JP2018049992A - 表面処理組成物、ならびにこれを用いた表面処理方法および半導体基板の製造方法 - Google Patents
表面処理組成物、ならびにこれを用いた表面処理方法および半導体基板の製造方法 Download PDFInfo
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- JP2018049992A JP2018049992A JP2016185775A JP2016185775A JP2018049992A JP 2018049992 A JP2018049992 A JP 2018049992A JP 2016185775 A JP2016185775 A JP 2016185775A JP 2016185775 A JP2016185775 A JP 2016185775A JP 2018049992 A JP2018049992 A JP 2018049992A
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- surface treatment
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- acid
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Abstract
Description
本明細書において、研磨済研磨対象物とは、研磨工程において研磨された後の研磨対象物を意味する。研磨工程としては、特に制限されないが、CMP工程であることが好ましい。
本発明の一形態は、スルホン酸(塩)基を有する高分子化合物と、アミノ酸およびポリオールから選ばれる少なくとも1種の化合物と、分散媒とを含有し、少なくともタングステンを含む層、並びにTEOSまたは窒化ケイ素を有する研磨済研磨対象物に用いられる、表面処理組成物。
本発明の一形態に係る表面処理組成物は、スルホン酸(塩)基を有する高分子化合物を必須に含む。スルホン酸(塩)基を有する高分子化合物(スルホン酸基含有高分子)は、表面処理組成物による不純物の除去に寄与する。なお、本明細書において、「スルホン酸(塩)基」とは、「スルホン酸基」または「スルホン酸塩基」を表す。
本発明の一形態に係る表面処理組成物は、アミノ酸およびポリオールから選ばれる少なくとも1種の化合物を必須に含む。本発明におけるアミノ酸およびポリオールは、タングステンの溶解速度の抑制剤として添加される。アミノ酸およびポリオールの少なくとも1種を含むことで、本発明の表面処理組成物は研磨済研磨対象物に含まれるタングステンの溶解速度を低減することで、研磨済研磨対象物の表面荒れを改善することができる。
本発明の表面処理組成物に用いるアミノ酸は、アミノ基とカルボキシル基の両方の官能基を持つ有機化合物を指す。本発明の好ましい実施形態において、アミノ酸のPI値(等電点)は7.0以上であることが好ましい。本発明の一形態に係る表面処理組成物が酸性であり、酸性環境下で、前記のようなPI値が7.0以上であるアミノ酸は正に帯電し、マイナスチャージしているタングステン表面に静電的に吸着しやすく、タングステンの溶解速度を低下させることができる。PI値が7.0以上のアミノ酸としては、アルギニン、リシン、ヒスチジン等が挙げられるが、これに限られることはない。
本発明の表面処理組成物に用いるポリオールは、分子内に2以上のアルコール性ヒドロキシル基を持つ化合物であれば、特に制限することがない。水素結合の形成の観点から、前記ポリオールは多価アルコール及び糖類から選ばれる少なくとも1種であることが好ましい。また、ポリオールとして低分子量の化合物を使用する場合は、2〜10個のアルコール性ヒドロキシル基を持つものが好ましい。ポリオールとして高分子化合物を使用する場合は、アルコール性ヒドロキシル基の数が前記のように制限されないが、高分子化合物の重量平均分子量が90〜3000であるものが好ましい。前記多価アルコールの具体例として、グリコール、グリセリン、ポリグリセリン等が挙げられる。前記糖類の具体例として、ラクチトール、マルチトール、マンニトールなどが挙げられる。
