JP5510575B2 - 研磨液及びこの研磨液を用いた基板の研磨方法 - Google Patents
研磨液及びこの研磨液を用いた基板の研磨方法 Download PDFInfo
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- JP5510575B2 JP5510575B2 JP2013037142A JP2013037142A JP5510575B2 JP 5510575 B2 JP5510575 B2 JP 5510575B2 JP 2013037142 A JP2013037142 A JP 2013037142A JP 2013037142 A JP2013037142 A JP 2013037142A JP 5510575 B2 JP5510575 B2 JP 5510575B2
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
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- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
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- H01L21/31051—Planarisation of the insulating layers
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- H01L21/31055—Planarisation of the insulating layers involving a dielectric removal step the removal being a chemical etching step, e.g. dry etching
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- 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
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- H01L21/31051—Planarisation of the insulating layers
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Description
本実施形態に係る研磨液は、酸化セリウム粒子と、分散剤と、有機酸と、高分子化合物Bと、水とを含有するCMP用の研磨液である。以下、本実施形態に係る研磨液に含まれる各成分について詳細に説明する。
酸化セリウム粒子としては、特に制限はなく、公知のものを使用することができる。一般に酸化セリウムは、炭酸塩、硝酸塩、硫酸塩、しゅう酸塩等のセリウム化合物を酸化することによって得られる。酸化セリウム粒子を作製する方法としては、焼成、過酸化水素等による酸化法等が挙げられる。
本実施形態に係る研磨液は、有機酸としてパラトルエンスルホン酸(及び/又はその塩)を含有する。これにより、研磨速度を向上させ、かつ研磨終了後の被研磨膜(例えば、酸化珪素膜)の平坦性を向上させることができる。より詳細には、凹凸を有する被研磨面を研磨した場合に、研磨時間を短縮できることに加え、一部が過剰に研磨されて皿のように凹む現象、いわゆるディッシング(Dishing)が生じることを抑制することができる。この効果は、パラトルエンスルホン酸(及び/又はその塩)と、酸化セリウム粒子とを併用することにより、より効率的に得られる。
本実施形態に係る研磨液は、カルボン酸基又はカルボン酸塩基を有する高分子化合物Bを含む。ここで、カルボン酸基とは、−COOHで表される官能基であり、カルボン酸塩基とは、−COOXで表される官能基である(Xは塩基由来の陽イオンであり、例えば、アンモニウムイオン、ナトリウムイオン及びカリウムイオンが挙げられる)。特に、高分子化合物Bとしてカルボン酸基又はカルボン酸塩基を有する水溶性有機高分子及び/又はその塩を含有することが好ましい。これにより、研磨終了後の被研磨膜(例えば、酸化珪素膜)の平坦性を向上させることができる。より詳細には、凹凸を有する被研磨面を研磨した場合に、一部が過剰に研磨されて皿のように凹む現象、いわゆるディッシングが生じることを抑制することができる。この効果は、カルボン酸基又はカルボン酸塩基を有する水溶性有機高分子及び/又はその塩と、パラトルエンスルホン酸(及び/又はその塩)と、酸化セリウム粒子とを併用することにより、より効率的に得られる。
ポリアスパラギン酸、ポリグルタミン酸、ポリリシン、ポリリンゴ酸、ポリアミド酸、ポリアミド酸アンモニウム塩、ポリアミド酸ナトリウム塩及びポリグリオキシル酸等のポリカルボン酸及びその塩;
アクリル酸、メタクリル酸、マレイン酸等のカルボン酸基を有するモノマの単独重合体及び当該重合体のカルボン酸基の部分がアンモニウム塩等である単独重合体等が挙げられる。
水としては、特に制限されないが、脱イオン水、イオン交換水及び超純水等が好ましい。水の含有量は、前記各含有成分の含有量の残部でよく、研磨液中に含有されていれば特に限定されない。なお、研磨液は、必要に応じて水以外の溶媒、例えば、エタノール、アセトン等の極性溶媒等を更に含有してもよい。
