JP2021100073A - Polishing pad and method for processing semiconductor wafer using the same - Google Patents

Polishing pad and method for processing semiconductor wafer using the same Download PDF

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JP2021100073A
JP2021100073A JP2019231846A JP2019231846A JP2021100073A JP 2021100073 A JP2021100073 A JP 2021100073A JP 2019231846 A JP2019231846 A JP 2019231846A JP 2019231846 A JP2019231846 A JP 2019231846A JP 2021100073 A JP2021100073 A JP 2021100073A
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polishing pad
polishing
layer
surface plate
semiconductor wafer
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上野 淳一
Junichi Ueno
淳一 上野
薫 石井
Kaoru Ishii
薫 石井
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Shin Etsu Handotai Co Ltd
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Shin Etsu Handotai Co Ltd
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Priority to PCT/JP2020/036751 priority patent/WO2021131200A1/en
Priority to TW109137742A priority patent/TW202124095A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B37/00Lapping machines or devices; Accessories
    • B24B37/11Lapping tools
    • B24B37/20Lapping pads for working plane surfaces
    • B24B37/22Lapping pads for working plane surfaces characterised by a multi-layered structure
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/02Manufacture or treatment of semiconductor devices or of parts thereof
    • H01L21/04Manufacture 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
    • H01L21/18Manufacture 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
    • H01L21/30Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
    • H01L21/302Treatment 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
    • H01L21/304Mechanical treatment, e.g. grinding, polishing, cutting

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  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Manufacturing & Machinery (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
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  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Mechanical Treatment Of Semiconductor (AREA)

Abstract

To provide a polishing pad that does not cause air accumulation between a grooved portion of the polishing pad and a surface plate when the polishing pad is attached to the surface plate.SOLUTION: A polishing pad having a polishing layer and a double-sided tape laminated on one side of the polishing layer, comprises a PET film with a thickness of between 125 μm and 500 μm between the polishing layer and the double-sided tape.SELECTED DRAWING: Figure 1

Description

本発明は、研磨パッドと該研磨パッドを用いた半導体ウェーハの加工方法に関する。 The present invention relates to a polishing pad and a method for processing a semiconductor wafer using the polishing pad.

半導体ウェーハの研磨は、両面研磨(DSP)加工後に片面研磨(CMP)加工を行うフローが一般的である。例えば、両面研磨でウェーハの形状を作り込み、片面研磨でウェーハ表面品質を作り込むことが行われている。 In the polishing of semiconductor wafers, a flow in which single-sided polishing (CMP) processing is performed after double-sided polishing (DSP) processing is common. For example, the shape of the wafer is created by double-sided polishing, and the wafer surface quality is created by single-sided polishing.

研磨加工で用いる研磨パッドは、加工するウェーハ面へのスラリ持ち込みを目的に、スパイラル、亀甲、図6に示したような格子等のパターンの溝が研磨パッド表面の研磨層に形成されることがある。これらのパターンの溝により、軟質研磨パッドである不織布パッドや、発砲ウレタンタイプのShore A 35以下のパッドでは、研磨定盤に固定する時に、溝部近傍にエアー溜まりが発生することがある。そのエアー溜まりにより研磨パッド表面が盛り上がり、この盛り上がりによる研磨パッド表面の凹凸が加工ウェーハ表面に転写されてNanotopo品質を悪化させることがある。 In the polishing pad used in the polishing process, grooves of a pattern such as a spiral, a hexagonal shell, and a lattice as shown in FIG. 6 may be formed in the polishing layer on the surface of the polishing pad for the purpose of bringing the slurry to the wafer surface to be processed. is there. Due to the grooves of these patterns, in the non-woven fabric pad which is a soft polishing pad and the pad of the foamed urethane type Shore A 35 or less, air pool may be generated in the vicinity of the groove when fixed to the polishing surface plate. The air pool causes the surface of the polishing pad to swell, and the unevenness of the surface of the polishing pad due to the swelling may be transferred to the surface of the processed wafer, deteriorating the Nanotopo quality.

