JP6582567B2 - スラリー及びその製造方法、並びに、研磨方法 - Google Patents
スラリー及びその製造方法、並びに、研磨方法 Download PDFInfo
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- JP6582567B2 JP6582567B2 JP2015113040A JP2015113040A JP6582567B2 JP 6582567 B2 JP6582567 B2 JP 6582567B2 JP 2015113040 A JP2015113040 A JP 2015113040A JP 2015113040 A JP2015113040 A JP 2015113040A JP 6582567 B2 JP6582567 B2 JP 6582567B2
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- Prior art keywords
- acid
- slurry
- cerium oxide
- polishing
- oxide particles
- Prior art date
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- 238000005498 polishing Methods 0.000 title claims description 147
- 239000002002 slurry Substances 0.000 title claims description 137
- 238000000034 method Methods 0.000 title claims description 49
- 238000004519 manufacturing process Methods 0.000 title claims description 23
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- 229910000420 cerium oxide Inorganic materials 0.000 claims description 173
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 claims description 173
- 229920001577 copolymer Polymers 0.000 claims description 60
- 239000000178 monomer Substances 0.000 claims description 46
- -1 organic acid compound Chemical class 0.000 claims description 43
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 29
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 23
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 23
- 125000004434 sulfur atom Chemical group 0.000 claims description 22
- 229920000536 2-Acrylamido-2-methylpropane sulfonic acid Polymers 0.000 claims description 20
- XHZPRMZZQOIPDS-UHFFFAOYSA-N 2-Methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid Chemical compound OS(=O)(=O)CC(C)(C)NC(=O)C=C XHZPRMZZQOIPDS-UHFFFAOYSA-N 0.000 claims description 20
- 238000007334 copolymerization reaction Methods 0.000 claims description 19
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- 239000000126 substance Substances 0.000 description 13
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- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 12
- 238000003860 storage Methods 0.000 description 12
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- 125000001273 sulfonato group Chemical group [O-]S(*)(=O)=O 0.000 description 11
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- 125000000217 alkyl group Chemical group 0.000 description 9
