JP7322137B2 - 表面処理組成物、その製造方法、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、その製造方法、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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- JP7322137B2 JP7322137B2 JP2021508779A JP2021508779A JP7322137B2 JP 7322137 B2 JP7322137 B2 JP 7322137B2 JP 2021508779 A JP2021508779 A JP 2021508779A JP 2021508779 A JP2021508779 A JP 2021508779A JP 7322137 B2 JP7322137 B2 JP 7322137B2
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Classifications
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- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
- C11D7/02—Inorganic compounds
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02041—Cleaning
- H01L21/02057—Cleaning during device manufacture
- H01L21/0206—Cleaning during device manufacture during, before or after processing of insulating layers
- H01L21/02065—Cleaning during device manufacture during, before or after processing of insulating layers the processing being a planarization of insulating layers
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D11/00—Special methods for preparing compositions containing mixtures of detergents
- C11D11/0094—Process for making liquid detergent compositions, e.g. slurries, pastes or gels
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D17/00—Detergent materials or soaps characterised by their shape or physical properties
- C11D17/0008—Detergent materials or soaps characterised by their shape or physical properties aqueous liquid non soap compositions
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
- C11D7/22—Organic compounds
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
- C11D7/22—Organic compounds
- C11D7/26—Organic compounds containing oxygen
- C11D7/261—Alcohols; Phenols
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
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Description
溶媒と、溶存ガスとを含み、
前記溶存ガスの濃度が総体積に対して0.01mg/L以上10mg/L以下であり、
化学的機械的研磨後の研磨済研磨対象物の表面における残渣を低減するのに用いられる、表面処理組成物。
