JP7773910B2 - 腐食保護層を有するマルチゾーンシリコン窒化物ウエハヒータアセンブリ、並びにその製造方法および使用方法 - Google Patents
腐食保護層を有するマルチゾーンシリコン窒化物ウエハヒータアセンブリ、並びにその製造方法および使用方法Info
- Publication number
- JP7773910B2 JP7773910B2 JP2021577977A JP2021577977A JP7773910B2 JP 7773910 B2 JP7773910 B2 JP 7773910B2 JP 2021577977 A JP2021577977 A JP 2021577977A JP 2021577977 A JP2021577977 A JP 2021577977A JP 7773910 B2 JP7773910 B2 JP 7773910B2
- Authority
- JP
- Japan
- Prior art keywords
- silicon nitride
- wafer
- outermost layer
- layer
- heater
- 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.)
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Classifications
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- H10P72/0432—
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B18/00—Layered products essentially comprising ceramics, e.g. refractory products
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
- C04B35/58—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides
- C04B35/584—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides based on silicon nitride
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
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- F27D5/0037—Supports specially adapted for semi-conductors
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- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/10—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor
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- H05B3/00—Ohmic-resistance heating
- H05B3/20—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater
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Description
共に粉砕した無機および有機バッチ成分を含むセラミックスリップを配合し、テープキャスティング用にシリコン疑似/せん断薄膜化する材料の作製を準備する。無機バッチ成分は、窒化ケイ素粉末(宇部、SN-ESPグレード、表面積10m2/g)を、スリップ混合物全体の52.9重量%として含み、焼結助剤を、スリップ混合物全体の約12.8重量%として含む。焼結助剤は、二酸化ケイ素(USシリカ、MIN-U-SIL)を全バッチ配合物の約2.0重量%、酸化イッテルビウム(NEO Corporation)を全バッチ配合物の約6.7重量%、二酸化モリブデン(HCスターク、グレードG)を全バッチ配合物の約4.1重量%として使用した。有機バッチ成分は、メチルエチルケトン、トルエン、シクロヘキサノンの三元溶媒系を含み、バッチ製剤全体の約17.1重量%を占めている。残りのバッチ剤には、分散剤Hypermer(登録商標)KD-1(Croda)、結合剤Paraloid(登録商標)B-72(Dow Chemical)、タイプI可塑剤Santicizer(登録商標)S-160(Valtris)、およびタイプII可塑剤UCON(登録商標)50-HB5100(Dow Chemical)が含まれる。まず、分散媒、焼結助剤、および添加物とともに、溶媒を粉砕媒体の入ったカーボイに加え、2時間粉砕を行った。その後、窒化ケイ素の粉末を時間をかけて徐々に加え、24時間粉砕した。無機物を粉砕した後、バインダーとタイプIおよびタイプIIの両方の可塑剤を、脱皮剤のシクロヘキサノンと共に添加し、粉砕した。スリップ調製の最終段階として、テープキャスティングの前に真空脱泡を行った。次に、上述のスリップを従来のテープキャスティング機でキャストして、ヒータ構造におけるターゲット層の所望の厚さに応じて、0.46mm(0.018インチ)と1.27mm(0.050インチ)との間の所望の厚さの窒化ケイ素グリーンテープを作製した。テープが乾燥したら、さらなる処理のためにシートに切断した。
