WO2023095503A1 - テンプレートアセンブリ、研磨ヘッド及びウェーハの研磨方法 - Google Patents
テンプレートアセンブリ、研磨ヘッド及びウェーハの研磨方法 Download PDFInfo
- Publication number
- WO2023095503A1 WO2023095503A1 PCT/JP2022/039255 JP2022039255W WO2023095503A1 WO 2023095503 A1 WO2023095503 A1 WO 2023095503A1 JP 2022039255 W JP2022039255 W JP 2022039255W WO 2023095503 A1 WO2023095503 A1 WO 2023095503A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- wafer
- polishing
- back pad
- template assembly
- supporting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Images
Classifications
-
- 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
- B24B37/30—Work carriers for single side lapping of plane surfaces
- B24B37/32—Retaining rings
-
- 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
- B24B37/10—Lapping machines or devices; Accessories designed for working plane surfaces characterised by the movement of the work or lapping tool for single 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
- B24B37/27—Work carriers
- B24B37/30—Work carriers for single side lapping of plane surfaces
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P52/00—Grinding, lapping or polishing of wafers, substrates or parts of devices
Definitions
- the present invention relates to a template assembly, a polishing head, and a wafer polishing method.
- the general flow of semiconductor wafer polishing is double-side polishing (DSP) followed by single-side polishing (CMP) for secondary polishing and final polishing.
- Polishing using a single-sided polisher primarily employs a polishing head that includes a template assembly for supporting the wafer.
- This template assembly has a back pad and a guide ring on its outer periphery, and the wafer is supported in the area surrounded by the back pad and guide ring.
- the wafer supporting surface is a back pad, which is pressurized during polishing to bring the wafer into sliding contact with a polishing pad (polishing cloth) attached to a surface plate.
- Patent Document 1 a single-side polishing apparatus is used to polish the wafer so that the rotation rate of the wafer is 25 degrees/min or more and 60 degrees/min or less, and the amount of flatness variation in the circumferential direction of the outer peripheral portion of the wafer is measured. is described to reduce
- Patent Document 2 describes a polishing method in which scratches do not occur in the final step of single-sided polishing by a method of polishing in a multi-stage polishing process using double-sided polishing and a single-sided polishing apparatus.
- Patent Document 3 describes a manufacturing method capable of reclaiming a reclaimed wafer for a 0.13 ⁇ m device process, in which the reclaimed wafer is polished on both sides and then polished on one side to reduce the thickness by 50 ⁇ m or less. .
- Patent Document 4 describes a polishing method using a wafer holder for a single-sided polishing apparatus, in which the holding pad has a thickness of 0.25 to 1.0 mm and the holding portion has a depth of 40 to 150 ⁇ m. It is
- Patent Document 5 discloses a retainer ring for a substrate holding device that holds a substrate and presses it against a polishing pad, comprising an inner ring and an outer ring, the inner ring having a radial thickness of 0.05 mm or more and 5 mm or less. , a polishing method using a retainer ring in which the surface roughness Ra of the lower surface of the retainer ring is 1.6 ⁇ m or less.
- Patent Document 6 describes a polishing method using a retaining ring of a single-sided polishing apparatus, in which the inner wall of the inner ring is polished to a surface roughness Ra of less than 30 microinches.
- the present invention has been made to solve the above problems, and provides a wafer support for single-sided polishing of a wafer capable of improving the uniformity in the circumferential direction of the edge flatness of the wafer after single-sided polishing such as CMP. It is an object of the present invention to provide a template assembly, a polishing head equipped with the same, and a wafer polishing method using the polishing head.
- the present invention has been made to achieve the above objects, and provides a template assembly for supporting a wafer used for single-sided polishing of a wafer, comprising a back pad and a guide fixed along the outer periphery of the back pad.
- the back pad has a radial shape profile PV value of 0.9 mm or less on the surface that supports the wafer, and a surface roughness Ra of the surface that supports the wafer is 1.1 ⁇ m or less.
- the polishing head can be provided with the template assembly according to the present invention and a retainer ring arranged at a position corresponding to the guide ring portion.
- the polishing head can improve the uniformity in the circumferential direction of the edge flatness of the wafer after single-sided polishing.