本発明の一形態は、溶媒と、溶存ガスとを含み、前記溶存ガスの濃度が総体積に対して0.01mg/L以上10mg/L以下であり、化学的機械的研磨後の研磨済研磨対象物の表面における残渣を低減するのに用いられる、表面処理組成物に関する。本発明の一形態によれば、化学的機械的研磨後の研磨済研磨対象物の表面における残渣を低減するのに用いられる表面処理組成物において、残渣除去効果を向上させるとともに、保管安定性を向上させうる手段が提供されうる。
本発明の一形態に係る表面処理組成物において、溶存ガスの濃度は、表面処理組成物の総体積に対して0.01mg/L以上10mg/L以下である。溶存ガスの濃度が表面処理組成物の総体積に対して10mg/Lを超える場合、経時により表面処理組成物による残渣低減効果が低下する場合がある。本願明細書では、このような経時による表面処理組成物による残渣低減効果の程度を保管安定性と称し、経時による残渣低減効果の低下の度合いが小さいほど、保管安定性が良好であることを表す。また、溶存ガスの濃度が表面処理組成物の総体積に対して0.01mg/L未満である場合、残渣除去効果が不十分となる場合がある。
カラム:Porapak Q(3.0mm i.D.×2.0m、株式会社島津製作所製)、
カラム温度:140℃、
キャリアガス:ヘリウム、
流速:40mL/min、
検出器:熱電導度型検出器。
本発明の一形態に係る表面処理組成物は、溶媒(分散媒)を含む。溶媒は、各成分を分散または溶解させる機能を有する。
本発明の一形態に係る表面処理組成物は、水溶性高分子をさらに含有することが好ましい。水溶性高分子は、残渣低減効果をより向上させる機能を有する。
本発明の一形態に係る表面処理組成物は、pH調整剤をさらに含むことが好ましい。pH調整剤は、表面処理組成物のpHを所望の値とするよう作用する。
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、他の成分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、残渣の原因となりうるためできる限り含有しないことが望ましい。そのため、他の成分の含有量はできる限り少ないことが好ましく、他の成分を実質的に含有しないことが好ましく、全く含まないことがより好ましい。他の成分としては、特に制限されないが、例えば、砥粒、濡れ剤、防腐剤、還元剤、酸化剤等が挙げられる。例えば、砥粒の場合、「砥粒を実質的に含有しない」とは、表面処理組成物の総質量に対して、砥粒の含有量が0.01質量%以下である場合をいう。
本発明の一形態に係る表面処理組成物のpHの上限値は、特に制限されないが、7以下であることが好ましく、6以下であることがより好ましく、5以下であることがさらに好ましい。この範囲であると、研磨済研磨対象物の表面に金属から構成される部分を有する場合でも金属の腐食をより抑制することができ、多様な表面処理対象物(研磨済研磨対象物)が使用できるようになる。また、pHの下限値は、特に制限されないが、1以上であることが好ましく、2以上であることがより好ましく、3以上であることがさらに好ましい。この範囲であると、研磨装置や接触する研磨パッドなどの消耗部材を劣化させる可能性がより低下し、劣化により生じた生成物により、残渣の発生や、傷などが発生する可能性もより低下する。なお、表面処理組成物のpH値は、pHメータ(株式会社堀場製作所製 製品名:LAQUA(登録商標))により確認することができる。
本発明の他の一形態は、溶存ガスの濃度を総体積に対して0.01mg/L以上10mg/L以下とすることを含む、上記の表面処理組成物の製造方法に関する。
本発明の他の一形態は、上記の表面処理組成物を用いて、または、上記の表面処理組成物の製造方法で表面処理組成物を製造し、この製造された表面処理組成物を用いて、化学的機械的研磨後の研磨済研磨対象物を表面処理して、前記研磨済研磨対象物の表面における残渣を低減する、表面処理方法に関する。
本発明の他の一形態は、研磨済研磨対象物が研磨済半導体基板であり、上記の表面処理方法によって、化学的機械的研磨後の研磨済半導体基板(すなわち、化学的機械的研磨によって研磨された後の半導体基板である研磨済半導体基板:化学的機械的研磨済半導体基板)の表面における残渣を低減する表面処理工程を含む、半導体基板の製造方法に関する。
上記の表面処理組成物は、化学的機械的研磨後の研磨済研磨対象物の表面における残渣を低減するのに用いられる。
