JP5573234B2 - Cmp研磨液及びこのcmp研磨液を用いた基板の研磨方法 - Google Patents
Cmp研磨液及びこのcmp研磨液を用いた基板の研磨方法 Download PDFInfo
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- JP5573234B2 JP5573234B2 JP2010046742A JP2010046742A JP5573234B2 JP 5573234 B2 JP5573234 B2 JP 5573234B2 JP 2010046742 A JP2010046742 A JP 2010046742A JP 2010046742 A JP2010046742 A JP 2010046742A JP 5573234 B2 JP5573234 B2 JP 5573234B2
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- polishing
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- polishing liquid
- cmp
- acid
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- ATBAMAFKBVZNFJ-UHFFFAOYSA-N beryllium atom Chemical compound [Be] ATBAMAFKBVZNFJ-UHFFFAOYSA-N 0.000 description 1
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- 229910052792 caesium Inorganic materials 0.000 description 1
- TVFDJXOCXUVLDH-UHFFFAOYSA-N caesium atom Chemical compound [Cs] TVFDJXOCXUVLDH-UHFFFAOYSA-N 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 238000011088 calibration curve Methods 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 239000001768 carboxy methyl cellulose Substances 0.000 description 1
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 1
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
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- 239000002131 composite material Substances 0.000 description 1
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- 230000007797 corrosion Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 235000019316 curdlan Nutrition 0.000 description 1
- 229940078035 curdlan Drugs 0.000 description 1
- 150000001923 cyclic compounds Chemical class 0.000 description 1
- AZSFNUJOCKMOGB-UHFFFAOYSA-N cyclotriphosphoric acid Chemical compound OP1(=O)OP(O)(=O)OP(O)(=O)O1 AZSFNUJOCKMOGB-UHFFFAOYSA-N 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- ZJIPHXXDPROMEF-UHFFFAOYSA-N dihydroxyphosphanyl dihydrogen phosphite Chemical compound OP(O)OP(O)O ZJIPHXXDPROMEF-UHFFFAOYSA-N 0.000 description 1
- 125000005594 diketone group Chemical group 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- WNAHIZMDSQCWRP-UHFFFAOYSA-N dodecane-1-thiol Chemical compound CCCCCCCCCCCCS WNAHIZMDSQCWRP-UHFFFAOYSA-N 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 239000003480 eluent Substances 0.000 description 1
- LYCAIKOWRPUZTN-UHFFFAOYSA-N ethylene glycol Natural products OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 238000013467 fragmentation Methods 0.000 description 1
- 238000006062 fragmentation reaction Methods 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 229910052733 gallium Inorganic materials 0.000 description 1
- 239000008103 glucose Substances 0.000 description 1
- 235000013922 glutamic acid Nutrition 0.000 description 1
- 239000004220 glutamic acid Substances 0.000 description 1
- 159000000011 group IA salts Chemical class 0.000 description 1
- PKWIYNIDEDLDCJ-UHFFFAOYSA-N guanazole Chemical compound NC1=NNC(N)=N1 PKWIYNIDEDLDCJ-UHFFFAOYSA-N 0.000 description 1
- 229920001519 homopolymer Polymers 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- TVZISJTYELEYPI-UHFFFAOYSA-N hypodiphosphoric acid Chemical compound OP(O)(=O)P(O)(O)=O TVZISJTYELEYPI-UHFFFAOYSA-N 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 150000007522 mineralic acids Chemical class 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 150000002816 nickel compounds Chemical class 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- ZVEZMVFBMOOHAT-UHFFFAOYSA-N nonane-1-thiol Chemical compound CCCCCCCCCS ZVEZMVFBMOOHAT-UHFFFAOYSA-N 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 235000005985 organic acids Nutrition 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 150000002941 palladium compounds Chemical class 0.000 description 1
