド3、ワイヤ2に張力を付与するためのワイヤ張力付与機構4、4’、インゴットWを保持しつつ相対的に押し下げるインゴット送り手段5、切断時にワイヤ2に加工液を供給するためのノズル6等で構成されている。
ここで、インゴットWの切断中に使用する加工液の種類は特に限定されず、従来と同様のものを用いることができ、例えば炭化珪素砥粒やダイヤモンド砥粒をクーラントに分散させたものとすることができる。クーラントとしては、例えば水溶性又は油性のクーラントを用いることができる。
まず初めに、ワイヤソー1において、切断に使用していない新品の状態のワイヤ2にワイヤを交換する。そして、ワイヤ2を交換した後に1本目に切断するインゴットWを準備する。次に、インゴット送り手段5によりインゴットWを保持する。そして、ワイヤ2に張力付与機構4、4’によって張力を付与しながら、駆動用モータ8によって軸方向へ往復走行させる。
このとき、この1本目のインゴットWの中央部分の切断時に対する切断開始部分の切断時の単位時間当たりのワイヤ新線供給量の比率が、2本目以降のインゴットWを切断する際の上記比率の1/2以下となるように制御する。それぞれのワイヤ新線供給量(例えば1本目又は2本目以降のインゴットの切断開始部分又は中央部分の切断時におけるワイヤ新線供給量)は、適宜切断条件(例えば切断するインゴットの材質や直径等)によって設定することができる。
上記のように、新品に交換した後のワイヤ2で複数のインゴットWを順番に、繰り返しウェーハ状に切断していく。
図1に示すような、本発明のワイヤソーにおいて、ワイヤを新品の状態のワイヤに交換してから、複数のインゴットの切断を本発明の切断方法に従って繰り返し行った。
各インゴットから切り出されたウェーハの厚さムラを測定し、各インゴットから切り出されたウェーハ毎の厚さムラの平均を算出した。尚、厚さムラとは前述したようにウェーハ面内の切断開始部分の厚さと中央部分の厚さの差である。
実施例1では、ワイヤを交換した後の1本目のインゴットを切断する際の、インゴットの中央部分の切断時に対する切断開始部分の切断時の単位時間当たりのワイヤ新線供給量の比率は10%とした。そして、2本目以降のインゴットを切断する際の、インゴットの中央部分の切断時に対する切断開始部分の切断時の単位時間当たりのワイヤ新線供給量の比率は26%とした。つまり、1本目のインゴットを切断する際の上記比率は、2本目以降のインゴットを切断する際の上記比率の10/26となるように制御した。
その結果を図3、表1に示す。図3のグラフの縦軸は厚さムラ、横軸はインゴットの中央部分の切断時に対する切断開始部分の切断時の単位時間当たりのワイヤ新線供給量の比率を表している。表1に示すように、1本目のインゴットから切り出されたウェーハの厚さムラの平均は0.8μmとなった。そして、2本目以降のインゴットから切り出されたウェーハの厚さムラの平均は0.5μmとなった。従って、厚さムラの差は0.3μmであり、後述する比較例と比べて非常に厚さムラのバラツキが小さくなることが確認された。
ワイヤを交換した後の1本目のインゴットを切断する際の上記比率を33%、2本目以降のインゴットを切断する際の上記比率を66%としたこと以外、実施例1と同様な条件で、インゴットの切断を繰り返し行った。すなわち、1本目のインゴットを切断する際の上記比率は、2本目以降のインゴットを切断する際の上記比率の1/2であった。
インゴットの切断が終了した後、実施例1と同様な方法で厚さムラを測定し平均を算出した。
その結果、図3、表1に示すように、1本目のインゴットから切り出されたウェーハの厚さムラの平均は4.0μmとなった。そして、2本目以降のインゴットから切り出されたウェーハの厚さムラの平均は4.5μmとなった。従って、厚さムラの差は0.5μmとなり実施例1と同様に、非常に厚さムラのバラツキが小さくなることが確認された。
ワイヤを交換した後の1本目のインゴットを切断する際と2本目以降のインゴットを切断する際の上記比率を同じ値としたこと以外、実施例2と同様な条件で、インゴットの切断を繰り返し行った。まず、ワイヤを交換した後の1本目のインゴットを切断する際と2本目以降のインゴットを切断する際の上記比率を66%とした。
インゴットの切断が終了した後、実施例1と同様な方法で厚さムラを測定し平均を算出した。
その結果、図3、表1に示すように、1本目のインゴットと2本目以降のインゴットから切り出されたウェーハの厚さムラの差は2.6μmとなり、実施例1、2に比べて厚さムラのバラツキが大きくなったことが確認された。
また、上記比率を33%、26%、10%として同様に切断を繰り返した結果、厚さムラの差はそれぞれ、2.4μm、2.2μm、3.2μmとなり、実施例1、2に比べて厚さムラのバラツキが大きくなったことが確認された。
Claims (2)
- 複数のワイヤガイド間に螺旋状に巻回された軸方向に走行するワイヤでワイヤ列を形成し、インゴットと前記ワイヤとの接触部に加工液を供給しながら、前記ワイヤ列に前記インゴットを押し当てることで、前記インゴットをウェーハ状に切断するインゴットの切断方法であって、
前記ワイヤを交換した後の1本目の前記インゴットを切断する際の、前記インゴットの中央部分の切断時に対する切断開始部分の切断時の単位時間当たりのワイヤ新線供給量の比率が、前記ワイヤを交換した後の2本目以降の前記インゴットを切断する際の前記比率の1/2以下となるように制御することを特徴とするインゴットの切断方法。 - 複数のワイヤガイド間に螺旋状に巻回された軸方向に走行するワイヤによって形成されるワイヤ列と、インゴットを保持しながら前記ワイヤ列に前記インゴットを押し当てるインゴット送り手段と、前記インゴットと前記ワイヤとの接触部に加工液を供給するノズルを具備し、前記ノズルから前記インゴットと前記ワイヤとの接触部に前記加工液を供給しながら、前記インゴット送り手段により前記インゴットを前記ワイヤ列に押し当てることでウェーハ状に切断するワイヤソーであって、
前記ワイヤを交換した後の1本目の前記インゴットを切断する際の、前記インゴットの中央部分の切断時に対する切断開始部分の切断時の単位時間当たりのワイヤ新線供給量の比率が、前記ワイヤを交換した後の2本目以降の前記インゴットを切断する際の前記比率の1/2以下となるように制御する制御手段を具備することを特徴とするワイヤソー。
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