JP7487507B2 - 研磨剤及び研磨方法 - Google Patents
研磨剤及び研磨方法 Download PDFInfo
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- JP7487507B2 JP7487507B2 JP2020050738A JP2020050738A JP7487507B2 JP 7487507 B2 JP7487507 B2 JP 7487507B2 JP 2020050738 A JP2020050738 A JP 2020050738A JP 2020050738 A JP2020050738 A JP 2020050738A JP 7487507 B2 JP7487507 B2 JP 7487507B2
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- Prior art keywords
- polishing
- mass
- abrasive
- acid
- oxide film
- Prior art date
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- 238000000034 method Methods 0.000 title claims description 40
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- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 claims description 47
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- SBRXLTRZCJVAPH-UHFFFAOYSA-N ethyl(trimethoxy)silane Chemical compound CC[Si](OC)(OC)OC SBRXLTRZCJVAPH-UHFFFAOYSA-N 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- RIKMMFOAQPJVMX-UHFFFAOYSA-N fomepizole Chemical compound CC=1C=NNC=1 RIKMMFOAQPJVMX-UHFFFAOYSA-N 0.000 description 1
- 229960004285 fomepizole Drugs 0.000 description 1
- 235000019253 formic acid Nutrition 0.000 description 1
- 229910021485 fumed silica Inorganic materials 0.000 description 1
- AWJWCTOOIBYHON-UHFFFAOYSA-N furo[3,4-b]pyrazine-5,7-dione Chemical compound C1=CN=C2C(=O)OC(=O)C2=N1 AWJWCTOOIBYHON-UHFFFAOYSA-N 0.000 description 1
- 235000013922 glutamic acid Nutrition 0.000 description 1
- 239000004220 glutamic acid Substances 0.000 description 1
- ZDXPYRJPNDTMRX-UHFFFAOYSA-N glutamine Natural products OC(=O)C(N)CCC(N)=O ZDXPYRJPNDTMRX-UHFFFAOYSA-N 0.000 description 1
- 235000004554 glutamine Nutrition 0.000 description 1
- 125000005843 halogen group Chemical group 0.000 description 1
- QOSATHPSBFQAML-UHFFFAOYSA-N hydrogen peroxide;hydrate Chemical compound O.OO QOSATHPSBFQAML-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- QWPPOHNGKGFGJK-UHFFFAOYSA-N hypochlorous acid Chemical compound ClO QWPPOHNGKGFGJK-UHFFFAOYSA-N 0.000 description 1
- 125000002883 imidazolyl group Chemical group 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
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- 229940070023 iproniazide Drugs 0.000 description 1
