JP5327050B2 - 金属用研磨液及び研磨方法 - Google Patents
金属用研磨液及び研磨方法 Download PDFInfo
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- JP5327050B2 JP5327050B2 JP2009525396A JP2009525396A JP5327050B2 JP 5327050 B2 JP5327050 B2 JP 5327050B2 JP 2009525396 A JP2009525396 A JP 2009525396A JP 2009525396 A JP2009525396 A JP 2009525396A JP 5327050 B2 JP5327050 B2 JP 5327050B2
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- Prior art keywords
- metal
- polishing
- acid
- functional group
- water
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- 238000000034 method Methods 0.000 title claims description 36
- 125000000524 functional group Chemical group 0.000 claims abstract description 158
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- 125000000129 anionic group Chemical group 0.000 claims abstract description 66
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 11
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- 239000002245 particle Substances 0.000 claims description 34
- -1 nitrogen-containing cyclic compound Chemical class 0.000 claims description 29
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- 229910052802 copper Inorganic materials 0.000 claims description 27
- 239000010949 copper Substances 0.000 claims description 27
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 25
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical group OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 24
- 125000002843 carboxylic acid group Chemical group 0.000 claims description 24
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 24
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- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 12
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- 125000003545 alkoxy group Chemical group 0.000 claims description 8
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 claims description 8
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- BJEPYKJPYRNKOW-UHFFFAOYSA-N alpha-hydroxysuccinic acid Natural products OC(=O)C(O)CC(O)=O BJEPYKJPYRNKOW-UHFFFAOYSA-N 0.000 claims description 6
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- 150000003951 lactams Chemical group 0.000 claims description 6
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- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 claims description 4
- WHUUTDBJXJRKMK-UHFFFAOYSA-N Glutamic acid Natural products OC(=O)C(N)CCC(O)=O WHUUTDBJXJRKMK-UHFFFAOYSA-N 0.000 claims description 4
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- 125000003827 glycol group Chemical group 0.000 claims description 4
- 235000011167 hydrochloric acid Nutrition 0.000 claims description 4
- 239000004310 lactic acid Substances 0.000 claims description 4
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- 239000010937 tungsten Substances 0.000 claims description 4