上述のE1S1の手順に従って、第2の試料(E1S2)を作製し、窒化ケイ素本体と埋め込み金属WC層を通る断面スライスを作製、研磨し、SEMで微細構造の品質を観察した。図12に後方散乱モードで400倍の倍率で示された微細構造について観察されたように、窒化ケイ素ヒータ基板1210は、金属層1240との界面1250またはその付近に欠陥がなく、緻密で気孔がないものであることが分かった。基板1210は、窒化ケイ素の細粒、ケイ化モリブデン、およびガラス相の混合物で構成されていた。また、発熱体層と相互接続層とを含む金属層1240は緻密であった。発熱体層と絶縁体との界面1250には、気孔やクラックなどの欠陥はなかった。ヒータ基板のX線回折は、α-Si3N4(53重量%)、β-Si3N4(27重量%)、Yb2Si2O7(10.6重量%)およびMo4.8Si3C0.6(4重量%)、SiCN(2.4重量%)、Si2N2O(2重量)およびMoSi2(1重量%)があることが示唆された。金属層のX線回折から、存在する主な相は、α-Si3N4、β-Si3N4、Yb2Si2O7、およびWCであることが示された。
比較例(C1.1)は、テープキャスティングに用いるスラリー中の窒化ケイ素製剤にCTE調整剤としてのモリブデンシリサイドを添加しなかった以外は、実施例1に従って作製した。その代わりに、窒化ケイ素粉末の配合量を4.1重量%だけ増加させた。SEMにより1000倍の倍率で分析した図13に示すように、断面微細構造を参照すると、窒化ケイ素ヒータ基板1310は、窒化ケイ素の細粒とガラス相との混合物からなる緻密なものであった。また、金属層(発熱体層1340)も緻密であった。しかし、発熱体層1340とヒータ基板1310との界面1350は、気孔率Pが大きく、クラックCも見受けられた。
実施例2(E2)は、実施例1に準じて、ヒータ基板の最外層に腐食防止層を追加して作製したものである。非多孔性最外層を形成するための腐食防止層は、ヒータ基板との共焼成を含む緻密化時にその場で形成する単相のイッテルビウムジシリケートを目標とした。酸化物から出発し、イッテルビウムとシリカの粉末を使用して、焼結時にイットリウムジシリケートを形成するためのグリーン最外層を作製することができた。
比較例(C2.1)は、腐食防止層作製用セラミックスリップを、SiO2:Yb2O3モル比1.6とした以外は、実施例2と同様にして作製した。ウエハヒータ作製後、焼成を行い、断面の検査を終了した。XRDにより、最外層にYb2SiO5とYb2O3の相が存在することが確認された。C2.1の腐食防止層は下地の窒化ケイ素ヒータ基板によく接着しているように見えるが、最外層は粒界に多数のクラックを有する微細構造であることが確認された。このような欠陥は、最外層に存在する異なる相の間のCTEおよび/または収縮挙動の不一致に起因していると思われる。
比較例(C2.2)は、最外層を作製するためのセラミックスリップがSiO2:Yb2O3モル比3.0であったこと以外は、実施例2と同様に作製した。XRDにより、最外層にYb2Si2O7とSiO2が存在することが確認され、本製剤がシリカリッチであることが示された。C2.2の腐食防止層は、下にある窒化ケイ素ヒータ基板によく結合しているように見えるが、最外層はSiO2の多数の孔および介在物を有する微細構造を示した。
最外層を作製するためのセラミックスリップが、予め反応させたイッテルビウムジシリケート(Yb2Si2O7)粉末を含むことを除いて、実施例3(E3)は、実施例2と同様に作製された。d50が1.2μmで表面積が4.2m2/gのイッテルビウムジシリケート粉末(Trans-Tech Ceramics and Advanced Materials、 Adamstown、MD、USA)を窒化ケイ素ヒータ基板に積層し、窒素中で1630℃、20MPaでホットプレス成形した。
窒化ケイ素ヒータ基板上のYb2Si2O7粉末ベースの最外層を、実施例2と同様にホットプレスして、直径28.6mm(1.125インチ)のパックを形成した。この試料E5の断面を研磨し、比較のための参照試料である研磨AlNおよび研磨Si3N4試料とともに、適切なエッチマスクを配置してプラズマエッチリアクタに入れた。
本開示の多くの変形および修正を使用することができる。他のものを提供することなく、本開示のいくつかの特徴を提供することが可能であろう。