- the above polishing head according to the present invention can be used to polish the wafer while pressing it against the polishing pad.
- the template assembly of the present invention it is possible to improve the uniformity of the edge flatness in the circumferential direction and the uniformity of the in-plane flatness of the wafer after single-sided polishing. .
- the cross-sectional schematic diagram of a polishing head is shown.
- the shape profile (PV value) measurement direction of the back pad is shown.
- the PV values of the back pads used in Examples and Comparative Examples are shown.
- the surface roughness Ra of the back pads used in Examples and Comparative Examples is shown. 4 shows flatness evaluation results of Examples and Comparative Examples.
- the shape of the back pad has undulations, and even if an attempt is made to increase the rotation of the wafer, this undulation is transferred to the wafer as a load distribution, and the polishing head and the polishing head continue to polish the undulations. As a result, the uniformity of the edge flatness of the wafer in the circumferential direction is reduced (deteriorated).
- a wafer-supporting template assembly used for single-sided polishing of a wafer comprises a back pad and the back pad. and a guide ring portion fixed along the outer peripheral portion, and the back pad has a surface roughness of the surface supporting the wafer and a PV value of the shape profile in the radial direction of the surface supporting the wafer of 0.9 mm or less. It has been found that a template assembly having an Ra of 1.1 ⁇ m or less can improve the uniformity of edge flatness in the circumferential direction and improve the uniformity of flatness in the plane. completed.
- FIG. 1 shows a schematic cross-sectional view of a polishing head used for single-sided polishing of a wafer.
- the polishing head 100 includes a template assembly 3 and a retainer ring 4 arranged at a position corresponding to the guide ring portion 2 of the template assembly 3 .
- the template assembly 3 is attached onto the retainer ring 4 so that the retainer ring 4 is positioned at a position corresponding to the guide ring portion 2 .
- the outer peripheral portion of the back pad 1 is sandwiched between the retainer ring 4 and the guide ring portion 2 .
- a retainer ring 4 is secured along the outer periphery of the upper flange assembly 6 .
- a space surrounded by the back plate 7, the back pad 1, and the retainer ring 4 serves as a back pad pressurizing portion (fluid sealing portion) 5, which is a fluid sealing portion.
- a wafer-supporting template assembly 3 comprises a back pad 1 and a guide ring portion 2 fixed along the outer periphery of the back pad 1 .
- the PV (Peak-to-Valley) value of the shape profile in the radial direction on the surface supporting the wafer is 0.9 mm or less, and the surface roughness Ra of the surface supporting the wafer is 1.1 ⁇ m or less. belongs to.
- the contact resistance with the wafer increases, so the rotation of the wafer can be effectively promoted. As a result, it is possible to improve the uniformity of the edge flatness in the circumferential direction.
- the lower limit of the PV value of the shape profile in the radial direction on the wafer supporting surface is 0.0 mm or more, and the lower limit of the surface roughness Ra of the wafer supporting surface is 0.0 ⁇ m. That's it.
- the back pad for example, a layer of urethane foam is formed on a base layer such as a polyurethane foam sheet, non-woven fabric sheet, or PET (polyethylene terephthalate) film.
- a base layer such as a polyurethane foam sheet, non-woven fabric sheet, or PET (polyethylene terephthalate) film.
- the roughness Ra is obtained by changing the number of diamond abrasive grains on the surface of the buffing wheel that adjusts the surface roughness after forming urethane foam on the base material. can produce back pads with different roughness.
- the PV value of the shape profile can be changed by changing the PET material used as the base material, the material such as the nonwoven fabric sheet, etc., so that back pads with different PV values of the shape profile can be produced.
- Various shapes of back pads can be obtained by changing the manufacturing conditions of such a back pad.
- the shape of the back pad can be measured using a known measuring device.
- the PV value of the shape profile in the radial direction on the wafer supporting surface of the back pad can be calculated by measuring the shape profile in the radial direction as indicated by the arrow in FIG. 2 with a three-dimensional shape measuring machine.
- the surface roughness Ra of the back pad can be measured using a contact roughness measuring machine.
- Template assembly Template assemblies were prepared with backpads having various shapes.
- Comparative Example 1 is a conventionally used template assembly (conventional product).
