JP2022172453A - 研磨パッド、研磨パッドの製造方法およびこれを用いた半導体素子の製造方法 - Google Patents
研磨パッド、研磨パッドの製造方法およびこれを用いた半導体素子の製造方法 Download PDFInfo
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- JP2022172453A JP2022172453A JP2022075508A JP2022075508A JP2022172453A JP 2022172453 A JP2022172453 A JP 2022172453A JP 2022075508 A JP2022075508 A JP 2022075508A JP 2022075508 A JP2022075508 A JP 2022075508A JP 2022172453 A JP2022172453 A JP 2022172453A
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- SLCVBVWXLSEKPL-UHFFFAOYSA-N neopentyl glycol Chemical compound OCC(C)(C)CO SLCVBVWXLSEKPL-UHFFFAOYSA-N 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 150000002902 organometallic compounds Chemical class 0.000 description 1
- UKODFQOELJFMII-UHFFFAOYSA-N pentamethyldiethylenetriamine Chemical compound CN(C)CCN(C)CCN(C)C UKODFQOELJFMII-UHFFFAOYSA-N 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 229920002857 polybutadiene Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 229920005906 polyester polyol Polymers 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 229920005749 polyurethane resin Polymers 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- ULWHHBHJGPPBCO-UHFFFAOYSA-N propane-1,1-diol Chemical compound CCC(O)O ULWHHBHJGPPBCO-UHFFFAOYSA-N 0.000 description 1
- 239000011226 reinforced ceramic Substances 0.000 description 1
- 239000002990 reinforced plastic Substances 0.000 description 1
- 230000000979 retarding effect Effects 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 238000000790 scattering method Methods 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 229920000468 styrene butadiene styrene block copolymer Polymers 0.000 description 1
- 229920001935 styrene-ethylene-butadiene-styrene Polymers 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 description 1
- CZDYPVPMEAXLPK-UHFFFAOYSA-N tetramethylsilane Chemical compound C[Si](C)(C)C CZDYPVPMEAXLPK-UHFFFAOYSA-N 0.000 description 1
- KSBAEPSJVUENNK-UHFFFAOYSA-L tin(ii) 2-ethylhexanoate Chemical compound [Sn+2].CCCCC(CC)C([O-])=O.CCCCC(CC)C([O-])=O KSBAEPSJVUENNK-UHFFFAOYSA-L 0.000 description 1
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 1
- CYRMSUTZVYGINF-UHFFFAOYSA-N trichlorofluoromethane Chemical compound FC(Cl)(Cl)Cl CYRMSUTZVYGINF-UHFFFAOYSA-N 0.000 description 1
- 229940029284 trichlorofluoromethane Drugs 0.000 description 1
