JP2022514787A - 研磨組成物およびそれを使用する方法 - Google Patents
研磨組成物およびそれを使用する方法 Download PDFInfo
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- JP2022514787A JP2022514787A JP2021536263A JP2021536263A JP2022514787A JP 2022514787 A JP2022514787 A JP 2022514787A JP 2021536263 A JP2021536263 A JP 2021536263A JP 2021536263 A JP2021536263 A JP 2021536263A JP 2022514787 A JP2022514787 A JP 2022514787A
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- 238000005498 polishing Methods 0.000 title claims abstract description 175
- 239000000203 mixture Substances 0.000 title claims abstract description 168
- 238000000034 method Methods 0.000 title claims description 37
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 66
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- 239000002253 acid Substances 0.000 claims abstract description 17
- ABLZXFCXXLZCGV-UHFFFAOYSA-N Phosphorous acid Chemical group OP(O)=O ABLZXFCXXLZCGV-UHFFFAOYSA-N 0.000 claims abstract description 9
- 125000001183 hydrocarbyl group Chemical group 0.000 claims abstract description 8
- 125000002947 alkylene group Chemical group 0.000 claims abstract description 7
- QAOWNCQODCNURD-UHFFFAOYSA-L sulfate group Chemical group S(=O)(=O)([O-])[O-] QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims abstract description 6
- 150000007942 carboxylates Chemical group 0.000 claims abstract description 5
- 125000002467 phosphate group Chemical group [H]OP(=O)(O[H])O[*] 0.000 claims abstract description 5
- 125000001273 sulfonato group Chemical group [O-]S(*)(=O)=O 0.000 claims abstract description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 159
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 137
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- 125000004836 hexamethylene group Chemical group [H]C([H])([*:2])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[*:1] 0.000 description 1
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- C09G1/00—Polishing compositions
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- 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
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/3105—After-treatment
- H01L21/31051—Planarisation of the insulating layers
