JP2008235857A - 薄膜プロセスの方法 - Google Patents
薄膜プロセスの方法 Download PDFInfo
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- JP2008235857A JP2008235857A JP2007317210A JP2007317210A JP2008235857A JP 2008235857 A JP2008235857 A JP 2008235857A JP 2007317210 A JP2007317210 A JP 2007317210A JP 2007317210 A JP2007317210 A JP 2007317210A JP 2008235857 A JP2008235857 A JP 2008235857A
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- 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
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/67005—Apparatus not specifically provided for elsewhere
- H01L21/67242—Apparatus for monitoring, sorting or marking
- H01L21/67253—Process monitoring, e.g. flow or thickness monitoring
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- 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
- H01L21/04—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
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- 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
- H01L21/04—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
- H01L21/311—Etching the insulating layers by chemical or physical means
- H01L21/31105—Etching inorganic layers
- H01L21/31111—Etching inorganic layers by chemical means
- H01L21/31116—Etching inorganic layers by chemical means by dry-etching
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- H—ELECTRICITY
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- 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
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/76—Making of isolation regions between components
- H01L21/762—Dielectric regions, e.g. EPIC dielectric isolation, LOCOS; Trench refilling techniques, SOI technology, use of channel stoppers
- H01L21/76224—Dielectric regions, e.g. EPIC dielectric isolation, LOCOS; Trench refilling techniques, SOI technology, use of channel stoppers using trench refilling with dielectric materials
- H01L21/76232—Dielectric regions, e.g. EPIC dielectric isolation, LOCOS; Trench refilling techniques, SOI technology, use of channel stoppers using trench refilling with dielectric materials of trenches having a shape other than rectangular or V-shape, e.g. rounded corners, oblique or rounded trench walls
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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
