JP6631520B2 - Cmp用研磨液及び研磨方法 - Google Patents
Cmp用研磨液及び研磨方法 Download PDFInfo
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- JP6631520B2 JP6631520B2 JP2016532955A JP2016532955A JP6631520B2 JP 6631520 B2 JP6631520 B2 JP 6631520B2 JP 2016532955 A JP2016532955 A JP 2016532955A JP 2016532955 A JP2016532955 A JP 2016532955A JP 6631520 B2 JP6631520 B2 JP 6631520B2
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- Prior art keywords
- polishing
- cmp
- metal
- cobalt
- group
- Prior art date
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Classifications
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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
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/3205—Deposition of non-insulating-, e.g. conductive- or resistive-, layers on insulating layers; After-treatment of these layers
- H01L21/321—After treatment
- H01L21/32115—Planarisation
- H01L21/3212—Planarisation by chemical mechanical polishing [CMP]
-
- 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
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- 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
- B24B37/042—Lapping machines or devices; Accessories designed for working plane surfaces operating processes therefor
- B24B37/044—Lapping machines or devices; Accessories designed for working plane surfaces operating processes therefor characterised by the composition of the lapping agent
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09G—POLISHING COMPOSITIONS; SKI WAXES
- C09G1/00—Polishing compositions
- C09G1/02—Polishing compositions containing abrasives or grinding agents
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K13/00—Etching, surface-brightening or pickling compositions
- C09K13/04—Etching, surface-brightening or pickling compositions containing an inorganic acid
- C09K13/06—Etching, surface-brightening or pickling compositions containing an inorganic acid with organic material
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/14—Anti-slip materials; Abrasives
- C09K3/1409—Abrasive particles per se
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/14—Anti-slip materials; Abrasives
- C09K3/1454—Abrasive powders, suspensions and pastes for polishing
- C09K3/1463—Aqueous liquid suspensions
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
