JP2012231170A - 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
- Publication number
- JP2012231170A JP2012231170A JP2012157758A JP2012157758A JP2012231170A JP 2012231170 A JP2012231170 A JP 2012231170A JP 2012157758 A JP2012157758 A JP 2012157758A JP 2012157758 A JP2012157758 A JP 2012157758A JP 2012231170 A JP2012231170 A JP 2012231170A
- Authority
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- Prior art keywords
- metal
- polishing
- film
- polishing liquid
- abrasive grains
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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- 238000000034 method Methods 0.000 title claims description 33
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- 239000003795 chemical substances by application Substances 0.000 claims abstract description 6
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- ZIBGPFATKBEMQZ-UHFFFAOYSA-N triethylene glycol Chemical compound OCCOCCOCCO ZIBGPFATKBEMQZ-UHFFFAOYSA-N 0.000 description 1
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- YFNKIDBQEZZDLK-UHFFFAOYSA-N triglyme Chemical compound COCCOCCOCCOC YFNKIDBQEZZDLK-UHFFFAOYSA-N 0.000 description 1
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- 229920002554 vinyl polymer Polymers 0.000 description 1
- 229920003169 water-soluble polymer Polymers 0.000 description 1
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Abstract
【解決手段】砥粒、酸化金属溶解剤及び水を含有した金属用研磨液であって、前記砥粒が、平均2次粒径が異なる砥粒を2種類以上含む。また、前記砥粒の平均2次粒径が1〜1000nmであることを特徴とする金属用研磨液。及び前記砥粒が、平均2次粒径5〜39nmの第一の砥粒と平均2次粒径40〜300nmの第二の砥粒とを含むことを特徴とする金属用研磨液を含む。
【選択図】図1
Description
(研磨液作製方法)
表1に示す材料をそれぞれの配合(質量部)で混合して、実施例1〜8及び比較例1〜2に使用する金属用研磨液を調製した。この金属用研磨液を用いて下記の研磨条件で、下記で得た基板の研磨を行った。
砥粒の平均2次粒径は、動的散乱法に基づいたサブミクロン粒子アナライザー(BECKMAN COULTER社製、機種名:N5 Submicron Particle Size Analyzer)を用いて測定した。
砥粒の平均1次粒径は、超高分解能電子顕微鏡(SEM)(日立協和エンジニアリング株式会社製、機種名:日立 S−4800)を用いて撮影し大きさを実測した。
以下の基板を用意した。
ブランケット基板(a1):シリコン基板上にトリメチルシランを出発原料としてCVD法で成膜されたオルガノシリケートグラス(厚さ:1000nm)を形成。
パターン基板(b1):シリコン基板上に層間絶縁膜絶縁膜層としてトリメチルシランを出発原料としたオルガノシリケートグラスをCVD法で成膜した。このオルガノシリケートグラスに公知の方法を用いて深さ0.5μmの溝(凹部)を形成して、この表面に沿ってスパッタ法により金属バリア層として厚さ200nmのタンタル膜を形成した。前記タンタル膜の上に、スパッタ法により前記溝を埋めるように導電性物質層として銅膜を1.0μm形成した。突出している該銅膜だけをシリカ系研磨液(日立化成社製、製品名:HS-C500-10)を用いて第1のCMP工程における研磨を行い、被研磨面に凸部のバリア層を露出させ、パターン基板(b1)を得た。
研磨パッド:発泡ポリウレタン樹脂(ロデール社製、型番:IC1000)
研磨圧力:140g/cm2(13.73kPa)
研磨定盤及びウエハホルダーの回転数:90rpm
研磨液の供給量:150ml/min