図5に示すように、従来の研磨パッドの構造は、研磨層1に両面テープ2を貼り付けた物であった(特許文献1)。研磨パッド20の定盤5への固定は、定盤外周側から中心方向へ向かって、さらに、対向する外周側へ向かってエアーを押し出すように、研磨パッドの研磨層の片面に積層された両面テープの糊と剥離紙を少しずつ剥がしながら、ローラー等の治具を用いて定盤に研磨パッドを固定していくという方法で行う。その際、軟質研磨パッドを持ち上げている為、図7に示すように、研磨パッド20の溝7の形状に沿って折れ曲がり、エアーを含んだ状態で固定される。また、溝7があることでローラーによる残留エアーを押し出す効果も軽減されて、エアー溜まり6が発生する。 As shown in FIG. 5, the structure of the conventional polishing pad is that the double-sided tape 2 is attached to the polishing layer 1 (Patent Document 1). The polishing pad 20 is fixed to the surface plate 5 on both sides laminated on one side of the polishing layer of the polishing pad so as to push air from the outer peripheral side of the surface plate toward the center and further toward the opposite outer peripheral side. While peeling off the adhesive of the tape and the release paper little by little, the polishing pad is fixed to the surface plate using a jig such as a roller. At that time, since the soft polishing pad is lifted, as shown in FIG. 7, it is bent along the shape of the groove 7 of the polishing pad 20 and fixed in a state of containing air. Further, the presence of the groove 7 reduces the effect of pushing out the residual air by the roller, and an air pool 6 is generated.

研磨パッドを定盤に貼り付けた後に、目視と触診によりエアー溜まりの有無の確認を行い、エアー溜まりがあることが確認された場合は、針により気抜きを行っている。しかし、エアー溜まりの見逃し等の危険性を考えると、エアー溜まりの発生がないことが理想である。このエアー溜まりによって、研磨パッドの表層部に凹凸が生じ、その凹凸が原因でNanotopo品質の悪化が生じることがある。 After the polishing pad is attached to the surface plate, the presence or absence of an air pool is confirmed by visual inspection and palpation, and if it is confirmed that there is an air pool, the air is evacuated with a needle. However, considering the danger of overlooking the air pool, it is ideal that no air pool is generated. Due to this air accumulation, unevenness is generated on the surface layer portion of the polishing pad, and the unevenness may cause deterioration of Nanotopo quality.

特開2012−35393号公報Japanese Unexamined Patent Publication No. 2012-35393

上記のように研磨パッドの溝がある部分と定盤との間にエアー溜まりが発生した場合には、エアー溜まりにより研磨パッド表面が盛り上がり、この盛り上がりによる研磨パッド表面の凹凸が加工ウェーハ表面に転写されてNanotopo品質を悪化させるため、エアー溜まりが発生しない研磨パッドの検討がなされてきた。 When an air pool is generated between the grooved portion of the polishing pad and the surface plate as described above, the surface of the polishing pad rises due to the air pool, and the unevenness of the surface of the polishing pad due to this rise is transferred to the surface of the processing wafer. As a result, polishing pads that do not generate air pools have been studied in order to deteriorate the quality of Nanotopo.

本発明は、上記問題を解決するためになされたものであり、研磨パッドを定盤に固定する時に、研磨パッドの溝が形成された部分と定盤との間にエアー溜まりが発生しない研磨パッド及び、そのような研磨パッドを用いた、半導体ウェーハの加工方法を提供することを目的とする。 The present invention has been made to solve the above problems, and when the polishing pad is fixed to the surface plate, the polishing pad does not generate air accumulation between the grooved portion of the polishing pad and the surface plate. An object of the present invention is to provide a method for processing a semiconductor wafer using such a polishing pad.

本発明は、上記目的を達成するためになされたものであり、研磨層と、該研磨層の片面に積層された両面テープとを有する研磨パッドであって、前記研磨層と前記両面テープとの間に、厚さが125μm以上500μm以下であるPETフィルムを有する研磨パッドを提供する。 The present invention has been made to achieve the above object, and is a polishing pad having a polishing layer and a double-sided tape laminated on one side of the polishing layer, wherein the polishing layer and the double-sided tape are used. In between, a polishing pad having a PET film having a thickness of 125 μm or more and 500 μm or less is provided.

