JP2018157164A - 研磨用組成物、研磨用組成物の製造方法、研磨方法および半導体基板の製造方法 - Google Patents
研磨用組成物、研磨用組成物の製造方法、研磨方法および半導体基板の製造方法 Download PDFInfo
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- JP2018157164A JP2018157164A JP2017054946A JP2017054946A JP2018157164A JP 2018157164 A JP2018157164 A JP 2018157164A JP 2017054946 A JP2017054946 A JP 2017054946A JP 2017054946 A JP2017054946 A JP 2017054946A JP 2018157164 A JP2018157164 A JP 2018157164A
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- SMWDFEZZVXVKRB-UHFFFAOYSA-N anhydrous quinoline Natural products N1=CC=CC2=CC=CC=C21 SMWDFEZZVXVKRB-UHFFFAOYSA-N 0.000 description 1
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- RKJUIXBNRJVNHR-UHFFFAOYSA-N indolenine Natural products C1=CC=C2CC=NC2=C1 RKJUIXBNRJVNHR-UHFFFAOYSA-N 0.000 description 1
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- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 description 1
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- AWJUIBRHMBBTKR-UHFFFAOYSA-N iso-quinoline Natural products C1=NC=CC2=CC=CC=C21 AWJUIBRHMBBTKR-UHFFFAOYSA-N 0.000 description 1
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- 150000002736 metal compounds Chemical class 0.000 description 1
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- 150000004706 metal oxides Chemical class 0.000 description 1
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- QMPFMODFBNEYJH-UHFFFAOYSA-N methyl 1h-1,2,4-triazole-5-carboxylate Chemical compound COC(=O)C1=NC=NN1 QMPFMODFBNEYJH-UHFFFAOYSA-N 0.000 description 1
- BEGLCMHJXHIJLR-UHFFFAOYSA-N methylisothiazolinone Chemical compound CN1SC=CC1=O BEGLCMHJXHIJLR-UHFFFAOYSA-N 0.000 description 1
- 239000012046 mixed solvent Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 229910021421 monocrystalline silicon Inorganic materials 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- MGFYIUFZLHCRTH-UHFFFAOYSA-N nitrilotriacetic acid Chemical compound OC(=O)CN(CC(O)=O)CC(O)=O MGFYIUFZLHCRTH-UHFFFAOYSA-N 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 239000012788 optical film Substances 0.000 description 1
- 235000005985 organic acids Nutrition 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 229910052762 osmium Inorganic materials 0.000 description 1
- SYQBFIAQOQZEGI-UHFFFAOYSA-N osmium atom Chemical compound [Os] SYQBFIAQOQZEGI-UHFFFAOYSA-N 0.000 description 1
- 235000006408 oxalic acid Nutrition 0.000 description 1
- 150000002916 oxazoles Chemical class 0.000 description 1