- the PV value of Comparative Example 2 does not satisfy the conditions of the present invention, and the surface roughness Ra of Comparative Example 3 does not satisfy the conditions of the present invention.
- a three-dimensional shape measuring machine using a laser probe was used to measure the shape of the back pad of the template assembly.
- the template assembly was attached to a ceramic retainer ring, the head assembly assembled was placed on a pedestal, and the measurement was performed with the template side facing upward.
- the radial direction measurement of the surface supporting the wafer is performed by scanning the entire surface with a laser probe type three-dimensional shape measuring machine XYZAX-SVA manufactured by Tokyo Seimitsu.
- a PV (Peak-to-Valley) value of the shape profile was obtained.
- FIG. 3 shows the PV values of the radial shape profiles of the wafer-supporting surfaces of the back pads used in Examples 1 and 2 and Comparative Examples 1-3.
- FIG. 4 shows the surface roughness Ra of the wafer-supporting surface of the back pads used in Examples 1 and 2 and Comparative Examples 1-3.
- polishing For the evaluation, a silicon wafer with a diameter of 300 mm, which was subjected to double-sided polishing and SC1 cleaning, was used. The thickness of the wafer used is 775 ⁇ m. The number of polished wafers was 25 for each example and comparative example.
- a polishing pad made of urethane-impregnated non-woven fabric is attached to a ceramic surface plate, and while polishing slurry of a KOH-based alkaline aqueous solution (pH 11) containing silica-based abrasive grains is supplied onto the polishing pad, the polishing head and the surface plate are moved. This was done by rotating the wafer at 40 rpm and bringing the wafer into sliding contact. The polishing allowance was set to 300 nm.
- the present invention is not limited to the above embodiments.
- the above-described embodiment is an example, and any device having substantially the same configuration as the technical idea described in the claims of the present invention and exhibiting the same effect is the present invention. included in the technical scope of
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
- Mechanical Treatment Of Semiconductor (AREA)
Abstract
Description
図1に、ウェーハの片面研磨に用いる研磨ヘッドの断面模式図を示す。図1に示すように、研磨ヘッド100は、テンプレートアセンブリ3と、テンプレートアセンブリ3のガイドリング部2に対応する位置に配置されたリテーナリング4とを具備している。テンプレートアセンブリ3は、ガイドリング部2に対応する位置にリテーナリング4が位置するように、リテーナリング4上に貼り付けられている。それにより、バックパッド1の外周部が、リテーナリング4とガイドリング部2との間に挟まれている。さらに、図1の例に示す研磨ヘッド100は、裏板7と、リテーナリング4のテンプレートアセンブリ3とは反対側に配置された上部フランジアセンブリ6等をさらに具備している。上部フランジアセンブリ6の外周部に沿って、リテーナリング4が固定されている。裏板7とバックパッド1とリテーナリング4とに囲まれた空間は、流体封入部であるバックパッド加圧部(流体封入部)5となっている。
