JP5147185B2 - 研磨組成物及び研磨方法 - Google Patents
研磨組成物及び研磨方法 Download PDFInfo
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- JP5147185B2 JP5147185B2 JP2006015500A JP2006015500A JP5147185B2 JP 5147185 B2 JP5147185 B2 JP 5147185B2 JP 2006015500 A JP2006015500 A JP 2006015500A JP 2006015500 A JP2006015500 A JP 2006015500A JP 5147185 B2 JP5147185 B2 JP 5147185B2
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- Prior art keywords
- acid
- polishing
- polishing composition
- film
- chemical mechanical
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- CIHOLLKRGTVIJN-UHFFFAOYSA-N tert‐butyl hydroperoxide Chemical compound CC(C)(C)OO CIHOLLKRGTVIJN-UHFFFAOYSA-N 0.000 description 1
- 229940034208 thyroxine Drugs 0.000 description 1
- XUIIKFGFIJCVMT-UHFFFAOYSA-N thyroxine-binding globulin Natural products IC1=CC(CC([NH3+])C([O-])=O)=CC(I)=C1OC1=CC(I)=C(O)C(I)=C1 XUIIKFGFIJCVMT-UHFFFAOYSA-N 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
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000004408 titanium dioxide Substances 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
- LDHQCZJRKDOVOX-UHFFFAOYSA-N trans-crotonic acid Natural products CC=CC(O)=O LDHQCZJRKDOVOX-UHFFFAOYSA-N 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- OUYCCCASQSFEME-UHFFFAOYSA-N tyrosine Natural products OC(=O)C(N)CC1=CC=C(O)C=C1 OUYCCCASQSFEME-UHFFFAOYSA-N 0.000 description 1
- 229940005605 valeric acid Drugs 0.000 description 1
- 239000004474 valine Substances 0.000 description 1
Images
Classifications
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- 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
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- 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
-
- 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
- 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
-
- 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
- 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]
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- Microelectronics & Electronic Packaging (AREA)
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Description