- WDIWAJVQNKHNGJ-UHFFFAOYSA-N trimethyl(propan-2-yl)silane Chemical compound CC(C)[Si](C)(C)C WDIWAJVQNKHNGJ-UHFFFAOYSA-N 0.000 description 1
- WNWMJFBAIXMNOF-UHFFFAOYSA-N trimethyl(propyl)silane Chemical compound CCC[Si](C)(C)C WNWMJFBAIXMNOF-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- B24—GRINDING; POLISHING
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- B24B37/00—Lapping machines or devices; Accessories
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- 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
- B24B37/105—Lapping machines or devices; Accessories designed for working plane surfaces characterised by the movement of the work or lapping tool for single side lapping the workpieces or work carriers being actively moved by a drive, e.g. in a combined rotary and translatory movement
- B24B37/107—Lapping machines or devices; Accessories designed for working plane surfaces characterised by the movement of the work or lapping tool for single side lapping the workpieces or work carriers being actively moved by a drive, e.g. in a combined rotary and translatory movement in a rotary movement only, about an axis being stationary during lapping
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- B24—GRINDING; POLISHING
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- B24B37/00—Lapping machines or devices; Accessories
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- B24B37/00—Lapping machines or devices; Accessories
- B24B37/11—Lapping tools
- B24B37/20—Lapping pads for working plane surfaces
- B24B37/24—Lapping pads for working plane surfaces characterised by the composition or properties of the pad materials
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- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B57/00—Devices for feeding, applying, grading or recovering grinding, polishing or lapping agents
- B24B57/02—Devices for feeding, applying, grading or recovering grinding, polishing or lapping agents for feeding of fluid, sprayed, pulverised, or liquefied grinding, polishing or lapping agents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D18/00—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for
- B24D18/0072—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for using adhesives for bonding abrasive particles or grinding elements to a support, e.g. by gluing