- C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
- C23F11/10—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids using organic inhibitors
- C23F11/14—Nitrogen-containing compounds
- C23F11/149—Heterocyclic compounds containing nitrogen as hetero atom
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- 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
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- 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
- H01L21/304—Mechanical treatment, e.g. grinding, polishing, cutting
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- 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
- H01L21/306—Chemical or electrical treatment, e.g. electrolytic etching
- H01L21/30625—With simultaneous mechanical treatment, e.g. mechanico-chemical polishing
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/768—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
- H01L21/76838—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the conductors
- H01L21/76841—Barrier, adhesion or liner layers
- H01L21/76853—Barrier, adhesion or liner layers characterized by particular after-treatment steps
- H01L21/76865—Selective removal of parts of the layer
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- 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
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/3105—After-treatment
- H01L21/31051—Planarisation of the insulating layers
- H01L21/31053—Planarisation of the insulating layers involving a dielectric removal step
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- 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
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Description
本発明は、2014年7月9日に出願された特願2014−141533号に記載の主題と関連しており、その開示内容は、参照によりここに援用される。
「工程」には、独立した工程だけではなく、他の工程と明確に区別できない場合であっても、当該「工程」において規定される操作が実施される限り、他の工程と明確に区別できない工程も含まれる。
「〜」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。
CMP用研磨液中の各成分の含有量は、CMP用研磨液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、CMP用研磨液中に存在する当該複数の物質の合計量を意味する。
<CMP用研磨液>
本実施形態に係るCMP用研磨液は、コバルト含有部と、コバルト以外の金属を含有する金属含有部とを少なくとも有する被研磨面の研磨に用いられるCMP用研磨液である。
CMP用研磨液は、砥粒を含有する。砥粒の含有により、コバルト含有部の近傍に設けられた、金属含有部の研磨速度が向上する傾向がある。砥粒は、一種を単独で、又は二種以上を混合して用いることができる。
CMP用研磨液は、金属防食剤を含有する。金属防食剤の含有により、コバルト含有部に対し、良好な研磨速度を保ちながらガルバニック腐食を効果的に抑制できる。金属防食剤は、一種を単独で、又は二種以上を混合して用いることができる。