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 description 9
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- AGBXYHCHUYARJY-UHFFFAOYSA-N 2-phenylethenesulfonic acid Chemical compound OS(=O)(=O)C=CC1=CC=CC=C1 AGBXYHCHUYARJY-UHFFFAOYSA-N 0.000 description 5
- 238000004833 X-ray photoelectron spectroscopy Methods 0.000 description 5
- 239000006061 abrasive grain Substances 0.000 description 5
- 229910052757 nitrogen Inorganic materials 0.000 description 5
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- 239000000243 solution Substances 0.000 description 5
- NLVXSWCKKBEXTG-UHFFFAOYSA-N vinylsulfonic acid Chemical compound OS(=O)(=O)C=C NLVXSWCKKBEXTG-UHFFFAOYSA-N 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 239000002202 Polyethylene glycol Substances 0.000 description 4
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 4
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- 150000003863 ammonium salts Chemical class 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 4
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- 230000003287 optical effect Effects 0.000 description 4
- KJIFKLIQANRMOU-UHFFFAOYSA-N oxidanium;4-methylbenzenesulfonate Chemical compound O.CC1=CC=C(S(O)(=O)=O)C=C1 KJIFKLIQANRMOU-UHFFFAOYSA-N 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
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- 229920001223 polyethylene glycol Polymers 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 description 4
- CWERGRDVMFNCDR-UHFFFAOYSA-N thioglycolic acid Chemical compound OC(=O)CS CWERGRDVMFNCDR-UHFFFAOYSA-N 0.000 description 4
- WLJVXDMOQOGPHL-PPJXEINESA-N 2-phenylacetic acid Chemical compound O[14C](=O)CC1=CC=CC=C1 WLJVXDMOQOGPHL-PPJXEINESA-N 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 3
- 150000000703 Cerium Chemical class 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- IAJILQKETJEXLJ-UHFFFAOYSA-N Galacturonsaeure Natural products O=CC(O)C(O)C(O)C(O)C(O)=O IAJILQKETJEXLJ-UHFFFAOYSA-N 0.000 description 3
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 3
- ABLZXFCXXLZCGV-UHFFFAOYSA-N Phosphorous acid Chemical compound OP(O)=O ABLZXFCXXLZCGV-UHFFFAOYSA-N 0.000 description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 3
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 3