本発明の一形態に係る表面処理組成物は、pH調整剤として酸を含むことが好ましい。なお、本明細書において、スルホン酸系高分子はここで述べる添加剤としての酸とは異なるものとして取り扱う。酸は、窒化ケイ素またはTEOSを含む表面処理組成物の表面および不純物の表面を正電荷で帯電させる役割を担うと推測され、表面処理組成物による不純物の除去に寄与すると考えられる。
本発明の一形態に係る表面処理組成物は、分散媒(溶媒)を必須に含む。分散媒は、各成分を分散または溶解させる機能を有する。分散媒は、水のみであることがより好ましい。また、分散媒は、各成分の分散または溶解のために、水と有機溶媒との混合溶媒であってもよい。この場合、用いられる有機溶媒としては、水と混和する有機溶媒であるアセトン、アセトニトリル、エタノール、メタノール、イソプロパノール、グリセリン、エチレングリコール、プロピレングリコール等が挙げられる。また、これらの有機溶媒を水と混合せずに用いて、各成分を分散または溶解した後に、水と混合してもよい。これら有機溶媒は、単独でもまたは2種以上組み合わせても用いることができる。
本発明の一形態に係る表面処理組成物は、本発明の効果を阻害しない範囲内において、必要に応じて、他の添加剤を任意の割合で含有していてもよい。ただし、本発明の一形態に係る表面処理組成物の必須成分以外の成分は、不純物の原因となりうるためできる限り添加しないことが望ましいため、その添加量はできる限り少ないことが好ましく、含まないことがより好ましい。他の添加剤としては、例えば、アルカリ、防腐剤、溶存ガス、還元剤、酸化剤およびアルカノールアミン類等が挙げられる。
<表面処理方法>
本願明細書において、表面処理方法または表面処理工程とは、研磨顆粒を用いずに研磨済研磨対象物の表面における不純物を低減する方法または工程をいう。
本発明のその他の一形態は、前記表面処理方法によって、研磨済研磨対象物の表面を処理する工程を含む、半導体基板の製造方法である。
本発明の一形態に係る半導体基板の製造方法に含まれうる研磨工程は、窒化ケイ素、またはTEOSを含む半導体基板を研磨して、研磨済半導体基板を形成する工程である。
[表面処理組成物1の調製]
ポリスチレンスルホン酸(Alfa Aesar社製、Mw=75,000)を最終の表面処理組成物に対して0.1質量%、ヒスチジン(Alfa Aesar社製)を最終の表面処理組成物に対して0.05質量%、表面処理組成物のpHが3になるように硝酸水溶液(70%)および水(脱イオン水)を加えることで表面処理組成物1を調製した。表面処理組成物1(液温:25℃)のpH値は、pHメータ(株式会社堀場製作所製 型番:LAQUA)により確認した。
ヒスチジンを、下記表1に示す種類の各成分に変更した以外は、表面処理組成物1の調製と同様に操作して、各表面処理組成物を調製した。なお、表中の「−」は該当する成分を用いなかったことを示す。
・表面処理組成物3に使用:リシン(Alfa Aesar社製)
・表面処理組成物4に使用:システイン(Alfa Aesar社製)
・表面処理組成物5に使用:マルチトール(Alfa Aesar社製)
・表面処理組成物6に使用:グリセリン(J.T. Baker社製)
・表面処理組成物7に使用:ポリグリセリン(株式会社ダイセル製 型番PGL 40、重量平均分子量2,981)
・表面処理組成物8に使用:イミノ二酢酸(Sigma−Aldrich社製)
・表面処理組成物9に使用:アスコルビン酸(Sigma−Aldrich社製)
・表面処理組成物10に使用:ニコチン酸(Sigma−Aldrich社製)
・表面処理組成物11に使用:フタル酸(Fluka社製)
・表面処理組成物12に使用:ピラゾール(Sigma−Aldrich社製)
・表面処理組成物13に使用:フェニルテトラゾール(東京化成工業株式会社製)
・表面処理組成物14に使用:ベンジルトリメチルアンモニウムヒドロキシド(Sigma−Aldrich社製)
・表面処理組成物15に使用:ニコチンアミド(Sigma−Aldrich社製)
・表面処理組成物16に使用:ヒスチジン(Alfa Aesar社製)
