JP2020158752A - 研磨用組成物および研磨方法 - Google Patents
研磨用組成物および研磨方法 Download PDFInfo
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- JP2020158752A JP2020158752A JP2019161443A JP2019161443A JP2020158752A JP 2020158752 A JP2020158752 A JP 2020158752A JP 2019161443 A JP2019161443 A JP 2019161443A JP 2019161443 A JP2019161443 A JP 2019161443A JP 2020158752 A JP2020158752 A JP 2020158752A
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Abstract
Description
本発明に係る研磨対象物は、ケイ素−ケイ素結合を有するケイ素材料を含む。ケイ素−ケイ素結合を有するケイ素材料としては、例えば、ポリシリコン(Poly−Si)、アモルファスシリコン、単結晶シリコン、n型ドープ単結晶シリコン、p型ドープ単結晶シリコン、SiGe等のSi系合金等が挙げられる。これらの中でも、ポリシリコンが好ましい。
本発明の一実施形態による研磨用組成物は、砥粒としてシリカ粒子を含む。砥粒は、研磨対象物を機械的に研磨する作用を有する。
本発明の一実施形態による研磨用組成物は、ケイ素−ケイ素結合を有するケイ素材料を含む研磨対象物の研磨速度を調整する機能を有する研磨速度調整剤を含む。
研磨速度向上剤の例としては、例えば、ポリカルボン酸、ポリカルボン酸アミド、ポリカルボン酸エステル、ポリカルボン酸塩、ポリスルホン酸、ポリホスホン酸、ビニル系ポリマー等の水溶性高分子や、アミド化合物、イミド化合物、アミン化合物等が挙げられる。
研磨速度抑制剤の例としては、例えば、ポリアルキレン鎖を有する水溶性高分子、ポリオキシアルキレン鎖を有する界面活性剤等が挙げられる。
本発明の一実施形態による研磨用組成物は、バイオサイドを含む。バイオサイドは「殺生物剤」とも呼ばれ、微生物(生菌)を不活化または破壊する薬剤を意味する。バイオサイドには、防腐剤、防かび剤、防藻剤、防虫剤、忌避剤等が含まれる。これらバイオサイドは、単独でもまたは2種以上混合しても用いることができる。また、バイオサイドは市販品を用いてもよいし合成品を用いてもよい。
本発明に係るバイオサイドとしては、下記化学式1で表される化合物が好ましい。
本発明に用いられるバイオサイドとしては、不飽和脂肪酸もまた好ましい。不飽和脂肪酸の例としては、クロトン酸、ミリストレイン酸、パルミトレイン酸、オレイン酸、リシノール酸等のモノ不飽和脂肪酸;ソルビン酸、リノール酸、エイコサジエン酸等のジ不飽和脂肪酸;リノレン酸、ピノレン酸、エレオステアリン酸等のトリ不飽和脂肪酸;ステアリドン酸やアラキドン酸等のテトラ不飽和脂肪酸;ボセオペンタエン酸、エイコサペンタエン酸等のペンタ不飽和脂肪酸;ドコサヘキサエン酸、ニシン酸等のヘキサ不飽和脂肪酸;等が挙げられる。
本発明の研磨用組成物は、研磨用組成物を構成する各成分の分散のために分散媒を用いることが好ましい。分散媒としては、有機溶媒、水が挙げられるが、その中でも水を含むことが好ましい。
本発明の研磨用組成物のpHは、特に制限されないが、7未満(7.0未満)であることが好ましい。pHが7以上(7.0以上)であると、研磨対象物の研磨速度が低下する場合がある。該pHは、好ましくは6.5以下であり、より好ましくは6以下(6.0以下)であり、さらに好ましくは5.5以下であり、特に好ましくは5以下(5.0以下)である。また、該pHの下限は、好ましくは1以上(1.0以上)であり、より好ましくは2以上(2.0以上)であり、さらに好ましくは3以上(3.0以上)であり、よりさらに好ましくは3.5を超え、特に好ましくは3.8以上である。
本発明に係る研磨用組成物は、pHを上記範囲内に調整する目的で、pH調整剤をさらに含んでいてもよい。
本発明の研磨用組成物は、本発明の効果を損なわない範囲において、キレート剤、増粘剤、酸化剤、分散剤、表面保護剤、濡れ剤、界面活性剤、溶解助剤等の公知の添加剤をさらに含有してもよい。上記添加剤の含有量は、その添加目的に応じて適宜設定すればよい。以下では、好ましい添加剤である溶解助剤について説明する。