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02109—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates
- H01L21/02112—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer
- H01L21/02123—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing silicon
- H01L21/02164—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing silicon the material being a silicon oxide, e.g. SiO2
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- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02109—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates
- H01L21/02112—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer
- H01L21/02123—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing silicon
- H01L21/0217—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing silicon the material being a silicon nitride not containing oxygen, e.g. SixNy or SixByNz
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- Formation Of Insulating Films (AREA)
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Abstract
【解決手段】半導体構造を形成するための方法が、基板の表面にわたって複数の特徴部を形成するステップであって、少なくとも1つの空間が2つの隣接する特徴部間にあるステップを含む。第1の誘電層が該特徴部上かつ該少なくとも1つの空間内に形成される。該第1の誘電層の一部が、第1の前駆体および第2の前駆体から導出された反応剤と相互作用し、第1の固体生成物を形成する。該第1の固体生成物は分解されて、該第1の誘電層の該一部を実質的に除去する。第2の誘電層が形成されて、該少なくとも1つの空間を実質的に充填する。
【選択図】図2
Description
[0037]図1A〜図1Dは、例示的浅型トレンチ分離構造を形成するための例示的プロセス方法を示す概略図である。図2は、例示的浅型トレンチ分離構造を形成するステップの例示的フローチャートを示す概略図である。
[0045]一部の実施形態では、誘電層120は酸化シリコン層であってもよい。第1の前駆体は、例えば水素(H2)、アンモニア(NH3)、ヒドラジン(N2H4)、アジ化水素酸(HN3)、他の水素含有前駆体およびこれらの種々の組み合わせであってもよい。第2の前駆体は、例えば三フッ化窒素(NF3)、四フッ化シリコン(SiF4)、テトラフルオロメタン(CF4)、フッ化メタン(CH3F)、ジフルオロメタン(CH2F2)、トリフルオロメタン(CHF3)、オクタフルオロプロパン(C3F8)、ヘキサフルオロエタン(C2F6)、他のフッ素含有前駆体やこれらの種々の組み合わせであってもよい。一部の実施形態では、アンモニア(NH3)などの第1の前駆体および三フッ化窒素(NF3)などの第2の前駆体はプラズマとしてイオン化可能である。一部の実施形態では、イオン化プロセスは、誘電層120を堆積するチャンバ内で実行可能である。一部の実施形態では、イオン化プロセスは外部発生されて、誘電層120を堆積するチャンバに導入されることが可能である。一部の実施形態では、エッチングプロセス130は、堆積チャンバとは異なるエッチングチャンバ内で実行可能である。一部の実施形態では、エッチングプロセス130は、トレンチ115bの傾斜側壁とトレンチ115bの底部間の角度を87°以下に形成してもよい。
NH3(g)+NF3(g)→NH4F(s)および/またはNH4Fy.HF(s)
[0047]反応剤NH4F(s)および/またはNH4Fy.HF(s)は、その後、酸化シリコン層の一部と相互作用するように導入可能である。反応剤NH4F(s)および/またはNH4Fy.HF(s)は、酸化シリコンと相互作用して、個体生成物、例えば(NF4)2SiF6を形成することもある。基板100が、約−100℃〜約1,000℃(例えば、約−50℃〜約200℃)の温度を有するペデスタル上に配置される実施形態もある。ペデスタルが約30℃の温度を有することもある実施形態もある。ペデスタルの温度は望ましくは、プラズマおよび窒化シリコンの相互作用を高めることもある。酸化シリコンと反応剤NH4F(s)および/またはNH4Fy.HF(s)の相互作用は以下の式として記述することが可能である:
NH4F(s)および/またはNH4Fy.HF(s)+SiO2(s)→(NF4)2SiF6(s)+H2O
[0048]再度図2を参照すると、ステップ240は固体生成物(NF4)2SiF6を分解することができる。一部の実施形態では、ステップ240は、固体生成物を熱処置して、固体生成物(NF4)2SiF6を実質的に昇華するステップを含むことができる。一部の実施形態では、熱プロセスは、固体生成物(NF4)2SiF6をシャワーヘッドに近づけることによって実施されてもよく、これは約−100℃〜約1,000℃(例えば、約−50℃〜約200℃)のプロセス温度を提供するように動作可能であってもよい。プロセス温度が約180℃である実施形態もある。熱プロセスが、例えばオーブン、炉、高速熱アニーリング(RTA)装置、あるいは他の熱装置によって実施されてもよい実施形態もある。固体生成物(NF4)2SiF6の分解および/または昇華は以下の式として記述することが可能である:
(NF4)2SiF6(s)→SiF4(g)+NH3(g)+HF(g)
[0049]固体生成物を除去するための方法のさらなる実施形態は、生成物を熱処置によって昇華させるのではなく、水溶液(例えば純水)によって生成物含有基板をリンスするステップを含んでもよい。基板はまた、水溶液リンスではなく(またはこれに加えて)エタノールやグリコールなどの極性溶媒でリンスされてもよい。
[0050]一部の実施形態では、誘電層120は酸化シリコン層であってもよい。第1の前駆体は、例えば水素(H2)、アンモニア(NH3)、ヒドラジン(N2H4)、アジ化水素酸(HN3)、他の水素含有前駆体およびこれらの種々の組み合わせであってもよい。第2の前駆体は、例えばフッ化水素(HF)、三フッ化窒素(NF3)、四フッ化ケイ素(SiF4)、テトラフルオロメタン(CF4)、フルオロメタン(CH3F)、ジフルオロメタン(CH2F2)、トリフルオロメタン(CHF3)、オクタフルオロプロパン(C3F8)、ヘキサフルオロエタン(C2F6)、他のフッ素含有前駆体またはこれらの種々の組み合わせであってもよい。一部の実施形態では、アンモニア(NH3)などの第1の前駆体およびフッ化水素(HF)などの第2の前駆体は、誘電層120と相互作用するために使用可能である。一部の実施形態では、NH3およびHFは、誘電層120を堆積するチャンバ内に導入可能である。一部の実施形態では、NH3およびHFは、誘電層120と相互作用するために、堆積チャンバとは異なるエッチングチャンバ内に導入可能である。
NH3(g)+HF(g)→NH4F(s)および/またはNH4Fy.HF(s)
[0052]一部の実施形態では、NH3およびHFは、酸化シリコン層の一部と相互作用するためにチャンバに導入可能である。NH3およびHFは酸化シリコンと相互作用して、固体生成物、例えば(NF4)2SiF6(s)を形成してもよい。基板100が、約−100℃〜約1,000℃(例えば、約−50℃〜約200℃)の温度を有するペデスタル上に配置される実施形態もある。ペデスタルが約30℃の温度を有することもある実施形態もある。ペデスタルの温度は望ましくは、プラズマおよび窒化シリコンの相互作用を高めることがある。酸化シリコンおよびプラズマの相互作用は以下の式として記述可能である:
NH4F(s)および/またはNH4Fy.HF(s)+SiO2(s)→(NF4)2SiF6(s)+H2O
[0053]再度図2を参照すると、ステップ240は、固体生成物(NF4)2SiF6を分解することができる。一部の実施形態では、ステップ240は、固体生成物を熱処置して、固体生成物(NF4)2SiF6を実質的に昇華させるステップを含むことができる。一部の実施形態では、熱プロセスは、固体生成物(NF4)2SiF6をシャワーヘッドに近づけることによって実施されてもよく、これは、約−100℃〜約1,000℃(例えば、約−50℃〜約200℃)のプロセス温度を提供するように動作可能であってもよい。一実施形態では、プロセス温度は約180℃である。他の実施形態では、熱プロセスは、例えばオーブン、炉、高速熱アニーリング(RTA)装置、あるいは他の熱装置によって実施されてもよい。固体生成物(NF4)2SiF6の分解および/または昇華は以下の式として記述されてもよい:
(NF4)2SiF6(s)→SiF4(g)+NH3(g)+HF(g)
[0054]上記のように、固体生成物を除去するための方法のさらなる実施形態は、熱処置によって生成物を昇華させるのではなく(またはこれに加えて)、水溶液(例えば純水)で生成物含有基板をリンスするステップを含んでもよい。基板はまた、水溶液リンスではなく(またはこれに加えて)エタノールやグリコールなどの極性溶媒でリンスされてもよい。