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- 125000000842 isoxazolyl group Chemical group 0.000 description 1
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- 239000004310 lactic acid Substances 0.000 description 1
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- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 229930182817 methionine Natural products 0.000 description 1
- POPACFLNWGUDSR-UHFFFAOYSA-N methoxy(trimethyl)silane Chemical compound CO[Si](C)(C)C POPACFLNWGUDSR-UHFFFAOYSA-N 0.000 description 1
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- JCGNDDUYTRNOFT-UHFFFAOYSA-N oxolane-2,4-dione Chemical compound O=C1COC(=O)C1 JCGNDDUYTRNOFT-UHFFFAOYSA-N 0.000 description 1
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- JSPCTNUQYWIIOT-UHFFFAOYSA-N piperidine-1-carboxamide Chemical compound NC(=O)N1CCCCC1 JSPCTNUQYWIIOT-UHFFFAOYSA-N 0.000 description 1
- XIPFMBOWZXULIA-UHFFFAOYSA-N pivalamide Chemical compound CC(C)(C)C(N)=O XIPFMBOWZXULIA-UHFFFAOYSA-N 0.000 description 1
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- 229920000259 polyoxyethylene lauryl ether Polymers 0.000 description 1
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- 239000011496 polyurethane foam Substances 0.000 description 1
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- 238000004321 preservation Methods 0.000 description 1
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- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- APCDASFMETWCPU-UHFFFAOYSA-N propane-1,2,3-tricarboxamide Chemical compound NC(=O)CC(C(N)=O)CC(N)=O APCDASFMETWCPU-UHFFFAOYSA-N 0.000 description 1
- QLNJFJADRCOGBJ-UHFFFAOYSA-N propionamide Chemical compound CCC(N)=O QLNJFJADRCOGBJ-UHFFFAOYSA-N 0.000 description 1
- 235000019260 propionic acid Nutrition 0.000 description 1
- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 description 1
- LLHKCFNBLRBOGN-UHFFFAOYSA-N propylene glycol methyl ether acetate Chemical compound COCC(C)OC(C)=O LLHKCFNBLRBOGN-UHFFFAOYSA-N 0.000 description 1
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- ROSDSFDQCJNGOL-UHFFFAOYSA-N protonated dimethyl amine Natural products CNC ROSDSFDQCJNGOL-UHFFFAOYSA-N 0.000 description 1