CMP用研磨液は、有機酸類を更に含有してもよい。有機酸類は、コバルト含有部及び金属含有部に対する研磨速度を向上させる効果を有する。有機酸類には、有機酸、有機酸の塩、有機酸の無水物、及び有機酸のエステルが含まれる(後述する「水溶性ポリマ」は、有機酸類には含まれないものとする)。有機酸類の中でも、コバルト含有部の腐食を抑制する観点から、フタル酸類が好ましい。フタル酸類を用いることにより、コバルト含有部の良好な研磨速度が得られるとともに、腐食を抑制できる。フタル酸類には、フタル酸、フタル酸の塩、フタル酸の無水物、及びフタル酸のエステルが含まれ、これらは置換基を有しても、置換基を有しなくてもよい。有機酸としてフタル酸類を使用する場合、更に他の有機酸を併用することも可能である。フタル酸類を用いることによる効果を効率よく得るという観点から、フタル酸類を単独で使用することも可能である。フタル酸類は、特に、金属防食剤としてピリジン類及びアゾール類からなる群から選択される少なくとも一種、より好ましくは、ピリジン類、テトラゾール類、トリアゾール類及びベンゾトリアゾール類からなる群から選択される少なくとも一種と共に使用した場合に、高い効果が得られる。
CMP用研磨液は、金属酸化剤を含有することが好ましい。金属酸化剤としては、特に制限はないが、例えば、過酸化水素、ペルオキソ硫酸塩、硝酸、過ヨウ素酸カリウム、次亜塩素酸、オゾン等が挙げられる。金属含有部の研磨速度を向上させる観点から、過酸化水素が特に好ましい。金属酸化剤は、一種を単独で、又は二種以上を混合して用いることができる。
CMP用研磨液は、有機溶媒を更に含有してもよい。有機溶媒の含有により、コバルト含有部の近傍に設けられた金属含有部に対する、CMP用研磨液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、水と混合できるものが好ましく、25℃において、水100gに対して0.1g以上溶解するものがより好ましい。有機溶媒は、一種を単独で、又は二種以上を混合して用いることができる。
CMP用研磨液は、水溶性ポリマを更に含有してもよい。水溶性ポリマの含有により、コバルト含有部のガルバニック腐食の抑制、被研磨面の保護、欠陥(ディフェクト)発生の低減等が可能である。水溶性ポリマは、25℃において、水100gに対して0.1g以上溶解するものが好ましい。水溶性ポリマは、一種を単独で、又は二種以上を混合して用いることができる。
検出器:株式会社日立製作所製、RI−モニター「L−3000」
インテグレーター:株式会社日立製作所製、GPCインテグレーター「D−2200」
ポンプ:株式会社日立製作所製「L−6000」
デガス装置:昭和電工株式会社製「Shodex DEGAS」
カラム:日立化成株式会社製「GL−R440」、「GL−R430」、及び「GL−R420」をこの順番で連結して使用
溶離液:テトラヒドロフラン(THF)
測定温度:23℃
流速:1.75mL/min
測定時間:45min
注入量:10μL
標準ポリアクリル酸:日立化成テクノサービス株式会社製「PMAA−32」
CMP用研磨液は、第四級ホスホニウム塩を更に含有してもよい。第四級ホスホニウム塩の含有により、被研磨面の保護、金属含有部及び絶縁材料部(例えば、Low−k膜)の研磨の抑制等が可能である。
CMP用研磨液は水を含有する。水は、特に制限されるものではないが、純水を好ましく用いることができる。水は残部として配合されていればよく、含有量に特に制限はない。
CMP用研磨液のpHは、4.0以下である。pHが4.0以下である場合、コバルト含有部及び金属含有部の研磨速度に優れる。好ましくは3.8以下であり、より好ましくは3.6以下であり、更に好ましくは3.5以下である。また、CMP用研磨液のpHは、コバルト含有部及び金属含有部のガルバニック腐食を抑制する観点、また、酸性が強いことによる取扱い難さを解消する観点から、2.0以上が好ましく、2.5以上がより好ましく、2.8以上が更に好ましい。
CMP用研磨液は、コバルト含有部と金属含
有部とを有する被研磨面の研磨に用いられる。CMP用研磨液は、当該CMP用研磨液中において、コバルトの腐食電位EAとコバルト以外の金属の腐食電位EBとを測定した場合に、腐食電位差EA−EBの絶対値として0〜300mVを与える。腐食電位差EA−EBの絶対値が0〜300mVであるCMP用研磨液を用いることによって、コバルト含有部がガルバニック腐食を受けることを抑制できる。
本実施形態に係る研磨方法は、前記実施形態のCMP用研磨液を用い、コバルト含有部と、コバルト以外の金属を含有する金属含有部とを少なくとも有する被研磨面の、コバルト含有部の少なくとも一部を研磨して除去する研磨方法である。好ましくは、少なくとも一方の面に、コバルト含有部及び金属含有部が形成された基板に対し、コバルト含有部の余分の部分を研磨して除去する研磨方法である。より具体的には、基板のコバルト含有部及び金属含有部が形成された面と研磨定盤上の研磨パッドとの間に、前記実施形態のCMP用研磨液を供給しながら、基板を研磨パッドに押圧した状態で、基板と研磨定盤とを相対的に動かすことによってコバルト含有部の少なくとも一部を研磨して除去する研磨方法である。