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000002585 base Substances 0.000 description 3
- 229910052796 boron Inorganic materials 0.000 description 3
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- 150000007942 carboxylates Chemical class 0.000 description 3
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- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 3
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- CDAWCLOXVUBKRW-UHFFFAOYSA-N 2-aminophenol Chemical compound NC1=CC=CC=C1O CDAWCLOXVUBKRW-UHFFFAOYSA-N 0.000 description 2
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- WXUAQHNMJWJLTG-UHFFFAOYSA-N 2-methylbutanedioic acid Chemical compound OC(=O)C(C)CC(O)=O WXUAQHNMJWJLTG-UHFFFAOYSA-N 0.000 description 2
- KPGXRSRHYNQIFN-UHFFFAOYSA-N 2-oxoglutaric acid Chemical compound OC(=O)CCC(=O)C(O)=O KPGXRSRHYNQIFN-UHFFFAOYSA-N 0.000 description 2
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- TWBKZBJAVASNII-UHFFFAOYSA-N pentadecane-1-sulfonic acid Chemical compound CCCCCCCCCCCCCCCS(O)(=O)=O TWBKZBJAVASNII-UHFFFAOYSA-N 0.000 description 1
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- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 125000000843 phenylene group Chemical group C1(=C(C=CC=C1)*)* 0.000 description 1
- 229940081066 picolinic acid Drugs 0.000 description 1
- IUGYQRQAERSCNH-UHFFFAOYSA-N pivalic acid Chemical compound CC(C)(C)C(O)=O IUGYQRQAERSCNH-UHFFFAOYSA-N 0.000 description 1
- 239000002798 polar solvent Substances 0.000 description 1
- 238000007517 polishing process Methods 0.000 description 1
- 108010064470 polyaspartate Proteins 0.000 description 1
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 1
- 239000010318 polygalacturonic acid Substances 0.000 description 1
- 229920002643 polyglutamic acid Polymers 0.000 description 1
- 229920000656 polylysine Polymers 0.000 description 1
- 229920005591 polysilicon Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
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- 229910052700 potassium Inorganic materials 0.000 description 1
- XAEFZNCEHLXOMS-UHFFFAOYSA-M potassium benzoate Chemical compound [K+].[O-]C(=O)C1=CC=CC=C1 XAEFZNCEHLXOMS-UHFFFAOYSA-M 0.000 description 1
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- KCXFHTAICRTXLI-UHFFFAOYSA-N propane-1-sulfonic acid Chemical compound CCCS(O)(=O)=O KCXFHTAICRTXLI-UHFFFAOYSA-N 0.000 description 1