[0055]一部の実施形態では、誘電層120は窒化シリコン層であってもよい。第1の前駆体は、例えば水素(H2)、アンモニア(NH3)、ヒドラジン(N2H4)、アジ化水素酸(HN3)、他の水素含有前駆体およびこれらの種々の組み合わせであってもよい。第2の前駆体は、例えばフッ化水素(HF)、三フッ化窒素(NF3)、四フッ化ケイ素(SiF4)、テトラフルオロメタン(CF4)、フルオロメタン(CH3F)、ジフルオロメタン(CH2F2)、トリフルオロメタン(CHF3)、オクタフルオロプロパン(C3F8)、ヘキサフルオロエタン(C2F6)、他のフッ素含有前駆体またはこれらの種々の組み合わせであってもよい。水素(H2)などの第1の前駆体および三フッ化窒素(NF3)などの第2の前駆体はプラズマとしてイオン化可能である。一部の実施形態では、イオン化プロセスは、誘電層120を堆積するチャンバ内で生じる可能性がある。一部の実施形態では、イオン化プロセスは熱的に生じて、誘電層120を堆積するチャンバに導入されることが可能である。一部の実施形態では、エッチングプロセス130は、堆積チャンバと異なるエッチングチャンバ内で実行可能である。
NF3(g)+H2(g)+Si3N4→(NF4)2SiF6(s)
[0058]再度図2を参照すると、ステップ240は固体生成物(NF4)2SiF6を分解することができる。一部の実施形態では、ステップ240は、固体生成物を熱処置して、固体生成物(NF4)2SiF6を実質的に昇華させるステップを含むことができる。一部の実施形態では、熱プロセスは、固体生成物(NF4)2SiF6をシャワーヘッドに近づけることによって実施されてもよく、これは約−50℃〜約1,000℃のプロセス温度を提供するように動作可能であってもよい。一実施形態では、プロセス温度は約180℃である。他の実施形態では、熱プロセスは、例えばオーブン、炉、高速熱アニーリング(RTA)装置あるいは他の熱装置によって実施されてもよい。固体生成物(NF4)2SiF6の分解および/または昇華は以下の式として記述されてもよい:
(NF4)2SiF6(s)→SiF4(g)+NH3(g)+HF(g)
[0059]上記のように、固体生成物を除去するための方法のさらなる実施形態は、熱処置によって生成物を昇華させるのではなく(またはこれに加えて)水溶液(例えば純水)で生成物含有基板をリンスするステップを含むこともある。基板はまた、水溶液リンスではなく(またはこれに加えて)エタノールやグリコールなどの極性溶媒でリンスされてもよい。
[0073]誘電層を堆積可能な堆積システムは、他のタイプのシステムのうち、高密度プラズマ化学気相堆積(HDP−CVD)システム、プラズマ化学気相堆積(PECVD)システム、減圧化学気相堆積(SACVD)システムおよび熱化学気相堆積システムを含むことがある。本発明の実施形態を具現化可能なCVDシステムの具体例は、Applied Materials,Inc.of Santa Clara,Californiaから入手可能なCENTURA ULTIMATMHDP−CVDチャンバ/システム、およびPRODUCERTMCeleraTMPECVDなどのPRODUCERTMPECVDチャンバ/システムを含んでいる。
[0091]エッチングプロセスを具現化可能なエッチングシステムは、例えば、Applied Materials,Inc.of Santa Clara,Californiaから入手可能なSiConiTM Precleanチャンバ/システムを含んでもよい。
Claims (25)
- 半導体構造を形成するための方法であって、
基板の表面にわたって複数の特徴部を形成するステップであって、少なくとも1つの空間が2つの隣接する特徴部間にあるステップと、
前記特徴部上かつ前記少なくとも1つの空間内に第1の誘電層を形成するステップと、
前記第1の誘電層の一部を、第1の前駆体および第2の前駆体から導出された反応剤と相互作用させて第1の固体生成物を形成するステップと、
前記第1の固体生成物を分解して、前記第1の誘電層の前記一部を実質的に除去するステップと、
第2の誘電層を形成して、前記少なくとも1つの空間を実質的に充填するステップと、
を備える方法。 - 複数の特徴部を形成するステップが、少なくとも複数のトレンチ、導電性ライン、開口およびトランジスタゲートを形成する工程を備える、請求項1に記載の方法。
- 前記第1の誘電層を形成するステップが酸化シリコン層を形成する工程を備える、請求項1に記載の方法。
- 前記第1の誘電層の前記一部を反応剤と相互作用させるステップが、
前記第1の前駆体および前記第2の前駆体をイオン化する工程と、
前記イオン化された第1の前駆体および前記イオン化された第2の前駆体を、前記第1の誘電層の前記一部と相互作用させる工程と、
を備える、請求項1に記載の方法。 - 前記第1の前駆体がアンモニア(NH3)であり、前記第2の前駆体が三フッ化窒素(NF3)である、請求項1に記載の方法。
- 前記第1の誘電層の前記一部を前記反応剤と相互作用させるステップが、
前記第1の誘電層の前記一部を前記第1の前駆体および前記第2の前駆体と相互作用させる工程を備える、請求項1に記載の方法。 - 前記第1の前駆体がアンモニア(NH3)であり、前記第2の前駆体がフッ化水素(HF)である、請求項1に記載の方法。
- 前記第1の誘電層を形成するステップが窒化シリコン層を形成する工程を備える、請求項1に記載の方法。
- 前記第1の誘電層の前記一部を反応剤と相互作用させるステップが、
前記第1の前駆体および前記第2の前駆体をイオン化する工程と、