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- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000006174 pH buffer Substances 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- HJKYXKSLRZKNSI-UHFFFAOYSA-I pentapotassium;hydrogen sulfate;oxido sulfate;sulfuric acid Chemical compound [K+].[K+].[K+].[K+].[K+].OS([O-])(=O)=O.[O-]S([O-])(=O)=O.OS(=O)(=O)O[O-].OS(=O)(=O)O[O-] HJKYXKSLRZKNSI-UHFFFAOYSA-I 0.000 description 1
- LQPLDXQVILYOOL-UHFFFAOYSA-I pentasodium;2-[bis[2-[bis(carboxylatomethyl)amino]ethyl]amino]acetate Chemical compound [Na+].[Na+].[Na+].[Na+].[Na+].[O-]C(=O)CN(CC([O-])=O)CCN(CC(=O)[O-])CCN(CC([O-])=O)CC([O-])=O LQPLDXQVILYOOL-UHFFFAOYSA-I 0.000 description 1
- 229960003330 pentetic acid Drugs 0.000 description 1
- VLTRZXGMWDSKGL-UHFFFAOYSA-N perchloric acid Chemical compound OCl(=O)(=O)=O VLTRZXGMWDSKGL-UHFFFAOYSA-N 0.000 description 1
- KHIWWQKSHDUIBK-UHFFFAOYSA-N periodic acid Chemical compound OI(=O)(=O)=O KHIWWQKSHDUIBK-UHFFFAOYSA-N 0.000 description 1
- 229960005323 phenoxyethanol Drugs 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 125000002467 phosphate group Chemical group [H]OP(=O)(O[H])O[*] 0.000 description 1
- ACVYVLVWPXVTIT-UHFFFAOYSA-N phosphinic acid Chemical compound O[PH2]=O ACVYVLVWPXVTIT-UHFFFAOYSA-N 0.000 description 1
- XNGIFLGASWRNHJ-UHFFFAOYSA-L phthalate(2-) Chemical compound [O-]C(=O)C1=CC=CC=C1C([O-])=O XNGIFLGASWRNHJ-UHFFFAOYSA-L 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920000137 polyphosphoric acid 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
- 239000011496 polyurethane foam Substances 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 229960003975 potassium Drugs 0.000 description 1
- 235000011056 potassium acetate Nutrition 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
- 239000011736 potassium bicarbonate Substances 0.000 description 1
- 235000015497 potassium bicarbonate Nutrition 0.000 description 1
- 229910000028 potassium bicarbonate Inorganic materials 0.000 description 1
- 239000001103 potassium chloride Substances 0.000 description 1
- 235000011164 potassium chloride Nutrition 0.000 description 1
- TYJJADVDDVDEDZ-UHFFFAOYSA-M potassium hydrogencarbonate Chemical compound [K+].OC([O-])=O TYJJADVDDVDEDZ-UHFFFAOYSA-M 0.000 description 1
- 229940086066 potassium hydrogencarbonate Drugs 0.000 description 1
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 description 1
- OTYBMLCTZGSZBG-UHFFFAOYSA-L potassium sulfate Chemical compound [K+].[K+].[O-]S([O-])(=O)=O OTYBMLCTZGSZBG-UHFFFAOYSA-L 0.000 description 1
- 229910052939 potassium sulfate Inorganic materials 0.000 description 1