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- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
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- MYOWBHNETUSQPA-UHFFFAOYSA-N tetradecane-1-sulfonic acid Chemical compound CCCCCCCCCCCCCCS(O)(=O)=O MYOWBHNETUSQPA-UHFFFAOYSA-N 0.000 description 1
- IBYFOBGPNPINBU-UHFFFAOYSA-N tetradecenoic acid Natural products CCCCCCCCCCCC=CC(O)=O IBYFOBGPNPINBU-UHFFFAOYSA-N 0.000 description 1
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 1
- NJRXVEJTAYWCQJ-UHFFFAOYSA-N thiomalic acid Chemical compound OC(=O)CC(S)C(O)=O NJRXVEJTAYWCQJ-UHFFFAOYSA-N 0.000 description 1
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- 229910052718 tin Inorganic materials 0.000 description 1
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- TXXHDPDFNKHHGW-ZPUQHVIOSA-N trans,trans-muconic acid Chemical compound OC(=O)\C=C\C=C\C(O)=O TXXHDPDFNKHHGW-ZPUQHVIOSA-N 0.000 description 1
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- SJEYEFOHSMBQIX-UHFFFAOYSA-N undecane-1-sulfonic acid Chemical compound CCCCCCCCCCCS(O)(=O)=O SJEYEFOHSMBQIX-UHFFFAOYSA-N 0.000 description 1
- 229940005605 valeric acid Drugs 0.000 description 1
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Images
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- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
- Mechanical Treatment Of Semiconductor (AREA)
Description
[式(I)中、R1、R2及びR3は、各々独立に水素原子又は炭素数1〜3のアルキル基を示し、R4は、単結合又は2価の有機基を示し、Xは、水素原子又は一価の陽イオンを示す。]
[式(II)中、R5は、水素原子又は炭素数1〜3のアルキル基を示し、R6は、水素原子、炭素数1〜3のアルキル基又は一価の陽イオンを示す。]
本明細書において、「物質Aを研磨する」及び「物質Aの研磨」とは、研磨により物質Aの少なくとも一部を除去することと定義される。また、pHは温度によって変化するため、「pH」は、測定対象の温度が25℃のときのpHと定義する。「〜」を用いて示された数値範囲は、「〜」の前後に記載される数値をそれぞれ最小値及び最大値として含む範囲を示す。組成物中の各成分の含有量は、組成物中に各成分に該当する物質が複数存在する場合、特に断らない限り、組成物中に存在する当該複数の物質の合計量を意味する。
本実施形態に係るスラリーは、酸化セリウム粒子(酸化セリウムを含む粒子)と、分散剤と、水とを含み、分散剤が、スルホン酸基及びスルホン酸塩基からなる群より選ばれる少なくとも1種を有する第1の単量体と、スルホン酸基及びスルホン酸塩基を有さない第2の単量体とを重合させて得られる共重合体(共重合体A)であり、共重合体Aにおける第1の単量体の共重合比率が5〜70モル%であり、酸化セリウム粒子が粒子表面に硫黄原子を有している。本実施形態に係るスラリーは、被研磨材料(例えば絶縁材料)の少なくとも一部をCMPによって除去するために用いることができる。
酸化セリウム粒子としては、特に制限はなく、公知のものを使用することができる。一般に、酸化セリウム粒子は、炭酸塩、硝酸塩、硫酸塩、シュウ酸塩等のセリウム塩を酸化することによって得ることができる。酸化セリウム粒子を作製する方法としては、例えば、セリウム塩を焼成する焼成法、及び、過酸化水素等を用いる酸化法が挙げられる。
