JP5277640B2 - 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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- JP5277640B2 JP5277640B2 JP2008004305A JP2008004305A JP5277640B2 JP 5277640 B2 JP5277640 B2 JP 5277640B2 JP 2008004305 A JP2008004305 A JP 2008004305A JP 2008004305 A JP2008004305 A JP 2008004305A JP 5277640 B2 JP5277640 B2 JP 5277640B2
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- Prior art keywords
- polishing
- cmp
- copper
- metal
- weight
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- 238000000034 method Methods 0.000 title claims abstract description 43
- 239000007788 liquid Substances 0.000 title claims description 103
- 229910052751 metal Inorganic materials 0.000 claims abstract description 104
- 239000002184 metal Substances 0.000 claims abstract description 104
- 239000000758 substrate Substances 0.000 claims abstract description 73
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 58
- 229910052802 copper Inorganic materials 0.000 claims abstract description 58
- 239000010949 copper Substances 0.000 claims abstract description 58
- 150000004699 copper complex Chemical class 0.000 claims abstract description 32
- 238000005530 etching Methods 0.000 claims abstract description 26
- 230000003068 static effect Effects 0.000 claims abstract description 19
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000010703 silicon Substances 0.000 claims abstract description 18
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 18
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical compound [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 claims abstract description 11
- 238000007747 plating Methods 0.000 claims abstract description 8
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- 239000002002 slurry Substances 0.000 claims description 42
- 239000011229 interlayer Substances 0.000 claims description 40
- 239000004020 conductor Substances 0.000 claims description 28
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 26
- 238000005260 corrosion Methods 0.000 claims description 24
- 230000007797 corrosion Effects 0.000 claims description 24
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- -1 organic acid ester Chemical class 0.000 claims description 10
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 8
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 8
- YBMRDBCBODYGJE-UHFFFAOYSA-N germanium dioxide Chemical compound O=[Ge]=O YBMRDBCBODYGJE-UHFFFAOYSA-N 0.000 claims description 8
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- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 claims description 5