- H01L21/31053—Planarisation of the insulating layers involving a dielectric removal step
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- C09K3/1463—Aqueous liquid suspensions
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- H01L21/304—Mechanical treatment, e.g. grinding, polishing, cutting
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- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
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- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
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Abstract
Description
本出願は、2019年3月18日に出願された米国実用出願シリアル番号16/ 356,685に優先権を主張し、2018年12月19日に出願された米国仮出願第62/781,648に優先権を主張し、その内容は、その全体が参照により本明細書に組み込まれる。
ここで、m は1 ~3 の整数、n は1 ~10 の整数、X はAl、Si、Ti、またはZrであり、Y はカチオン性アミノ基またはチオール基である。別の例として、アニオン性研磨剤は、式(I)の末端基を含むことができる:
ここで、m は1 ~3 の整数、n は1 ~10 の整数、X はAl、Si、Ti、またはZrであり、Y は酸基である。いくつかの実施形態において、少なくとも1つの研磨剤は組成物の総重量に基づいて、本明細書に記載の研磨組成物中に少なくとも約0.05重量%(例えば、少なくとも約0.1重量%、少なくとも約0.5重量%、少なくとも約1重量%、少なくとも約2重量%、少なくとも約3重量%、または少なくとも約5重量%)~最大約20重量%(例えば、最大約15重量%、最大約10重量%、最大約8重量%、最大約6重量%、最大約4重量%、または最大約2重量%)の量で存在することができる。
この実施例では、サンプル1A~1Fで使用された研磨組成物が主に、3w/w%の中性コロイドシリカ研磨剤、pH調整剤としてのマロン酸、窒化物除去速度低減剤(存在する場合)、および液体キャリアとしての水を含んでいた。研磨組成物のpHは2.3であった。Dow VP6000パッド200mm酸化シリコン(TEOS)および窒化シリコン(SiN)ブランケットウェハー上で研磨するために、Applied Materials Mirra CMPポリッシャを2psiのダウンフォースおよび175mL/minの流速で使用した。
この実施例では、サンプル2A~2Iで使用した研磨組成物が3w/w%のコロイド状シリカ研磨剤、pH調整剤としての有機酸、n-オクタデシルホスホン酸、および液体キャリアとしての水を含んでいた。n-オクタデシルホスホン酸は、本明細書に記載の窒化物除去速度低減剤のクラスの代表例である。さらに、この実施例では、表2に示すように、中性、カチオン性、およびアニオン性シリカを使用することによって、コロイド状シリカの電荷を変化させた。研磨組成物のpHは、約2.25から約4.25まで変化させた。Applied Materials Mirra CMPポリッシャを、200mm酸化シリコン(TEOS)および窒化シリコンブランケットウェハーを研磨するために、Dow VP6000パッド上で2psiのダウンフォースおよび175mL/minの流速で使用した。
この実施例では、試料3A~3Lで使用した研磨組成物が3w/w%のコロイダルシリカ研磨剤、pH調整剤としてのマロン酸、表3に示す窒化物除去速度低減剤、および液体キャリアとしての水を含んでいた。研磨組成物のpHは2.25であった。具体的には、サンプル3A~3Lで使用された窒化物除去速度低減剤が表3に記載されたヘッドタイプおよび疎水性物質を含み、アルキレンオキシド基は全く含まなかった。さらに、サンプル3I、3J、および3Kで使用された窒化物除去速度低減剤は界面活性剤の混合物を含み、ラウリル/リン酸ミリスチル、リン酸ステアリル、およびリン酸ラセリルがそれぞれ主成分であった。
この実施例では、サンプル4A~4Cで使用される研磨組成物が3w/w%コロイダルシリカ研磨剤、pH調整剤としての有機酸、n-オクタデシルホスホン酸、および液体担体としての水を含んだ。研磨組成物のpHは2~6.5であった。Applied Materials Mirra CMP研磨機を、2、3、および4psiのダウンフォースおよび175mL/分の流速で、Dow IC1010パッド上で使用して、200mm高密度プラズマ(HDP)酸化ケイ素、オルトケイ酸テトラエチル(TEOS)、ホウリンケイ酸ガラス(BPSG)、および窒化ケイ素被覆ウェハーを研磨した。