分散剤は、スルホン酸基及びスルホン酸塩基からなる群より選ばれる少なくとも1種を有する第1の単量体と、スルホン酸基及びスルホン酸塩基を有さない第2の単量体とを重合させて得られる共重合体(共重合体A)である。共重合体Aは、第1の単量体及び第2の単量体を含む組成物を重合させて得られる共重合体である。また、共重合体Aにおける第1の単量体の共重合比率(モル比率)は5〜70モル%である。共重合体Aは、例えば、第1の単量体に由来する構造単位と、第2の単量体に由来する構造単位とを有している。また、共重合体Aは、例えば、スルホン酸基及びスルホン酸塩基からなる群より選ばれる少なくとも1種を含む構造単位を有する共重合体である。
[式(I)中、R1、R2及びR3は、各々独立に水素原子又は炭素数1〜3のアルキル基を示し、R4は、単結合又は2価の有機基を示し、Xは、水素原子又は一価の陽イオンを示す。]
[式(II)中、R5は、水素原子又は炭素数1〜3のアルキル基を示し、R6は、水素原子、炭素数1〜3のアルキル基又は一価の陽イオンを示す。]
[GPC条件]
試料:5μL
標準物質:ポリアクリル酸ナトリウム(ポリマーラボラトリー社製)
検出器:株式会社日立製作所製、「L−3300型示差屈折計」
データ処理:株式会社日立製作所製、「D−2520型GPCインテグレーター」
ポンプ:株式会社日立製作所製、商品名「L−71000」
カラム:昭和電工株式会社製 「Shodex Asahipak GS−520HQ+620HQ」
溶離液:50mM−Na2HPO4/CH3CN=90/10(v/v)
流速:0.6mL/分
酸化セリウム粒子の粒子表面に存在する硫黄原子の存在比率(%)=rS(atom%)/{rS(atom%)+rC(atom%)}×100
本実施形態に係るスラリーは、水を含んでいる。水としては、特に制限されないが、脱イオン水、イオン交換水、超純水等が好ましい。水の含有量は、特に限定されず、スラリーに含まれる水以外の成分の含有量に応じて調整することができる。なお、スラリーは、必要に応じて水以外の溶媒(例えば、エタノール、アセトン等の極性溶媒)を更に含んでもよい。
本実施形態に係るスラリーは、pH調整剤を更に含んでいてもよい。必要に応じてpH調整剤を用いることにより、スラリーのpHを所望のpHに調整することができる。pH調整剤としては、特に制限はないが、硝酸、硫酸、塩酸、リン酸、ホウ酸、酢酸等の酸成分;水酸化ナトリウム、アンモニア、水酸化カリウム、水酸化カルシウム等の塩基成分などが挙げられる。スラリーが半導体研磨に使用される場合には、アンモニア又は酸成分が好適に使用される。pH調整剤としては、水溶性高分子をアンモニアで部分的に中和することにより得られる、水溶性高分子のアンモニウム塩を使用することもできる。
本実施形態に係るスラリーは、高分子化合物として、カルボン酸基及びカルボン酸塩基からなる群より選ばれる少なくとも1種を有する水溶性有機高分子(但し、共重合体Aを除く)を更に含んでいてよい。これにより、研磨終了後の被研磨材料(例えば酸化珪素)の平坦性を向上させやすくなる。より詳細には、ディッシング(凹凸を有する被研磨面を研磨した場合に、被研磨面の一部が過剰に研磨されて皿のように凹む現象)が生じることを抑制しやすくなる。
本実施形態に係るスラリーは、有機酸、有機酸塩及び有機酸誘導体からなる群より選ばれる少なくとも1種の有機酸化合物を含んでいてよい。これにより、研磨速度を向上させやすくなると共に、研磨終了後の被研磨材料(例えば酸化珪素)の平坦性を向上させやすくなる。より詳細には、ディッシングが生じることを抑制しやすくなる。
本実施形態に係るスラリーは、酸化セリウム粒子、共重合体A(分散剤)、pH調整剤、水溶性有機高分子及び有機酸化合物とは異なる化合物をその他の添加剤として含むことができる。その他の添加剤としては、水溶性高分子化合物(但し、共重合体A及び上記水溶性有機高分子を除く)、水溶性陽イオン性化合物、水溶性陰イオン性化合物、水溶性非イオン性化合物、水溶性両性化合物等が挙げられる。
本実施形態に係るスラリーの製造方法は、本実施形態に係るスラリーを製造するための方法である。本実施形態に係るスラリーの製造方法は、例えば、酸化セリウム作製工程と、分散工程とを備えている。
本実施形態に係る研磨方法は、本実施形態に係るスラリーを用いて、被研磨材料(例えば絶縁材料)の少なくとも一部をCMPによって除去する工程を備える。本実施形態に係る研磨方法は、例えば、基板の研磨方法であり、表面に絶縁材料を有する基板を研磨する工程を備えている。
市販の炭酸セリウム水和物40kgをアルミナ製容器に入れ、830℃、空気中で2時間焼成することにより黄白色の粉末を20kg得た。この粉末の相同定をX線回折法により行い、酸化セリウム粉末が得られたことを確認した。得られた酸化セリウム粉末20kgを、ジェットミルを用いて乾式粉砕し、酸化セリウム粒子を含む酸化セリウム粉末を得た。
重合体として、下記の重合体1〜10を準備した。
2−アクリルアミド−2−メチルプロパンスルホン酸とアクリル酸との共重合体(2−アクリルアミド−2−メチルプロパンスルホン酸の共重合比率(RS):6モル%、重量平均分子量(Mw):17400)
(重合体2)
2−アクリルアミド−2−メチルプロパンスルホン酸とアクリル酸との共重合体(2−アクリルアミド−2−メチルプロパンスルホン酸の共重合比率(RS):13モル%、重量平均分子量(Mw):11500)
(重合体3)
2−アクリルアミド−2−メチルプロパンスルホン酸とアクリル酸との共重合体(2−アクリルアミド−2−メチルプロパンスルホン酸の共重合比率(RS):25モル%、重量平均分子量(Mw):10800)
