JP5144698B2 - 半導体記憶装置及びその製造方法 - Google Patents
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- G11C16/00—Erasable programmable read-only memories
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- H10B43/00—EEPROM devices comprising charge-trapping gate insulators
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- H10B43/23—EEPROM devices comprising charge-trapping gate insulators characterised by three-dimensional arrangements, e.g. with cells on different height levels with source and drain on different levels, e.g. with sloping channels
- H10B43/27—EEPROM devices comprising charge-trapping gate insulators characterised by three-dimensional arrangements, e.g. with cells on different height levels with source and drain on different levels, e.g. with sloping channels the channels comprising vertical portions, e.g. U-shaped channels
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- H10B43/40—EEPROM devices comprising charge-trapping gate insulators characterised by the peripheral circuit region
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C16/00—Erasable programmable read-only memories
- G11C16/02—Erasable programmable read-only memories electrically programmable
- G11C16/04—Erasable programmable read-only memories electrically programmable using variable threshold transistors, e.g. FAMOS
- G11C16/0483—Erasable programmable read-only memories electrically programmable using variable threshold transistors, e.g. FAMOS comprising cells having several storage transistors connected in series
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Description
これに対し、一括加工型3次元積層メモリが提案されている。この一括加工型3次元積層メモリにおいては、交互に積層された絶縁膜と電極膜とを有する積層体と、積層体を貫通するシリコンピラーと、シリコンピラーと電極膜との間の電荷蓄積層(記憶層)と、が設けられ、これにより、シリコンピラーと各電極膜との交差部にメモリセルが設けられる。
更に、メモリデバイスにおけるコントロールゲートとして機能する導電層と、絶縁層とを交互に複数積層した積層体にメモリホールを形成し、そのメモリホールの内壁に電荷蓄積膜を形成した後、メモリホール内にシリコンを設けることでメモリセルを3次元配列する技術が、例えば特許文献1に提案されている。
また、本発明の他の一態様によれば、基板と、前記基板の表面に形成された周辺回路とを有する基体と、前記基体上にそれぞれ交互に積層された複数の導電層と複数の絶縁層とを有する積層体と、前記積層体の積層方向に形成されたメモリホールの内壁に設けられた電荷蓄積膜を含むメモリ膜と、前記メモリホール内における前記メモリ膜の内側に設けられたチャネルボディと、前記積層体を貫通して設けられたコンタクトプラグと、前記周辺回路と前記積層体との間に設けられ、前記コンタクトプラグの下端部に接続されたグローバルビット線と、前記積層体の上に設けられ、その延在方向に分断された複数のローカルビット線であって、前記チャネルボディに接続されると共に、前記コンタクトプラグを介して前記グローバルビット線に対して共通に接続された複数のローカルビット線と、前記ローカルビット線、前記グローバルビット線及び前記導電層に対して電気的に独立して操作可能なソース線と、を備え、前記チャネルボディは、前記ローカルビット線と前記ソース線との間に接続されたメモリストリングチャネルボディと、前記ローカルビット線と前記コンタクトプラグとの間に接続されたコンタクトチャネルボディと、を有することを特徴とする半導体記憶装置が提供される。