- LCLHHZYHLXDRQG-ZNKJPWOQSA-N pectic acid Chemical compound O[C@@H]1[C@@H](O)[C@@H](O)O[C@H](C(O)=O)[C@@H]1OC1[C@H](O)[C@@H](O)[C@@H](OC2[C@@H]([C@@H](O)[C@@H](O)[C@H](O2)C(O)=O)O)[C@@H](C(O)=O)O1 LCLHHZYHLXDRQG-ZNKJPWOQSA-N 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- ACVYVLVWPXVTIT-UHFFFAOYSA-N phosphinic acid Chemical compound O[PH2]=O ACVYVLVWPXVTIT-UHFFFAOYSA-N 0.000 description 1
- 108010064470 polyaspartate Proteins 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 239000010318 polygalacturonic acid Substances 0.000 description 1
- 229920002643 polyglutamic acid Polymers 0.000 description 1
- 229920000656 polylysine Polymers 0.000 description 1
- 229920001444 polymaleic acid Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229920005749 polyurethane resin Polymers 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- LOAUVZALPPNFOQ-UHFFFAOYSA-N quinaldic acid Chemical compound C1=CC=CC2=NC(C(=O)O)=CC=C21 LOAUVZALPPNFOQ-UHFFFAOYSA-N 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 229910052701 rubidium Inorganic materials 0.000 description 1
- IGLNJRXAVVLDKE-UHFFFAOYSA-N rubidium atom Chemical compound [Rb] IGLNJRXAVVLDKE-UHFFFAOYSA-N 0.000 description 1
- DCKVNWZUADLDEH-UHFFFAOYSA-N sec-butyl acetate Chemical compound CCC(C)OC(C)=O DCKVNWZUADLDEH-UHFFFAOYSA-N 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 1
- 125000001424 substituent group Chemical group 0.000 description 1
- 150000003464 sulfur compounds Chemical class 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
- 150000003482 tantalum compounds Chemical class 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
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- 150000003536 tetrazoles Chemical class 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 150000003609 titanium compounds Chemical class 0.000 description 1
- CDMIYIVDILNBIJ-UHFFFAOYSA-N triazinane-4,5,6-trithione Chemical compound SC1=NN=NC(S)=C1S CDMIYIVDILNBIJ-UHFFFAOYSA-N 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 150000003658 tungsten compounds Chemical class 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- GPPXJZIENCGNKB-UHFFFAOYSA-N vanadium Chemical compound [V]#[V] GPPXJZIENCGNKB-UHFFFAOYSA-N 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
Images
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- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
- Mechanical Treatment Of Semiconductor (AREA)
Description
[一般式(1)中、R1は、水酸基で置換されていてもよい炭素数1〜2のアルキル基、又は、水素原子を示す。]
CMP研磨液は、下記一般式(1)で表されるα−アミノ酸を含有する。一般式(1)中のR1は、水酸基で置換されていてもよいメチル基、又は、水素原子が好ましく、水素原子がより好ましい。α−アミノ酸としては、グリシン、アラニン、セリン等が挙げられる。
[一般式(1)中、R1は、水酸基で置換されていてもよい炭素数1〜2のアルキル基、又は、水素原子を示す。]
CMP研磨液は、リン酸類を含有する。リン酸類は、後述する酸化剤によって酸化された金属を、溶解及び/又は錯化することによって金属膜の研磨を促進すると考えられ、パラジウムに対する酸化金属溶解剤としての機能を有するものと推定される。
CMP研磨液に含まれる酸化剤は、層形成用等として基板に用いられる金属に対する酸化剤である。酸化剤としては、過酸化水素(H2O2)、過ヨウ素酸、過ヨウ素酸塩、ヨウ素酸塩、臭素酸塩、過硫酸塩等が好ましく、その中でも過酸化水素が特に好ましい。これらは、1種類単独で、又は2種類以上混合して用いることができる。
砥粒としては、具体的には、アルミナ(ヒュームドアルミナ、遷移アルミナ)、シリカ(ヒュームドシリカ、コロイダルシリカ)、ジルコニア、チタニア、セリア等を挙げることができ、中でもヒュームドアルミナ、遷移アルミナ、ヒュームドシリカ、コロイダルシリカが好ましく、研磨速度を高速に保ちながら研磨傷を抑制できる点で、コロイダルシリカがさらに好ましい。
CMP研磨液に、金属防食剤をさらに添加することもできる。金属防食剤は、金属層のエッチングを抑止し、ディッシング特性を向上させる化合物である。
CMP研磨液には、研磨後の平坦性を向上できる点で、水溶性ポリマを添加することができる。上記の観点では、水溶性ポリマの重量平均分子量としては、500以上とすることが好ましく、1500以上とすることがより好ましく、5000以上とすることが特に好ましい。重量平均分子量の上限は、特に規定するものではないが、溶解性の観点から、500万以下が好ましい。重量平均分子量が、500未満では高い研磨速度が発現しない傾向にある。
使用機器:日立L−6000型〔株式会社日立製作所製〕
カラム:ゲルパックGL−R420+ゲルパックGL−R430+ゲルパックGL−R440〔日立化成工業株式会社 商品名、計3本〕
溶離液:テトラヒドロフラン
測定温度:40℃
流量:1.75ml/min.