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- CETPSERCERDGAM-UHFFFAOYSA-N ceric oxide Chemical compound O=[Ce]=O CETPSERCERDGAM-UHFFFAOYSA-N 0.000 claims description 4
- 229910000422 cerium(IV) oxide Inorganic materials 0.000 claims description 4
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- ULRPISSMEBPJLN-UHFFFAOYSA-N 2h-tetrazol-5-amine Chemical compound NC1=NN=NN1 ULRPISSMEBPJLN-UHFFFAOYSA-N 0.000 claims description 3
- KJTLSVCANCCWHF-UHFFFAOYSA-N Ruthenium Chemical compound [Ru] KJTLSVCANCCWHF-UHFFFAOYSA-N 0.000 claims description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 3
- 150000001408 amides Chemical class 0.000 claims description 3
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- HXJUTPCZVOIRIF-UHFFFAOYSA-N sulfolane Chemical class O=S1(=O)CCCC1 HXJUTPCZVOIRIF-UHFFFAOYSA-N 0.000 claims description 3
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- JAAIPIWKKXCNOC-UHFFFAOYSA-N 1h-tetrazol-1-ium-5-thiolate Chemical compound SC1=NN=NN1 JAAIPIWKKXCNOC-UHFFFAOYSA-N 0.000 claims 1
- 125000003006 2-dimethylaminoethyl group Chemical group [H]C([H])([H])N(C([H])([H])[H])C([H])([H])C([H])([H])* 0.000 claims 1
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- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 6
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- 238000009792 diffusion process Methods 0.000 description 1
- SBZXBUIDTXKZTM-UHFFFAOYSA-N diglyme Chemical compound COCCOCCOC SBZXBUIDTXKZTM-UHFFFAOYSA-N 0.000 description 1
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 description 1
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- DRIIOWCRDBYORK-UHFFFAOYSA-N ethane-1,2-diol;methyl acetate Chemical compound OCCO.COC(C)=O DRIIOWCRDBYORK-UHFFFAOYSA-N 0.000 description 1
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- 229940116333 ethyl lactate Drugs 0.000 description 1
- JBTWLSYIZRCDFO-UHFFFAOYSA-N ethyl methyl carbonate Chemical compound CCOC(=O)OC JBTWLSYIZRCDFO-UHFFFAOYSA-N 0.000 description 1
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- 230000002349 favourable effect Effects 0.000 description 1
- 229940104869 fluorosilicate Drugs 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
- 238000005227 gel permeation chromatography Methods 0.000 description 1
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- 235000013905 glycine and its sodium salt Nutrition 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
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- 239000010931 gold Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- ZSIAUFGUXNUGDI-UHFFFAOYSA-N hexan-1-ol Chemical compound CCCCCCO ZSIAUFGUXNUGDI-UHFFFAOYSA-N 0.000 description 1
- 150000004678 hydrides Chemical class 0.000 description 1