(重合体4)
2−アクリルアミド−2−メチルプロパンスルホン酸とアクリル酸との共重合体(2−アクリルアミド−2−メチルプロパンスルホン酸の共重合比率(RS):50モル%、重量平均分子量(Mw):8400)
(重合体5)
2−アクリルアミド−2−メチルプロパンスルホン酸とアクリル酸との共重合体(2−アクリルアミド−2−メチルプロパンスルホン酸の共重合比率(RS):25モル%、重量平均分子量(Mw):7700)
(重合体6)
2−アクリルアミド−2−メチルプロパンスルホン酸とアクリル酸との共重合体(2−アクリルアミド−2−メチルプロパンスルホン酸の共重合比率(RS):25モル%、重量平均分子量(Mw):24700)
(重合体7)
2−アクリルアミド−2−メチルプロパンスルホン酸とアクリル酸との共重合体(2−アクリルアミド−2−メチルプロパンスルホン酸の共重合比率(RS):25モル%、重量平均分子量(Mw):32700)
(重合体8)
ポリアクリル酸(重量平均分子量(Mw):13900)
(重合体9)
アクリル酸アンモニウムとアクリル酸メチルとの共重合体(アクリル酸アンモニウムの共重合比率(RA):75モル%、重量平均分子量(Mw):10000)
(重合体10)
2−アクリルアミド−2−メチルプロパンスルホン酸のホモポリマー(重量平均分子量(Mw):5800)
[GPC条件]
試料:5μL
標準物質:ポリアクリル酸ナトリウム(ポリマーラボラトリー社製)
検出器:株式会社日立製作所製、「L−3300型示差屈折計」
データ処理:株式会社日立製作所製、「D−2520型GPCインテグレーター」
ポンプ:株式会社日立製作所製、商品名「L−71000」
カラム:昭和電工株式会社製 「Shodex Asahipak GS−520HQ+620HQ」
溶離液:50mM−Na2HPO4/CH3CN=90/10(v/v)
流速:0.6mL/分
(実施例1)
上記で作製した酸化セリウム粉末200.0gと、脱イオン水795.0gとを混合した後、重合体1(分散剤)の水溶液(分散剤の含有量:40質量%)5gを添加した。そして、攪拌しながら超音波分散を行い、酸化セリウム分散液を得た。超音波分散は、超音波周波数400kHz、分散時間30分で行った。得られた酸化セリウム分散液を分級及び希釈することにより、平均粒径(D50)が180nmの酸化セリウム粒子を含む砥粒含有液(固形分含量:5質量%)を得た。平均粒径は、レーザ回折・散乱式粒度分布測定装置(日機装株式会社製、商品名:Microtrac MT3300EXII)で測定した。
[pH測定条件]
測定器:横河電機株式会社製、商品名:Model PH81
校正液:フタル酸塩pH緩衝液(pH:4.21)、中性リン酸塩pH緩衝液(pH6.86)
測定温度:25℃
測定手順:校正液を用いて2点校正した後、電極を測定対象に入れてから25℃で2分以上放置し、安定したときのpHを測定値とした。
重合体1の水溶液に代えて重合体2の水溶液(分散剤の含有量:40質量%)を用いたこと以外は、実施例1と同様にして、実施例2の酸化セリウムスラリー(pH=5.0、平均粒径(D50)=180nm)を得た。
重合体1の水溶液に代えて重合体3の水溶液(分散剤の含有量:40質量%)を用いたこと以外は、実施例1と同様にして、実施例3の酸化セリウムスラリー(pH=5.0、平均粒径(D50)=180nm)を得た。
重合体1の水溶液に代えて重合体4の水溶液(分散剤の含有量:40質量%)を用いたこと以外は、実施例1と同様にして、実施例4の酸化セリウムスラリー(pH=5.0、平均粒径(D50)=180nm)を得た。
重合体1の水溶液に代えて重合体5の水溶液(分散剤の含有量:40質量%)を用いたこと以外は、実施例1と同様にして、実施例5の酸化セリウムスラリー(pH=5.0、平均粒径(D50)=180nm)を得た。
重合体1の水溶液に代えて重合体6の水溶液(分散剤の含有量:40質量%)を用いたこと以外は、実施例1と同様にして、実施例6の酸化セリウムスラリー(pH=5.0、平均粒径(D50)=180nm)を得た。
重合体1の水溶液に代えて重合体7の水溶液(分散剤の含有量:40質量%)を用いたこと以外は、実施例1と同様にして、実施例7の酸化セリウムスラリー(pH=5.0、平均粒径(D50)=180nm)を得た。
重合体3の水溶液を10g用いたこと以外は、実施例3と同様にして、実施例8の酸化セリウムスラリー(pH:5.0、平均粒径(D50):180nm)を得た。
重合体3の水溶液を15g用いたこと以外は、実施例3と同様にして、実施例9の酸化セリウムスラリー(pH=5.0、平均粒径(D50)=180nm)を得た。
重合体1の水溶液に代えて重合体8の水溶液(重合体の含有量:40質量%)を用いたこと以外は、実施例1と同様にして、比較例1の酸化セリウムスラリー(pH=5.0、平均粒径(D50)=180nm)を得た。
重合体1の水溶液に代えて重合体9の水溶液(重合体の含有量:40質量%)を用いたこと以外は、実施例1と同様にして、比較例2の酸化セリウムスラリー(pH=5.0、平均粒径(D50)=180nm)を得た。
重合体1の水溶液に代えて重合体10の水溶液(重合体の含有量:40質量%)を用いたこと以外は、実施例1と同様にして、比較例3の酸化セリウムスラリー(pH=5.0、平均粒径(D50)=180nm)を得た。
下記の方法により、酸化セリウム粒子の表面に存在する硫黄原子の存在比率を算出した。