また、本発明のさらに他の一態様によれば、基板の表面に周辺回路を形成する工程と、前記周辺回路の上に、グローバルビット線を形成する工程と、前記グローバルビット線の上に、複数の導電層と複数の絶縁層とをそれぞれ交互に積層して積層体を形成する工程と、前記積層体にメモリホールを形成する工程と、前記メモリホールの内壁に電荷蓄積膜を含むメモリ膜を形成する工程と、前記メモリホール内における前記メモリ膜の内側にチャネルボディを形成する工程と、前記積層体を貫通して前記グローバルビット線と接続されたコンタクトプラグを形成する工程と、前記積層体の上に、前記チャネルボディ及び前記コンタクトプラグに接続され、その延在方向に分断された複数のローカルビット線を形成する工程と、を備えたことを特徴とする半導体記憶装置の製造方法が提供される。
図1は、本発明の第1実施形態に係る半導体記憶装置の模式断面図である。
図2、同半導体記憶装置におけるメモリセルアレイの模式斜視図である。なお、図2においては、図を見易くするために、メモリホールMH内に形成された絶縁膜以外の絶縁部分については図示を省略している。
なお、メモリ膜30の構成は前述した構成に限らない。例えば、第1の絶縁膜31が、一対のシリコン酸化膜でシリコン窒化膜を挟んだ積層膜構造であってもよい。
図5は、本発明の第2実施形態に係る半導体記憶装置の模式断面図である。
図6は、本発明の第3実施形態に係る半導体記憶装置の模式断面図である。
図8は、本発明の第4実施形態に係る半導体記憶装置の模式断面図である。
前述したY方向で隣接するローカルビット線LBL間でコンタクトプラグ54を共有する形態において、コンタクトストリングは、図9に示すように、上記第3実施形態のコンタクトストリング71を用いてもよい。
Claims (5)
- 基板と、前記基板の表面に形成された周辺回路とを有する基体と、
前記基体上にそれぞれ交互に積層された複数の導電層と複数の絶縁層とを有する積層体と、
前記積層体の積層方向に形成されたメモリホールの内壁に設けられた電荷蓄積膜を含むメモリ膜と、
前記メモリホール内における前記メモリ膜の内側に設けられたチャネルボディと、
前記積層体を貫通して設けられたコンタクトプラグと、
前記周辺回路と前記積層体との間に設けられ、前記コンタクトプラグの下端部に接続されたグローバルビット線と、
前記積層体の上に設けられ、その延在方向に分断された複数のローカルビット線であって、前記チャネルボディに接続されると共に、前記コンタクトプラグを介して前記グローバルビット線に対して共通に接続された複数のローカルビット線と、
を備え、
前記コンタクトプラグを前記延在方向に挟んで隣接する2つの前記ローカルビット線が、前記コンタクトプラグに対して共通に接続されていることを特徴とする半導体記憶装置。 - 基板と、前記基板の表面に形成された周辺回路とを有する基体と、
前記基体上にそれぞれ交互に積層された複数の導電層と複数の絶縁層とを有する積層体と、
前記積層体の積層方向に形成されたメモリホールの内壁に設けられた電荷蓄積膜を含むメモリ膜と、
前記メモリホール内における前記メモリ膜の内側に設けられたチャネルボディと、
前記積層体を貫通して設けられたコンタクトプラグと、
前記周辺回路と前記積層体との間に設けられ、前記コンタクトプラグの下端部に接続されたグローバルビット線と、
前記積層体の上に設けられ、その延在方向に分断された複数のローカルビット線であって、前記チャネルボディに接続されると共に、前記コンタクトプラグを介して前記グローバルビット線に対して共通に接続された複数のローカルビット線と、
前記ローカルビット線、前記グローバルビット線及び前記導電層に対して電気的に独立して操作可能なソース線と、
を備え、
前記チャネルボディは、
前記ローカルビット線と前記ソース線との間に接続されたメモリストリングチャネルボディと、
前記ローカルビット線と前記コンタクトプラグとの間に接続されたコンタクトチャネルボディと、
を有することを特徴とする半導体記憶装置。 - 前記ローカルビット線、前記グローバルビット線及び前記導電層に対して電気的に独立して操作可能なソース線をさらに備え、
前記チャネルボディは、
前記ローカルビット線と前記ソース線との間に接続されたメモリストリングチャネルボディと、
前記ローカルビット線と前記コンタクトプラグとの間に接続されたコンタクトチャネルボディと、
を有することを特徴とする請求項1記載の半導体記憶装置。 - 複数の前記コンタクトチャネルボディが、前記ローカルビット線と前記コンタクトプラグとの間に並列接続されたことを特徴とする請求項2または3記載の半導体記憶装置。
- 基板の表面に周辺回路を形成する工程と、
前記周辺回路の上に、グローバルビット線を形成する工程と、
前記グローバルビット線の上に、複数の導電層と複数の絶縁層とをそれぞれ交互に積層して積層体を形成する工程と、
前記積層体にメモリホールを形成する工程と、
前記メモリホールの内壁に電荷蓄積膜を含むメモリ膜を形成する工程と、
前記メモリホール内における前記メモリ膜の内側にチャネルボディを形成する工程と、
前記積層体を貫通して前記グローバルビット線と接続されたコンタクトプラグを形成する工程と、
前記積層体の上に、前記チャネルボディ及び前記コンタクトプラグに接続され、その延在方向に分断された複数のローカルビット線を形成する工程と、
を備えたことを特徴とする半導体記憶装置の製造方法。
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| JP2010048839A JP5144698B2 (ja) | 2010-03-05 | 2010-03-05 | 半導体記憶装置及びその製造方法 |
| US12/813,895 US8288816B2 (en) | 2010-03-05 | 2010-06-11 | Semiconductor memory device and method for manufacturing same |
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