JP2007074004A - 層間絶縁構造およびその形成方法 - Google Patents
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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
- H01L21/7682—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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Abstract
【解決手段】層間絶縁構造の形成方法であって、第1の金属層を提供する工程と、第1の犠牲層を堆積する工程と、エッチング停止層を堆積する工程と、第2の犠牲層を堆積する工程と、2層のハードマスクを形成する工程と、2層のハードマスクをパターニングしてビアマスクおよびトレンチマスクを生成する工程と、第2の犠牲層をエッチングしてビアを形成する工程と、エッチング停止層の剥き出し部分と第1の犠牲層とをエッチングして第1の金属層を剥き出しにする工程と、第2の犠牲層をエッチングしてトレンチを形成する工程と、バリア金属および銅を堆積し、平坦化して第2の金属層を形成する工程と、第1および第2の犠牲層を分解して上記犠牲層をエアギャップと交換する工程とを包含する。
【選択図】図12
Description
Claims (45)
- 第1の金属層と、第2の金属層と、該第1の金属層と該第2の金属層との間に形成されたエアギャップとを備える、層間絶縁構造。
- 前記第1の金属層と前記第2の金属層との間に第3の金属層が設けられている、請求項1に記載の層間絶縁構造。
- 前記第1の金属層は、少なくとも1つの第1金属線を備え、該第1金属線に隣接してエアーギャップが設けられている、請求項1に記載の層間絶縁構造。
- 前記第2の金属層は、少なくとも1つの第2金属線を備え、該第2金属線に隣接してエアーギャップが設けられている、請求項3に記載の層間絶縁構造。
- 前記第1の金属線および前記第2の金属線の表面が、それぞれ平坦化されている、請求項4に記載の層間絶縁構造。
- 前記第1金属線および前記第2金属線は、それぞれ、バリア金属および銅を有する、請求項4に記載の層間絶縁構造。
- 前記バリア金属は、前記第1金属線および前記第2金属線の底面および側面にそれぞれ設けられている、請求項6に記載の層間絶縁構造。
- 前記第1の金属層は、第1の酸化膜層上に設けられている、請求項1に記載の層間絶縁構造。
- 前記第2の金属層は、第2の酸化膜層上に設けられている、請求項1に記載の層間絶縁構造。
- 前記第1の金属線のいずれかと、前記第2の金属線のいずれかとが、ビアによって接続されている、請求項4に記載の層間絶縁構造。
- 前記ビアは、バリア金属および銅を有する、請求項10に記載の層間絶縁構造。
- 前記バリア金属は、前記ビアの底面および側面に設けられている、請求項11に記載の層間絶縁構造。
- 前記バリア金属は、TiまたはTiNである、請求項7または11に記載の層間絶縁構造。
- 前記第1の金属層は基板上に設けられており、該基板がデバイス領域を有し、前記第1の金属層におけるいずれかの前記第1の金属線は、該デバイス領域に接続されている、請求項3に記載の層間絶縁構造。
- 前記第2の金属層のための機械的な支持台をさらに有する、請求項4に記載の層間絶縁構造。
- 前記支持台は、ビアを含んでいる、請求項15に記載の層間絶縁構造。
- 前記第1の金属層は基板上に設けられており、該基板がデバイス領域を有し、前記第1の金属層における前記第1の金属線は、該デバイス領域および前記ビアに接続された第1部分を含んでおり、
前記支持台は、該第1部分をさらに含んでいる、請求項16に記載の層間絶縁構造。 - 前記支持台に含まれる前記ビアと前記第1金属線の第1部分とが、上下方向に重なっている、請求項17に記載の層間絶縁構造。
- 前記支持台は、前記デバイス領域の周囲に分散している、請求項18に記載の層間絶縁構造。
- 前記支持台は、チップ領域の全体にわたる要点に設けられている、請求項18に記載の層間絶縁構造。
- 前記ビアを含む前記支持台は、電源供給のバスラインとして用いられる、請求項18に記載の層間絶縁構造。
- 前記ビアを含む前記支持台は、アースラインとして用いられる、請求項18に記載の層間絶縁構造。
- 前記第2の金属層上に、エアーギャップと、該エアーギャップを介して積層された金属層とを有する1または複数の積層構造が積層されている、請求項1に記載の層間絶縁構造。
- 前記金属層における最上層に位置する金属層が窒化物でキャップされている、請求項23に記載の層間絶縁構造。
- 前記窒化物がパシベーション層で覆われている、請求項24に記載の層間絶縁構造。