- 235000011151 potassium sulphates Nutrition 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- ROSDSFDQCJNGOL-UHFFFAOYSA-N protonated dimethyl amine Natural products CNC ROSDSFDQCJNGOL-UHFFFAOYSA-N 0.000 description 1
- 150000003216 pyrazines Chemical class 0.000 description 1
- 150000004892 pyridazines Chemical class 0.000 description 1
- 150000003233 pyrroles Chemical class 0.000 description 1
- 229910052703 rhodium Inorganic materials 0.000 description 1
- 239000010948 rhodium Substances 0.000 description 1
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 1
- 229910052707 ruthenium Inorganic materials 0.000 description 1
- 238000000790 scattering method Methods 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 1
- 235000017557 sodium bicarbonate Nutrition 0.000 description 1
- 235000002639 sodium chloride Nutrition 0.000 description 1
- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Substances [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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- 239000011550 stock solution Substances 0.000 description 1
- 125000000542 sulfonic acid group Chemical group 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 1
- ISIJQEHRDSCQIU-UHFFFAOYSA-N tert-butyl 2,7-diazaspiro[4.5]decane-7-carboxylate Chemical compound C1N(C(=O)OC(C)(C)C)CCCC11CNCC1 ISIJQEHRDSCQIU-UHFFFAOYSA-N 0.000 description 1
- 150000003557 thiazoles Chemical class 0.000 description 1
- UAXOELSVPTZZQG-UHFFFAOYSA-N tiglic acid Natural products CC(C)=C(C)C(O)=O UAXOELSVPTZZQG-UHFFFAOYSA-N 0.000 description 1
- LDHQCZJRKDOVOX-UHFFFAOYSA-N trans-crotonic acid Natural products CC=CC(O)=O LDHQCZJRKDOVOX-UHFFFAOYSA-N 0.000 description 1
- 229910001428 transition metal ion Inorganic materials 0.000 description 1
- YWYZEGXAUVWDED-UHFFFAOYSA-N triammonium citrate Chemical compound [NH4+].[NH4+].[NH4+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O YWYZEGXAUVWDED-UHFFFAOYSA-N 0.000 description 1
- 239000001393 triammonium citrate Substances 0.000 description 1
- 235000011046 triammonium citrate Nutrition 0.000 description 1
- USIPWJRLUGPSJM-UHFFFAOYSA-K trisodium 2-(2-aminoethylamino)ethanol triacetate Chemical compound [Na+].[Na+].[Na+].CC([O-])=O.CC([O-])=O.CC([O-])=O.NCCNCCO USIPWJRLUGPSJM-UHFFFAOYSA-K 0.000 description 1
- 229910021642 ultra pure water Inorganic materials 0.000 description 1
- 239000012498 ultrapure water Substances 0.000 description 1
- 229940005605 valeric acid Drugs 0.000 description 1
- 229920003169 water-soluble polymer Polymers 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
Landscapes
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