- NIPZZXUFJPQHNH-UHFFFAOYSA-N pyrazine-2-carboxylic acid Chemical compound OC(=O)C1=CN=CC=N1 NIPZZXUFJPQHNH-UHFFFAOYSA-N 0.000 description 1
- 125000003226 pyrazolyl group Chemical group 0.000 description 1
- PBMFSQRYOILNGV-UHFFFAOYSA-N pyridazine Chemical group C1=CC=NN=C1 PBMFSQRYOILNGV-UHFFFAOYSA-N 0.000 description 1
- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 description 1
- CJVCXRMYJNMDTP-UHFFFAOYSA-N pyridine-2,3-dicarboxamide Chemical compound NC(=O)C1=CC=CN=C1C(N)=O CJVCXRMYJNMDTP-UHFFFAOYSA-N 0.000 description 1
- 235000008151 pyridoxamine Nutrition 0.000 description 1
- 239000011699 pyridoxamine Substances 0.000 description 1
- LJXQPZWIHJMPQQ-UHFFFAOYSA-N pyrimidin-2-amine Chemical compound NC1=NC=CC=N1 LJXQPZWIHJMPQQ-UHFFFAOYSA-N 0.000 description 1
- MQEFDQWUCTUJCP-UHFFFAOYSA-N pyrimidine-2,4,5,6-tetramine;sulfuric acid Chemical compound OS(O)(=O)=O.NC1=NC(N)=C(N)C(N)=N1 MQEFDQWUCTUJCP-UHFFFAOYSA-N 0.000 description 1
- YAAWASYJIRZXSZ-UHFFFAOYSA-N pyrimidine-2,4-diamine Chemical compound NC1=CC=NC(N)=N1 YAAWASYJIRZXSZ-UHFFFAOYSA-N 0.000 description 1
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- MCJGNVYPOGVAJF-UHFFFAOYSA-N quinolin-8-ol Chemical compound C1=CN=C2C(O)=CC=CC2=C1 MCJGNVYPOGVAJF-UHFFFAOYSA-N 0.000 description 1
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Landscapes
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
- Mechanical Treatment Of Semiconductor (AREA)
Description
本明細書において「工程」との語には、独立した工程だけでなく、他の工程と明確に区別できないもののその工程の所期の作用が達成される工程が含まれる。「膜」との語は、平面図として観察したときに、全面に形成されている形状の構造に加え、一部に形成されている形状の構造も包含される。
本実施形態に係る研磨剤は、研磨時に被研磨面に触れる組成物であり、例えばCMP用研磨剤である。本実施形態に係る研磨剤は、砥粒と、アミン化合物と、水と、を含有し、砥粒がシリカ粒子を含み、研磨剤中における砥粒のゼータ電位が正である。
本実施形態に係る研磨剤は、シリカ粒子を含む砥粒を含有する。シリカ粒子は、シリカを含む粒子である。シリカ粒子におけるシリカの含有量は、シリカ粒子の全量を基準として、50質量%以上、70質量%以上、90質量%以上、95質量%以上、又は、98質量%以上であってよい。シリカ粒子は、シリカからなる粒子(実質的に粒子の100質量%がシリカである粒子)であってもよい。
本実施形態に係る研磨剤は、砥粒及び水以外の成分として添加剤を含有することができる。添加剤は、研磨剤中の砥粒の分散性の向上、研磨剤の化学的安定性の向上、研磨速度の向上等の目的で用いることができる。
本実施形態に係る研磨剤は、SiH4酸化膜及びTEOS酸化膜の高い研磨速度が得られる観点から、アミン化合物を含有する。アミン化合物は、アンモニアの少なくとも一つの水素原子を置換基で置換した構造を有する化合物の総称であり、アミド化合物(アミド基を有する化合物、酸アミド化合物)も包含する。「アンモニアの少なくとも一つの水素原子を置換基で置換した構造」は、単結合を介して窒素原子が3つの原子に結合した構造であり、複素芳香環中の窒素原子が与える構造は該当しない。但し、アミン化合物は、「アンモニアの少なくとも一つの水素原子を置換基で置換した構造」に加えて複素芳香環を有してよい。アミン化合物は、第一級アミノ基、第二級アミノ基及び第三級アミノ基からなる群より選ばれる少なくとも一種を有してよい。
