JP7142607B2 - Low-k層を保護する方法 - Google Patents
Low-k層を保護する方法 Download PDFInfo
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- JP7142607B2 JP7142607B2 JP2019110294A JP2019110294A JP7142607B2 JP 7142607 B2 JP7142607 B2 JP 7142607B2 JP 2019110294 A JP2019110294 A JP 2019110294A JP 2019110294 A JP2019110294 A JP 2019110294A JP 7142607 B2 JP7142607 B2 JP 7142607B2
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- layer
- low
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- 229910052726 zirconium Inorganic materials 0.000 description 1
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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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- H01L21/76838—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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- H01L21/18—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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- H01L21/302—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
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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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- H01L23/52—Arrangements for conducting electric current within the device in operation from one component to another, i.e. interconnections, e.g. wires, lead frames
- H01L23/522—Arrangements for conducting electric current within the device in operation from one component to another, i.e. interconnections, e.g. wires, lead frames including external interconnections consisting of a multilayer structure of conductive and insulating layers inseparably formed on the semiconductor body
- H01L23/532—Arrangements for conducting electric current within the device in operation from one component to another, i.e. interconnections, e.g. wires, lead frames including external interconnections consisting of a multilayer structure of conductive and insulating layers inseparably formed on the semiconductor body characterised by the materials
- H01L23/53204—Conductive materials
- H01L23/53209—Conductive materials based on metals, e.g. alloys, metal silicides
- H01L23/53242—Conductive materials based on metals, e.g. alloys, metal silicides the principal metal being a noble metal, e.g. gold
- H01L23/53252—Additional layers associated with noble-metal layers, e.g. adhesion, barrier, cladding layers
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Manufacturing & Machinery (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Plasma & Fusion (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Internal Circuitry In Semiconductor Integrated Circuit Devices (AREA)
- Drying Of Semiconductors (AREA)
- Semiconductor Lasers (AREA)
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Description
105 基板
110 下地層
115、135 Low-k層
120 導体層
125 バリアまたはライナ層
130 プラズマ