・表面処理組成物17に使用:ポリグリセリン(株式会社ダイセル製 型番PGL 40、重量平均分子量2,981)
<研磨済研磨対象物の準備>
下記化学的機械的研磨(CMP)工程によって研磨された後の、研磨済窒化ケイ素基板、研磨済TEOS基板を、研磨済研磨対象物として準備した。
半導体基板である窒化ケイ素基板、およびTEOS基板について、研磨用組成物B(組成:コロイダルシリカ(扶桑化学工業株式会社製、一次粒子径35nm、二次粒子径70nm)4質量%、濃度30質量%のマレイン酸でpHを5に調整、溶媒:水)を使用し、それぞれ下記の条件にて研磨を行った。ここで、窒化ケイ素基板、TEOS基板およびポリシリコン基板は、300mmウエハを使用した。
研磨装置:荏原製作所製 FREX 300E
研磨パッド:富士紡ホールディングス株式会社製 H800
研磨圧力:2.0psi(1psi=6894.76Pa、以下同様)
研磨定盤回転数:90rpm
ヘッド回転数:91rpm
研磨用組成物の供給:掛け流し
研磨用組成物供給量:300ml/分
研磨時間:60秒間。
前記調製した各表面処理組成物または水(脱イオン水)を用いて、下記条件によって、各研磨済基板を表面処理した。
(表面処理装置および表面処理条件)
装置:荏原製作所製 FREX 300E
研磨パッド:富士紡ホールディングス株式会社製 H800
研磨圧力:1.0psi
研磨定盤回転数:60rpm
ヘッド回転数:63rpm
表面処理組成物の供給:掛け流し
表面処理組成物供給量:300ml/分
表面処理時間:60秒間。
最後に、上記表面処理済みの各基板を、PVAブラシを用いながら純水(DIW)で1分間流し、スピン乾燥を行った。
上記表面処理された各研磨済基板について、下記項目について測定し評価を行った。評価結果を表1に合わせて示す。
各表面処理組成物を用いて、上記に示す表面処理条件で研磨済基板を表面処理した後の、0.12μm以上の不純物数を評価した。不純物数の評価にはKLA TENCOR社製SP−1を使用し、LPD値を測定した。LPD値が高いほど悪い不純物残留性能を示す。
タングステン基板(厚さ1000Å)を3×3cmサイズにカットし、表面処理組成物に43℃で5分間浸した。以下の式1を用いてタングステンの溶解速度を求めた。また、その結果を表1にまとめた。
Claims (9)
- スルホン酸(塩)基を有する高分子化合物と、アミノ酸およびポリオールから選ばれる少なくとも1種の化合物と、分散媒とを含有し、
少なくともタングステンを含む層、並びにオルトケイ酸テトラエチルまたは窒化ケイ素を有する研磨済研磨対象物の表面を処理するために用いられる、表面処理組成物。 - pHが酸性である、請求項1に記載の表面処理組成物。
- 前記スルホン酸(塩)基を有する高分子化合物の重量平均分子量が1,000以上である、請求項1または2に記載の表面処理組成物。
- 前記アミノ酸のPI値が7.0以上である、請求項1〜3のいずれか1項に記載の表面処理組成物。
- 前記アミノ酸が塩基性アミノ酸である、請求項1〜4のいずれか1項に記載の表面処理組成物。
- 前記アミノ酸が硫黄原子を含有する、請求項1〜5のいずれか1項に記載の表面処理組成物。
- 前記ポリオールが、多価アルコール及び糖類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1項に記載の表面処理組成物。
- 請求項1〜7のいずれか1項に記載の表面処理組成物を用いて研磨済研磨対象物の表面を処理する、表面処理方法。
- 請求項8に記載の表面処理方法によって、研磨済研磨対象物の表面を処理する工程を含む、半導体基板の製造方法。
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CN202410170264.5A CN118109250A (zh) | 2016-09-23 | 2017-08-28 | 表面处理组合物、以及使用其的表面处理方法和半导体基板的制造方法 |
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