上記の表面処理組成物、表面処理方法および半導体基板の製造方法において、表面処理が施される対象は、化学的機械的研磨後の研磨済研磨対象物である。化学的機械的研磨後である理由は、上記の表面処理組成物は、化学的機械的研磨後の研磨済研磨対象物の表面における残渣、特に研磨後に残留する砥粒や研磨時に発生した水に対して不溶性の物質などからなる残渣に対して特に高い除去効果を示すからである。
本明細書において、残渣とは、研磨済研磨対象物の表面に付着した不純物を表す。残渣としては、特に制限されないが、例えば、有機物残渣、砥粒由来の残渣、研磨対象物由来の残渣、これらの混合物からなる残渣等が挙げられる。上記の表面処理組成物は、残渣の種類に関わらず高い除去効果を有するものであるが、これらの中でも、研磨後に残留する砥粒や研磨時に発生した水に対して不溶性の物質などからなる残渣に対して特に高い除去効果を示す。残渣数は、KLA TENCOR社製ウェーハ欠陥検査装置SP-2により確認することができる。また、残渣の種類によって色および形状が大きく異なることから、残渣の種類は、SEM観察によって目視にて判断することができる。また、必要に応じて、エネルギー分散型X線分析装置(EDX)による元素分析にて判断してもよい。
1.溶媒と、溶存ガスとを含み、
前記溶存ガスの濃度が総体積に対して0.01mg/L以上10mg/L以下であり、
化学的機械的研磨後の研磨済研磨対象物の表面における残渣を低減するのに用いられる、表面処理組成物;
2.pHが7以下である、上記1.に記載の表面処理組成物;
3.水溶性高分子をさらに含有する、上記1.または上記2.に記載の表面処理組成物;
4.溶存ガスの濃度を総体積に対して0.01mg/L以上10mg/L以下とすることを含む、上記1.~上記3.のいずれか1つに記載の表面処理組成物の製造方法;
5.上記1.~上記3.のいずれか1つに記載の表面処理組成物を用いて、または、
上記4.に記載の方法で表面処理組成物を製造し、この製造された表面処理組成物を用いて、
化学的機械的研磨後の研磨済研磨対象物を表面処理して、前記研磨済研磨対象物の表面における残渣を低減する、表面処理方法;
6.前記表面処理は、リンス研磨処理または洗浄処理によって行われる、上記5.に記載の表面処理方法;
7.研磨済研磨対象物が研磨済半導体基板であり、
上記5.または上記6.に記載の表面処理方法によって、化学的機械的研磨後の研磨済半導体基板の表面における残渣を低減する表面処理工程を含む、半導体基板の製造方法。
[表面処理組成物1の調製]
水溶性高分子であるポリビニルアルコール(重量平均分子量10,000、鹸化度99%)と、pH調整剤であるマレイン酸と、溶媒である水(超純水)とを混合することにより、組成物を調製した。続いて、得られた組成物を事前に、中空糸脱気モジュールである、水用脱気・給気モジュール(DIC株式会社製、SEPAREL(登録商標)EF-040P)を用いて、真空圧力を2.7kPa以下に設定し、流量1000L/hの条件で脱気して、溶存ガスの濃度を組成物の総体積に対して0.05mg/Lとした後、密閉容器である真空容器(アズワン株式会社製、小型真空容器 NT-20R)中で組成物に0.5MPaに加圧した清浄空気ガスを給気してバブリングすることで溶解させて、溶存ガスの濃度が表面処理組成物の総体積に対して10mg/Lである表面処理組成物1を得た。
カラム:Porapak Q(3.0mm i.D.×2.0m、株式会社島津製作所製)、
カラム温度:140℃、
キャリアガス:ヘリウム、
流速:40mL/min、
検出器:熱電導度型検出器。
表面処理組成物1の調製において、加圧条件(密閉容器中における清浄空気のバブリングの際の清浄空気の圧力)を変更して、溶存ガスの濃度を下記表1のように変更した以外は同様にして、表面処理組成物2~5、8をそれぞれ調製した。
表面処理組成物1の調製において、脱気条件(真空圧力および流量)を変更し、密閉容器中での清浄空気ガスによるバブリングを行わないことで、溶存ガスの濃度を下記表1のように変更した以外は同様にして、表面処理組成物6、7を調整した。
[化学的機械的研磨(CMP)工程]
半導体基板である、TEOSを原料に成膜した酸化ケイ素(TEOS-SiO2)膜を有するシリコン単結晶基板(TEOS-SiO2膜が成膜されたシリコン単結晶基板、以下、単に「TEOS-SiO2基板」とも称する)について、研磨用組成物M(組成;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、一次粒子径30nm、二次粒子径60nm)4質量%、硫酸アンモニウム1質量%、濃度30質量%のマレイン酸水溶液0.018質量%、溶媒:水)を使用し、下記の条件にて、TEOS-SiO2膜側の基板表面の研磨を行った。ここで、TEOS-SiO2基板は、300mmウェーハを使用した;