検出器:L−3300RI〔株式会社日立製作所製〕
CMP研磨液のpHは、パラジウム層のCMP研磨速度が大きくなるという観点から、1〜12であることが好ましい。pHが1以上、またはpHが6以下であれば、所定のCMPによる研磨速度が確保できる傾向があり、実用的な研磨液となりうる。pHは、1〜5であることがより好ましく、1〜4であることが特に好ましい。
以上説明したCMP研磨液を用いることで、基板の研磨が可能となる。すなわち、パラジウム層を有する基板と研磨布の間に、α−アミノ酸、リン酸類、酸化剤及び砥粒を少なくとも含有するCMP研磨液を供給しながら、基板を研磨布で研磨する、基板の研磨方法が提供される。
実施例1〜4及び比較例1〜11で用いるCMP研磨液は、研磨液全質量に対して、二次粒子径42nmのコロイダルシリカを2〜10質量%、30%過酸化水素水を10質量%、表1に示す酸化金属溶解剤を1〜5質量%、表1に示すα−アミノ酸を0〜1質量%、残部に純水を含有して調製した。これらの金属用研磨液を用いて下記の研磨条件で被研磨基板の研磨を行った。
測定温度:25±5℃
pH:電気化学計器株式会社製、型番PHL−40で測定した。
研磨装置:卓上ラッピング装置(株式会社ナノファクター製)
研磨液流量:11mL/分
基体:厚さ0.3μmのパラジウム膜をスパッタ法で形成したシリコン基板。
研磨パッド:独立気泡を持つ発泡ポリウレタン樹脂(ローム・アンド・ハース・ジャパン株式会社製、型番IC1000)
研磨圧力:29.4kPa
基体と研磨定盤との相対速度:25m/分
研磨液の供給量:11mL/分
研磨時間:1分
洗浄:研磨後ウエハを流水で良く洗浄後、水滴を除去し、乾燥させた。
研磨速度:上記条件で研磨及び洗浄したパラジウム膜の研磨速度を研磨前後での膜厚差を電気抵抗値から換算して求めた。
実施例1〜4及び比較例1〜11におけるパラジウム研磨速度(PdRR)を表1に示す。
実施例5〜11で用いるCMP研磨液は、研磨液全質量に対して、二次粒子径42nmのコロイダルシリカを0.5〜10質量%、30%過酸化水素水を10質量%、リン酸を1〜3質量%、表2に示すα−アミノ酸を0.5〜5質量%、残部に純水を含有して調製した。比較例12で用いるCMP研磨液は、砥粒を含まないこと以外を実施例1と同様にした研磨液であり、比較例13で用いるCMP研磨液は、α−アミノ酸を含まないこと以外を実施例1と同様にした研磨液である。これらの金属用研磨液を用いて上記と同様の研磨条件で被研磨基板の研磨を行った。
Claims (8)
- 前記酸化剤が、過酸化水素、過ヨウ素酸、過ヨウ素酸塩、ヨウ素酸塩、臭素酸塩及び過硫酸塩からなる群より選択される少なくとも一種である、請求項1に記載のCMP研磨液。
- 前記砥粒が、アルミナ、シリカ、ジルコニア、チタニア及びセリアからなる群より選択される少なくとも一種である、請求項1又は2に記載のCMP研磨液。
- 前記砥粒の含有量が、CMP研磨液全量基準で0.1〜10質量%である、請求項1〜3のいずれか一項に記載のCMP研磨液。
- 前記酸化剤が、過酸化水素、過ヨウ素酸、過ヨウ素酸塩、ヨウ素酸塩、臭素酸塩及び過硫酸塩からなる群より選択される少なくとも一種である、請求項5に記載の研磨方法。
- 前記砥粒が、アルミナ、シリカ、ジルコニア、チタニア及びセリアからなる群より選択される少なくとも一種である、請求項5又は6に記載の研磨方法。
- 前記砥粒の含有量が、CMP研磨液全量基準で0.1〜10質量%である、請求項5〜7のいずれか一項に記載の研磨方法。
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Free format text: JAPANESE INTERMEDIATE CODE: R350 |