このような研磨パッドによれば、研磨パッドを定盤に固定する時に、研磨パッドの折れ曲がりを少なくするように、研磨パッドにこしを持たせることで、研磨パッドの溝が形成された部分と定盤との間におけるエアー溜まりの発生を抑制できるので、定盤に貼り付けた研磨パッドの研磨層で凹凸がないものとなる。 According to such a polishing pad, when the polishing pad is fixed to the surface plate, the polishing pad is provided with a strain so as to reduce the bending of the polishing pad, so that the portion where the groove of the polishing pad is formed is determined. Since it is possible to suppress the generation of air pools between the surface plate and the surface plate, the polishing layer of the polishing pad attached to the surface plate has no unevenness.

また、前記PETフィルムと前記研磨層との間に接着層を有することが好ましい。 Further, it is preferable to have an adhesive layer between the PET film and the polishing layer.

このような研磨パッドによれば、研磨パッドを定盤に固定する時に、研磨パッドの溝がある部分と定盤との間におけるエアー溜まりの発生をさらに抑制できる。 According to such a polishing pad, when the polishing pad is fixed to the surface plate, the generation of air accumulation between the grooved portion of the polishing pad and the surface plate can be further suppressed.

また、上記の研磨パッドを用いて半導体ウェーハの表面を研磨する半導体ウェーハの加工方法を提供する。 Further, the present invention provides a method for processing a semiconductor wafer in which the surface of the semiconductor wafer is polished using the above-mentioned polishing pad.

このような方法によれば、研磨パッドを定盤に固定する時に、研磨パッドの溝がある部分と定盤との間にエアー溜まりが発生しないため、表面に凹凸のない研磨パッドを用いることができ、加工ウェーハ表面のNanotopo品質を向上させることができる。 According to such a method, when the polishing pad is fixed to the surface plate, air is not accumulated between the grooved portion of the polishing pad and the surface plate, so that the polishing pad having no unevenness on the surface can be used. It is possible to improve the Nanotopo quality of the surface of the processed wafer.

以上のように、本発明の研磨パッドによれば、研磨パッドを定盤に固定する時に、研磨パッドの溝が形成された部分と定盤との間におけるエアー溜まりがなくなることで研磨パッドの研磨層で凹凸がなくなり、定盤への固定後に脱気のための作業が不要になる。また、本発明の研磨パッドを用いて半導体ウェーハの研磨加工を行うと、半導体ウェーハ表面のNanotopo品質を向上させることができる。 As described above, according to the polishing pad of the present invention, when the polishing pad is fixed to the surface plate, the polishing pad is polished by eliminating the air accumulation between the grooved portion of the polishing pad and the surface plate. The layer eliminates unevenness, eliminating the need for deaeration work after fixing to the surface plate. Further, when the semiconductor wafer is polished using the polishing pad of the present invention, the Nanotopo quality of the semiconductor wafer surface can be improved.

本発明の研磨パッドを定盤に接着した状態を示した図である。It is a figure which showed the state which adhered the polishing pad of this invention to a surface plate. 従来の研磨パッド表面を真直度測定機により測定した結果を示した図である。It is a figure which showed the result of having measured the surface of a conventional polishing pad by a straightness measuring machine. 本発明の研磨パッド表面を真直度測定機により測定した結果を示した図である。It is a figure which showed the result of having measured the surface of the polishing pad of this invention by the straightness measuring machine. 研磨加工を行った半導体ウェーハのNanotopoを比較した結果を示した図である。It is a figure which showed the result of having compared the Nanotopo of the semiconductor wafer which performed the polishing process. 従来の研磨パッドを定盤に接着した状態を示した図である。It is a figure which showed the state which the conventional polishing pad was adhered to a surface plate. 格子状の溝付研磨パッドを示した図である。It is a figure which showed the grid-shaped grooved polishing pad. エアー溜まりの模式図を示した図である。It is a figure which showed the schematic diagram of the air pool.

以下、本発明を詳細に説明するが、本発明はこれらに限定されるものではない。 Hereinafter, the present invention will be described in detail, but the present invention is not limited thereto.

上述のように、研磨パッドを定盤に固定する時に、研磨パッドの溝がある部分と定盤との間にエアー溜まりが発生しないような研磨パッドが求められていた。 As described above, when fixing the polishing pad to the surface plate, there has been a demand for a polishing pad that does not cause air accumulation between the grooved portion of the polishing pad and the surface plate.