-研磨装置および研磨条件-
研磨装置:株式会社荏原製作所製 片面研磨装置 FREX300E
研磨パッド:ニッタ・ハース株式会社製 硬質ポリウレタンパッド IC1010
研磨圧力:2.0psi(1psi=6894.76Pa、以下同様)
研磨定盤回転数:63rpm
ヘッド回転数:57rpm
研磨用組成物M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。
上記CMP工程にてTEOS-SiO2膜側の基板表面を研磨した後、研磨済TEOS-SiO2基板を研磨定盤(プラテン)上から取り外した。続いて、同じ研磨装置内で、当該研磨済TEOS-SiO2基板を別の研磨定盤(プラテン)上に取り付け、下記の条件にて、上記調製した各表面処理組成物であって、調製後、使用されるまでの間、溶存ガスの濃度が変化しないよう、密閉容器である真空容器(アズワン株式会社製、小型真空容器 NT-20R中にて、25℃の環境下で保管されたものを用いて、TEOS-SiO2膜側の基板表面に対してリンス研磨処理を行った。ここで、表面処理組成物の調製完了から、密閉容器が開封されて、当該表面処理組成物が研磨機に設置され、使用されるまでの間の時間は30分以内であった;
-リンス研磨装置およびリンス研磨条件-
研磨装置:株式会社荏原製作所製 片面研磨装置 FREX300E
研磨パッド:ニッタ・ハース株式会社製 硬質ポリウレタンパッド IC1010
研磨圧力:2.0psi(1psi=6894.76Pa、以下同様)
研磨定盤回転数:63rpm
ヘッド回転数:57rpm
表面処理組成物1~8の供給:掛け流し
表面処理組成物供給量:300mL/分
リンス研磨処理時間:60秒間。
上記得られたリンス研磨処理済の研磨済TEOS-SiO2基板について、リンス研磨後、洗浄部にて、PVAブラシを用いて脱イオン水(DIW)を掛けながら、60秒間洗浄した。その後、30秒間スピンドライヤにて乾燥させた。
上記得られた水洗工程後の研磨済TEOS-SiO2基板について、0.09μm以上の欠陥数を測定した。欠陥数の測定にはKLA TENCOR社製ウェーハ欠陥検査装置SP-2を使用した。測定は、研磨済TEOS-SiO2基板の、TEOS-SiO2膜側の基板表面の外周端部から幅5mmの部分(外周端部を0mmとしたときに、幅0mmから幅5mmまでの部分)を除外した残りの部分について測定を行った。欠陥数が少ないほど、基板表面に残存する残渣数が少ないことを意味し、欠陥数は、基板製造時の歩留まりを考慮して決定した下記基準に従い評価した。これらの結果を下記表1に示す。
△:欠陥数が3,650個以上、3,900個未満である;
×:欠陥数が3,900個以上である。
上記調製した各表面処理組成物を、調製後、使用されるまでの間、溶存ガスの濃度が変化しないよう、密閉容器である真空容器(アズワン株式会社製、小型真空容器 NT-20R)中にて、25℃の環境下で6か月保管して、保管後の各表面処理組成物を準備した。
Claims (6)
- 溶媒と、溶存ガスと、水溶性高分子とを含み、
前記溶存ガスの濃度が総体積に対して0.01mg/L以上10mg/L以下であり、
化学的機械的研磨後の研磨済研磨対象物の表面における残渣を低減するのに用いられる、
表面処理組成物。 - pHが7以下である、請求項1に記載の表面処理組成物。
- 溶存ガスの濃度を総体積に対して0.01mg/L以上10mg/L以下とすることを含む、請求項1または2に記載の表面処理組成物を製造する方法。
- 請求項1または2に記載の表面処理組成物を用いて、または、
請求項3に記載の方法で表面処理組成物を製造し、この製造された表面処理組成物を用いて、
化学的機械的研磨後の研磨済研磨対象物を表面処理して、前記研磨済研磨対象物の表面における残渣を低減する、表面処理方法。 - 前記表面処理は、リンス研磨処理または洗浄処理によって行われる、請求項4に記載の表面処理方法。
- 研磨済研磨対象物が研磨済半導体基板であり、
請求項4または5に記載の表面処理方法によって、化学的機械的研磨後の研磨済半導体基板の表面における残渣を低減する表面処理工程を含む、半導体基板の製造方法。
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JP2008305900A (ja) | 2007-06-06 | 2008-12-18 | Kanto Chem Co Inc | 基板の洗浄またはエッチングに用いられるアルカリ性水溶液組成物 |
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