本発明の研磨組成物に含有されるジカルボン酸は、1分子中に2つのカルボキシル基を有するものであり、環状構造、不飽和結合、分岐構造を有していてもよく、好ましくは脂肪族ジカルボン酸、より好ましくは直鎖の飽和ジカルボン酸である。2種以上のジカルボン酸の混合物を用いることもできる。
本発明の研磨組成物に用いられる酸化剤は、金属又は金属合金などを酸化し、研磨速度向上に寄与する。上記酸化剤としては、酸素、オゾン、過酸化水素、t−ブチルハイドロパーオキサイド、エチルベンゼンハイドロパーオキサイドなどのアルキルパーオキサイド、過酢酸、過安息香酸などの過酸、過マンガン酸カリウムなどの過マンガン酸塩、過ヨウ素酸カリウムなどの過ヨウ素酸塩、過硫酸アンモニウム、過硫酸カリウムなどの過硫酸塩、ポリオキソ酸、次亜塩素酸カリウムなどの次亜塩素酸塩などを挙げることができる。これらの酸化剤のうち、取り扱いやすい過酸化水素、過硫酸塩、次亜塩素酸塩が好ましく、特に過酸化水素が好ましい。
本発明の研磨組成物に含有される砥粒としては、シリカ、酸化セリウム、酸化アルミニウム、水酸化アルミニウム、二酸化チタン、有機砥粒が挙げることができる。スクラッチの発生を防ぐためには、粒径が小さく、鋭角部分を有さない、球状に近い砥粒が好ましく、シリカ、特にコロイダルシリカを用いることが望ましい。これら砥粒は一種のみを含有しても良いし、二種以上を混合して含有しても良い。砥粒の一次粒子径としては、70nm以下が好ましく、40nm以下がさらに好ましい。
本発明の研磨組成物は、幅広いpH範囲、特に2〜4又は8〜12のpH範囲で好ましく使用することができる。
本発明の研磨組成物は随意に、更なる酸若しくはその塩、及び/又はアルカリ金属イオンを含有することができる。これらの酸としては、カルボン酸、スルホン酸及びアミノ酸のような有機酸、並びに硫酸、リン酸、ホスホン酸、塩酸及び硝酸のような無機酸からなる群より選択される1又は複数の成分を挙げることができる。
本発明の研磨組成物に、スルホン酸、カルボン酸及びアミノ酸のような有機酸、並びに硫酸、リン酸、ホスホン酸、硝酸のような無機酸からなる群より選択される更なる酸を含有させることにより、銅等の金属の研磨速度を大きくし、配線金属、バリア金属、絶縁膜の研磨速度比を調節できる。これらの化合物は、金属酸化物を水溶化する性質があり、良好な研磨特性を維持できる程度に少量含有させるのが好ましい。通常は0.1質量%以下である。
本発明の研磨組成物に含有させることができるアルカリ金属イオンは、任意のアルカリ金属イオン、好ましくはカリウムイオンである。また、このアルカリ金属イオンは、任意の化合物から供給することができ、例えば水酸化ナトリウム、水酸化カリウム、炭酸カリウム、炭酸水素カリウムから供給することができ、好ましくは水酸化カリウムから供給することができる。本発明の研磨組成物のpHを調整する場合には、水酸化物を用いると調整しやすく、好ましい。
本発明の研磨組成物が好ましく通用される被研磨対象物としては、金属及び絶縁膜を挙げることができる。本発明の組成物は、これら被研磨対象物のすべて又は一部を除去する場合のいずれにも好ましく用いることができる。
本発明の研磨組成物を用いた研磨方法は、研磨定盤の研磨布上に本発明の研磨組成物を供給しながら、例えば被研磨金属膜を有する基板を研磨布に押し当てた状態で研磨定盤と基板を相対的に動かすことによって被研磨金属膜を研磨する方法である。研磨する装置としては、半導体基板を保持するホルダーと研磨布を貼り付けた定盤を有する一般的な研磨装置が使用できる。
ここで使用したウエハは下記のようなものである。
タンタル膜が均一に付いたシリコンウエハ。
タンタル膜付きブランケットウエハのタンタル膜上に銅膜が均一に付いたシリコンウエハ。
CVD法で形成した酸化ケイ素膜が均一に付いたシリコンウエハ。
溝2深さが500nmで、ライン2’/スペース3が100μm/100μm(あるいは9μm/1μm)の銅配線パターン形成用シリコンウエハ1に、25nmの厚さのタンタルバリア膜4を形成し、全面に1000nmの厚さの銅膜5を付けて、図1(a)に示すパターンウエハを得た。このパターンウエハを、タンタルに対する銅の研磨速度が充分大きい銅及び銅合金用の研磨液を用いて研磨し、絶縁膜部上にバリア層が露出した状態でディッシング量が50nm以下になるようにして、図1(b)に示す基板サンプルを作成した。
ウエハの研磨に使用した研磨条件は下記のようなものである。
ウエハ寸法:4×4cm
線速度:70m/分
研磨パッド:ロデールニッタ社製IC1400
研磨組成物供給速度:13ml/分
研磨圧力:15kPa
研磨特性は下記のようにして測定した。
膜のシート抵抗値から研磨前後の銅膜、タンタル膜の膜厚を測定し、これらの値と研磨時間から研磨速度を換算した。
光干渉式の膜厚測定装置を用いて、研磨前後の酸化ケイ素膜の膜厚を測定し、これらの値と研磨時間から研磨速度を換算した。