本実施形態に係る研磨剤は、金属防食剤(アミン化合物を除く。以下、場合により「防食剤」という)を含有してよい。防食剤は、金属材料(例えば、銅系金属、コバルト系金属等の配線金属)に対して保護膜を形成することで金属材料のエッチングを抑制して被研磨面の荒れを低減しやすくすることができる。
本実施形態に係る研磨剤は、酸化剤(酸化剤成分、金属酸化剤。アミン化合物を除く)を含有してよい。研磨剤が酸化剤を含有することにより、金属材料(配線金属、バリア金属等。例えば金属層)の研磨速度を向上させることができる。
本実施形態に係る研磨剤は、金属材料(配線金属、バリア金属等)の高い研磨速度が得られやすい観点から、キレート剤(アミン化合物を除く)を含有してよい。キレート剤は、pH調整剤としての効果を有してもよい。キレート剤は、金属材料(配線金属、バリア金属等)の高い研磨速度が得られやすい観点から、有機酸成分(アミン化合物を除く)及び無機酸成分からなる群より選ばれる少なくとも一種の酸成分を含むことが好ましい。
本実施形態に係る研磨剤は、有機溶媒(アミン化合物を除く)を含有してもよい。研磨剤が有機溶媒を含有することにより、研磨剤の濡れ性を向上させることができる。有機溶媒としては、特に制限はないが、20℃で液状の溶媒が好ましい。100gの水(20℃)に対する有機溶媒の溶解度は、研磨剤を高濃縮化する観点から、30g以上が好ましく、50g以上がより好ましく、100g以上が更に好ましい。有機溶媒は、一種を単独で、又は、二種以上を組み合わせて使用できる。
本実施形態に係る研磨剤は、界面活性剤(界面活性剤成分。アミン化合物を除く)を含有していてもよい。研磨剤が界面活性剤を含有することにより、被研磨材料の研磨速度を容易に調整できると共に、研磨傷を容易に低減できる。
本実施形態に係る研磨剤は、水を含有する。水は、他の成分の分散媒、又は、溶媒として用いることができる。水としては、他の成分の作用を阻害することを防止するために、不純物を可能な限り含有しないものが好ましい。具体的には、水としては、イオン交換樹脂にて不純物イオンを除去した後にフィルタを通して異物を除去した水として、純水、超純水及び蒸留水からなる群より選ばれる少なくとも一種が好ましい。
本実施形態に係る研磨剤のpHは、SiH4酸化膜及びTEOS酸化膜の高い研磨速度が得られやすい観点、及び、砥粒の凝集が抑制されやすく、砥粒の良好な分散安定性が得られやすい観点から、4.0以下が好ましく、4.0未満がより好ましく、3.8以下が更に好ましく、3.5以下が特に好ましく、3.2以下が極めて好ましく、3以下が非常に好ましい。研磨剤のpHは、取り扱いの安全面に優れる観点、及び、充分な機械的研磨力が得られやすく、SiH4酸化膜及びTEOS酸化膜の高い研磨速度が得られやすい観点から、2.0以上が好ましく、2.3以上がより好ましく、2.5以上が更に好ましく、2.7以上が特に好ましく、3.0以上が極めて好ましい。これらの観点から、研磨剤のpHは、2.0~4.0が好ましい。pHは液温25℃におけるpHと定義する。
本実施形態に係る研磨剤は、少なくとも砥粒、アミン化合物及び水を含む一液式研磨剤として保存してもよく、スラリ(第一の液)と、添加液(第二の液)とを有する複数液式研磨剤として保存してもよい。複数液式研磨剤では、スラリと添加液とを混合して前記研磨剤となるように前記研磨剤の構成成分がスラリと添加液とに分けられる。スラリは、例えば、少なくとも砥粒及び水を含む。添加液は、例えば、少なくともアミン化合物及び水を含む。添加剤(アミン化合物、防食剤、酸化剤、キレート剤、有機溶媒、界面活性剤等)は、スラリ及び添加液のうち添加液に含まれることが好ましい。なお、研磨剤の構成成分は、三液以上に分けて保存してもよい。
本実施形態に係る研磨方法は、研磨剤を用いて、被研磨膜の少なくとも一部を研磨して除去する研磨工程を備える。被研磨膜は、Si-O結合を有する絶縁膜を含んでよく、酸化ケイ素膜を含んでよい。例えば、被研磨膜は、SiH4酸化膜を含んでよく、TEOS酸化膜を含んでよい。研磨工程では、研磨剤を用いて、被研磨膜(例えば酸化ケイ素膜)を有する基体の前記被研磨膜の少なくとも一部を研磨して除去することができる。基体は、例えば、表面に凹部及び凸部を有する基板上に形成された膜を有してもよい。基体は、例えば、配線板又は回路基板であってもよい。基体は、基板表面全体に酸化ケイ素膜のみが形成されたものに限らず、基板表面に酸化ケイ素膜の他に窒化ケイ素膜、多結晶シリコン膜等を更に有するものであってもよい。また、当該研磨方法は、所定の配線を有する配線板上に、酸化ケイ素膜、ガラス、窒化ケイ素等の無機絶縁膜;ポリシリコン、Al等を主として含有する膜などが形成された基体に対しても適用できる。研磨工程では、酸化ケイ素膜に加えて金属材料を有する基体を研磨してよい。