- QOSATHPSBFQAML-UHFFFAOYSA-N hydrogen peroxide;hydrate Chemical compound O.OO QOSATHPSBFQAML-UHFFFAOYSA-N 0.000 description 1
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- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 1
- 239000011976 maleic acid Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- POPACFLNWGUDSR-UHFFFAOYSA-N methoxy(trimethyl)silane Chemical compound CO[Si](C)(C)C POPACFLNWGUDSR-UHFFFAOYSA-N 0.000 description 1
- BFXIKLCIZHOAAZ-UHFFFAOYSA-N methyltrimethoxysilane Chemical compound CO[Si](C)(OC)OC BFXIKLCIZHOAAZ-UHFFFAOYSA-N 0.000 description 1
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- 239000011496 polyurethane foam Substances 0.000 description 1
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- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-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
(A)前記金属防食剤を0.2重量%含む液温40℃の研磨液100重量部中に、厚さ1600nmの銅膜をメッキ法で形成してなる20mm×20mmの大きさのシリコン基板を200回転/分の速さで回転させながら10分間浸漬したときの銅膜に対する静的エッチング速度が100Å/分未満であり、
(B)前記金属防食剤を0.2重量%含む液温25℃の研磨液100重量部中に、前記金属防食剤のモル濃度に対して半分の硫酸銅(II)を添加した際に形成される銅錯体の液温25℃の研磨液への溶解度が0.3重量%以上である、前記(A)及び(B)の条件を満たす金属防食剤を含有してなるCMP用研磨液に関する。
前記第1の研磨工程で露出したバリア層を前記(1)〜(14)のいずれか一項に記載のCMP用研磨液を用いて研磨して前記凸部の層間絶縁膜を露出させる第2の研磨工程とを含むことを特徴とする研磨方法に関する。
(A)前記金属防食剤を0.2重量%含む液温40℃の研磨液100重量部中に、厚さ1600nmの銅膜をメッキ法で形成してなる20mm×20mmの大きさのシリコン基板を200回転/分の速さで回転させながら10分間浸漬したときの銅膜に対する静的エッチング速度が100Å/分未満であり、
(B)前記金属防食剤を0.2重量%含む液温25℃の研磨液100重量部中に、前記金属防食剤のモル濃度に対して半分の硫酸銅(II)を添加した際に形成される銅錯体の液温25℃の研磨液への溶解度が0.3重量%以上である、前記(A)及び(B)の条件を満たす金属防食剤を含有してなるCMP用研磨液である。
本発明における銅錯体の液温25℃の研磨液への溶解度は、金属防食剤を0.2重量%含む液温25℃の研磨液100重量部中に、前記金属防食剤のモル濃度に対して半分の硫酸銅(II)を添加して銅錯体を生成させ、研磨液の液温を25℃に保ち、静置後の銅錯体沈澱物の有無により銅錯体の研磨液への溶解度を算定する。前記硫酸銅(II)の添加量は、金属防食剤と銅(II)イオンが2対1のモル比で銅錯体を形成すると仮定したことに基く。
[CMP用研磨液(I)の作製]
5−メチルテトラゾール0.2重量部、平均粒径70nmのコロイダルシリカ4.0重量部、プロピレングリコールモノプロピルエーテル2.0重量部、リンゴ酸0.5重量部、30%過酸化水素水0.2重量部、ポリメタクリル酸(重量平均分子量8000)0.1重量部、水93.0重量部を攪拌・混合し、CMP用研磨液(I)を作製した。
液温40℃のCMP用研磨液(I)100重量部中に、厚さ1600nmの銅膜をメッキ法で形成してなる20mm×20mmの大きさのシリコン基板を200回転/分の速さで回転させながら10分間浸漬した。シリコン基板の回転は、撹拌棒の先端にシリコン基板の裏面を固定し、それを研磨液中に浸漬して撹拌棒を200回転/分の速さで回転させることにより行なった。
抵抗率測定器(RT−70/RG−7B、NAPSON CORPORATION製)を用いて測定した電気抵抗値から銅膜厚を換算し、その浸漬前後の銅膜の膜厚差より銅膜に対する静的エッチング速度を算出した。その結果、CMP用研磨液(I)の銅膜に対する静的エッチング速度は15Å/分であった。
液温25℃のCMP用研磨液(I)1000重量部に硫酸銅(II)1.90重量部を加え、よく撹拌した後、液温を25℃に保ち12時間静置したが、この液に沈殿物はみられなかった。ここで、生成される銅と5−メチルテトラゾールとの錯体は約2.8重量部と推定される。
[CMP用研磨液(II)〜(VIII)の作製]
表1に示す各成分を混合し、実施例1と同様に操作してCMP用研磨液(II)〜(VIII)を作製し、銅膜に対する静的エッチング速度及び銅錯体の溶解度の測定を行なった。結果を表1に示す。
[CMP用研磨液(IX)の作製]
ベンゾトリアゾール0.2重量部、平均粒径70nmのコロイダルシリカ4.0重量部、イソプロピルアルコール3.0重量部、リンゴ酸0.5重量部、30%過酸化水素水0.2重量部、ポリメタクリル酸(重量平均分子量8000)0.1重量部、水92.0重量部を攪拌・混合し、CMP用研磨液(IX)を作製した。