Claims (25)
- ウエハヒータアセンブリであって、
窒化物を含むヒータ基板であって、その中に埋め込まれた少なくとも1つの加熱要素を含み、第1表面を有するヒータ基板、および、
ヒータ基板の第1表面に関連する非多孔質性最外層であって、ケービアイト結晶構造を有する希土類(RE)ジシリケート(RE2Si2O7)を含み、REはYbおよびYの1つであり、第1表面とは反対側の露出表面を含み、露出表面は加熱のためにウエハに接触するように構成された非多孔質性最外層、を含むウエハヒータアセンブリ。 - 非多孔質性最外層の希土類ジシリケートは、イッテルビウムジシリケート(Yb2Si2O7)を含む請求項1に記載のウエハヒータアセンブリ。
- 非多孔質性最外層の少なくとも50体積%は、ケービアイト結晶構造を有する希土類ジシリケートを含む、または非多孔質性最外層の少なくとも95体積%は、ケービアイト結晶構造を有する希土類ジシリケートを含む請求項1に記載のウエハヒータアセンブリ。
- 最外層のX線回折は、ケービアイト020強度の95%未満のケービアイト001ピーク強度を示す請求項1に記載のウエハヒータアセンブリ。
- ヒータ基板と非多孔質性最外層との間に位置する界面であって、5体積%以下の空隙率を含む界面をさらに含む請求項1に記載のウエハヒータアセンブリ。
- ヒータ基板は、少なくとも10体積%のβ-窒化ケイ素(β-Si3N4)、または少なくとも50体積%のβ-窒化ケイ素(β-Si3N4)、または少なくとも90体積%のβ-窒化ケイ素(β-Si3N4)を含む請求項1に記載のウエハヒータアセンブリ。
- ヒータ基板のX線回折スペクトルは、β-窒化ケイ素(β-Si3N4)200ピーク強度の95%未満であるβ-窒化ケイ素(β-Si3N4)101ピーク強度を示す請求項1に記載のウエハヒータアセンブリ。
- 非多孔質性最外層の平均粒径は、0.1μm(マイクロメートル)から100μm(マイクロメートル)、または非多孔質性最外層の平均粒径は、0.1μm(マイクロメートル)から10μm(マイクロメートル)である請求項1に記載のウエハヒータアセンブリ。
- 最外層の厚さは、0.5mmから10mmである請求項8に記載のウエハヒータアセンブリ。
- ヒータ基板の平均粒径は、0.05μm(マイクロメートル)から5μm(マイクロメートル)である請求項1に記載のウエハヒータアセンブリ。
- ヒータ基板の厚さは、少なくとも5mmである請求項10に記載のウエハヒータアセンブリ。
- ヒータ基板の窒化物は、窒化ケイ素、窒化アルミニウム、およびそれらの組み合わせからなる群から選択される請求項1に記載のウエハヒータアセンブリ。
- ヒータ基板は、熱膨張係数調整剤を含む請求項1に記載のウエハヒータアセンブリ。
- ウエハヒータアセンブリを形成する方法であって、
少なくとも1つの添加物と、窒化ケイ素、窒化アルミニウム、およびそれらの組み合わせからなる群から選択される窒化物とを含む第1層材料を準備する工程;
第1層材料を少なくとも1つの加熱要素に適用し、それによってプレラミネートを形成する工程であって、ドライプレス、冷間静水圧プレス、ロール成形、またはテープキャスティングに続くラミネート、およびこれらの組み合わせを含む工程;および、
1500℃から1900℃の温度でプレラミネートを焼結する工程;を含むウエハヒータアセンブリを形成する方法。 - 少なくとも1つの添加物は、希土類酸化物、アルカリ土類酸化物、アルミナ、シリカ、リチウム化合物、フッ素化合物、炭化ケイ素、窒化ホウ素、耐火金属、または耐火金属化合物からなる群から選択される請求項14に記載の方法。
- 第1層材料は、60から99モル%の窒化物を含む請求項14に記載の方法。
- 窒化物は、少なくとも窒化ケイ素を含み、窒化ケイ素は、85から100重量%のα相窒化ケイ素と、1重量%以下の不可避不純物を含み、残部がβ相窒化ケイ素である請求項16に記載の方法。
- 第1層材料は、1~10モル%の希土類酸化物を含み、希土類酸化物は、セリウム(Ce)、ジスプロシウム(Dy)、エルビウム(Er)、ユーロピウム(Eu)、ガドリニウム(Gd)、ホルミウム(Ho)、ランタン(La)、ルテチウム(Lu)、ネオジム(Nd)、プラセオジム(Pr)、プロメチウム(Pm)、サマリウム(Sm)、スカンジウム(Sc)、テルビウム(Tb)、ツリウム(Tm)、イッテルビウム(Yb)、イットリウム(Y)、およびそれらの組み合わせの酸化物である請求項16に記載の方法。
- 第1層材料は、0モル%より大きく20モル%までのシリカを含む請求項18に記載の方法。
- 第1層材料は、1から30重量%の有機材料を含む請求項19に記載の方法。
- 第1層材料は、0.5から15体積%の熱膨張係数調整剤を含む請求項19に記載の方法。
- さらに、焼結工程の前に、150℃から650℃の温度でプレラミネートを熱処理する工程を含む請求項14に記載の方法。
- 非多孔質性最外層の希土類ジシリケートは、本質的にイッテルビウムジシリケート(Yb 2 Si 2 O 7 )からなる請求項1に記載のウエハヒータアセンブリ。