- Mechanical Treatment Of Semiconductor (AREA)
Abstract
Description
本発明の研磨用組成物は、特に制限されないが、金属を含む層を有する研磨対象物の研磨に好適に用いられる。当該金属としては、例えば、タングステン、銅、アルミニウム、ハフニウム、コバルト、ニッケル、チタン、タンタル、金、銀、白金、パラジウム、ロジウム、ルテニウム、イリジウム、オスミウム等が挙げられる。これらの金属は、合金または金属化合物の形態で含まれていてもよい。これら金属のうち、コバルト、銅、タングステン、アルミニウムが好ましく、コバルトがより好ましい。
本発明の研磨用組成物は、砥粒を含む。研磨用組成物中に含まれる砥粒は、研磨対象物を機械的に研磨する作用を有する。
本発明に係る研磨用組成物は、各成分を分散または溶解するために分散媒を含む。分散媒の好ましい例としては水が挙げられる。水は、洗浄対象物の汚染や他の成分の作用を阻害するという観点から、不純物をできる限り含有しないことが好ましい。このような水としては、例えば、遷移金属イオンの合計含有量が100ppb以下である水が好ましい。ここで、水の純度は、例えば、イオン交換樹脂を用いる不純物イオンの除去、フィルタによる異物の除去、蒸留等の操作によって高めることができる。具体的には、水としては、例えば、脱イオン水(イオン交換水)、純水、超純水、蒸留水などを用いることが好ましい。
本発明に係る研磨用組成物は、防食剤を含む。防食剤は、金属の溶解や腐食を防ぐことで、金属の研磨速度を抑制し、研磨対象物の段差形状を向上させる作用を有する。本発明において、使用可能な防食剤は、特に制限されないが、好ましくは複素環式化合物または界面活性剤である。複素環式化合物中の複素環の員数は特に限定されない。また、複素環式化合物は、単環化合物であってもよいし、縮合環を有する多環化合物であってもよい。該金属防食剤は、単独でもまたは2種以上混合して用いてもよい。また、該金属防食剤は、市販品を用いてもよいし合成品を用いてもよい。
本発明に係る研磨用組成物は、第1の酸解離定数(pKa1)が2以上である酸またはその塩を含む。前記酸またはその塩は、電気伝導度を調整するために使用されるが、第1の酸解離定数(pKa1)が2以上である酸またはその塩(いわゆる弱酸またはその塩)を使用することで、コバルト等の金属の酸による腐食を抑制できると考えられる。なお、本明細書において、「第1の酸解離定数(pKa1)」を単に「第1の酸解離定数」または「pKa1」とも称する。「第1の酸解離定数(pKa1)が2以上である酸またはその塩」を単に「酸またはその塩」とも称する。
本発明に係る研磨用組成物の電気伝導度は、3mS/cm以上である。電気伝導度が高いと砥粒同士の間の静電反発力が小さくなり、かつ静電反発力の及ぶ範囲が狭くなるため、砥粒同士が近接し二次粒子径が大きくなり、機械的研磨力が上がると考えられる。よって、二酸化ケイ素の研磨速度を高めることができる。電気伝導度が3mS/cm未満である場合、二酸化ケイ素の研磨速度が低い。該電気伝導度は、好ましくは4mS/cm以上、より好ましくは5mS/cm以上である。一方、電気伝導度の上限値は特に制限されないが、好ましくは20mS/cm以下である。
本発明に係る研磨用組成物は、本発明の効果が著しく妨げられない範囲で、酸化剤、錯化剤、pH調整剤、防腐剤、防カビ剤等の、研磨用組成物に用いられ得る公知の添加剤を、必要に応じてさらに含有してもよい。
本発明に係る研磨用組成物のpHは、6.5以上である。pHが6.5未満の場合、金属の溶解が抑制できなくなり、金属のエッチングレートが高くなる。該pHは、好ましくは6.6以上、より好ましくは6.9以上である。研磨用組成物のpHが高くなると金属の溶解が抑えられる傾向にある。一方、砥粒の溶解を防ぎ、該砥粒による機械的な研磨作用の低下を抑制する観点から、研磨用組成物のpHは、12.0以下であることが好ましく、11.8以下であることがより好ましく、11.5以下であることがさらに好ましく、11.0以下であることが特に好ましい。
上述したように、本発明に係る研磨用組成物は、金属を含む層を有する研磨対象物の研磨に好適に用いられる。前記金属は、コバルトであることが好ましい。本発明に係る研磨用組成物は、典型的には該研磨用組成物を含む研磨液の形態で研磨対象物に供給されて、その研磨対象物の研磨に用いられる。本発明に係る研磨用組成物は、例えば、希釈(典型的には、水により希釈)して研磨液として使用されるものであってもよく、そのまま研磨液として使用されるものであってもよい。すなわち、本発明に係る技術における研磨用組成物の概念には、研磨対象物に供給されて該研磨対象物の研磨に用いられる研磨用組成物(ワーキングスラリー)と、希釈して研磨に用いられる濃縮液(ワーキングスラリーの原液)との双方が包含される。上記濃縮液の濃縮倍率は、例えば、体積基準で2倍〜100倍程度とすることができ、通常は5倍〜50倍程度が適当である。ただし、上記研磨用組成物における各成分の含有量は、そのまま研磨液として使用される場合の含有量を指す。
本発明においては、前記研磨用組成物を製造する、製造方法を提供する。本発明に係る研磨用組成物の製造方法は特に限定されない。例えば、砥粒、水溶性高分子、塩基性化合物および必要に応じて他の添加剤を、水中で攪拌混合することにより得ることができる。本発明の一実施形態による研磨用組成物の製造方法は、砥粒、酸またはその塩、防食剤、分散媒を混合することを含む、研磨用組成物の製造方法である。また、酸化剤の保存安定性の観点から、砥粒と、塩基性化合物とを水中で混合し、混合物を得る工程、および研磨する直前に前記混合物に酸化剤を添加し混合する工程を含む製造方法がより好ましい。
上述のように、本発明の研磨用組成物は、金属を含む層を有する研磨対象物の研磨に好適に用いられる。よって、本発明は、研磨用組成物を用いて、金属を含む層を有する研磨対象物を研磨することを含む研磨方法をも提供する。本発明の研磨用組成物は、特にコバルトを含む層を有する研磨対象物を研磨する工程に使用されることが好ましい。すなわち、本発明は、研磨用組成物を用いて、コバルトを含む層を有する研磨対象物を研磨することを含む研磨方法をも提供する。