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- 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
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Abstract
Description
dRa1は、研磨前の研磨層の表面粗さおよびウィンドウの表面粗さに対する差であり、
dRa2は、研磨層にか焼セリアスラリーを200mL/分で供給し、ウエハの荷重が6.0psiであり、150rpmの速度で60秒間酸化膜(Oxide)を研磨し、前記条件下でウエハ100枚を研磨した後に測定された研磨層の表面粗さおよびウィンドウの表面粗さに対する差である。
dRa1は、研磨前の研磨層の表面粗さおよびウィンドウの表面粗さに対する差であり、
dRa2は、研磨層にか焼セリアスラリーを200mL/分で供給し、ウエハの荷重が6.0psiであり、150rpmの速度で60秒間酸化膜(Oxide)を研磨し、前記条件下でウエハ100枚を研磨した後に測定された研磨層の表面粗さおよびウィンドウの表面粗さに対する差である。
dRa1は、研磨前の研磨層の表面粗さおよびウィンドウの表面粗さに対する差であり、
dRa2は、研磨層にか焼セリアスラリーを200mL/分で供給し、ウエハの荷重が6.0psiであり、150rpmの速度で60秒間酸化膜(Oxide)を研磨し、前記条件下でウエハ100枚を研磨した後に測定された研磨層の表面粗さおよびウィンドウの表面粗さに対する差である。
Rawiは、ウィンドウの研磨前の表面粗さ(Ra)であり、
Rawfは、研磨層にか焼セリアスラリーを200mL/分で供給し、ウエハの荷重が6.0psiであり、150rpmの速度で60秒間酸化膜(Oxide)を研磨し、前記条件下でウエハ100枚を研磨した後に測定されたウィンドウの表面粗さ(Ra)である。
Rapiは、研磨層の研磨前の表面粗さ(Ra)であり、
Rapfは、研磨層にか焼セリアスラリーを200mL/分で供給し、ウエハの荷重が6.0psiであり、150rpmの速度で60秒間酸化膜(Oxide)を研磨し、前記条件下でウエハ100枚を研磨した後に測定された研磨層の表面粗さ(Ra)である。
研磨パッドの製造
1-1.研磨層の製造
ウレタン系プレポリマー、硬化剤、固相発泡剤の混合物注入ラインが備えられたキャスティング装置において、プレポリマータンクに未反応NCOを9重量%で有するウレタン系プレポリマーを充填し、硬化剤タンクにビス(4-アミノ-3-クロロフェニル)メタン(bis(4-amino-3-chlorophenyl)methane、Ishihara社製品)を充填した。また、前記ウレタン系プレポリマー100重量部に対して、3重量部の固相発泡剤を予め混合した後、プレポリマータンクに注入した。
ウレタン系プレポリマーとして未反応NCOの含有量が8.5重量%のPUGL-500D(SKC社製品)を用い、原料混合時、不活性ガスを注入せず、注入された原料は後モールド(横1,000mm、縦1,000mm、高さ50mm)に注入したことを除けば、実施例1-1と同様の方法でウィンドウを製造した。前記シート状のウィンドウを、上面と下面の厚さを合わせるために、切削面が平らな形状に角部が曲率0.5mmを有する工業用PCDダイヤモンドで製作されたバイトを用いて、2.0mmの厚さに成形した後、横20mm、縦60mmサイズの冷間金型用鋼SKD11で製作されたエンボス金型でカッティングした。
1.1Tの厚さの不織布タイプの支持層(製造会社:PTS、製品名:ND-5400H)を用いた。
前記実施例1-1の研磨層を横20mmおよび縦60mmに打ち抜いて第1貫通ホールを形成し、前記実施例1-3の支持層を横16mmおよび縦56mmに打ち抜いて第2貫通ホールを形成した。以後、前記支持層と研磨層をホットメルトフィルム(製造会社:SKC、製品名:TF-00)を用いて120℃で熱融着し、前記支持層の他面に両面接着剤(製造会社:3M、製品名:442JS)を接着し、第2貫通ホールだけ両面接着剤を切削して除去した。以後、第2貫通ホールだけ前記両面接着剤を切削して除去し、前記第1貫通ホールに実施例1-2のウィンドウを挿入し、前記両面接着剤に接着して研磨パッドを製造した。
前記実施例1の1-1、1-3および1-4は同様に製造し、ウィンドウブロックの製造において次のように実施した。ウレタン系プレポリマーとして未反応NCOの含有量が8.5重量%のPUGL-500D(SKC社製品)を用い、原料混合時、不活性ガスを注入せず、注入された原料は後モールド(横1,000mm、縦1,000mm、高さ50mm)に注入したことを除けば、実施例1-1と同様の方法でウィンドウを製造した。前記シート状のウィンドウを、上面と下面の厚さを合わせるために、切削面が平らな形状に角部が曲率3mmを有する工業用PCDダイヤモンドで製作されたバイトを用いて、2.0mmの厚さに成形した後、横20mm、縦60mmサイズの一般の鉄板で製作されたエンボス金型の刃が木型平板体に付着した金型を用いてカッティングした。
前記実施例1の1-1、1-3および1-4は同様に製造し、ウィンドウブロックの製造において次のように実施した。ウレタン系プレポリマーとして未反応NCOの含有量が8.5重量%のPUGL-500D(SKC社製品)を用い、原料混合時、不活性ガスを注入せず、注入された原料は後モールド(横1,000mm、縦1,000mm、高さ50mm)に注入したことを除けば、実施例1-1と同様の方法でウィンドウを製造した。前記シート状のウィンドウを、上面と下面の厚さを合わせるために、切削面が平らな形状に角部が曲率3mmを有する一般の刃で製作されたバイトを用いて、2.0mmの厚さに成形した後、横20mm、縦60mmサイズの一般の鉄板で製作されたエンボス金型の刃が木型平板体に付着した金型を用いてカッティングした。