表1〜3に示す各成分を用いてCMP用研磨液を下記の方法で作製した。
(実施例1〜7及び比較例1〜3)
表1〜3に示す種類の金属防食剤と、有機溶媒として3−メトキシ−3−メチル−1−ブタノールと、水溶性ポリマとしてポリアクリル酸アンモニウム塩(重量平均分子量8,000)と、砥粒としてコロイダルシリカ(平均二次粒径60nm)と、第四級ホスホニウム塩としてテトラフェニルホスホニウムブロミドとを容器に入れ、更に超純水を注ぎ、撹拌により混合して全成分を溶解させた。酸化剤として過酸化水素水(30質量%水溶液)を添加した後、超純水を加えて全体を100質量部とし、CMP用研磨液を得た。
表2及び3に示す種類の金属防食剤と、表2及び3に示す種類の有機酸と、有機溶媒として3−メトキシ−3−メチル−1−ブタノールと、水溶性ポリマとしてポリアクリル酸アンモニウム塩(重量平均分子量8,000)と、砥粒としてコロイダルシリカ(平均粒径60nm)と、第四級ホスホニウム塩としてテトラフェニルホスホニウムブロミドとを容器に入れ、更に超純水を注ぎ、撹拌により混合して全成分を溶解させた。酸化剤として過酸化水素水(30質量%水溶液)を添加した後、超純水を加えて全体を100質量部とし、CMP用研磨液を得た。
CMP用研磨液のpHを下記に従って測定した。
測定温度:25℃
測定器:電気化学計器株式会社製「PHL−40」
測定方法:標準緩衝液(フタル酸塩pH緩衝液 pH:4.01(25℃)、中性リン酸塩pH緩衝液 pH:6.86(25℃)、ホウ酸塩pH緩衝液 pH:9.18(25℃)を用いて、3点校正した後、電極をCMP用研磨液に入れて、3min以上経過して安定した後の値を測定した。結果を表1〜3に示す。
CMP用研磨液を用い、下記に従って腐食電位差EA−EBの測定を行った。なお、本実施例では、CMP用研磨液を、後述する「コバルト含有部」と、コバルト以外の金属を含有する金属含有部として「銅」とを有する被研磨面の研磨に用いるため、腐食電位EAとしてコバルトの腐食電位を、腐食電位EBとして銅の腐食電位を測定した。結果を表1〜3に示す。
以下の項目により、実施例1〜10及び比較例1〜5のCMP用研磨液の評価を行った。
[被研磨基板1(ブランケット基板)]
シリコン基板(直径12インチウエハ)に厚さ200nmのコバルト層を形成し、ブランケット基板を得た。このブランケット基板を被研磨基板1とした。
実施例1〜10及び比較例1〜5のCMP用研磨液を用いて、下記研磨条件で被研磨基板1をそれぞれ1min、CMPした。
研磨パッド:発泡ポリウレタン樹脂製研磨パッド
定盤回転数:93min−1
研磨ヘッド回転数:87min−1
研磨圧力:10.3kPa(1.5psi)
CMP用研磨液の供給量:300mL/min
研磨時間:1min
前記で研磨した被研磨基板1の被研磨面にスポンジブラシ(ポリビニルアルコール系樹脂製)を押し付けた後、蒸留水を被研磨基板1に供給しながら被研磨基板1とスポンジブラシとを回転させ、1min洗浄した。次に、スポンジブラシを取り除いた後、被研磨基板1の被研磨面に蒸留水を1min間供給した。最後に被研磨基板1を高速で回転させて蒸留水を弾き飛ばして被研磨基板1を乾燥した。
研磨速度を下記のように評価した。
種々の膜厚を有するコバルト層を形成したブランケット基板の抵抗値から検量線を得て、下記式(1)より、研磨前と研磨後のコバルト層の膜厚をそれぞれ求めた。
研磨前後のコバルト層の膜厚[nm]=104.5×(被研磨基板1の抵抗値[mΩ]/1000)−0.893・・・(1)
コバルト層の研磨速度(Co−RR)[nm/min]=(研磨前のコバルト層の膜厚[nm]―研磨後のコバルト層の膜厚[nm])/1[min]・・・(2)
抵抗値の測定には、株式会社日立国際電気製、金属膜厚測定装置「VR−120/08S」を用いた。測定結果を「コバルト研磨速度」として表1〜3に示す。
上記においてCMPした後の被研磨基板1について、目視観察及び光学顕微鏡観察を行い、研磨傷の発生の有無を確認した。その結果、全ての実施例及び比較例において顕著な研磨傷の発生は認められなかった。
[被研磨基板2(パターン基板)の作製]
直径12インチ(30.5cm)(φ)サイズの銅配線付きパターン基板(Advanced Material Technology社製「SEMATECH754CMPパターン」)を用意した。パターン基板は、二酸化ケイ素からなる層間絶縁膜(厚さ3500Å);窒化タンタルからなるバリア金属層(厚さ60Å);コバルトからなるバリア金属層(厚さ60Å);及び、銅からなる導電性物質層を有していた。導電性物質層は、配線幅が180nmであり、配線密度が50%であるパターンを有していた(幅180nmの層間絶縁膜と幅(バリア金属層を含む)180nmの銅配線とが交互に並んだパターン)。凹部(溝部)以外の銅を、銅用研磨液を用いて公知のCMP法により研磨し、凸部上のバリア金属層を被研磨面に露出させ、被研磨基板2を得た。被研磨基板2を2cm×2cmの小片に切断し、下記のCMPに使用した。
実施例1〜10及び比較例1〜5のCMP用研磨液を用いて、下記研磨条件で被研磨基板2をそれぞれ30sec、CMPした。
研磨装置:日本エンギス株式会社製「ラッピングマシーンIMPTEC 10DVT」)
研磨パッド:発泡ポリウレタン樹脂製研磨パッド
研磨圧力:30kPa(4.4psi)
定盤回転数:90min−1