本実施形態に係る研磨液には、酸化セリウム粒子を分散させるための分散剤を含有させることができる。分散剤としては、水溶性陰イオン性分散剤、水溶性非イオン性分散剤、水溶性陽イオン性分散剤及び水溶性両性分散剤等が挙げられ、中でも、水溶性陰イオン性分散剤が好ましい。これらは一種類を単独で又は二種類以上を組み合わせて使用することができる。なお、高分子化合物Bとして例示された前記化合物(例えば、ポリアクリル酸アンモニウム)を分散剤として使用することもできる。
本実施形態に係る研磨液は、パラトルエンスルホン酸(及び/又はその塩)、並びにカルボン酸基又はカルボン酸塩基を有する水溶性有機高分子及び/又はその塩とは別の添加剤として水溶性高分子を使用することができる。このような水溶性高分子としては、例えば、アルギン酸、ペクチン酸、カルボキシメチルセルロース、寒天、カードラン及びプルラン等の多糖類;ポリビニルアルコール、ポリビニルピロリドン及びポリアクロレイン等のビニル系ポリマ等が挙げられる。
本実施形態に係る研磨液は、例えば、酸化セリウム粒子、水及び分散剤を配合して酸化セリウム粒子を分散させた後に、さらにパラトルエンスルホン酸(及び/又はその塩)及び高分子化合物Bを添加することによって得られる。なお、本実施形態に係る研磨液は、酸化セリウム粒子、分散剤、パラトルエンスルホン酸(及び/又はその塩)、高分子化合物B、水及び任意に水溶性高分子を含む一液式研磨液として保存してもよく、酸化セリウム粒子、分散剤及び水を含む酸化セリウムスラリ(第1の液)と、パラトルエンスルホン酸(及び/又はその塩)、高分子化合物B、水及び任意に水溶性高分子を含む添加液(第2の液)と、から構成される二液式研磨液として保存してもよい。
本実施形態に係る基板の研磨方法は、基板表面に形成された被研磨膜を前記研磨液を用いて研磨する。より詳しくは、例えば、基板表面に形成された被研磨膜を研磨定盤の研磨パッドに押圧した状態で、前記研磨液を被研磨膜と研磨パッドとの間に供給しながら、基板と研磨定盤とを相対的に動かして被研磨膜を研磨する。
市販の炭酸セリウム水和物40kgをアルミナ製容器に入れ、830℃、空気中で2時間焼成することにより黄白色の粉末を20kg得た。この粉末の相同定をX線回折法で行ったところ酸化セリウムであることを確認した。得られた酸化セリウム粉末20kgを、ジェットミルを用いて乾式粉砕し、粉末状(粒子状)の酸化セリウムを得た。得られた粉末状の酸化セリウムを走査型電子顕微鏡(SEM)で観察したところ、結晶子サイズの粒子と、2個以上の結晶子から構成され結晶粒界を有する粒子とが含まれていた。得られたSEM画像から任意に50個の結晶子を選択し、それぞれについて長径と短径との積の平方根から粒子径を求めたところ、結晶子径はいずれも1〜300nmの範囲に含まれていた。
前記で作製した酸化セリウム粒子200.0gと、脱イオン水795.0gとを混合し、分散剤としてポリアクリル酸アンモニウム水溶液(重量平均分子量:8000、40質量%)5gを添加して、攪拌しながら超音波分散を行い、酸化セリウム分散液を得た。超音波分散は、超音波周波数400kHz、分散時間20分で行った。
研磨試験ウエハとして、SEMATECH社製の商品名「パタンウエハ764」(直径:300mm)を用いた。この研磨試験ウエハとこれを用いた研磨特性の評価方法を、図1を用いて説明する。
項目1:100μm/100μm領域のトレンチ部のディッシング(Dishing)量:触針式段差計(型番P16 KLA−tencor製)を用いて測定した。
項目2:100μm/100μm領域のアクティブ部のSiNロス:ナノメトリクス社製の干渉式膜厚測定装置ナノスペック/AFT5100(商品名)を用い、研磨により除去された窒化珪素膜(SiN膜)の厚さを測定した。
項目3:20μm/80μm領域及び80μm/20μm領域のトレンチ部のSiO2残膜厚差(SiO2密度差):ナノメトリクス社製の干渉式膜厚測定装置ナノスペック/AFT5100(商品名)を用いて、それぞれの領域における酸化珪素膜(SiO2膜)の残膜厚を測定し、その差を求めた。
研磨液のpH、パラトルエンスルホン酸一水和物の使用量、又は高分子化合物Bの使用量を表1〜3に示すものへ変更した以外は、実施例1と同様にして酸化セリウム研磨液を作製し、絶縁膜の研磨を行った。結果を同表に示す。表1〜3から、本発明により提供される研磨液により平坦性の指標である上記3項目の向上が達成されることが明らかとなった。
Claims (10)
- 酸化セリウム粒子、パラトルエンスルホン酸、カルボン酸基又はカルボン酸塩基を有する高分子化合物B、水溶性陰イオン性分散剤及び水を含むCMP用の研磨液であって、
前記パラトルエンスルホン酸の含有量が、研磨液全質量に対して0.001〜1質量%であり、
前記高分子化合物Bの含有量が、研磨液全質量に対して0.01〜0.50質量%であり、
pHが4.0以上7.0以下である、研磨液。 - 前記水溶性陰イオン性分散剤が、共重合成分としてアクリル酸を含む高分子及びその塩、ラウリル硫酸トリエタノールアミン、ラウリル硫酸アンモニウム、ポリオキシエチレンアルキルエーテル硫酸トリエタノールアミン並びに特殊ポリカルボン酸型高分子分散剤からなる群より選ばれる少なくとも一種である、請求項1に記載の研磨液。
- 前記共重合成分としてアクリル酸を含む高分子及びその塩が、ポリアクリル酸及びそのアンモニウム塩、アクリル酸とメタクリル酸との共重合体及びそのアンモニウム塩、並びにアクリル酸アミドとアクリル酸との共重合体及びそのアンモニウム塩からなる群より選ばれる少なくとも一種である、請求項2に記載の研磨液。
- 前記パラトルエンスルホン酸の含有量が、研磨液全質量に対して0.005〜0.1質量%である、請求項1〜3のいずれか一項に記載の研磨液。