溶解助剤とは、本発明に係るバイオサイドを分散媒(溶媒)に溶解させる際に共存させて、バイオサイドの溶解性を向上させる物質である。本発明の一実施形態による研磨用組成物は、溶解助剤をさらに含むことが好ましい。
本発明の研磨用組成物の製造方法は、特に制限されず、例えば、シリカ粒子、研磨速度調整剤、バイオサイド、および必要に応じて他の添加剤を、分散媒中で攪拌混合することにより得ることができる。各成分の詳細は上述した通りである。
本発明は、本発明の一実施形態に係る研磨用組成物を用いてケイ素−ケイ素結合を有するケイ素材料を含む研磨対象物を研磨することを有する研磨方法を提供する。また、本発明は、上記研磨方法を有する、半導体基板の製造方法を提供する。
カチオン変性シリカとして、平均一次粒子径31nm、平均二次粒子径62nm、平均会合度2.0のアミノ基修飾コロイダルシリカを準備した。また、アニオン変性シリカとして、スルホン酸修飾コロイダルシリカ(“Sulfonic acid−functionalized silica through quantitative oxidation of thiol groups”, Chem. Commun. 246−247 (2003)に記載の方法で作製したもの、平均一次粒子径32nm、平均二次粒子径69nm、平均会合度2.2)を準備した。
(実施例1)
シリカ粒子であるカチオン変性シリカを、研磨用組成物の総量に対して0.25質量%の添加量となるように、研磨速度調整剤としてポリエチレングリコール(重量平均分子量(Mw):600)を、研磨用組成物の総量に対して0.01質量%の添加量となるように、バイオサイドとしてパラオキシ安息香酸エチルを、研磨用組成物の総量に対して0.03質量%の添加量となるように、溶解助剤としてエタノールを研磨用組成物の総量に対して0.5質量%の添加量となるように、それぞれ分散媒である水に加えた。
シリカ粒子の種類、研磨速度調整剤(研磨速度抑制剤)の種類、バイオサイドの種類および量、ならびに溶解助剤の種類および量を下記表1のように変更したこと以外は、実施例1と同様にして、各研磨用組成物を調製した。なお、下記表1中の「−」は、その剤を使用していないことを表す。
研磨対象物として、表面に厚さ5000Åのポリシリコン(Poly−Si)膜を形成したシリコンウェーハ(200mm、ブランケットウェーハ:株式会社アドバンテック製)を準備した。上記で得られた各研磨用組成物を用いて、基板を以下の研磨条件で研磨した。
各研磨用組成物について防腐性能を評価するために、以下の通り微生物を強制的に添加し、一定期間培養する試験を行った。各研磨用組成物50gに種菌を添加した工業用水(総菌数108個/mL以上)2gを添加し、35℃で5日間または10日間静置した。その後、三愛石油株式会社製のバイオチェッカー(型番:サンアイバイオチェッカーTTC)を用いて、35℃、5日間または10日間の培養条件での生菌数を測定した。
(研磨条件)
研磨機として、Mirra(アプライド マテリアル社製)、研磨パッドとしてIC1000(ロームアンドハース社製)、研磨パッドのコンディショナーとしてA165(3M社製)をそれぞれ用いた。研磨圧力4.0psi(27.59kPa)、定盤回転数123rpm、ヘッド回転数117rpm、研磨用組成物の供給速度130ml/minの条件で、研磨時間は60秒で研磨を実施した。コンディショナーによるパッドコンディショニングは、研磨中に回転数120rpm、圧力5lbf(22.24N)、in−situで行った。
各研磨用組成物1Lを0℃にて24時間保管後、メンブレンフィルタを用いて以下の条件で吸引濾過した。このフィルタを乾燥させた後の状態を目視にて確認した:
[濾過条件]
使用フィルタ:種類 東洋濾紙株式会社製のメンブレンフィルタ(φ47mm、ディスク型)
材質 混合セルロースエステル
孔径 1.0μm
吸引ポンプ:アルバック機工株式会社製のポータブルアスピレーターMDA−015
[判断基準]
溶け残りあり:乾燥後のメンブレンフィルタ上にバイオサイド由来の鱗片状の析出物が目視で確認される
良好:乾燥後のメンブレンフィルタ上にバイオサイド由来の鱗片状の析出物が目視で確認されない
−:バイオサイド未添加のため、データなし。
シリカ粒子の種類、研磨速度調整剤(研磨速度向上剤)の種類および量、バイオサイドの種類および量、ならびに溶解助剤の種類を下記表3のように変更したこと以外は、実施例1と同様にして、各研磨用組成物を調製した。なお、下記表3中の「−」は、その剤を使用していないことを表す。