酸化セリウム粒子の粒子表面に存在する硫黄原子の存在比率(%)=硫黄の原子比率rS(atom%)/{硫黄の原子比率rS(atom%)+セリウムの原子比率rC(atom%)}×100
装置:アルバック・ファイ株式会社製、商品名PHI 5000 VersaProbeII
X線:単色化AlKα線(1486.6eV)
検出角度:45°
X線ビーム径:200μmΦ(50w 15kV)
パスエネルギー(Ce測定時):29.35eV
パスエネルギー(S測定時):58.70eV
帯電中和:低エネルギー電子とイオンビームを同時に照射し中和して測定した。
積算回数:硫黄=60回、セリウム=24回
酸化セリウムスラリー中の酸化セリウム粒子の粒径(D99)の保管前後における変化率に基づき、実施例及び比較例の酸化セリウムスラリーの保管安定性を評価した。粒径(D99)の変化率は下記式に基づき算出した。評価時間を短縮するため、酸化セリウムスラリーを保管温度60℃、保管期間5日間で保管して加速評価を行った。なお、粒径(D99)は、累積体積比率が99%になる粒径を意味し、レーザ回折・散乱式粒度分布測定装置である、日機装株式会社製、商品名:Microtrac MT3300EXIIを用いて測定した。
粒径変化率(%)={保管後粒径(nm)−保管前粒径(nm)}/保管前粒径(nm)×100
A:粒径変化率が0%以上5%未満
B:粒径変化率が5%以上10%未満
C:粒径変化率が10%以上20%未満
D:粒径変化率が20%以上
実施例及び比較例の酸化セリウムスラリーを用いて、研磨速度及び平坦性の評価を行った。なお、実施例及び比較例の酸化セリウムスラリー(酸化セリウム粒子の含有量:2.0質量%)は、濃縮倍率が6倍の研磨液であるため、研磨特性の評価では、上記酸化セリウムスラリーの質量の5倍に相当する脱イオン水で上記酸化セリウムスラリーを6倍に希釈して得られたスラリーを用いて評価を行った。
ブランケットウエハとして下記基板(a)及び基板(b)を用いて研磨速度の評価を行った。基板(a)及び基板(b)を下記研磨条件で研磨した。続いて、各基板を純水でよく洗浄した後、乾燥した。そして、膜厚測定装置(大日本スクリーン製造社製、商品名:ラムダエース VL−M8000LS)を用いて基板(a)及び基板(b)における研磨前後での膜厚差を測定した後、膜厚差の結果に基づき研磨速度を求めた。
基板(a):CVD法でシリコンウエハ上に形成された酸化珪素膜(厚さ:1000nm)を有する直径200mmの基板。
基板(b):CVD法でシリコンウエハ上に形成された窒化珪素膜(厚さ:200nm)を有する直径200mmの基板。
研磨装置:Applied Materials社製、商品名:Mirra
研磨パッド:Rohm and Haas社製、型番IC1010
加工荷重:214gf/cm2(21.0kPa)
スラリー供給速度:150mL/分
定盤回転数:90回転/分
基板回転数:90回転/分
研磨時間:60秒
研磨試験ウエハとして、SEMATECH社製のパタンウエハ(商品名:864ウエハ、直径:200mm)を用いた。この研磨試験ウエハ、及び、これを用いた研磨特性の評価方法を、図1を用いて説明する。
Claims (11)
- 酸化セリウム粒子と、分散剤と、水とを含み、
前記分散剤が、スルホン酸基及びスルホン酸塩基からなる群より選ばれる少なくとも1種を有する第1の単量体と、スルホン酸基及びスルホン酸塩基を有さない第2の単量体とを重合させて得られる共重合体であり、
前記共重合体における前記第1の単量体の共重合比率が5〜70モル%であり、
前記酸化セリウム粒子が粒子表面に硫黄原子を有し、
前記第1の単量体が、2−アクリルアミド−2−メチルプロパンスルホン酸を含み、
前記第2の単量体が、アクリル酸及びメタクリル酸からなる群より選ばれる少なくとも1種を含み、
前記酸化セリウム粒子の平均粒径が50nm以上である、スラリー。 - 前記共重合体の含有量が、前記酸化セリウム粒子100質量部に対して0.001〜6質量部である、請求項1に記載のスラリー。
- 前記共重合体の重量平均分子量が1000〜100000である、請求項1又は2に記載のスラリー。
- カルボン酸基及びカルボン酸塩基からなる群より選ばれる少なくとも1種を有する水溶性有機高分子(ただし、前記共重合体を除く)を更に含む、請求項1〜3のいずれか一項に記載のスラリー。
- 前記水溶性有機高分子の含有量が、スラリー全質量基準で0.01〜1.0質量%である、請求項4に記載のスラリー。
- 有機酸、有機酸塩及び有機酸誘導体からなる群より選ばれる少なくとも1種の有機酸化合物を更に含む、請求項1〜5のいずれか一項に記載のスラリー。
- 前記有機酸化合物の含有量が、スラリー全質量基準で、0.001〜1質量%である,請求項6に記載のスラリー。
- 前記第2の単量体がアクリル酸を含む、請求項5に記載のスラリー。
- pHが3.0〜6.0である、請求項1〜8のいずれか一項に記載のスラリー。
- 請求項1〜9のいずれか一項に記載のスラリーの製造方法であって、
前記酸化セリウム粒子と、前記分散剤と、水とを混合する工程を備える、スラリーの製造方法。 - 請求項1〜9のいずれか一項に記載のスラリーを用いて、絶縁材料の少なくとも一部をCMPによって除去する工程を備える、研磨方法。
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