この実施例では、試料5A~5Cで使用した研磨組成物が3w/w%のコロイダルシリカ研磨剤、pH調整剤としての有機酸、窒化物除去速度低減剤、および液体キャリアとしての水を含んでいた。研磨組成物のpHは2~6.5であった。Applied Materials Mirra CMP研磨機を、2psiのダウンフォースおよび175mL/分の流速で、Dow VP6000またはFujibo H800パッド上で使用して、200mmのオルトケイ酸テトラエチル(TEOS)および窒化ケイ素(SiN)ブランケットウェハーを研磨した。
この実施例では、試料6A~6Dで使用される研磨組成物が3w/w%コロイダルシリカ研磨剤、pH調整剤としての有機酸、n-オクタデシルホスホン酸、アニオン性ディッシング低減ポリマー(存在する場合)、および液体キャリアとしての水を含んだ。研磨組成物のpHは3.0であった。Applied Materials Mirra CMPポリッシャを、ダウンフォース2psi、流量175mL/minでDow VP6000パッド上に用いて、200mm STI 1酸化シリコン/窒化シリコンパターン形成ウェハーを研磨した。約50秒、20秒の過研磨後、レーザ測定によりウェハーを先端に向けた。
この実施例では、試料7A~7Cで使用される研磨組成物が3w/w%中性コロイダルシリカ研磨剤、pH調整剤としての有機酸および/または水酸化カリウム、n-オクタデシルホスホン酸、および液体担体としての水の使用点配合に対応する濃縮物を含んだ。単一ポット溶液は研磨に必要な全ての成分を含有し、一方、二液系は、有機酸を除く全ての成分を含有した。平均粒径(MPS)はスラリー安定性の信頼できる指標である。不安定なシステムでは、粒子は時間の経過と共に凝集し、測定可能なMPS成長を引き起こす。動的光散乱法を用いてMalvernツール上でMPSを測定した。スラリーを60℃に設定したオーブン中に貯蔵し、7日毎に測定した。加速老化試験のためのArrhenius関係によると、21日間の完全な試験運転は、室温老化のおよそ1年に相当する。言い換えれば、スラリーを60℃で21日間保持し、シリカのMPSがあまり成長しない場合、スラリーが1年のリアルタイム貯蔵寿命/有効期限を有することを証明することができる。
本実施例では表1、3、5に示すコロイド状シリカ研磨剤と窒化物除去速度低減剤を含有する試料8A、8B、8Cに用いた研磨組成物を用いて、図2に示すように、パターニングされた窒化ケイ素が高密度酸化ケイ素で充填された200mmのSTIパターニングされたウェハーを研磨した。窒化ケイ素中のパターンは幅広いラインスペース、正方形、チェッカー、および密度の異なるメッシュアレイのアレイがウェハー面全体にわたって配列されるようなものであった。
この例では、エンドポイントでの酸化ケイ素ディッシング/ステップ高さおよび窒化ケイ素エロージョン/ロスを定量化するために、実施例8で使用されたものと同様のパターン化されたウェハーがPark Systems AFMツールで測定された。試料9A、9Bに用いた研磨組成物は表1、3、5に示す窒化物除去速度低減剤を含有しており、図2にその積層を描いたパターンウェハーの研磨に用いた。酸化シリコンディッシング/ステップ高さおよび窒化シリコンエロージョン/ロスの結果を表9に示す。平坦化効率(PE)はパーセンテージで報告され、酸化ケイ素ステップ高さの変化を研磨中に除去された酸化物の量で割り、次に100を掛けたもの(パーセンテージに変換するため)に等しい。
この実施例では、実施例8および9で使用したものと同様のパターン化ウェハーの欠陥を、市販のセリアベースのSTI配合物および実施例8で説明した組成物8A(窒化物除去速度低減剤を含有するシリカベースの研磨組成物である)を使用することによって、KLA-AIT XUV欠陥カウンタツールで測定した。組成物8Aを用いることによって研磨されたウェハーに関するウェハーマップを図3に示す。市販のセリア系STI研磨組成物を用いて研磨したウェハーのウェハーマップを図4に示す。
Claims (24)
- 少なくとも1つの研磨剤;
C12からC40の炭化水素基を含む疎水性部分と親水性部分とを含み、前記疎水性部分および前記親水性部分が0から10のアルキレンオキシド基によって分離されている、少なくとも1つの窒化物除去速度低減剤;
酸または塩基;および
水;
を含み、約2~約6.5のpHを有し、少なくとも酸化ケイ素で覆われた少なくとも窒化ケイ素パターンを含むパターン化ウェハーを研磨するときに、少なくとも約3:1の酸化ケイ素の除去速度対窒化ケイ素の除去速度の比を有する、研磨組成物。 - 前記疎水性部分がC14からC32の炭化水素基を含む、請求項1に記載の研磨組成物。
- 前記疎水性部分がC16からC22の炭化水素基を含む、請求項1に記載の研磨組成物。
- 前記親水性部分が亜硫酸基、硫酸基、スルホン酸基、カルボン酸基、リン酸基およびホスホネート基からなる群より選択される少なくとも1つの基を含む、請求項1に記載の研磨組成物。