<半導体基板の製造方法>
本発明の研磨用組成物は、金属を含む層(研磨対象物)の研磨に好適に用いられる。よって、本発明は、金属を含む層を有する研磨対象物を本発明の研磨用組成物で研磨する研磨方法をも提供する。また、本発明は、金属を含む層(研磨対象物)を前記研磨方法で研磨する工程を含む基板の製造方法を提供する。
(研磨用組成物A1〜A15、研磨用組成物C1〜C9の調製)
溶媒としての水に、表1に示す砥粒、酸(またはその塩)および防食剤を表1に示す含有量となるように添加し、48%水酸化カリウムを用いてpH8に調製した。その後、表1に示す種類及び含有量の酸化剤を加えて、攪拌混合し各研磨用組成物を調製した(混合温度約25℃、混合時間:約10分)。
研磨用組成物調整後の電気伝導度は、卓上型電気伝導度計(株式会社堀場製作所製 型番:DS−71)により測定した。
各研磨用組成物を使用して、研磨対象物(試験片)の表面を下記の条件で研磨した。実施例1〜15および比較例1〜9において、試験片としては、表面に厚さ2000Åのコバルト膜または10000ÅのTEOS膜(二酸化ケイ素膜)を形成したシリコンウェーハ(200mm、ブランケットウェーハ)、を使用した。実施例16において、試験片としては、表面に厚さ10000Åの銅膜または10000ÅのTEOS膜(二酸化ケイ素膜)を形成したシリコンウェーハ(200mm、ブランケットウェーハ)を使用した。
研磨装置:200mmウェーハ用 片面CMP研磨機(Applied Materials社製 Mirra)
研磨圧力:2psi
パッド:硬質ポリウレタンパッドIC1010パッド(ダウケミカル社製)
研磨定盤の回転速度:93rpm
キャリアの回転速度:87rpm
研磨用組成物の供給:掛け流し
研磨用組成物の供給量:200mL/min
研磨時間:60秒
<コバルトまたは銅のエッチングレート>
コバルトブランケットウェーハまたは銅ブランケットウェーハを30×30mmのチップに切断したクーポンを40℃の条件で10分間、研磨用組成物に浸漬させ、浸漬前後の膜厚を求めた。浸漬前後の膜厚は、シート抵抗測定器(国際電気システムサービス株式会社製 型番:VR−120)を用いて測定し、浸漬前後の膜厚の差をコバルトまたは銅のエッチングレートとした。具体的にはこの値が低いほどコバルトまたは銅の研磨の際に発生すると想定される溶解が抑えられていることになるため、好ましい結果であると言える。結果を表2に記入した。
表1に示す各研磨用組成物200mLを準備し、電気化学測定(クロノアンペロメトリー)用のサンプルとした。研磨用組成物に参照電極、作用電極および対極を浸漬し、以下に示す条件にて、作用電極としてのコバルトまたは銅に一定の電圧をかけたときに流れる電流の最大値を測定した。
参照電極:銀−塩化銀電極
作用電極:コバルトまたは銅
対極:白金
印加電圧:1V
電圧印加時間:30秒
試験温度:25℃
スターラー回転速度:300rpm
具体的には、1V印加後の電流が小さいほど、コバルトまたは銅の腐食が抑えられる。結果を表2に記入した。
△:10−3A/cm2以上、10−2A/cm2未満
×:10−2A/cm2以上。
表1に示す研磨用組成物を80℃、1週間保管し、保管前後の砥粒の平均二次粒子径を測定した。平均二次粒子径は、動的光散乱式粒子径・粒度分布装置(日機装株式会社製 型番:(UPA−UT151)により、体積平均粒子径(体積基準の算術平均径;Mv)として測定した。具体的には保管前後の平均二次粒子径の変化量が小さいほど、保存安定性に優れた研磨用組成物であるということであり、良好な結果であると言える。結果を表2に記入した。
△:10nm以上12nm未満
×:12nm以上
Claims (13)
- 砥粒と、
第1の酸解離定数(pKa1)が、2以上である酸またはその塩と、
防食剤と、
分散媒と、を含み、
電気伝導度が3mS/cm以上であり、かつpHが6.5以上である、研磨用組成物。 - 前記酸またはその塩は、カルボキシル基またはその塩の基、リン酸基またはその塩の基、および炭酸基またはその塩の基からなる群より選択される少なくとも1つの官能基を有する化合物である、請求項1に記載の研磨用組成物。
- 前記酸またはその塩は、カルボキシル基またはその塩の基を有する化合物である、請求項1または2に記載の研磨用組成物。
- 前記カルボキシル基またはその塩の基を有する化合物は、コハク酸、酢酸、クエン酸およびこれらの塩からなる群より選択される少なくとも1種である、請求項2または3に記載の研磨用組成物。
- 前記防食剤は、アゾール化合物またはアニオン性界面活性剤である、請求項1〜4のいずれか1項に記載の研磨用組成物。
- 前記アゾール化合物は、トリアゾール化合物またはテトラゾール化合物である、請求項5に記載の研磨用組成物。
- 前記砥粒は、表面にアニオン性官能基を有するコロイダルシリカである、請求項1〜6のいずれか1項に記載の研磨用組成物。
- 金属を含む層を有する研磨対象物の研磨に用いられる、請求項1〜7のいずれか1項に記載の研磨用組成物。
- 前記金属がコバルトである、請求項8に記載の研磨用組成物。
- 前記砥粒、前記酸またはその塩、前記防食剤、および前記分散媒を混合する工程を含む、請求項1〜9のいずれか1項に記載の研磨用組成物の製造方法。
- 請求項1〜10のいずれか1項に記載の研磨用組成物を用いて、金属を含む層を有する研磨対象物を研磨する工程を含む、研磨方法。
- 前記金属がコバルトである、請求項11に記載の研磨方法。
- 表面に金属を含む層を有する半導体基板を請求項11に記載の研磨方法により研磨する工程を含む半導体基板の製造方法。
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