本発明者らは、上記課題について鋭意検討を重ねた結果、研磨層と、該研磨層の片面に積層された両面テープとを有する研磨パッドであって、前記研磨層と前記両面テープとの間に、厚さが125μm以上500μm以下であるPETフィルムを有する研磨パッドにより、研磨パッドを定盤に固定した時に、エアー溜まりがなくなることで研磨パッド表層の研磨層で凹凸をなくすことができ、その結果、定盤への固定後に脱気のための作業が不要になり、また、本発明の研磨パッドを用いて研磨した半導体ウェーハ表面のNanotopo品質を向上させることができることを見出し、本発明を完成した。 As a result of diligent studies on the above problems, the present inventors have obtained a polishing pad having a polishing layer and a double-sided tape laminated on one side of the polishing layer, and between the polishing layer and the double-sided tape. In addition, a polishing pad having a PET film having a thickness of 125 μm or more and 500 μm or less can eliminate unevenness in the polishing layer on the surface of the polishing pad by eliminating air accumulation when the polishing pad is fixed to the platen. As a result, it was found that the work for degassing after fixing to the platen becomes unnecessary, and the Nanotopo quality of the surface of the semiconductor wafer polished by using the polishing pad of the present invention can be improved, and the present invention is completed. did.

以下、図面を参照して説明する。 Hereinafter, description will be made with reference to the drawings.

図5に示したように、従来の研磨パッド20の構造は、研磨層1に、PETフィルム2aの両面に接着層2b、2cを有する両面テープ2を貼り付けた物である。研磨パッド20の定盤5への固定は、定盤5の外周側から中心方向へ向かって、さらに、対向する外周側へエアーを押し出すように、研磨パッド20の研磨層1の片面に積層された両面テープ2の剥離紙を少しずつ剥がしながら、ローラー等の治具を用いて定盤5に研磨パッド20を固定していくという方法で行う。その際、軟質研磨パッド20は持ち上がっている為、図7に示したように、研磨パッド20の溝形状に沿って折れ曲がり、エアーを含んだ状態で固定され、溝があることでローラーによる残留エアーを押し出す効果も軽減されて、エアー溜まり6が発生していた。 As shown in FIG. 5, the structure of the conventional polishing pad 20 is a structure in which a double-sided tape 2 having adhesive layers 2b and 2c on both sides of the PET film 2a is attached to the polishing layer 1. The polishing pad 20 is fixed to the surface plate 5 by being laminated on one side of the polishing layer 1 of the polishing pad 20 so as to push air from the outer peripheral side of the surface plate 5 toward the center and further toward the opposite outer peripheral side. While peeling off the release paper of the double-sided tape 2 little by little, the polishing pad 20 is fixed to the surface plate 5 using a jig such as a roller. At that time, since the soft polishing pad 20 is lifted, as shown in FIG. 7, it is bent along the groove shape of the polishing pad 20 and fixed in a state of containing air. The effect of pushing out was also reduced, and an air pool 6 was generated.

このエアー溜まり6の発生は、溝7によって研磨層1が薄くなり、研磨層1が折れ曲がりやすい状況に原因があるため、本発明者は、研磨パッドの研磨層が折れ曲がり難くなるように研磨層の下面と両面テープとの間に別途PETフィルムを設けることで改善することを試みた。その結果、厚さが125μm以上500μm以下であるPETフィルムを研磨層と両面テープとの間に入れることでエアー溜まりの発生が防止できることを見出した。 The generation of the air pool 6 is caused by a situation in which the polishing layer 1 is thinned by the groove 7 and the polishing layer 1 is easily bent. Therefore, the present inventor of the polishing layer makes it difficult for the polishing layer of the polishing pad to bend. An attempt was made to improve by separately providing a PET film between the lower surface and the double-sided tape. As a result, it was found that the generation of air accumulation can be prevented by inserting a PET film having a thickness of 125 μm or more and 500 μm or less between the polishing layer and the double-sided tape.

