JP5111878B2 - 半導体装置の製造方法 - Google Patents
半導体装置の製造方法 Download PDFInfo
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- JP5111878B2 JP5111878B2 JP2007021732A JP2007021732A JP5111878B2 JP 5111878 B2 JP5111878 B2 JP 5111878B2 JP 2007021732 A JP2007021732 A JP 2007021732A JP 2007021732 A JP2007021732 A JP 2007021732A JP 5111878 B2 JP5111878 B2 JP 5111878B2
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- wiring
- semiconductor device
- pad
- manufacturing
- wiring layer
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
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- H01L23/585—Structural electrical arrangements for semiconductor devices not otherwise provided for, e.g. in combination with batteries comprising conductive layers or plates or strips or rods or rings
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Description
以下、図1乃至4を用いて、本発明の実施の形態1にかかる半導体装置の構成を説明する。図1は、実施の形態1の半導体装置の回路を説明するための図である。先ず、図1を用いて内部回路の説明を行ったあと、図2乃至4を用いて具体的な構造について説明する。
以下、図6および7を用いて、本実施形態にかかる半導体装置の製造方法で用いるマスク202の製造方法の一例について説明する。マスク202は、ノーマルフォトマスクとハーフトーンマスクとが一つの透明基板に形成されているマスクである。図6は、マスク202の断面図を、製造方法の進行に応じて、それぞれ簡略化して示した図である。マスク202を作成するに当たり、先ず、ガラス基板(石英)204に位相シフト層206および遮光層208が積層された部材を準備する(図6(a))。位相シフト層206の材料は適宜選択可能であり、種々の公知の材料を用いることができる。
次に、図8乃至24を用いて、本実施形態に係る半導体装置の製造方法について説明する。ここでは、上述した半導体装置40についての製造方法を説明する。上記のマスク202は、この製造方法の工程中で、パッドの下層の配線層(半導体装置40における第6配線層160)を形成する工程で用いられる。
(第1変形例)
実施の形態1では、第6配線層160のパッド下部の配線をノーマルフォトマスクを用いて形成した。そして、他の部位の配線をハーフトーンマスクを用いて形成した。しかしながら、本発明はこれに限られるものではない。パッド下部以外の配線にあっては、ノーマルフォトマスクと位相シフトマスクとを適宜使い分けることができる。例えば、I/Oセル領域44の配線層については全てノーマルマスクを用いて、コア回路領域46の配線層については全て位相シフトマスクを用いて、それぞれフォトリソグラフィを行うこととしてもよい。
実施の形態1では、補強用配線52をスリット状のパターンとした。しかしながら、本発明はこの構造のみに限られるものではない。パッド下層の補強用配線を適宜好適なパターンとして、ノーマルフォトマスクを用いて形成することとすればよい。すなわち、上記列挙した公知文献に記載の思想に開示されている種々の補強用配線を選択することができる。また、補強用配線としては、前述の通り、パターン占有率を高く設定することが好ましい。パターン占有率の高い領域については、ノーマルフォトマスクを使用することにより、サブピークの発生を有効に防ぐことができる。
実施の形態1では、一部の層間絶縁膜に、低誘電率膜(Low−k膜)として、SiOC膜を用いた。しかしながら、本発明はこれに何ら限定されるものではない。低誘電率膜としては、SiOC膜のほか、SiOF膜、SiLK膜、SiCN膜、メチル基を含有するSiO2膜、MSQ(Methyl Silses Quioxane)等が含まれる。これらの低誘電率膜は、いずれもSiO2膜(比誘電率3.9〜4程度)よりも比誘電率の低い膜である。これらの低誘電率膜を層間絶縁膜として用いて、下層配線層を形成してもよい。また、必ずしも、これらのような低誘電率膜を使用しなくとも良い。