前記窒化シリコン層の前記一部を、前記イオン化された第1の前駆体および前記イオン化された第2の前駆体と相互作用させる工程と、
を備える、請求項8に記載の方法。 - 前記第1の前駆体が水素(H2)であり、前記第2の前駆体が三フッ化窒素(NF3)である、請求項9に記載の方法。
- 前記第1の固体生成物を分解するステップが、前記第1の固体生成物を熱処置して、前記第1の固体生成物を実質的に昇華させる工程を備える、請求項1に記載の方法。
- 前記第1の固体生成物を分解するステップが、前記生成物を液体溶液に溶解させる工程を備える、請求項1に記載の方法。
- 前記液体溶液が水または極性溶媒を備える、請求項12に記載の方法。
- 前記第1の誘電層の下にライナーを形成するステップをさらに備えており、前記第1の誘電層対前記ライナーのエッチング選択率が約5:1以上である、請求項1に記載の方法。
- 前記ライナーの一部を、第3の前駆体および第4の前駆体から導出された反応剤と相互作用させて第2の固体生成物を発生させるステップと、
前記第2の固体生成物を分解して、前記ライナーの前記一部を除去するステップと、
をさらに備える、請求項14に記載の方法。 - 前記第1の誘電層の別の部分を、第3の前駆体および第4の前駆体から導出された反応剤と相互作用させて、第2の固体生成物を発生させるステップと、
前記第2の固体生成物を分解して、前記第1の誘電層の前記別の部分を除去するステップと、
をさらに備える、請求項1に記載の方法。 - 前記第1の誘電層を前記特徴部上かつ前記少なくとも1つの空間内に形成するステップが約600Torr以上のプロセス圧力を有する、請求項1に記載の方法。
- 前記第1の固体生成物を分解するステップが、前記除去された第1の誘電層の傾斜側壁と、前記除去された第1の誘電層の底部との間の角度を約87°以下に形成する、請求項1に記載の方法。
- 底部および側壁を有する半導体構造に誘電材料を堆積するための方法であって、
前記構造の前記底部および側壁上に第1の誘電層を形成するステップであって、前記層が前記構造を部分的に充填するステップと、
前記第1の誘電層の一部を、第1の前駆体および第2の前駆体から導出された反応剤と相互作用させて第1の固体生成物を形成するステップと、
前記第1の固体生成物を熱処置して、前記第1の固体生成物を実質的に昇華させて、前記構造に傾斜開口を形成するステップと、
第2の誘電層を形成して、前記空間を実質的に充填するステップと、
を備える方法。 - 前記構造がギャップであり、前記ギャップの前記底部と前記側壁のうちの1つとの間に形成された第1の角度が約89°〜約91°に及び、前記傾斜開口の側壁と底部との間の第2の角度が87°未満である、請求項19に記載の方法。
- 前記第1の誘電層の前記一部を反応剤と相互作用させるステップが、
前記第1の前駆体および前記第2の前駆体からプラズマを形成する工程と、
前記プラズマを前記第1の誘電層の前記一部と相互作用させる工程と、
を備える、請求項20に記載の方法。 - 前記第1の前駆体がアンモニア(NH3)であり、前記第2の前駆体が三フッ化窒素(NF3)またはフッ化水素(HF)である、請求項21に記載の方法。
- 前記第1の誘電層の前記一部を反応剤と相互作用させるステップが、
前記第1の前駆体および前記第2の前駆体をエッチングチャンバに導入する工程と、
前記第1の誘電層の前記一部を前記第1の前駆体および前記第2の前駆体と相互作用させる工程と、
を備える、請求項21に記載の方法。 - 前記第1の誘電層を形成するステップが窒化シリコン層を形成するステップを備える、請求項19に記載の方法。
- 前記第1の誘電層の前記一部を反応剤と相互作用させるステップが、
前記第2の前駆体をイオン化する工程と、
前記第1の前駆体および前記イオン化された第2の前駆体をエッチングチャンバに導入する工程と、
前記窒化シリコンの前記一部を前記第1の前駆体および前記イオン化された第2の前駆体と相互作用させる工程と、
を備える、請求項24に記載の方法。
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Also Published As
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CN101299417B (zh) | 2011-04-27 |
KR101289021B1 (ko) | 2013-07-23 |
JP5530062B2 (ja) | 2014-06-25 |
US20080182382A1 (en) | 2008-07-31 |
CN101299417A (zh) | 2008-11-05 |
TW200843025A (en) | 2008-11-01 |
CN101358336A (zh) | 2009-02-04 |
TWI389251B (zh) | 2013-03-11 |
KR20080052500A (ko) | 2008-06-11 |
US7939422B2 (en) | 2011-05-10 |
US20110151676A1 (en) | 2011-06-23 |
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