図1に本発明の研磨パッド10を示す。なお、従来の研磨パッド(図5)と同じ物についての説明は適宜省略する。本発明に係る研磨パッド10は、研磨層1と、研磨層1の片面に積層された両面テープ2とを有し、研磨層1と両面テープ2との間に、厚さが125μm以上500μm以下であるPETフィルム3を有する。 FIG. 1 shows the polishing pad 10 of the present invention. The description of the same thing as the conventional polishing pad (FIG. 5) will be omitted as appropriate. The polishing pad 10 according to the present invention has a polishing layer 1 and a double-sided tape 2 laminated on one side of the polishing layer 1, and has a thickness of 125 μm or more and 500 μm or less between the polishing layer 1 and the double-sided tape 2. It has a PET film 3 which is.

この時使用する両面テープ2は特に限定されない。例えば、厚さが25μm程度のPETフィルム2aの両面を、厚さが40μm程度の接着層2b、2cで挟み込んだ両面テープを用いることができる。 The double-sided tape 2 used at this time is not particularly limited. For example, a double-sided tape in which both sides of a PET film 2a having a thickness of about 25 μm is sandwiched between adhesive layers 2b and 2c having a thickness of about 40 μm can be used.

このような本発明の研磨パッドによれば、エアー溜まりがなくなることで研磨パッド表層の研磨層で凹凸がなくなり、定盤への固定後に脱気のための作業が不要になる。また、本発明の研磨パッドを用いて研磨した半導体ウェーハ表面のNanotopo品質を向上させることができる。 According to the polishing pad of the present invention as described above, since the air pool is eliminated, the polishing layer on the surface of the polishing pad has no unevenness, and the work for degassing after fixing to the surface plate becomes unnecessary. Further, it is possible to improve the Nanotopo quality of the surface of the semiconductor wafer polished by using the polishing pad of the present invention.

また、PETフィルム3と研磨層1との間に接着層4を有することが好ましい。 Further, it is preferable to have an adhesive layer 4 between the PET film 3 and the polishing layer 1.

この時使用する接着層4は特に限定されない。例えば、厚さが40μm程度の接着層4を用いることができる。 The adhesive layer 4 used at this time is not particularly limited. For example, an adhesive layer 4 having a thickness of about 40 μm can be used.

このような研磨パッドによれば、研磨層1とPETフィルム3をより強く接着できるので、研磨パッドの溝がある部分と定盤との間におけるエアー溜まりの発生をさらに抑制できる。 According to such a polishing pad, the polishing layer 1 and the PET film 3 can be more strongly adhered to each other, so that the generation of air accumulation between the grooved portion of the polishing pad and the surface plate can be further suppressed.

ここで、研磨層と両面テープとの間に入れるPETフィルムの厚さの数値範囲について述べる。 Here, the numerical range of the thickness of the PET film inserted between the polishing layer and the double-sided tape will be described.

厚さが50μm、100μm、125μm、188μm、210μm、350μm、500μmのPETフィルムを準備して、研磨層に貼り付けた後、両面テープを付けて定盤に固定し、目視と触診によりエアー溜まりの有無の確認を行った。なお、表1において0μmとは、PETフィルムを使用していない、従来の研磨パッドのことを意味する。 Prepare PET films with thicknesses of 50 μm, 100 μm, 125 μm, 188 μm, 210 μm, 350 μm, and 500 μm, attach them to the polishing layer, attach double-sided tape and fix them on the surface plate, and visually and palpate the air pool. The presence or absence was confirmed. In Table 1, 0 μm means a conventional polishing pad that does not use a PET film.

PETフィルムの厚さに応じた残エアー(エアー溜まり)の有無を表1に示す。 Table 1 shows the presence or absence of residual air (air pool) according to the thickness of the PET film.

Figure 2021100073
Figure 2021100073

表1に示すように、厚さが125μm未満であるPETフィルムでは、定盤と研磨パッドとの間にエアーが残っていた。一方、PETフィルムの厚さが500μmを超えた場合、コストがかかりすぎてしまうという問題がある。そこで、PETフィルムの厚さは、125μm以上500μm以下とする。 As shown in Table 1, in the PET film having a thickness of less than 125 μm, air remained between the surface plate and the polishing pad. On the other hand, if the thickness of the PET film exceeds 500 μm, there is a problem that the cost is too high. Therefore, the thickness of the PET film is 125 μm or more and 500 μm or less.