Claims (13)
- シリカ粒子、ケイ素−ケイ素結合を有するケイ素材料を含む研磨対象物に対する研磨速度調整剤、およびバイオサイドを含む研磨用組成物であって、
前記バイオサイドは、炭素原子、水素原子および酸素原子から構成される、研磨用組成物。 - 前記シリカ粒子が、カチオン変性シリカ粒子である、請求項1に記載の研磨用組成物。
- 前記バイオサイドは、下記化学式1で表される化合物である、請求項1または2に記載の研磨用組成物:
前記化学式1中、R1〜R5は、それぞれ独立して、水素原子、または炭素原子、水素原子、および酸素原子からなる群より選択される少なくとも2種の原子から構成される置換基である。 - 前記バイオサイドは、下記化学式1−a〜1−cで表される化合物からなる群より選択される少なくとも1種である、請求項3に記載の研磨用組成物:
前記化学式1中、R1〜R3は、それぞれ独立して、炭素原子、水素原子、および酸素原子からなる群より選択される少なくとも2種の原子から構成される置換基である。 - 前記バイオサイドは、パラオキシ安息香酸エチル、パラオキシ安息香酸ブチル、およびフェニルフェノールからなる群より選択される少なくとも1種である、請求項3または4に記載の研磨用組成物。
- 前記バイオサイドは、不飽和脂肪酸である、請求項1または2に記載の研磨用組成物。
- 前記不飽和脂肪酸は、ソルビン酸である、請求項6に記載の研磨用組成物。
- 前記ケイ素−ケイ素結合を有するケイ素材料を含む研磨対象物に対する研磨速度調整剤は、ポリアルキレン鎖を有する水溶性高分子およびポリオキシアルキレン鎖を持つ界面活性剤からなる群より選択される少なくとも1種である、請求項1〜7のいずれか1項に記載の研磨用組成物。
- 前記ポリアルキレン鎖を有する水溶性高分子は、ポリアルキレングリコールおよびポリアルキレン共重合体からなる群より選択される少なくとも1種である、請求項8に記載の研磨用組成物。
- 前記ポリアルキレングリコールは、ポリプロピレングリコールおよびポリブチレングリコールの少なくとも一方である、請求項9に記載の研磨用組成物。
- pHが3.5を超える、請求項1〜10のいずれか1項に記載の研磨用組成物。
- 前記バイオサイドの溶解助剤をさらに含む、請求項1〜11のいずれか1項に記載の研磨用組成物。
- 請求項1〜12のいずれか1項に記載の研磨用組成物を用いてケイ素−ケイ素結合を有するケイ素材料を含む研磨対象物を研磨することを有する、研磨方法。
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KR20220144631A (ko) * | 2021-04-20 | 2022-10-27 | 주식회사 케이씨텍 | 연마 슬러리 조성물 |
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JP2005288576A (ja) * | 2004-03-31 | 2005-10-20 | Noritake Co Ltd | ポリッシング加工用ルブリカント及びそれからなるポリッシング加工用スラリー |
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JPH03197575A (ja) * | 1989-06-09 | 1991-08-28 | Nalco Chem Co | コロイド状シリカ研磨性スラリー |
JP2005288576A (ja) * | 2004-03-31 | 2005-10-20 | Noritake Co Ltd | ポリッシング加工用ルブリカント及びそれからなるポリッシング加工用スラリー |
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WO2022209758A1 (ja) * | 2021-03-30 | 2022-10-06 | 株式会社フジミインコーポレーテッド | 研磨方法、研磨用組成物セット |
KR20220144631A (ko) * | 2021-04-20 | 2022-10-27 | 주식회사 케이씨텍 | 연마 슬러리 조성물 |
KR102638342B1 (ko) * | 2021-04-20 | 2024-02-21 | 주식회사 케이씨텍 | 연마 슬러리 조성물 |
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