(実施例1)
砥粒(コロイダルシリカ、平均粒径:60nm)3.0質量部、アントラニル酸0.10質量部、ベンゾトリアゾール0.10質量部、マロン酸0.11質量部、及び、超純水X質量部を混合した後に30質量%の過酸化水素水を0.20質量部混合することにより研磨剤100質量部を得た。なお、超純水の配合量(X質量部)は、研磨剤が100質量部になるよう計算して調整した。研磨剤のpHは3であった。
アミン化合物を表1の化合物(ニコチンアミド、ピラジンアミド又は5-アミノ-1H-テトラゾール)に変更すると共に、pHが3となるように酸の量を調整したこと以外は、実施例1と同様の方法で研磨剤を調製した。
砥粒(コロイダルシリカ、平均粒径:60nm)3.0質量部、ベンゾトリアゾール0.10質量部、マロン酸0.09質量部、及び、超純水X質量部を混合した後に30質量%の過酸化水素水を0.20質量部混合することにより研磨剤100質量部を得た。なお、超純水の配合量(X質量部)は、研磨剤が100質量部になるよう計算して調整した。研磨剤のpHは3であった。
砥粒(コロイダルシリカ、平均粒径:60nm)3.0質量部、ベンゾトリアゾール0.10質量部、マロン酸0.09質量部、10%希釈された水酸化カリウム(KOH、塩基、pH調整剤)、及び、超純水X質量部を混合した後に30質量%の過酸化水素水を0.20質量部混合することにより研磨剤100質量部を得た。なお、超純水の配合量(X質量部)は、研磨剤が100質量部になるよう計算して調整した。研磨剤のpHは10であった。
砥粒(コロイダルシリカ、平均粒径:60nm)3.0質量部、ピラジンカルボン酸0.10質量部、ベンゾトリアゾール0.10質量部、マロン酸0.09質量部、及び、超純水X質量部を混合した後に30質量%の過酸化水素水を0.20質量部混合することにより研磨剤100質量部を得た。なお、超純水の配合量(X質量部)は、研磨剤が100質量部になるよう計算して調整した。研磨剤のpHは3であった。
研磨剤中における砥粒のゼータ電位を下記のとおり測定した。ゼータ電位の測定装置としては、ベックマン・コールター社製の商品名:DELSA NANO Cを用いた。ゼータ電位の測定装置において測定サンプルの散乱強度が1.0×104~5.0×104cpsとなるように研磨剤を純水で希釈してサンプルを得た。その後、得られたサンプルをゼータ電位測定用セルに入れてゼータ電位を測定した。結果を表1に示す。
研磨剤のpHは、下記の条件で測定した。結果を表1に示す。
測定温度:25±5℃
測定装置:株式会社堀場製作所の商品名:Model(F-51)
測定方法:フタル酸塩pH標準液(pH:4.01)と、中性リン酸塩pH標準液(pH:6.86)と、ホウ酸塩pH標準液(pH:9.18)とをpH標準液として用いてpHメーターを3点校正した後、pHメーターの電極を研磨剤に入れて、2min以上経過して安定した後のpHを前記測定装置により測定した。
被研磨膜を有する評価用基体として、膜厚200nmのSiH4酸化膜をシリコン基板上に有する基体、及び、膜厚500nmのTEOS酸化膜をシリコン基板上に有する基体を用いた。上述の研磨剤を用いて、下記研磨条件にて60秒間評価用基体の被研磨膜を化学機械研磨した。
研磨装置:300mm基板用研磨装置(アプライドマテリアルズ社製、商品名:Reflexion LK)
研磨布:スウェード状発泡ポリウレタン樹脂製研磨布
定盤回転数:90回/min
研磨圧力:17kPa
研磨剤の供給量:300mL/min
Claims (11)
- 砥粒と、アミン化合物と、金属防食剤と、水と、を含有し、
前記砥粒がシリカ粒子を含み、
前記砥粒のゼータ電位が正であり、
前記アミン化合物がアミド化合物を含み、
前記アミン化合物の含有量が0.01~10質量%である、研磨剤(但し、(A)1,2,3-トリアゾロ[4,5-b]ピリジン骨格を有する化合物を含む金属防食剤と、(B)CMP研磨液中で正のゼータ電位を有する砥粒と、(C)酸化金属溶解剤と、(D)酸化剤と、を含有する、CMP研磨液を除く)。 - 前記シリカ粒子がコロイダルシリカを含む、請求項1に記載の研磨剤。
- 前記アミン化合物が芳香族アミン化合物を含む、請求項1又は2に記載の研磨剤。
- 前記アミン化合物がニコチンアミドを含む、請求項1~3のいずれか一項に記載の研磨剤。
- 前記アミン化合物がピラジンアミドを含む、請求項1~4のいずれか一項に記載の研磨剤。
- 酸化剤を更に含有する、請求項1~5のいずれか一項に記載の研磨剤。
- キレート剤を更に含有する、請求項1~6のいずれか一項に記載の研磨剤。
- pHが2.0~4.0である、請求項1~7のいずれか一項に記載の研磨剤。
- SiH4酸化膜の研磨に用いられる、請求項1~8のいずれか一項に記載の研磨剤。
- 請求項1~9のいずれか一項に記載の研磨剤を用いて、被研磨膜の少なくとも一部を研磨して除去する工程を備える、研磨方法。
- 前記被研磨膜がSiH4酸化膜を含む、請求項10に記載の研磨方法。
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