実施の形態1では、下層配線層のプラグ配線の径、およびパッド下層の配線を形成するための光透過パターンの幅が、それぞれのフォトリソグラフィ工程における光源の波長以下とされている。しかしながら、本発明はこれに限られるものではなく、必ずしもそれらの寸法が光源の波長以下でなくともよい。必要に応じ、適宜好適な径および幅とすることができる。
実施の形態1では、補強用配線として、環状の配線(補強用環状配線54)を設けている。また、第5配線層には、ベタパターンとして、Cuからなる配線156を設けている。しかしながら、本発明はこれに限られるものではない。補強用環状配線54と配線156とのいずれか一方、或いは双方を省略してもよい。図25は第5変形例に係る半導体装置のパッド近傍の拡大平面図である。実施形態1の半導体装置40における、図3と対応する図である。図25のように、補強用配線52のみで補強を行うこととしてもよい。
以下、図26乃至36を用いて、本発明の実施の形態2について説明する。実施の形態2にかかる半導体装置は、後述するように、実施の形態1と共通の構成を有している。具体的には、実施の形態2にかかる半導体装置は、実施の形態1の回路(図1)と同様の回路をその内部に備えている。また、装置表面の形状も、実施の形態1の装置表面構造(図2)と同様である。したがって、回路構成、表面構造に関しては図示および説明を省略し、実施の形態2において、実施の形態1と特に相違する部位に関して、以下詳細に説明する。
(第1変形例)
実施の形態2では、プロービング領域372下層には補強用配線を設け、外部接続領域370下層には補強用配線を設けない構成とした。しかしながら、本発明はこれに限られるものではない。外部接続用領域370下層のスペースのうち、一部に補強用配線を設け、残部に下層配線と接続する配線を設けることとしてもよい。すなわち、外部接続領域370下層のスペースの一部に補強用配線を設けてもよい。
外部接続領域のV1/V2 < プロービング領域のV1/V2
実施の形態2では、外部接続領域370にレベルシフト回路配線332を配置した。しかしながら、本発明はこれに限られるものではない。外部接続領域370を、種々の回路配線の引き回しのために、適宜利用することができる。例えば、当該領域を、電源用もしくはグランド用の配線であって抵抗低減のための配線を形成するために用いることができる。
実施の形態2の製造方法では、検査用プローブに、タングステン製のカンチレバー型プローブを用いた。しかしながら、本発明は、これに限られるものではない。すなわち、実施の形態2の製造工程に、他の種々のプローブ、例えば、コブラ型プローブ、薄膜プローブに代表される垂直型プローブなどの種々の公知のプローブを使用することができる。
配線 50、350
補強用配線 52、352
補強用環状配線 54、354
半導体基板 100、400
層間絶縁膜 112、122、132、142、152、162
412、422、432、442、452、462
配線 114、124、134、144、154、156、164
414、424、434、444、454、456、464
Claims (11)
- 所定の光透過パターンを備える位相シフトマスクと、所定の光透過パターンを備えるノーマルフォトマスクとを準備する工程と、
半導体基板に第1配線層を積層し、該第1配線層に、該第1配線層の配線に接続する第2配線および該第1配線層の配線に接続しない第3配線を含んでなる第2配線層をさらに積層する工程と、
前記第2配線層に層間絶縁膜を積層する工程と、
前記層間絶縁膜に、前記ノーマルフォトマスクを用いたフォトリソグラフィにより、前記第2配線が露出する第1開口と、前記第3配線が露出する第2開口とを形成する工程と、
前記第1開口と前記第2開口とに金属を埋め込む工程と、
前記金属が埋め込まれた前記第1、2開口に重ねてパッドを設ける工程とを含み、
前記第1、2配線層を積層する工程は、該第1、2配線層の少なくとも一部の配線を前記位相シフトマスクを用いたフォトリソグラフィにより形成し、
前記ノーマルフォトマスクの前記光透過パターンは複数の線状の光透過パターンを含み、該線状の光透過パターンにより前記第1、2開口を形成し、
前記線状のパターンの幅が、前記ノーマルフォトマスクを用いたフォトリソグラフィにおける照射光の波長以下であることを特徴とする半導体装置の製造方法。 - 前記第1、2配線層の層間絶縁膜および前記第2配線層に積層される層間絶縁膜のうちの少なくとも一部が、シリコン酸化膜よりも比誘電率の低い低誘電率膜であることを特徴とする請求項1に記載の半導体装置の製造方法。