- 前記高分子化合物Bが、ポリアスパラギン酸、ポリグルタミン酸、ポリリシン、ポリリンゴ酸、ポリアミド酸、ポリアミド酸アンモニウム塩、ポリアミド酸ナトリウム塩及びポリグリオキシル酸;アクリル酸、メタクリル酸及びマレイン酸からなる群より選ばれるカルボン酸基を有するモノマの単独重合体;前記単独重合体の前記カルボン酸基の部分がアンモニウム塩である単独重合体;カルボン酸塩基を有するモノマとカルボン酸のアルキルエステルとの共重合体;並びにポリ(メタ)アクリル酸のカルボン酸基の一部がカルボン酸アンモニウム塩基に置換されたポリマ、からなる群より選ばれる、請求項1〜4のいずれか一項に記載の研磨液。
- 前記高分子化合物Bの含有量が、研磨液全質量に対して0.02〜0.40質量%である、請求項1〜5のいずれか一項に記載の研磨液。
- pHが4.0以上6.0以下である、請求項1〜6のいずれか一項に記載の研磨液。
- pHが4.0以上5.5以下である、請求項1〜7のいずれか一項に記載の研磨液。
- 前記酸化セリウム粒子、前記水溶性陰イオン性分散剤及び前記水を含む第1の液と、前記パラトルエンスルホン酸、前記高分子化合物B及び前記水を含む第2の液と、から構成される二液式研磨液として保存される、請求項1〜8のいずれか一項に記載の研磨液。
- 基板表面に形成された被研磨膜を請求項1〜9のいずれか一項に記載の研磨液を用いて研磨する、基板の研磨方法。
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JP2016522855A (ja) * | 2013-05-15 | 2016-08-04 | ビーエーエスエフ ソシエタス・ヨーロピアBasf Se | N−ビニル−ホモポリマーおよびn−ビニルコポリマーからなる群から選択される1種または複数のポリマーを含む化学機械研磨組成物 |
KR20160008597A (ko) * | 2013-05-15 | 2016-01-22 | 바스프 에스이 | N,n,n'',n''-테트라키스-(2-히드록시프로필)-에틸렌디아민 또는 메탄술폰산을 포함하는 화학적-기계적 연마 조성물 |
EP3099756A4 (en) * | 2014-01-31 | 2017-08-02 | Basf Se | A chemical mechanical polishing (cmp) composition comprising a poly(aminoacid) |
JP6694674B2 (ja) | 2014-11-07 | 2020-05-20 | 株式会社フジミインコーポレーテッド | 研磨方法およびポリシング用組成物 |
US9758697B2 (en) * | 2015-03-05 | 2017-09-12 | Cabot Microelectronics Corporation | Polishing composition containing cationic polymer additive |
WO2016143797A1 (ja) * | 2015-03-10 | 2016-09-15 | 日立化成株式会社 | 研磨剤、研磨剤用貯蔵液及び研磨方法 |
JP6393231B2 (ja) * | 2015-05-08 | 2018-09-19 | 信越化学工業株式会社 | 合成石英ガラス基板用研磨剤及び合成石英ガラス基板の研磨方法 |
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CN103155112B (zh) | 2016-10-12 |
KR101389235B1 (ko) | 2014-04-24 |
KR20140039143A (ko) | 2014-04-01 |
US20130260558A1 (en) | 2013-10-03 |
JP5333571B2 (ja) | 2013-11-06 |
TW201229222A (en) | 2012-07-16 |
JP2016183346A (ja) | 2016-10-20 |
JP2012146971A (ja) | 2012-08-02 |
JP6269733B2 (ja) | 2018-01-31 |
JP2012146970A (ja) | 2012-08-02 |
JP5510574B2 (ja) | 2014-06-04 |
KR101886464B1 (ko) | 2018-08-07 |
TWI437087B (zh) | 2014-05-11 |
US20170133237A1 (en) | 2017-05-11 |
CN106433480A (zh) | 2017-02-22 |
JP2012146976A (ja) | 2012-08-02 |
KR20140041388A (ko) | 2014-04-04 |
JP2012146975A (ja) | 2012-08-02 |
CN103155112A (zh) | 2013-06-12 |
JP2012146973A (ja) | 2012-08-02 |
JP2013149987A (ja) | 2013-08-01 |
SG190765A1 (en) | 2013-07-31 |
JP2012146974A (ja) | 2012-08-02 |
US9564337B2 (en) | 2017-02-07 |
JP2013149988A (ja) | 2013-08-01 |
TW201350567A (zh) | 2013-12-16 |
WO2012086781A1 (ja) | 2012-06-28 |
JP2012146972A (ja) | 2012-08-02 |
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