液温25℃のCMP用研磨液(IX)1000重量部に硫酸銅(II)1.34重量部を加え、よく撹拌した後、液温を25℃に保ち、12時間静置すると銅とベンゾトリアゾールの錯体と考えられる緑色の沈殿物がみられた。ここで、生成される銅とベンゾトリアゾールとの錯体は約2.5重量部と推定される。よってCMP用研磨液(IX)において、硫酸銅(II)を添加した際に生成される銅錯体の液温25℃の研磨液への溶解度が0.3重量%未満であることがわかった。
[CMP用研磨液(X)〜(XIV)の作製]
表2に示す各成分を混合し、比較例1と同様に操作してCMP用研磨液(X)〜(XVI)を作製し、銅膜に対する静的エッチング速度及び銅錯体の溶解度の測定を行なった。結果を表2に示す。
以下の項目により、CMP用研磨液(I)〜(XIV)の評価を行なった。(パターン基板の作製)
銅配線付きパターン基板(ATDF製854CMPパターン:二酸化ケイ素からなる厚さ500nmの層間絶縁膜)の溝部以外の銅膜を、銅膜用研磨液を用いて公知のCMP法により研磨して凸部のバリア層を被研磨面に露出させた。このパターン基板を下記の研磨に使用した。なお、前記パターン基板のバリア層は厚さ250Åの窒化タンタル膜からなっていた。
研磨装置:片面金属膜用研磨機(アプライドマテリアルズ社製、MIRRA)
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:93回/分
ヘッド回転数:87回/分
研磨圧力:14kPa
研磨液の供給量:200ml/分
(基板の研磨工程)
上記パターン基板をCMP用研磨液(I)〜(XIV)で、上記研磨条件で60秒間化学機械研磨した。これは、第2の研磨工程に相当し、20秒で凸部の層間絶縁膜は全て被研磨面に露出し、残りの40秒は、凸部ではこの露出した層間絶縁膜を研磨した。
上記で研磨したパターン基板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、蒸留水を基板に供給しながら基板とスポンジブラシを回転させ、60秒間洗浄した。次にスポンジブラシを取り除き、基板の被研磨面に蒸留水を60秒間供給した。最後に基板を高速で回転させることで蒸留水を弾き飛ばして基板を乾燥した。
上記で洗浄したパターン基板について、下記(1)及び(2)に示す評価を行い、その結果を表1及び表2に示す。
◎:腐食がなく良好である。
◎:1cm2当たりの有機残渣数が0.5個未満である。
Claims (18)
- 5−メチルテトラゾール、5−アミノテトラゾール、及び1−(2−ジメチルアミノエチル)−5−メルカプトテトラゾールからなる群から選ばれる少なくとも1種の金属防食剤を含有してなり、下記(A)及び(B)を満たすCMP用研磨液。
(A)液温40℃の前記研磨液100重量部中に、厚さ1600nmの銅膜をメッキ法で形成してなる20mm×20mmの大きさのシリコン基板を200回転/分の速さで回転させながら10分間浸漬したときの銅膜に対する静的エッチング速度が100Å/分未満であり、
(B)液温25℃の前記研磨液100重量部中に、前記金属防食剤のモル濃度に対して半分の硫酸銅(II)を添加した際に形成される銅錯体の液温25℃の研磨液への溶解度が0.3重量%以上である。 - 前記金属防食剤の含有量が、CMP用研磨液100重量部に対して0.001〜10重量部である請求項1記載のCMP用研磨液。
- 砥粒を含有してなる請求項1又は2記載のCMP用研磨液。
- 前記砥粒が、シリカ、アルミナ、セリア、チタニア、ジルコニア、ゲルマニア又はこれらの変性物から選ばれる少なくとも1種である請求項3記載のCMP用研磨液。
- 酸化金属溶解剤を含有してなる請求項1〜4のいずれか一項に記載のCMP用研磨液。
- 前記酸化金属溶解剤が、有機酸、有機酸エステル、有機酸のアンモニウム塩、無機酸及び無機酸のアンモニウム塩から選ばれる少なくとも1種である請求項5記載のCMP用研磨液。
- 金属の酸化剤を含有してなる請求項1〜6のいずれか一項に記載のCMP用研磨液。
- 前記金属の酸化剤が、過酸化水素、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7記載のCMP用研磨液。
- 水溶性ポリマーを含有してなる請求項1〜8のいずれか一項に記載のCMP用研磨液。
- 前記水溶性ポリマーが、ポリカルボン酸、ポリカルボン酸の塩、多糖類及びビニル系ポリマーから選ばれる少なくとも1種である請求項9記載のCMP用研磨液。
- 有機溶媒を含有してなる請求項1〜10のいずれか一項に記載のCMP用研磨液。
- 前記有機溶媒が、グリコール類、エーテル類、アルコール類、エステル類、ケトン類、フェノール類、アミド類、スルホラン類から選ばれる少なくとも1種である請求項11記載のCMP用研磨液。
- 基板上に形成された金属配線部の配線幅が10μm以下、配線間隔が配線幅の5倍以上である孤立微細金属配線用の研磨に用いる請求項1〜12のいずれか一項に記載のCMP用研磨液。
- 表面が凹部及び凸部からなる層間絶縁膜と、前記層間絶縁膜を表面に沿って被覆するバリア層と、前記凹部を充填してバリア層を被覆する導電性物質層とを有する基板の導電性物質層を研磨して前記凸部のバリア層を露出させる第1の研磨工程と、
前記第1の研磨工程で露出したバリア層を請求項1〜13のいずれか一項に記載のCMP用研磨液を用いて研磨して前記凸部の層間絶縁膜を露出させる第2の研磨工程とを含むことを特徴とする研磨方法。 - 前記導電性物質層の配線幅が10μm以下、配線間隔が配線幅の5倍以上である請求項14記載の研磨方法。
- 前記層間絶縁膜が、シリコン系被膜又は有機ポリマー膜である請求項14又は15記載の研磨方法。
- 前記導電性物質が、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種である請求項14〜16のいずれか一項に記載の研磨方法。
- 前記バリア層が、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種を含む請求項14〜17のいずれか一項に記載の研磨方法。
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