次に、本発明の研磨パッドと従来の研磨パッドについて、真直度測定機により定盤に固定された研磨パッドの表面凹凸を測定した。図2は従来の研磨パッド表面を真直度測定機により測定した結果を示した図である。また、図3は本発明の研磨パッド表面を真直度測定機により測定した結果を示した図である。図2、3に示すように、本発明の研磨パッドを用いた場合は研磨パッド表面の凸がないことが確認できたが、従来の研磨パッドを用いた場合は、エアー溜まりの発生による研磨パッド表面の凸があることが確認できた。 Next, with respect to the polishing pad of the present invention and the conventional polishing pad, the surface unevenness of the polishing pad fixed to the surface plate was measured by a straightness measuring machine. FIG. 2 is a diagram showing the results of measuring the surface of a conventional polishing pad with a straightness measuring machine. Further, FIG. 3 is a diagram showing the results of measuring the surface of the polishing pad of the present invention with a straightness measuring machine. As shown in FIGS. 2 and 3, it was confirmed that the surface of the polishing pad was not convex when the polishing pad of the present invention was used, but when the conventional polishing pad was used, the polishing pad due to the generation of air pools. It was confirmed that the surface was convex.

さらに、上述した本発明の研磨パッドを用いて半導体ウェーハの表面を研磨する半導体ウェーハの加工方法を行うことによって、半導体ウェーハ表面のNanotopo品質を向上させることができる。 Further, by performing the method for processing a semiconductor wafer in which the surface of the semiconductor wafer is polished using the polishing pad of the present invention described above, the Nanotopo quality of the surface of the semiconductor wafer can be improved.

以下、実施例を挙げて本発明について詳細に説明するが、これは本発明を限定するものではない。 Hereinafter, the present invention will be described in detail with reference to examples, but this does not limit the present invention.

(実施例)
研磨層と両面テープとの間に厚さが188μmであるPETフィルムを入れた研磨パッドを用いて、片面研磨機による半導体ウェーハの研磨を行った。
(Example)
A semiconductor wafer was polished by a single-sided polishing machine using a polishing pad in which a PET film having a thickness of 188 μm was inserted between the polishing layer and the double-sided tape.

具体的には、はじめに、研磨パッドの研磨層の溝がある面の反対面に、厚さが40μmである接着層を設けて、厚さが188μmであるPETフィルムを接着した。次に厚さが188μmであるPETフィルムに、厚さが25μmであるPETフィルムの両面にそれぞれ厚さが40μmである接着層を有する両面テープを貼り付けた。 Specifically, first, an adhesive layer having a thickness of 40 μm was provided on the opposite surface of the polishing pad to the grooved surface, and a PET film having a thickness of 188 μm was adhered. Next, a double-sided tape having an adhesive layer having a thickness of 40 μm was attached to both sides of the PET film having a thickness of 25 μm on a PET film having a thickness of 188 μm.

研磨条件は、以下に示す条件とした。なお、比較例においても共通である。
装置 :片面研磨機
ウェーハ :直径300mm P−品
研磨スラリ :コロイダルシリカ入り溶液
The polishing conditions were as shown below. It is also common in the comparative example.
Equipment: Single-sided polishing machine Wafer: Diameter 300 mm P-product Polishing slurry: Solution containing colloidal silica

研磨加工した半導体ウェーハのNanotopoを測定した。Nanotopoを測定する装置はKLA社のWaferSight−2で、フィルタにSQMM 2mmを用いた。 Nanotopo of the polished semiconductor wafer was measured. The device for measuring Nanotopo was WaferSight-2 manufactured by KLA Corporation, and SQMM 2 mm was used as a filter.

(比較例)
研磨層と両面テープとの間にPETフィルムが入っていない研磨パッドを用いて、片面研磨機による研磨を行った。
(Comparison example)
Polishing was performed by a single-sided polishing machine using a polishing pad containing no PET film between the polishing layer and the double-sided tape.

研磨条件とNanotopoを測定する装置は実施例と同様である。 The apparatus for measuring the polishing conditions and Nanotopo is the same as in the examples.