- 前記パシベーション層が酸化物である、請求項25に記載の層間絶縁構造。
- 層間絶縁構造を形成する方法であって、
基板上に第1の金属層を形成する工程と、
該第1の金属層を覆う第1の犠牲層を堆積する工程と、
該第1の犠牲層上に酸化膜層を堆積する工程と、
該酸化膜層上に第2の犠牲層を堆積する工程と、
該第2の犠牲層上に金属を堆積して第2金属層を形成する工程と、
次いで、前記第1の犠牲層および前記第2の犠牲層を分解して、該第1の犠牲層および第2の犠牲層をエアギャップとする工程と
を包含する、層間絶縁構造の形成方法。 - 前記第2の犠牲層を堆積する工程に次いで、該第2の犠牲層を覆うハードマスクを形成して、該ハードマスクをパターニングする工程をさらに包含する、請求項27に記載の層間絶縁構造の形成方法。
- 前記ハードマスクが、前記第1の犠牲層にビアを形成するためのビアマスクと、前記第2の犠牲層にトレンチを形成するためのトレンチマスクとを有する、請求項28に記載の層間絶縁構造の形成方法。
- 前記ハードマスクをパターニングする工程に次いで、前記第1の犠牲層にビアを形成する工程をさらに包含する、請求項28に記載の層間絶縁構造の形成方法。
- 前記第1の犠牲層に前記ビアが形成された後に、前記トレンチマスクにて露出された前記第2の犠牲層を前記酸化膜層までエッチングすることによってトレンチを形成する工程をさらに包含する、請求項30に記載の層間絶縁構造の形成方法。
- 前記第2金属層を形成する工程において、前記ビア内および前記トレンチ内に金属がそれぞれ堆積される、請求項31に記載の層間絶縁構造の形成方法。
- 前記第2金属層を形成する工程において、前記ビア内および前記トレンチ内にバリア金属および銅が順番に堆積される、請求項32に記載の層間絶縁構造の形成方法。
- 前記バリア金属および前記銅を堆積した後に、該バリア金属および該銅を平坦化する工程をさらに包含する、請求項33に記載の層間絶縁構造の形成方法。
- 前記第1の金属層が銅である、請求項27に記載の層間絶縁構造の形成方法。
- 前記ビアマスクは二酸化シリコン層であり、前記トレンチマスクは窒化シリコン層である、請求項29に記載の層間絶縁構造の形成方法。
- 前記ビアマスクは、窒化シリコン層であり、前記トレンチマスクは二酸化シリコンである、請求項29に記載の層間絶縁構造の形成方法。
- 前記第1の犠牲層を堆積する工程において、該第1の犠牲層がスピンコートされる、請求項27に記載の層間絶縁構造の形成方法。
- 前記第1の犠牲層は犠牲ポリマーを含む、請求項27に記載の層間絶縁構造の形成方法。
- 前記犠牲ポリマーは、ブチルノルボルネンおよびトリエトキシシリルノルボルネンのコポリマーを含む、請求項39に記載の層間絶縁構造の形成方法。
- 前記犠牲ポリマーは、6〜12wt%のメシチレン溶液として溶解されたブチルノルボルネンおよびトリエトキシシリルノルボルネンのコポリマーを含む、請求項39に記載の層間絶縁構造の形成方法。
- 前記犠牲ポリマーは、Unity(商品名)犠牲ポリマーを含む、請求項39に記載の層間絶縁構造の形成方法。
- 前記犠牲ポリマーは、6〜12wt%のメシチレン溶液として溶解されたUnity(商品名)犠牲ポリマーを含む、請求項39に記載の層間絶縁構造の形成方法。
- 前記酸化膜層が二酸化シリコンである、請求項27に記載の層間絶縁構造の形成方法。
- 前記第2の犠牲層は犠牲ポリマーである、請求項27に記載の層間絶縁構造の形成方法。
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US09/967,594 US6555467B2 (en) | 2001-09-28 | 2001-09-28 | Method of making air gaps copper interconnect |
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Also Published As
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US6841844B2 (en) | 2005-01-11 |
US20030064581A1 (en) | 2003-04-03 |
US20030064577A1 (en) | 2003-04-03 |
JP4656803B2 (ja) | 2011-03-23 |
US6642138B2 (en) | 2003-11-04 |
US6555467B2 (en) | 2003-04-29 |
JP2003163264A (ja) | 2003-06-06 |
US20030127740A1 (en) | 2003-07-10 |
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