表面粗さの測定
直径300mmのシリコンウエハに酸化ケイ素を化学気相蒸着(CVD)工程によって蒸着した。CMP装置に実施例および比較例の研磨パッドを付着させ、シリコンウエハの酸化層が研磨パッドの研磨面を向くように設けた。研磨パッド上にか焼セリアスラリーを200mL/分の速度で供給しながら、6.0psiの荷重および150rpmの速度で6000秒間ダミーウエハを研磨した。この時、In-situでコンディショナCI45(SAESOL社)を用い、6lbの荷重でコンディショニングをしながら進行させた。
か焼セリアスラリーの組成:か焼セリア(0.5)wt%およびDI water(99.4)wt%、ポリアクリレート系添加剤(0.1wt%)
か焼セリア:150nm(スキャタリング方式測定)
コンディショナスペック:CI-45(SAESOLダイヤモンド)
Rawfは、ウィンドウの研磨後の表面粗さ(Ra)であり、
Rapiは、研磨層の研磨前の表面粗さ(Ra)であり、
Rapfは、研磨層の研磨後の表面粗さ(Ra)であり、
dRa1は、研磨層およびウィンドウの研磨前の表面粗さの差であり、
dRa2は、研磨層およびウィンドウの研磨後の表面粗さの差である。
終点検出性能評価
CMP装置に実施例および比較例の研磨パッドを付着させ、シリコンウエハのOxide層が研磨パッドの研磨面を向けるように設けた。研磨パッド上にか焼セリアスラリーを200mL/分の速度で供給しながら、6.0psiの荷重および150rpmの速度でOxide膜を研磨してウエハを研磨した。この時、In-situでコンディショナCI45(SAESOL)を用い、6lbの荷重でコンディショニングをしながら進行させた。実施例および比較例の研磨パッドに対して終点検出が可能か否かを確認した。
120:定盤
130:半導体基板
140:ノズル
150:研磨スラリー
160:研磨ヘッド
170:コンディショナ
200:研磨層
210:研磨前の研磨面に対する表面粗さ
220:研磨工程後の研磨面に対する表面粗さ
300:ウィンドウ
310:研磨前のウィンドウ表面に対する表面粗さ
320:研磨工程後のウィンドウ表面に対する表面粗さ
Claims (10)
- 前記ウィンドウは、ウレタン系プレポリマーおよび硬化剤を含むウィンドウ組成物を硬化させた硬化物を含む、
請求項1に記載の研磨パッド。 - 前記ウレタン系プレポリマーは、未反応NCO%が8~10%である、
請求項4に記載の研磨パッド。 - 前記研磨層は、ウレタン系プレポリマー、硬化剤、および発泡剤を含む研磨組成物を硬化させた硬化物を含む、
請求項1に記載の研磨パッド。 - i)ウレタン系プレポリマー組成物を製造するステップと、
ii)前記プレポリマー組成物および硬化剤を含むウィンドウ製造用組成物を製造するステップと、
iii)前記ウィンドウ製造用組成物を硬化してウィンドウを製造するステップと、
iv)研磨層に貫通ホールを形成し、前記貫通ホールにiii)ステップのウィンドウを成形し、挿入および接着するステップとを含み、
前記研磨層および終点検出用ウィンドウの表面粗さ(Ra)は、下記式1で表される表面粗さの差に対する変化率(SRR)が1.5~2.5である、
研磨パッドの製造方法:
ここで、
dRa1は、研磨前の研磨層の表面粗さおよびウィンドウの表面粗さに対する差であり、
dRa2は、研磨層にか焼セリアスラリーを200mL/分で供給し、ウエハの荷重が6.0psiであり、150rpmの速度で60秒間酸化膜(Oxide)を研磨し、前記条件下でウエハ100枚を研磨した後に測定された研磨層の表面粗さおよびウィンドウの表面粗さに対する差である。 - 前記iv)のウィンドウを成形するステップは、
硬化したウィンドウシートを角部の曲率が0.3~5mmのバイトを用いてウィンドウシートの厚さを1次成形し、エンボス金型で2次成形するものである、
請求項7に記載の研磨パッドの製造方法。 - 前記バイトは、PCDバイトである、
請求項8に記載の研磨パッドの製造方法。 - 1)研磨層および終点検出用ウィンドウを含む研磨パッドを提供するステップと、
2)前記研磨層の研磨面に半導体基板の被研磨面が当接するように相対回転させながら前記半導体基板を研磨させるステップと、
3)前記研磨パッド内の終点検出用ウィンドウを介して半導体基板の厚さを検知し、研磨工程の終了時点を検出するステップとを含み、
前記研磨層および終点検出用ウィンドウの表面粗さ(Ra)は、下記式1で表される表面粗さの差に対する変化率(SRR)が1.5~2.5である、
半導体素子の製造方法:
ここで、
dRa1は、研磨前の研磨層の表面粗さおよびウィンドウの表面粗さに対する差であり、
dRa2は、研磨層にか焼セリアスラリーを200mL/分で供給し、ウエハの荷重が6.0psiであり、150rpmの速度で60秒間酸化膜(Oxide)を研磨し、前記条件下でウエハ100枚を研磨した後に測定された研磨層の表面粗さおよびウィンドウの表面粗さに対する差である。
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