CMP用研磨液の供給量:15mL/min
研磨時間:30sec
研磨後の被研磨基板2のガルバニック腐食を下記条件により評価した。すなわち、研磨後の被研磨基板2における配線幅が180nmであり、配線密度が50%である部分を、日立ハイテクノロジーズ株式会社製「電界放出形電子顕微鏡S−4800」を用いて観察した。ガルバニック腐食が全く確認されなかった場合(コバルトと銅の界面付近において、コバルトのエッチングが全く確認されなかった場合)を良好な結果と評価し、表1〜3中に「A」として記した。ガルバニック腐食が確認された場合を、表1〜3中に「B」として記した。
2 バリア金属部
2a コバルト含有部
2b バリア金属部
3 導電性物質部
3a コバルト以外の金属を含有する金属含有部
10、110、210 研磨前の基板
20、120、220 第一の研磨工程後の基板
30、130、230 第二の研磨工程後の基板
11 貫通孔
12 上部治具
13 下部治具
14 基板
15 CMP用研磨液
16 カウンター電極
17 参照電極
Claims (18)
- 研磨粒子、金属防食剤、及び水を含有し、pHが3.3以下であるCMP用研磨液であって、
当該CMP用研磨液中でコバルトの腐食電位EAとコバルト以外の金属の腐食電位EBとを測定した場合、腐食電位EAと腐食電位EBとの腐食電位差EA−EBの絶対値が0〜220mVとなり、
コバルト含有部と、前記金属を含有する金属含有部とを少なくとも有する被研磨面の研磨に用いられる、CMP用研磨液。 - 前記金属防食剤が、ピリジン類及びアゾール類からなる群から選択される少なくとも一種を含む、請求項1に記載のCMP用研磨液。
- フタル酸類を更に含有する、請求項1又は2に記載のCMP用研磨液。
- 研磨粒子、水、並びに、ピリジン類、テトラゾール類、トリアゾール類、ベンゾトリアゾール類及びフタル酸類からなる群から選択される少なくとも二種を含有し、pHが3.3以下であるCMP用研磨液であって、
当該CMP用研磨液中でコバルトの腐食電位E A とコバルト以外の金属の腐食電位E B とを測定した場合、腐食電位E A と腐食電位E B との腐食電位差E A −E B の絶対値が0〜220mVとなり、
コバルト含有部と、前記金属を含有する金属含有部とを少なくとも有する被研磨面の研磨に用いられる、CMP用研磨液。 - 前記金属が、銅である、請求項1〜4のいずれかに記載のCMP用研磨液。
- 研磨粒子、水、ピリジン類及びテトラゾール類からなる群から選択される少なくとも一種、並びに、トリアゾール類及びベンゾトリアゾール類からなる群から選択される少なくとも一種を含有する、請求項2〜5のいずれか一項に記載のCMP用研磨液。
- 研磨粒子、水、並びに、トリアゾール類及びベンゾトリアゾール類からなる群から選択される少なくとも二種を含有する、請求項2〜5のいずれか一項に記載のCMP用研磨液。
- 研磨粒子、水、ピリジン類、テトラゾール類、トリアゾール類及びベンゾトリアゾール類からなる群から選択される少なくとも一種、並びに、フタル酸類を含有する、請求項2〜5のいずれか一項に記載のCMP用研磨液。
- 第四級ホスホニウム塩を更に含有する、請求項1〜8のいずれか一項に記載のCMP用研磨液。
- 前記第四級ホスホニウム塩が、トリアリールホスホニウム塩及びテトラアリールホスホニウム塩からなる群から選択される少なくとも一種を含む、請求項9に記載のCMP用研磨液。
- 前記研磨粒子が、シリカ粒子、アルミナ粒子、セリア粒子、チタニア粒子、ジルコニア粒子、ゲルマニア粒子、及びこれらの変性物からなる群から選択される少なくとも一種を含む、請求項1〜10のいずれか一項に記載のCMP用研磨液。
- 金属酸化剤を更に含有する、請求項1〜11のいずれか一項に記載のCMP用研磨液。
- 有機溶媒を更に含有する、請求項1〜12のいずれか一項に記載のCMP用研磨液。
- 請求項1〜13のいずれか一項に記載のCMP用研磨液を用い、コバルト含有部と、コバルト以外の金属を含有する金属含有部とを少なくとも有する被研磨面の、前記コバルト含有部の少なくとも一部を研磨して除去する、研磨方法。
- 表面に凹部及び凸部を有する絶縁材料部と、前記凹部及び凸部に沿って前記絶縁材料部を被覆するバリア金属部と、前記凹部を充填して前記バリア金属部を被覆する導電性物質部とを有し、前記バリア金属部がコバルト含有部を有し、前記導電性物質部がコバルト以外の金属を含有する金属含有部を有する基板を用意する工程、
前記導電性物質部を研磨して前記凸部上の前記バリア金属部を露出させる第一の研磨工程、及び、
前記第一の研磨工程で露出した前記バリア金属部を請求項1〜13のいずれか一項に記載のCMP用研磨液により研磨して除去する第二の研磨工程、
を有する、研磨方法。 - 前記絶縁材料部が、シリコン系絶縁体又は有機ポリマ系絶縁体を含有する、請求項15に記載の研磨方法。
- 前記導電性物質部が、銅を主成分とする、請求項15又は16に記載の研磨方法。
- 前記バリア金属部が、コバルト含有部と、タンタル含有部、チタン含有部、タングステン含有部及びルテニウム含有部からなる群から選択される少なくとも一種とを有する、請求項15〜17のいずれか一項に記載の研磨方法。
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