- 前記位相シフトマスクを用いるフォトリソグラフィにより形成される前記配線は、該フォトリソグラフィの照射光の波長以下の幅の配線を含むことを特徴とする請求項1または2に記載の半導体装置の製造方法。
- 前記ノーマルフォトマスクの前記光透過パターンは環状の光透過パターンを含み、
前記第1、2開口を形成する工程は、該第1、2開口とともに該第2開口を囲うように形成される環状開口を形成する工程であることを特徴とする請求項1乃至3のいずれか1項に記載の半導体装置の製造方法。 - 所定の光透過パターンを備える位相シフトマスクと、所定の光透過パターンを備えるノーマルフォトマスクとを準備する工程と、
半導体基板に第1配線層を積層し、該第1配線層に、該第1配線層の配線に接続する第2配線および該第1配線層の配線に接続しない第3配線を含んでなる第2配線層をさらに積層する工程と、
前記第2配線層に層間絶縁膜を積層する工程と、
前記層間絶縁膜の一部の領域に、前記ノーマルフォトマスクを用いたフォトリソグラフィにより、前記第2配線が露出する第1開口と、前記第3配線が露出する第2開口とを形成し、該層間絶縁膜の他の領域に、前記位相シフトマスクを用いたフォトリソグラフィにより、前記第2配線が露出する第3開口を形成する工程と、
前記第1、2、3開口に金属を埋め込む工程と、
前記金属が埋め込まれた前記第1、2、3開口のうち、前記第1、2開口と重なり、かつ前記第3開口と重ならないようにパッドを設ける工程と、
を含むことを特徴とする半導体装置の製造方法。 - 前記ノーマルフォトマスクの前記光透過パターンは複数の線状の光透過パターンを含み、該線状の光透過パターンを用いて前記第1、2開口を形成することを特徴とする請求項5に記載の半導体装置の製造方法。
- 前記第1、2配線層の層間絶縁膜および前記第2配線層に積層される層間絶縁膜のうちの少なくとも一部が、シリコン酸化膜よりも比誘電率の低い低誘電率膜であることを特徴とする請求項5または6に記載の半導体装置の製造方法。
- 前記位相シフトマスクを用いるフォトリソグラフィにより形成される前記配線は、該フォトリソグラフィの照射光の波長以下の幅の配線を含むことを特徴とする請求項5乃至7のいずれか1項記載の半導体装置の製造方法。
- 前記線状のパターンの幅が、前記ノーマルフォトマスクを用いたフォトリソグラフィにおける照射光の波長以下であることを特徴とする請求項6に記載の半導体装置の製造方法。
- 前記ノーマルフォトマスクの前記光透過パターンは環状の光透過パターンを含み、
前記第1、2開口を形成する工程は、該第1、2開口とともに該第2開口を囲うように形成される環状開口を形成する工程であることを特徴とする請求項5乃至9のいずれか1項記載の半導体装置の製造方法。 - 所定の回路パターンが設けられた位相シフトマスクと、複数の線状の光透過パターンを備えるノーマルフォトマスクとを準備する工程と、
半導体基板に配線層を積層する工程と、
前記配線層に層間絶縁膜を積層する工程と、
前記層間絶縁膜の一部の領域に、前記ノーマルフォトマスクを用いたフォトリソグラフィにより、前記配線層の配線が露出する第1開口と該配線が露出しない第2開口とを形成し、該層間絶縁膜の他の領域に、前記位相シフトマスクを用いたフォトリソグラフィにより、前記配線層の配線が露出する第3開口を形成する工程と、
前記第1、2、3開口に金属を埋め込む工程と、
前記金属が埋め込まれた前記第1、2開口に重ねてパッドを設ける工程と、
を含むことを特徴とする半導体装置の製造方法。
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2007
- 2007-01-31 JP JP2007021732A patent/JP5111878B2/ja not_active Expired - Fee Related
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2008
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US20100159690A1 (en) | 2010-06-24 |
JP2008187140A (ja) | 2008-08-14 |
US8084279B2 (en) | 2011-12-27 |
US20080217786A1 (en) | 2008-09-11 |
US7696081B2 (en) | 2010-04-13 |
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