研磨加工を行った半導体ウェーハのNanotopoを測定した結果を図4に示す。図4では、比較例の研磨パッドを用いた場合の半導体ウェーハのNanotopoを1として規格化している。実施例の研磨パッドを用いて研磨加工を行った半導体ウェーハのNanotopoは1未満であり、本発明の研磨パッドを用いればNanotopoが改善することが確認できた。 FIG. 4 shows the results of measuring Nanotopo of the polished semiconductor wafer. In FIG. 4, Nanotopo of the semiconductor wafer when the polishing pad of the comparative example is used is standardized as 1. The Nanotopo of the semiconductor wafer subjected to the polishing process using the polishing pad of the example was less than 1, and it was confirmed that the Nanotopo was improved by using the polishing pad of the present invention.

なお、本発明は、上記実施形態に限定されるものではない。上記実施形態は例示であり、本発明の特許請求の範囲に記載された技術的思想と実質的に同一な構成を有し、同様な作用効果を奏するものは、いかなるものであっても本発明の技術的範囲に包含される。 The present invention is not limited to the above embodiment. The above-described embodiment is an example, and any object having substantially the same configuration as the technical idea described in the claims of the present invention and exhibiting the same effect and effect is the present invention. Is included in the technical scope of.

1…研磨層、
2…両面テープ、
2a…PETフィルム、
2b…接着層、
2c…接着層、
3…PETフィルム、
4…接着層、
5…定盤、
6…エアー溜まり、
7…溝、
10…研磨パッド(本発明)、
20…研磨パッド(従来)。
1 ... Polishing layer,
2 ... Double-sided tape,
2a ... PET film,
2b ... Adhesive layer,
2c ... Adhesive layer,
3 ... PET film,
4 ... Adhesive layer,
5 ... Surface plate,
6 ... Air pool,
7 ... groove,
10 ... Polishing pad (invention),
20 ... Polishing pad (conventional).

研磨加工で用いる研磨パッドは、加工するウェーハ面へのスラリ持ち込みを目的に、スパイラル、亀甲、図6に示したような格子等のパターンの溝が研磨パッド表面の研磨層に形成されることがある。これらのパターンの溝により、軟質研磨パッドである不織布パッドや、発ウレタンタイプのShore A 35以下のパッドでは、研磨定盤に固定する時に、溝部近傍にエアー溜まりが発生することがある。そのエアー溜まりにより研磨パッド表面が盛り上がり、この盛り上がりによる研磨パッド表面の凹凸が加工ウェーハ表面に転写されてNanotopo品質を悪化させることがある。 In the polishing pad used in the polishing process, grooves of a pattern such as a spiral, a hexagonal shell, and a lattice as shown in FIG. 6 may be formed in the polishing layer on the surface of the polishing pad for the purpose of bringing the slurry to the wafer surface to be processed. is there. The grooves of these patterns, or non-woven fabric pad is soft polishing pad, the Shore A 35 or less pads foamed urethane type, when fixing the polishing platen, it may accumulate air is generated in the vicinity of the groove. The air pool causes the surface of the polishing pad to swell, and the unevenness of the surface of the polishing pad due to the swelling may be transferred to the surface of the processed wafer, deteriorating the Nanotopo quality.

Claims (3)

研磨層と、該研磨層の片面に積層された両面テープとを有する研磨パッドであって、
前記研磨層と前記両面テープとの間に、厚さが125μm以上500μm以下であるPETフィルムを有することを特徴とする研磨パッド。
A polishing pad having a polishing layer and a double-sided tape laminated on one side of the polishing layer.
A polishing pad having a PET film having a thickness of 125 μm or more and 500 μm or less between the polishing layer and the double-sided tape.
前記PETフィルムと前記研磨層との間に接着層を有することを特徴とする請求項1に記載の研磨パッド。 The polishing pad according to claim 1, wherein an adhesive layer is provided between the PET film and the polishing layer. 請求項1又は2に記載の研磨パッドを用いて半導体ウェーハの表面を研磨することを特徴とする半導体ウェーハの加工方法。 A method for processing a semiconductor wafer, which comprises polishing the surface of the semiconductor wafer using the polishing pad according to claim 1 or 2.
JP2019231846A 2019-12-23 2019-12-23 Polishing pad and method for processing semiconductor wafer using the same Pending JP2021100073A (en)

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