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- KJTLSVCANCCWHF-UHFFFAOYSA-N Ruthenium Chemical compound [Ru] KJTLSVCANCCWHF-UHFFFAOYSA-N 0.000 claims description 3
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Images
Classifications
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- 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
- C23F3/00—Brightening metals by chemical means
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- 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]
-
- 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
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- 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
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Description
ジメチルアミン、トリメチルアミン、トリエチルアミン、プロピレンジアミン等のアルキルアミン;
エチレンジアミンテトラ四酢酸(EDTA)、ジエチルジチオカルバミン酸ナトリウム、キトサン等のアミン類;
ジチゾン、クプロイン(2,2’−ビキノリン)、ネオクプロイン(2,9−ジメチル−1,10−フェナントロリン)、バソクプロイン(2,9−ジメチル−4,7−ジフェニル−1,10−フェナントロリン)、キュペラゾン(ビスシクロヘキサノンオキサリルヒドラゾン)等のイミン類;
ベンズイミダゾール−2−チオ−ル、トリアジンジチオール、トリアジントリチオール、2−[2−(ベンゾチアゾリル)]チオプロピオン酸、2−[2−(ベンゾチアゾリル)]チオブチル酸、2−メルカプトベンゾチアゾール、1,2,3−トリアゾール、1,2,4−トリアゾール、3−アミノ−1H−1,2,4−トリアゾール、ベンゾトリアゾール、1−ヒドロキシベンゾトリアゾール、1−ジヒドロキシプロピルベンゾトリアゾール、2,3−ジカルボキシプロピルベンゾトリアゾール、4−ヒドロキシベンゾトリアゾール、4−カルボキシル−1H−ベンゾトリアゾール、4−カルボキシル−1H−ベンゾトリアゾールメチルエステル、4−カルボキシル−1H−ベンゾトリアゾールブチルエステル、4−カルボキシル−1H−ベンゾトリアゾールオクチルエステル、5−ヘキシルベンゾトリアゾール、N−(1,2,3−ベンゾトリアゾリル−1−メチル)−N−(1,2,4−トリアゾリル−1−メチル)−2−エチルヘキシルアミン、トリルトリアゾール、ナフトトリアゾール、ビス[(1−ベンゾトリアゾリル)メチル]ホスホン酸等のアゾール類等の含窒素環状化合物;
ノニルメルカプタン、ドデシルメルカプタン等のメルカプタン類;並びに
デシルベンゼンスルホン酸、ドデシル硫酸等のイオン性界面活性剤及びその塩等が挙げられる。
検出器:株式会社日立製作所製、L−3300型 R1検出器
カラム:株式会社日立製作所製、Gelpack GL−W500
カラムサイズ:10.7mm(φ)×300mm
溶離液:100mMリン酸緩衝液(pH=6.8)/アセトニトリル=90/10(Vol%)
液送圧力:17kgf/cm2
溶離液流量:1.0ml/分
測定サンプル量:50μl
検量線:ポリエチレングリコール/ポリエチレンオキシド
本発明における水溶性ポリマは、これまで説明したとおりアニオン性官能基及びノニオン性官能基を有するものであるが、前記アニオン性官能基としては、スルホン酸基、カルボン酸基、リン酸基及びそれらの塩から選ばれる少なくとも1種であることが好ましい。これらの中でも、カルボン酸基又はその塩がより好ましい。
実施例1〜9及び比較例1〜8で用いた各水溶性ポリマ(a)〜(k)は、表1に示すアニオン性官能基を有するモノマ及びノニオン性官能基を有するモノマを重合して得た水溶性ポリマである。官能基の種類、水溶性ポリマの全官能基数に対する、アニオン性官能基数とノニオン性官能基数(百分率)、及び重量平均分子量を表1に示す。
検出器:株式会社日立製作所製、L−3300型 R1検出器
カラム:株式会社日立製作所製、Gelpack GL−W500
カラムサイズ:10.7mm(φ)×300mm
溶離液:100mMリン酸緩衝液(pH=6.8)/アセトニトリル=90/10(V
ol%)
液送圧力:17kgf/cm2
溶離液流量:1.0ml/分
測定サンプル量:50μl
検量線:ポリエチレングリコール/ポリエチレンオキシド
(実施例1)
研磨液全質量に対して、濃度30質量%の過酸化水素水(試薬特級)を30質量%、リン酸を0.2質量%、ベンゾトリアゾールを0.2質量%、クエン酸を0.15質量%、1,2,4−トリアゾールを0.08質量%、表1に示す水溶性ポリマ(a)を0.2質量%、及び純水を加えて100質量%になるように配合し、濃度28〜30質量%のアンモニア水を添加してpH3に調整して、研磨液(A)を作製した。
水溶性ポリマ(a)に替えて水溶性ポリマ(b)を用いること以外は、実施例1と同様に操作して、研磨液(B)を作製した。
水溶性ポリマ(a)に替えて水溶性ポリマ(c)を用いること以外は、実施例1と同様に操作して、研磨液(C)を作製した。
水溶性ポリマ(a)に替えて水溶性ポリマ(d)を用いること以外は、実施例1と同様に操作して、研磨液(D)を作製した。
水溶性ポリマ(a)に替えて水溶性ポリマ(e)を用いること以外は、実施例1と同様に操作して、研磨液(E)を作製した。
水溶性ポリマ(a)に替えて水溶性ポリマ(f)を用いること以外は、実施例1と同様に操作して、研磨液(F)を作製した。
水溶性ポリマ(a)に替えて水溶性ポリマ(g)を用いること以外は、実施例1と同様に操作して、研磨液(G)を作製した。
水溶性ポリマ(a)に替えて水溶性ポリマ(b)を用い、pHを4に調整すること以外は、実施例1と同様に操作して、研磨液(H)を作製した。
研磨液全質量に対して、濃度30質量%の過酸化水素水(試薬特級)を30質量%、リン酸を0.2質量%、ベンゾトリアゾールを0.2質量%、クエン酸を0.15質量%、1,2,4−トリアゾールを0.08質量%、表1に示す水溶性ポリマ(b)を0.2質量%、メジアン径が60nmのコロイダルシリカ砥粒を0.05質量%、及び純水を加えて100質量%になるように配合し、濃度28〜30質量%のアンモニア水を添加してpH3に調整して、研磨液(I)を作製した。