- 前記親水性部分がリン酸基またはホスホネート基を含む、請求項1に記載の研磨組成物。
- 前記少なくとも1つの窒化物除去速度低減剤が、ナフタレンスルホン酸-ホルマリン縮合物、リン酸ラウリル、リン酸ミリスチル、リン酸ステアリル、オクタデシルホスホン酸、リン酸オレイル、リン酸ベヘニル、硫酸オクタデシル、リン酸ラッセリル、オレイス-3-フォスフェート、およびオレイス-10-フォスフェートからなる群より選択される、請求項1に記載の研磨組成物。
- 前記少なくとも1つの研磨剤が、アルミナ、シリカ、チタニア、セリア、ジルコニア、それらの共形成生成物、被覆研磨剤、表面改質研磨剤、およびそれらの混合物からなる群より選択される、請求項1に記載の研磨組成物。
- 前記少なくとも1つの研磨剤が、カチオン性研磨剤、本質的に中性の研磨剤、及びアニオン性研磨剤からなる群より選択される、請求項1に記載の研磨組成物。
- 前記研磨剤が、シリカ系研磨剤である、請求項1に記載の研磨組成物。
- さらに、少なくとも1つのディッシング低減剤を含み、
前記少なくとも1つのディッシング低減剤は、ヒドロキシル基、スルフェート基、ホスホネート基、ホスフェート基、スルホネート基、アミン基、ニトレート基、ニトライト基、カルボキシレート基、およびカーボネート基からなる群より選択される少なくとも1つの基を含む化合物である、請求項1に記載の研磨組成物。 - 前記少なくとも1つのディッシング低減剤が、多糖類および置換多糖類からなる群より選択される少なくとも1つである、請求項10に記載の研磨組成物。
- 少なくとも酸化ケイ素で覆われた少なくとも窒化ケイ素パターンを含むパターン化ウェハーを研磨するときに、前記研磨組成物が、少なくとも約4:1の酸化ケイ素の除去速度対窒化ケイ素の除去速度の比を有する、請求項1に記載の研磨組成物。
- 窒化ケイ素に対する酸化ケイ素の除去速度の選択性が少なくとも約5:1であり、多くとも約1000:1である、請求項1に記載の研磨組成物。
- 前記組成物は酸化ケイ素のディッシングが多くとも約1000Åであり、および少なくとも約0Åである、請求項1に記載の研磨組成物。
- 前記組成物は酸化ケイ素のディッシングが多くとも約375Åである、請求項1に記載の研磨組成物。
- 前記組成物は窒化ケイ素の浸食が多くとも約500Åであり、少なくとも約0Åである、請求項1に記載の研磨組成物。
- 前記組成物は窒化ケイ素の浸食が多くとも約75Åである、請求項1に記載の研磨組成物。
- 前記組成物は平坦化効率が少なくとも約14%である、請求項1に記載の研磨組成物。
- 前記組成物は平坦化効率が少なくとも約14%であり、多くとも100%である、請求項1に記載の研磨組成物。
- 前記組成物を用いてパターン化ウェハーを研磨するとき、前記組成物は直径約300mmのパターン化ウェハー上に多くとも175の欠陥を生成する、請求項1に記載の研磨組成物。
- 少なくとも窒化ケイ素および少なくとも酸化ケイ素を有する基板の表面上に、請求項1に記載の研磨組成物を適用すること、
パッドを前記基板の表面と接触させ、前記基板に対して前記パッドを移動させること、を含む方法。 - 前記窒化ケイ素および前記酸化ケイ素のうちの少なくとも1つが、炭素、窒素、酸素、および水素からなる群より選択される少なくとも1つのドーパントでドープされる、請求項21に記載の方法。
- 前記基板から半導体デバイスを形成することをさらに含む、請求項21に記載の方法。
- 前記基板から半導体デバイスを形成することをさらに含む、請求項22に記載の方法。
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KR102303865B1 (ko) | 2021-09-17 |
TWI749324B (zh) | 2021-12-11 |
CN114736612B (zh) | 2023-09-26 |
EP3670620B1 (en) | 2023-10-11 |
US20220375758A1 (en) | 2022-11-24 |
US20200203172A1 (en) | 2020-06-25 |
EP3670620A1 (en) | 2020-06-24 |
CN114736612A (zh) | 2022-07-12 |
US20200343098A1 (en) | 2020-10-29 |
KR20200077373A (ko) | 2020-06-30 |
CN111334193B (zh) | 2022-05-24 |
US10763119B2 (en) | 2020-09-01 |
TW202024286A (zh) | 2020-07-01 |
SG11202106585UA (en) | 2021-07-29 |
WO2020131155A1 (en) | 2020-06-25 |
CN111334193A (zh) | 2020-06-26 |
US11424131B2 (en) | 2022-08-23 |
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