(1)研磨速度:各ブランケット基板(a1)〜(a4)を上記条件で、金属用研磨液を用い60秒研磨した。オルガノシリケートグラス及び二酸化ケイ素の研磨速度は研磨前後での膜厚差を大日本スクリーン製造株式会社製、膜厚測定装置(製品名:ラムダエース)を用いて測定し求めた。また、タンタル及び銅の研磨速度は研磨前後での膜厚差を電気抵抗値から換算して求めた。
コロイダルシリカB:平均2次粒径:28nm、平均1次粒径:13nm
コロイダルシリカC:平均2次粒径:50nm、平均1次粒径:26nm
コロイダルシリカD:平均2次粒径:70nm、平均1次粒径:43nm
コロイダルシリカE:平均2次粒径:90nm、平均1次粒径:50nm
Claims (23)
- 砥粒、酸化金属溶解剤及び水を含有した金属用研磨液であって、前記砥粒が、平均2次粒径が異なる砥粒を2種類以上含むことを特徴とする金属用研磨液。
- 前記砥粒の平均2次粒径が1〜1000nmであることを特徴とする請求項1記載の金属用研磨液。
- 前記砥粒が、平均2次粒径5〜39nmの第一の砥粒と平均2次粒径40〜300nmの第二の砥粒とを含むことを特徴とする請求項1記載の金属用研磨液。
- 前記砥粒が、平均1次粒径2〜100nmの砥粒を含むことを特徴とする請求項1記載の金属用研磨液。
- pHが2〜5である請求項1〜4のいずれか一項記載の金属用研磨液。
- 前記砥粒が、シリカ、アルミナ、セリア、チタニア、ジルコニア及びゲルマニアから選ばれる少なくとも1種である請求項1〜5のいずれか一項記載の金属用研磨液。
- 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及び無機酸から選ばれる少なくとも1種である請求項1〜6のいずれか一項記載の金属用研磨液。
- さらに金属の酸化剤を含有する請求項1〜7のいずれか一項記載の金属用研磨液。
- 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8記載の金属用研磨液。
- さらに金属防食剤を含有する請求項1〜9のいずれか一項記載の金属用研磨液。
- さらに有機溶媒を含有する請求項1〜10のいずれか一項記載の金属用研磨液。
- 前記有機溶媒がグリコールエーテル化合物、アルコール化合物及びカーボネート化合物から選ばれる少なくとも1種である請求項11記載の金属用研磨液。
- 重量平均分子量が500以上のポリマをさらに含有する請求項1〜12のいずれか一項に記載の金属用研磨液。
- 金属用研磨液によって研磨される被研磨膜が、導電性物質層及び金属バリア層を含む被研磨膜である請求項1〜13のいずれか一項記載の金属用研磨液。
- 金属用研磨液によって研磨される被研磨膜が、導電性物質層及び層間絶縁膜を含む被研磨膜である請求項1〜13のいずれか一項記載の金属用研磨液。
- 金属用研磨液によって研磨される被研磨膜が、金属バリア層及び層間絶縁膜を含む被研磨膜である請求項1〜13のいずれか一項記載の金属用研磨液。
- 金属用研磨液によって研磨される被研磨膜が、導電性物質層、金属バリア層及び層間絶縁膜を含む被研磨膜である請求項1〜13のいずれか一項記載の金属用研磨液。
- 前記導電性物質層が、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種から成る層である請求項14、15又は17のいずれか一項記載の金属用研磨液。
- 前記金属バリア層が、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、ルテニウム化合物、銅とマンガンとの合金、銅とマンガンと酸化ケイ素との合金から選ばれる少なくとも1種からなる1層、又は2層以上の積層である、請求項14、16又は17のいずれか一項記載の金属用研磨液。
- 前記層間絶縁膜が、シリコン系被膜又は有機ポリマ膜である請求項15〜17のいずれか一項記載の金属用研磨液。
- 前記砥粒は、金属用研磨液の総量100質量部に対して、0.001〜50質量部である請求項1〜20のいずれか一項に記載の金属用研磨液。
- 導電性物質層と層間絶縁膜の研磨速度比が0.72以下である請求項15、17〜21のいずれか一項に記載の金属用研磨液。
- 研磨定盤の研磨布上に請求項1〜22のいずれか一項記載の金属用研磨液を供給しながら、被研磨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すことによって被研磨膜を研磨する研磨方法。
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TWI410469B (zh) | 2013-10-01 |
CN101611476B (zh) | 2015-11-25 |
US20100120250A1 (en) | 2010-05-13 |
US8821750B2 (en) | 2014-09-02 |
KR101418626B1 (ko) | 2014-07-14 |
JPWO2008105342A1 (ja) | 2010-06-03 |
TW200918622A (en) | 2009-05-01 |
WO2008105342A1 (ja) | 2008-09-04 |
JP5533951B2 (ja) | 2014-06-25 |
CN101611476A (zh) | 2009-12-23 |
CN102690607A (zh) | 2012-09-26 |
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