水溶性ポリマ(a)に替えて水溶性ポリマ(h)を用いること以外は、実施例1と同様に操作して、研磨液(J)を作製した。
水溶性ポリマ(a)に替えて水溶性ポリマ(i)を用いること以外は、実施例1と同様に操作して、研磨液(K)を作製した。
水溶性ポリマ(a)に替えて水溶性ポリマ(h)を用い、pHを4に調整すること以外は、実施例1と同様に操作して、研磨液(L)を作製した。
水溶性ポリマ(a)に替えて水溶性ポリマ(h)を用い、pHを2に調整すること以外は、実施例1と同様に操作して、研磨液(M)を作製した。
水溶性ポリマ(b)に替えて水溶性ポリマ(h)を用いること以外は、実施例9と同様に操作して、研磨液(N)を作製した。
水溶性ポリマ(a)に替えて水溶性ポリマ(k)を用いること以外は、実施例1と同様に操作して、研磨液(O)を作製した。
pHを2に調整すること以外は、実施例1と同様に操作して、研磨液(P)を作製した。
pHを6に調整すること以外は、実施例1と同様に操作して、研磨液(Q)を作製した。
基体(I):パターン無しシリコン基板
シリコン基板表面に、二酸化ケイ素絶縁膜層を作製し、スパッタ法により15nmのTaN膜、10nmのTa膜、100nmの銅膜を形成した後、電解メッキ法により1.5μmの銅を堆積した被研磨用基板を用いた。
シリコン基板表面に、二酸化ケイ素絶縁膜層を成膜し、SEMATECH854マスクパターンで二酸化ケイ素絶縁膜層に配線溝を形成した後、スパッタ法により15nmのTaN膜、10nmのTa膜、100nmの銅膜を形成し、電解メッキ法により1.1μmの銅を堆積した被研磨用基板を用いた。なお、配線溝の深さは500nmである。このパターン付きシリコン基板をCMP又は電解研磨により銅膜の厚みが250nm、100μmの配線幅をもつ配線部の銅膜の段差が20nm以下となるまで研磨した。以上の前処理を行ったパターン付きシリコン基板を評価に用いた。
研磨装置:アプライドマテリアルズ社製MIRRA
研磨荷重:6.9kPa
研磨液供給量:200ml/分
研磨定盤回転数:93rpm
ウエハを装着したヘッド回転数:87rpm
(CMP後洗浄)
CMP処理後は、ポリビニルアルコール製ブラシ、超音波水による洗浄を行った後、スピンドライヤにて乾燥を行った。
(1)研磨摩擦力:研磨装置(アプライドマテリアルズ社製MIRRA)の研磨定盤を駆動させるモータの動作電流値をアナログ信号(電圧(V))として出力し、キーエンス社製型番NR−250で読み取り、この値の平均値を摩擦力として相対的に比較した。
Claims (13)
- 酸化金属溶解剤、金属の酸化剤、金属防食剤、水溶性ポリマ及び水を含有する金属用研磨液であって、
前記水溶性ポリマは、アニオン性官能基及びノニオン性官能基を有するポリマからなり、かつ、重量平均分子量が20,000以上であり、
pHが2.5以上5.0以下であり、
被研磨金属が、銅、銅合金、銅の酸化物及び銅合金の酸化物から選ばれる少なくとも1種である金属用研磨液。 - 前記アニオン性官能基及びノニオン性官能基を有する水溶性ポリマが、スルホン酸基、カルボン酸基、リン酸基及びそれらの塩から選ばれる少なくとも1種のアニオン性官能基を有する請求項1に記載の金属用研磨液。
- 前記アニオン性官能基及びノニオン性官能基を有する水溶性ポリマが、アルコール基、アミド基、アルコキシ基、グリコール基及びラクタム基から選ばれる少なくとも1種のノニオン性官能基を有する請求項1又は2に記載の金属用研磨液。
- 前記アニオン性官能基及びノニオン性官能基を有する水溶性ポリマの全官能基数に対するノニオン性官能基数の割合が5%以上60%以下である請求項1〜3のいずれか一項に記載の金属用研磨液。
- 前記金属の酸化剤が、過酸化水素、過硫酸アンモニウム、硝酸、過ヨウ素酸カリウム、次亜塩素酸及びオゾン水から選ばれる少なくとも1種である請求項1〜4のいずれか一項に記載の金属用研磨液。
- 前記酸化金属溶解剤が、25℃における第一段の酸解離指数が3.7未満である無機酸、有機酸及びそれらの塩から選ばれる少なくとも1種である請求項1〜5のいずれか一項に記載の金属用研磨液。
- 前記酸化金属溶解剤が、マロン酸、クエン酸、リンゴ酸、グリコール酸、グルタミン酸、シュウ酸、酒石酸、硫酸、硝酸、燐酸、塩酸、ギ酸、乳酸、フタル酸、フマル酸、マレイン酸、アミノ酢酸、アミド硫酸及びそれらの塩から選ばれる少なくとも1種である請求項1〜6のいずれか一項に記載の金属用研磨液。
- 前記金属防食剤が、含窒素環状化合物及びイオン性界面活性剤から選ばれる少なくとも1種である請求項1〜7のいずれか一項に記載の金属用研磨液。
- 研磨粒子を含有する請求項1〜8のいずれか一項に記載の金属用研磨液。
- 前記研磨粒子が、シリカ、アルミナ、セリア、チタニア、ジルコニア、ゲルマニア及び有機ポリマから選ばれる少なくとも1種である請求項1〜9のいずれか一項に記載の金属用研磨液。
- 被研磨金属が、タンタル、タンタル化合物、チタン、チタン化合物、タングステン、タングステン化合物、ルテニウム及びルテニウム化合物から選ばれる少なくとも1種である請求項1〜10のいずれか一項に記載の金属用研磨液。
- 前記水溶性ポリマの重量平均分子量が40,000以上である請求項1に記載の金属用研磨液。
- 研磨定盤の研磨布上に請求項1〜12のいずれか一項に記載の金属用研磨液を供給しながら、被研磨金属膜を有する基板を研磨布に押圧した状態で研磨定盤と基板を相対的に動かして被研磨金属膜を研磨する被研磨膜の研磨方法。
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Also Published As
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US8288282B2 (en) | 2012-10-16 |
JPWO2009017095A1 (ja) | 2010-10-21 |
KR101472617B1 (ko) | 2014-12-15 |
KR20100065304A (ko) | 2010-06-16 |
TW200916608A (en) | 2009-04-16 |
US20100197201A1 (en) | 2010-08-05 |
WO2009017095A1 (ja) | 2009-02-05 |
TWI382106B (zh) | 2013-01-11 |
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