JP7348441B2 - 完全自己整合方式を使用するサブトラクティブ相互接続形成 - Google Patents
完全自己整合方式を使用するサブトラクティブ相互接続形成 Download PDFInfo
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- JP7348441B2 JP7348441B2 JP2020554243A JP2020554243A JP7348441B2 JP 7348441 B2 JP7348441 B2 JP 7348441B2 JP 2020554243 A JP2020554243 A JP 2020554243A JP 2020554243 A JP2020554243 A JP 2020554243A JP 7348441 B2 JP7348441 B2 JP 7348441B2
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- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/768—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
- H01L21/76838—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the conductors
- H01L21/76877—Filling of holes, grooves or trenches, e.g. vias, with conductive material
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- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/768—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
- H01L21/76897—Formation of self-aligned vias or contact plugs, i.e. involving a lithographically uncritical step
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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
- H01L21/28—Manufacture of electrodes on semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/268
- H01L21/28008—Making conductor-insulator-semiconductor electrodes
- H01L21/28017—Making conductor-insulator-semiconductor electrodes the insulator being formed after the semiconductor body, the semiconductor being silicon
- H01L21/28158—Making the insulator
- H01L21/28167—Making the insulator on single crystalline silicon, e.g. using a liquid, i.e. chemical oxidation
- H01L21/28194—Making the insulator on single crystalline silicon, e.g. using a liquid, i.e. chemical oxidation by deposition, e.g. evaporation, ALD, CVD, sputtering, laser deposition
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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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- H01L21/31—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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- 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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- H01L21/31—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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- H01L21/76805—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the dielectrics, e.g. smoothing by forming openings in dielectrics the opening being a via or contact hole penetrating the underlying conductor
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- H01L21/76816—Aspects relating to the layout of the pattern or to the size of vias or trenches
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- H01L21/76801—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the dielectrics, e.g. smoothing
- H01L21/76819—Smoothing of the dielectric
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- H01L21/7682—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the dielectrics, e.g. smoothing the dielectric comprising air gaps
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- H01L21/76829—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the dielectrics, e.g. smoothing characterised by the formation of thin functional dielectric layers, e.g. dielectric etch-stop, barrier, capping or liner layers
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- H01L21/76841—Barrier, adhesion or liner layers
- H01L21/7685—Barrier, adhesion or liner layers the layer covering a conductive structure
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- H01L21/768—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
- H01L21/76838—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the conductors
- H01L21/76885—By forming conductive members before deposition of protective insulating material, e.g. pillars, studs
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- H01L21/76895—Local interconnects; Local pads, as exemplified by patent document EP0896365
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- H01L21/76829—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the dielectrics, e.g. smoothing characterised by the formation of thin functional dielectric layers, e.g. dielectric etch-stop, barrier, capping or liner layers