実施例及び比較例の研磨液を用いてタンタル膜付きブランケットウエハを研磨し、タンタルの研磨速度を求めて、25nmのタンタルを研磨するのに必要な研磨時間を算出した。それぞれの実施例及び比較例の研磨組成物を用いて、タンタルのバリア膜が露出した基板サンプルを、この算出された時間に加えて30秒間にわたって研磨した。図2に示されるように100μmスペース部3”と100μmライン部2”との段差dをディッシングとして評価した。尚、ここでは触診式の段差計を用いて段差の測定を行った。
実施例及び比較例の研磨液を用いてタンタル膜付きブランケットウエハを研磨し、タンタルの研磨速度を求めて、25nmのタンタルを研磨するのに必要な研磨時間を算出した。それぞれの実施例及び比較例の研磨組成物を用いて、タンタルのバリア膜が露出した基板サンプルを、この算出された時間に加えて30秒間にわたって研磨した。図3の如く、9μm/1μmライン/スペースのスペース部の層間絶縁膜の目減りeをエロージョンとして測定した。尚、ここでは触診式の段差計を用いて段差の測定を行った。
参考例1〜12、実施例9、並びに比較例1〜6の研磨組成物の組成(質量%)を表1に示す。
結果を表2に示す。
2、2’、2” ライン
3、3’、3” スペース
d ディッシング
e エロージョン
Claims (6)
- 0.01〜5質量%の3−メチルアジピン酸、セバシン酸、トリデカン二酸、又はそれらの混合物である、炭素数7〜13の脂肪族ジカルボン酸、
0.1質量%以下のメタンスルホン酸、ベンゼンスルホン酸、p−トルエンスルホン酸、キュメンスルホン酸、乳酸、硫酸、又はそれらの混合物である、更なる酸、
0.1〜10質量%の過酸化水素である、酸化剤、
0.1〜10質量%のコロイダルシリカである、砥粒、及び
水
を含有し、かつpHが2〜4である、化学的機械的研磨組成物。 - カリウムイオンを含有する、請求項1に記載の化学的機械的研磨組成物。
- 前記脂肪族ジカルボン酸の量が、0.3〜5質量%である、請求項1又は2に記載の化学的機械的研磨組成物。
- 凹部を有する絶縁膜である酸化ケイ素膜、前記絶縁膜上に形成されたバリア膜であるタンタル膜、及び前記バリア膜を覆うようにして前記凹部に埋め込まれた配線材料膜である銅膜を有する基板を、請求項1〜3のいずれか一項に記載の化学的機械的研磨組成物で平坦化する工程を含む基板の研磨方法。
- 水で希釈して請求項1〜3のいずれか一項に記載の化学的機械的研磨組成物となる組成物。
- 複数の組成物からなるキットであって、それらの組成物を混合することによって、又は混合及び水で希釈することによって、請求項1〜3のいずれか一項に記載の化学的機械的研磨組成物が得られる複数の組成物からなるキット。
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2006
- 2006-01-24 EP EP06701467.0A patent/EP1841831B1/en not_active Not-in-force
- 2006-01-24 JP JP2006015500A patent/JP5147185B2/ja not_active Expired - Fee Related
- 2006-01-24 US US11/794,201 patent/US8592314B2/en active Active
- 2006-01-24 WO PCT/JP2006/301382 patent/WO2006078074A2/en active Application Filing
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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JP7386593B2 (ja) | 2018-03-30 | 2023-11-27 | 大日本印刷株式会社 | 化粧材、化粧材の製造方法 |
JP7386594B2 (ja) | 2018-03-30 | 2023-11-27 | 大日本印刷株式会社 | 化粧材、化粧材の製造方法 |
Also Published As
Publication number | Publication date |
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US20080087644A1 (en) | 2008-04-17 |
WO2006078074A3 (en) | 2007-02-01 |
EP1841831A2 (en) | 2007-10-10 |
US8592314B2 (en) | 2013-11-26 |
JP5539433B2 (ja) | 2014-07-02 |
EP1841831B1 (en) | 2014-04-02 |
JP2006229215A (ja) | 2006-08-31 |
JP2012169649A (ja) | 2012-09-06 |
WO2006078074A2 (en) | 2006-07-27 |
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