205 保護層
240 リセス
310 ハードマスク層
320 SAM層
410 エッチング停止層
610 上部Low-k層
620 上部ハードマスク層
630 金属ハードマスク層
640 第1の上部フォトレジスト層
650 第2の上部フォトレジスト層
660 ビア
670 上部トレンチ
680 上部バリアまたはライナ層
690 上部導体層
695 上部リセス
697 上部エッチング停止層
705、710、715、720、805、810、815、905、910、915 ステップ
Claims (20)
- 基板を処理するための方法であって、前記方法は、
導体層およびLow-k層を含むパターン構造を前記基板に設けるステップと、
前記導体層の露出面上に自己整合単分子膜を形成するステップと、
保護層の選択的堆積を行うステップであって、前記選択的堆積は、保護層を前記Low-k層上に選択的に形成する、ステップと、
前記自己整合単分子膜と前記導体層の一部とを選択的に除去するように導体リセス・ドライ・エッチングを行うステップであって、前記保護層は、前記導体リセス・ドライ・エッチング中に前記Low-k層の損傷を抑制する、ステップと、
を含む方法。 - 前記導体層と前記Low-k層との間にバリアまたはライナ層を設けるステップであって、前記導体リセス・ドライ・エッチングは、前記バリアまたはライナ層が前記導体リセス・ドライ・エッチング中に前記Low-k層の側壁の損傷を抑制するように、前記導体層を前記バリアまたはライナ層まで選択的にエッチングする、ステップ
をさらに含む、請求項1に記載の方法。 - 前記導体層と前記Low-k層との間にバリアまたはライナ層を設けるステップと、
前記導体リセス・ドライ・エッチングの後、前記バリアまたはライナ層の露出部分を除去するためにバリアまたはライナ層除去プロセスを行うステップと、
をさらに含む、請求項1に記載の方法。 - 前記導体リセス・ドライ・エッチングを行った後に前記基板上にエッチング停止層を形成するステップであって、前記保護層は、該エッチング停止層の形成中に前記基板上にある、ステップ
をさらに含む、請求項3に記載の方法。 - 前記導体リセス・ドライ・エッチングを行った後に前記基板上にエッチング停止層を形成するステップであって、前記保護層は、該エッチング停止層の形成の前に前記基板から除去される、ステップ
をさらに含む、請求項3に記載の方法。 - 前記導体リセス・ドライ・エッチングを行った後に前記基板上にエッチング停止層を形成するステップであって、前記保護層は、該エッチング停止層の形成中に前記基板上にある、ステップ
をさらに含む、請求項1に記載の方法。 - 前記導体リセス・ドライ・エッチングを行った後に前記基板上にエッチング停止層を形成するステップであって、前記保護層は、該エッチング停止層の形成の前に前記基板から除去される、ステップ
をさらに含む、請求項1に記載の方法。 - 前記Low-k層の損傷の抑制は、前記Low-k層の誘電率の増大を抑制する、請求項1に記載の方法。
- 自己整合ビアを形成するのに利用される方法であって、前記方法は、
導体層およびLow-k誘電体層を含むパターン構造を基板に設けるステップであって、前記導体層は、前記Low-k誘電体層に埋め込まれ、前記導体層は、前記自己整合ビアが上に配置されることになる下部導体層である、ステップと、
保護層の選択的形成を行うステップであって、前記選択的形成は、前記保護層を前記Low-k誘電体層の上に選択的に形成し、前記導体層の上に形成しない、ステップと、
前記導体層の一部を選択的に除去するように導体リセス・ドライ・エッチングを行うステップであって、前記保護層は、前記導体リセス・ドライ・エッチング中に前記Low-k誘電体層の損傷を抑制する、ステップと、
を含む方法。 - 前記保護層の前記選択的形成の前に前記導体層の露出面上に自己整合単分子膜を形成するステップをさらに含む、請求項9に記載の方法。
- 前記導体リセス・ドライ・エッチングを行った後に前記基板上にエッチング停止層を形成するステップであって、前記保護層は、該エッチング停止層の形成中に前記基板上にある、ステップ
をさらに含む、請求項9に記載の方法。 - 前記導体リセス・ドライ・エッチングを行った後に前記基板上にエッチング停止層を形成するステップであって、前記保護層は、該エッチング停止層の形成の前に前記基板から除去される、ステップ
をさらに含む、請求項9に記載の方法。 - 前記導体リセス・ドライ・エッチングの後に、1つまたは複数の追加の自己整合ビア・プロセス・ステップ中に前記基板上に前記保護層を残すステップをさらに含む、請求項9に記載の方法。
- 前記導体リセス・ドライ・エッチングの後に前記保護層を除去するステップをさらに含む、請求項9に記載の方法。
- 前記Low-k誘電体層の損傷の抑制は、前記Low-k誘電体層の誘電率の増大を抑制する、請求項9に記載の方法。
- 金属層にリセスを形成するのに利用される方法であって、前記方法は、
金属層およびLow-k誘電体層を含むパターン構造を基板に設けるステップであって、前記金属層は、前記Low-k誘電体層に埋め込まれ、前記金属層は、複数の露出金属表面を有し、前記Low-k誘電体層は、複数のLow-k誘電体露出面を有する、ステップと、
保護層の選択的形成を行うステップであって、前記選択的形成は、前記保護層を前記複数のLow-k誘電体露出面の上に選択的に形成する、ステップと、
前記金属層の一部を除去するように金属リセス・ドライ・エッチングを行うステップであって、前記ステップによって前記金属層にリセスを形成し、前記保護層は、前記金属リセス・ドライ・エッチング中に前記Low-k誘電体層の損傷を抑制する、ステップと、
を含む方法。 - 前記金属層は、ルテニウムを含み、前記金属リセス・ドライ・エッチングは、酸素含有プラズマを含む、請求項16に記載の方法。
- 前記保護層の前記選択的形成の前に前記複数の露出金属表面上に自己整合単分子膜を形成するステップをさらに含む、請求項16に記載の方法。
- 前記金属リセス・ドライ・エッチングを行った後に前記保護層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。
- 前記リセスが形成された後に行われる1つまたは複数の追加のプロセスステップ中に前記基板上に前記保護層を残すステップをさらに含む、請求項16に記載の方法。
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