ウェーハ支持用のテンプレートアセンブリ3は、バックパッド1と、バックパッド1の外周部に沿って固定されたガイドリング部2とを具備している。本発明に係るバックパッドは、ウェーハを支持する面における径方向の形状プロファイルのPV(Peak-to-Valley)値が0.9mm以下、ウェーハを支持する面の表面粗さRaが1.1μm以下のものである。このようなバックパッドであれば、ウェーハとの接触抵抗が大きくなるため、ウェーハの自転を効果的に促進することが可能となる。その結果、エッジフラットネスの周方向の均一性を高めることが可能となる。なお、本発明に係るバックパッドの、ウェーハを支持する面における径方向の形状プロファイルのPV値の下限値は0.0mm以上、ウェーハを支持する面の表面粗さRaの下限値は0.0μm以上である。
様々な形状を有するバックパッドを備えたテンプレートアセンブリを準備した。比較例1は、従来使用していたテンプレートアセンブリ(従来品)である。比較例2はPV値が本発明の条件を満たさないもの、比較例3は表面粗さRaが本発明の条件を満たさないものである。
評価には、両面研磨を行いSC1洗浄を行った直径300mmのシリコンウェーハを用いた。用いたウェーハの厚さは775μmである。研磨枚数は各実施例、比較例につき25枚とした。研磨加工は、セラミック定盤にウレタン含浸不織布製の研磨パッドを貼付け、シリカ系砥粒を含むKOHベースのアルカリ性水溶液(pH11)の研磨スラリーを研磨パッド上に供給しながら、研磨ヘッドと定盤を40rpmで回転させてウェーハを摺接させることで行った。研磨取り代は300nmとした。
研磨したウェーハのフラットネスの測定を行った。フラットネスは、KLA社製WaferSight2+にて測定を行い、研磨前後でのESFQR Rangeの差分(外周除外範囲:E.E.=2mm)を各ウェーハについて求め、各条件25枚加工したうちの平均値を計算した。評価結果を表1、図5に示す。なお、表1には、バックパッドの、ウェーハを支持する面における径方向の形状プロファイルのPV値、バックパッドの、ウェーハを支持する面の表面粗さRa、バックパッド表面の粗さの調節に用いたバフ番手、バックパッドの基材についても記載した。
Claims (3)
- ウェーハの片面研磨に用いるウェーハ支持用のテンプレートアセンブリであって、
前記ウェーハ支持用のテンプレートアセンブリは、バックパッドと、該バックパッドの外周部に沿って固定されたガイドリング部とを具備し、
前記バックパッドは、ウェーハを支持する面における径方向の形状プロファイルのPV値が0.9mm以下、ウェーハを支持する面の表面粗さRaが1.1μm以下のものであることを特徴とするテンプレートアセンブリ。 - 請求項1に記載のテンプレートアセンブリと、
前記ガイドリング部に対応する位置に配置されたリテーナリングと
を具備したものであることを特徴とする研磨ヘッド。 - 請求項2に記載の研磨ヘッドを用いて、ウェーハを研磨パッドに対して押圧しながら研磨することを特徴とするウェーハの研磨方法。
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020247016679A KR20240112840A (ko) | 2021-11-25 | 2022-10-21 | 템플리트 어셈블리, 연마헤드 및 웨이퍼의 연마방법 |
| CN202280077034.3A CN118215557B (en) | 2021-11-25 | 2022-10-21 | Template assembly, grinding head and wafer grinding method |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2021191570A JP7099614B1 (ja) | 2021-11-25 | 2021-11-25 | テンプレートアセンブリ、研磨ヘッド及びウェーハの研磨方法 |
| JP2021-191570 | 2021-11-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2023095503A1 true WO2023095503A1 (ja) | 2023-06-01 |
Family
ID=82384784
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2022/039255 Ceased WO2023095503A1 (ja) | 2021-11-25 | 2022-10-21 | テンプレートアセンブリ、研磨ヘッド及びウェーハの研磨方法 |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP7099614B1 (ja) |
| KR (1) | KR20240112840A (ja) |
| TW (1) | TW202327803A (ja) |
| WO (1) | WO2023095503A1 (ja) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2019155578A (ja) * | 2018-03-16 | 2019-09-19 | 富士紡ホールディングス株式会社 | 保持具及びその製造方法 |
| JP2020028930A (ja) * | 2018-08-21 | 2020-02-27 | 富士紡ホールディングス株式会社 | 被研磨物の保持具 |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20010039101A1 (en) | 2000-04-13 | 2001-11-08 | Wacker Siltronic Gesellschaft Fur Halbleitermaterialien Ag | Method for converting a reclaim wafer into a semiconductor wafer |
| JP2010131683A (ja) | 2008-12-02 | 2010-06-17 | Sumco Corp | シリコンウェーハの研磨方法 |
| JP6439963B2 (ja) | 2014-08-22 | 2018-12-19 | 富士紡ホールディングス株式会社 | 保持具及びその製造方法 |
| JP2016155188A (ja) | 2015-02-24 | 2016-09-01 | 株式会社荏原製作所 | リテーナリング、基板保持装置、研磨装置およびリテーナリングのメンテナンス方法 |
| SG10201601379WA (en) | 2015-03-19 | 2016-10-28 | Applied Materials Inc | Retaining ring for lower wafer defects |