- 非多孔質性最外層の希土類ジシリケートは、イッテルビウムジシリケート(Yb 2 Si 2 O 7 )からなる請求項1に記載のウエハヒータアセンブリ。
- 焼結工程は、1550℃から1900℃の温度でプレラミネートを焼結する工程である請求項14に記載の方法。
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| US62/908,441 | 2019-09-30 | ||
| PCT/US2020/040532 WO2021003292A1 (en) | 2019-07-01 | 2020-07-01 | Multi-zone silicon nitride wafer heater assembly having corrosion protective layer, and methods of making and using the same |
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| WO2022072382A1 (en) * | 2020-09-29 | 2022-04-07 | Lam Research Corporation | Coated conductor for heater embedded in ceramic |
| US12062565B2 (en) * | 2021-06-29 | 2024-08-13 | Asm Ip Holding B.V. | Electrostatic chuck, assembly including the electrostatic chuck, and method of controlling temperature of the electrostatic chuck |
| KR102855587B1 (ko) * | 2022-02-08 | 2025-09-05 | 주식회사 아모센스 | 세라믹 히터 플레이트 제조방법, 이를 통해 제조된 세라믹 히터 플레이트 및 이를 포함하는 반도체 유지장치 |
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| CN119569452B (zh) * | 2024-11-11 | 2025-08-29 | 四川研瑞电子科技有限公司 | 一种高抗热震性能的毫米波介质陶瓷材料及其制备方法 |
| KR102908750B1 (ko) * | 2024-12-18 | 2026-01-09 | (주)보부하이테크 | 발열요소를 코팅처리한 AlN 히터의 제조방법 |
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| JP2000173749A (ja) | 1998-12-03 | 2000-06-23 | Ngk Spark Plug Co Ltd | セラミックヒータ用発熱抵抗体及びセラミックヒータ並びにセラミックヒータの製造方法 |
| JP2003342074A (ja) | 2002-05-24 | 2003-12-03 | Kyocera Corp | 耐食性部材 |
| JP2008511179A (ja) | 2004-08-24 | 2008-04-10 | サン−ゴバン セラミックス アンド プラスティクス,インコーポレイティド | 半導体処理の構成材およびそれを用いた半導体の処理 |
| JP2018002556A (ja) | 2016-07-04 | 2018-01-11 | 三菱電機株式会社 | セラミック複合体、飛翔体用レドーム、セラミック複合体の製造方法及び飛翔体用レドームの製造方法 |
| WO2018093414A1 (en) | 2016-11-16 | 2018-05-24 | Coorstek, Inc. | Corrosion-resistant components and methods of making |
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| JP2022538888A (ja) | 2022-09-06 |
| WO2021003292A1 (en) | 2021-01-07 |
| KR20220031913A (ko) | 2022-03-14 |
| EP3994002A1 (en) | 2022-05-11 |
| CN114340896A (zh) | 2022-04-12 |
| KR102914579B1 (ko) | 2026-01-19 |
| US20210005480A1 (en) | 2021-01-07 |
| CN114340896B (zh) | 2024-04-02 |
| EP3994002A4 (en) | 2023-07-26 |
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