- H01L21/76831—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the dielectrics, e.g. smoothing characterised by the formation of thin functional dielectric layers, e.g. dielectric etch-stop, barrier, capping or liner layers in via holes or trenches, e.g. non-conductive sidewall liners
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- H01L21/76829—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the dielectrics, e.g. smoothing characterised by the formation of thin functional dielectric layers, e.g. dielectric etch-stop, barrier, capping or liner layers
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- H01L21/76871—Layers specifically deposited to enhance or enable the nucleation of further layers, i.e. seed layers
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- H01L21/76877—Filling of holes, grooves or trenches, e.g. vias, with conductive material
- H01L21/76883—Post-treatment or after-treatment of the conductive material
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Description
本出願は、その内容全体が参照により本明細書に援用される、2018年4月3日に申請された米国仮特許出願第62/651,938号明細書に関連し、その優先権を主張するものである。
Claims (20)
- 集積回路用の相互接続構造を製造する方法であって、前記方法は、
初期相互接続構造上に第1の金属層を堆積させるステップと、
前記第1の金属層上に、凹状フィーチャが含まれているパターン化スペーサ層を形成するステップと、
前記パターン化スペーサ層の凹状フィーチャをマスクとして使用して、前記第1の金属層に、及び前記初期相互接続構造に自己整合ビアをエッチングするステップと、
前記第1の金属層の前記ビア及び前記パターン化スペーサ層の前記凹状フィーチャを第2の金属層で充填するステップと、
前記パターン化スペーサ層を除去するステップと、
前記第2の金属層をマスクとして使用して、前記第1の金属層に凹状フィーチャをエッチングするステップと、
を含む、方法。 - 前記第1の金属層を堆積させるステップは、
前記初期相互接続構造上にエッチング停止層(ESL)を堆積させるステップと、前記エッチング停止層上に前記第1の金属層を堆積させるステップと、前記第1の金属層上に誘電体ハードマスクを堆積させるステップと
を含む、請求項1に記載の方法。 - 前記パターン化スペーサ層は、前記誘電体ハードマスク上に形成される、請求項2に記載の方法。
- 前記初期相互接続構造は、層間絶縁フィーチャ、並びに前記層間絶縁フィーチャ間の金属線及び誘電体ハードマスク線を含み、前記誘電体ハードマスク線は、前記金属線の上に配置される、請求項1に記載の方法。
- 前記パターン化スペーサ層の前記凹状フィーチャを充填する有機平坦化層(OPL)を堆積させるステップと、
前記OPL上に反射防止コーティング(ARC)を堆積させるステップと、
前記ARC上にパターン化フォトレジスト層を形成するステップと、
をさらに含む、請求項1に記載の方法。 - 前記第1の金属層における前記自己整合ビアの前記エッチングの後に、前記パターン化スペーサ層の前記凹状フィーチャから前記OPLを除去するステップ
をさらに含む、請求項5に記載の方法。 - 前記パターン化スペーサ層より上にある前記第2の金属層の部分を除去するステップ
をさらに含む、請求項1に記載の方法。 - 前記第1の金属層の前記凹状フィーチャを充填する層間絶縁層を堆積させるステップ
をさらに含む、請求項1に記載の方法。 - 前記パターン化スペーサ層は、誘電体ハードマスク上に形成され、
前記誘電体ハードマスクより上の前記層間絶縁層及び前記第2の金属層を除去するステップ
をさらに含む、請求項8に記載の方法。 - 前記第2の金属層を前記層間絶縁層の最上部より下に凹ませるステップ
をさらに含む、請求項9に記載の方法。 - 前記第2の金属層の上に前記凹状フィーチャを充填する追加の誘電体ハードマスク層を堆積させるステップ
をさらに含む、請求項10に記載の方法。 - 前記層間絶縁層の最上部より上の前記追加の誘電体ハードマスク層を除去するステップ
をさらに含む、請求項11に記載の方法。 - 前記パターン化スペーサ層は、誘電体ハードマスク上に形成され、
前記誘電体ハードマスクより上の前記第2の金属層を除去するステップ
をさらに含む、請求項1に記載の方法。 - キャップ材料の下の前記第1及び第2の金属層間に空隙を形成する前記キャップ材料を堆積させるステップ
をさらに含む、請求項13に記載の方法。 - 集積回路用の相互接続構造を製造する方法であって、前記方法は、
初期相互接続構造上にエッチング停止層(ESL)を堆積させるステップと、前記エッチング停止層上に第1の金属層を堆積させるステップと、前記第1の金属層上に誘電体ハードマスクを堆積させるステップと、
前記誘電体ハードマスク上に、凹状フィーチャが含まれているパターン化スペーサ層を形成するステップと、
前記パターン化スペーサ層の凹状フィーチャをマスクとして使用して、前記第1の金属層に、及び前記初期相互接続構造に自己整合ビアをエッチングするステップと、
前記第1の金属層の前記ビア及び前記パターン化スペーサ層の前記凹状フィーチャを第2の金属層で充填するステップと、
前記パターン化スペーサ層を除去するステップと、
前記第2の金属層をマスクとして使用して、前記第1の金属層に凹状フィーチャをエッチングするステップと、
前記第1の金属層の前記凹状フィーチャを充填する層間絶縁層を堆積させるステップと、
を含む、方法。 - 前記パターン化スペーサ層の前記凹状フィーチャを充填する有機平坦化層(OPL)を堆積させるステップと、
前記OPL上に反射防止コーティング(ARC)を堆積させるステップと、
前記ARC上にパターン化フォトレジスト層を形成するステップと、
をさらに含む、請求項15に記載の方法。 - 前記第1の金属層に前記自己整合ビアをエッチングした後に、前記パターン化スペーサ層の前記凹状フィーチャからOPLを除去するステップ
をさらに含む、請求項16に記載の方法。 - 前記パターン化スペーサ層より上にある前記第2の金属層の部分を除去するステップ
をさらに含む、請求項15に記載の方法。 - 前記初期相互接続構造は、層間絶縁フィーチャ、並びに前記層間絶縁フィーチャ間の金属線及び誘電体ハードマスク線を含み、前記誘電体ハードマスク線は、前記金属線の上に配置される、請求項15に記載の方法。
- 集積回路用の相互接続構造を製造する方法であって、前記方法は、
初期相互接続構造上にエッチング停止層(ESL)を堆積させるステップと、前記エッチング停止層上に第1の金属層を堆積させるステップと、前記第1の金属層上に誘電体ハードマスクを堆積させるステップと、
前記誘電体ハードマスク上に、凹状フィーチャが含まれているパターン化スペーサ層を形成するステップと、
前記パターン化スペーサ層の前記凹状フィーチャを充填する有機平坦化層(OPL)を堆積させるステップと、
前記OPL上に反射防止コーティング(ARC)を堆積させるステップと、
前記ARC上にパターン化フォトレジスト層を形成するステップと、
前記パターン化スペーサ層の凹状フィーチャをマスクとして使用して、前記第1の金属層に、及び前記初期相互接続構造に自己整合ビアをエッチングするステップと、
前記パターン化スペーサ層の前記凹状フィーチャから前記OPLを除去するステップと、
前記第1の金属層の前記ビア及び前記パターン化スペーサ層の前記凹状フィーチャを第2の金属層で充填するステップと、
前記パターン化スペーサ層より上にある前記第2の金属層の部分を除去するステップと、
前記パターン化スペーサ層を除去するステップと、
前記第2の金属層をマスクとして使用して、前記第1の金属層に凹状フィーチャをエッチングするステップと、
前記第1の金属層の前記凹状フィーチャを充填する層間絶縁層を堆積させるステップと、
を含む、方法。
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