| JP7388324B2 (ja) | 2019-12-05 | 2023-11-29 | 株式会社Sumco | ウェーハの片面研磨方法、ウェーハの製造方法、およびウェーハの片面研磨装置 |
-
2021
- 2021-11-25 JP JP2021191570A patent/JP7099614B1/ja active Active
-
2022
- 2022-10-21 WO PCT/JP2022/039255 patent/WO2023095503A1/ja not_active Ceased
- 2022-10-21 KR KR1020247016679A patent/KR20240112840A/ko active Pending
- 2022-10-26 TW TW111140555A patent/TW202327803A/zh unknown
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2019155578A (ja) * | 2018-03-16 | 2019-09-19 | 富士紡ホールディングス株式会社 | 保持具及びその製造方法 |
| JP2020028930A (ja) * | 2018-08-21 | 2020-02-27 | 富士紡ホールディングス株式会社 | 被研磨物の保持具 |
Also Published As
| Publication number | Publication date |
|---|---|
| TW202327803A (zh) | 2023-07-16 |
| JP2023078014A (ja) | 2023-06-06 |
| CN118215557A (zh) | 2024-06-18 |
| KR20240112840A (ko) | 2024-07-19 |
| JP7099614B1 (ja) | 2022-07-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7582221B2 (en) | Wafer manufacturing method, polishing apparatus, and wafer | |
| KR101486764B1 (ko) | 에피택셜 웨이퍼를 제조하는 방법 및 에피택셜 웨이퍼 | |
| JP3925580B2 (ja) | ウェーハ加工装置および加工方法 | |
| KR100818683B1 (ko) | 경면 면취 웨이퍼, 경면 면취용 연마 클로스 및 경면 면취연마장치 및 방법 | |
| TW200819242A (en) | Carrier for double side polishing device, and double side polishing device and double side polishing method using the carrier | |
| JP5061694B2 (ja) | 研磨パッドの製造方法及び研磨パッド並びにウエーハの研磨方法 | |
| US20140213155A1 (en) | Wafer polishing apparatus and method | |
| TWI727490B (zh) | 晶圓製造方法以及晶圓 | |
| CN1299335C (zh) | 晶片的研磨方法及晶片研磨用研磨垫 | |
| CN105189045B (zh) | 工件的研磨装置 | |
| CN110052955B (zh) | 载体的制造方法及晶圆的双面研磨方法 | |
| JP7099614B1 (ja) | テンプレートアセンブリ、研磨ヘッド及びウェーハの研磨方法 | |
| JP3817771B2 (ja) | 合成石英ガラス基板の研磨方法 | |
| TWI872474B (zh) | 兩面研磨用載具及使用此之矽晶圓的兩面研磨方法及裝置 | |
| CN118215557B (en) | Template assembly, grinding head and wafer grinding method | |
| JPH11285963A (ja) | ウェーハ研磨用研磨布若しくは研磨定盤からなる研磨体及び該研磨体を用いたウェーハ研磨方法 | |
| JP2005005315A (ja) | ウエーハの研磨方法 | |
| JP2001138225A (ja) | 半導体用ウエハの鏡面研磨方法 | |
| JP3611029B2 (ja) | 半導体基板の研磨用保持板 | |
| WO2017125987A1 (ja) | ウェーハの研磨方法、バックパッドの製造方法、バックパッド、及びそのバックパッドを具備する研磨ヘッド | |
| JP7537362B2 (ja) | テンプレートアセンブリ、研磨ヘッド及びウェーハの研磨方法 | |
| WO2018193758A1 (ja) | ウェーハの両面研磨方法および両面研磨装置 | |
| JP3776611B2 (ja) | ワークの研磨加工方法 | |
| JP2004319717A (ja) | 半導体ウェーハの製造方法 |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 22898287 Country of ref document: EP Kind code of ref document: A1 |
|
| ENP | Entry into the national phase |
Ref document number: 20247016679 Country of ref document: KR Kind code of ref document: A |
|
| WWE | Wipo information: entry into national phase |
Ref document number: 202280077034.3 Country of ref document: CN |
|
| NENP | Non-entry into the national phase |
Ref country code: DE |
|
| 122 | Ep: pct application non-entry in european phase |
Ref document number: 22898287 Country of ref document: EP Kind code of ref document: A1 |
