JP6226917B2 - 垂直3dメモリデバイス、並びにその製造方法 - Google Patents
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- H10B43/00—EEPROM devices comprising charge-trapping gate insulators
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
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- H01L29/40—Electrodes ; Multistep manufacturing processes therefor
- H01L29/401—Multistep manufacturing processes
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- H01L29/423—Electrodes ; Multistep manufacturing processes therefor characterised by their shape, relative sizes or dispositions not carrying the current to be rectified, amplified or switched
- H01L29/42312—Gate electrodes for field effect devices
- H01L29/42316—Gate electrodes for field effect devices for field-effect transistors
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- H10B—ELECTRONIC MEMORY DEVICES
- H10B41/00—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates
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- H10B41/35—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates characterised by the memory core region with a cell select transistor, e.g. NAND
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- H10B—ELECTRONIC MEMORY DEVICES
- H10B43/00—EEPROM devices comprising charge-trapping gate insulators
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- H10B43/35—EEPROM devices comprising charge-trapping gate insulators characterised by the memory core region with cell select transistors, e.g. NAND
Description
(1)犠牲層とアクティブ層との交互のスタックを形成することであり、アクティブ層はアレイに形成されるメモリセルのチャネル線として用いられる半導体材料とすることができる。
(2)スタックを貫通して延在する第1の穴のアレイを形成することであり、アレイは穴の行及び列に配列されてパターニングされたアクティブ層を形成し、第1の穴のアレイはアレイに形成されるメモリセルのチャネル長の決定要因とすることができる。
(3)穴のアレイのうちの穴において露出する犠牲層の材料を、パターニングされたアクティブ層の間に延在する支柱(post)のアレイを結果として形成することになる量だけ除去することであり、支柱のアレイはパターニングされたアクティブ層と組み合わさってバットレス構造を提供する。
(4)バットレス構造におけるパターニングされたアクティブ層の全て又は少なくとも一部分に、メモリ膜を用いてライニングを施すことであり、メモリ膜はアレイに形成されるメモリセルの多層誘電体電荷蓄積構造とすることができる。
(5)上記ライニングを施すことの後に前記バットレス構造をアクティブ材料(活性材料)で充填することであり、アクティブ材料は、アレイに形成されるメモリセルのためのワード線として用いることが可能な、ドープされた半導体又は他の導電性材料とすることができる。
(6)第1のアレイからずらして第2の穴のアレイを形成し、これにより、ライニングを施されたアクティブ層の第1の穴のアレイのうちの穴の間のワード線方向のエクステンションを分断して、第1の方向に延在するライニングを施された水平アクティブ線を形成し、アクティブ材料を、これらのライニングを施された水平アクティブ線によって貫通される垂直スライスに分離すること。水平アクティブ線はアレイに形成されるメモリセルの水平チャネル(又はNANDストリングビット線)とすることができる。アクティブ材料の垂直スライスは水平アクティブ線を取り囲むGAAワード線とすることができる。水平チャネルGAAフラッシュメモリセルの3Dアレイは本明細書に記載される工程を用いて作製することができる。
Claims (13)
- 複数の階層において材料の層の一部を有する水平アクティブ線の複数のスタックであって、前記材料の層の一部は、行及び列で配置されて該材料の層を貫通する第1の穴のアレイと第2の穴のアレイによって画定される側部を有する水平アクティブ線を形成し、前記第2の穴のアレイは前記第1の穴のアレイから第1方向にずらされることでワード線方向の前記水平アクティブ線を分断し、かつ、前記水平アクティブ線は前記第1方向に延在する、スタックと、
前記複数のスタックにおける前記水平アクティブ線の間に垂直に延在する複数の絶縁支柱を含むバットレス構造であって、前記複数の絶縁支柱中の各絶縁支柱は、前記水平アクティブ線間の支持体として垂直に固定され、前記複数の絶縁支柱中の各絶縁支柱は、前記アレイの2つの列及び2つの行において隣接する穴の周縁の間で、かつ、前記隣接する穴の周縁から間隔をあけて設けられる、バットレス構造と、
前記第1の穴のアレイ中の穴の行の間に設けられる前記水平アクティブ線によって貫通され、前記水平アクティブ線を取り囲む複数の垂直スライスであって、前記第2の穴のアレイ中の穴の行と列によって分断される前記垂直スライスは、垂直方向と前記ワード線方向の両方に延在することでワード線として動作する、複数の垂直スライスと、
前記水平アクティブ線を取り囲み、かつ、前記複数のスタックにおける前記水平アクティブ線と前記複数の垂直スライスのうちの前記垂直スライスとの間に設けられるメモリ膜と、
を含むメモリデバイス。 - 前記水平アクティブ線は半導体チャネル線を含む、請求項1に記載のメモリデバイス。
- 前記メモリ膜は多層誘電体電荷トラッピング構造を含み、前記水平アクティブ線は半導体を含み、前記垂直スライスは導電性材料を含む、
請求項1に記載のメモリデバイス。 - 前記水平アクティブ線のうちの少なくとも1つは、同じスタックにおける前記水平アクティブ線のうちの他の少なくとも1つの垂直方向の厚さと異なる垂直方向の厚さを有する、
請求項1に記載のメモリデバイス。 - 前記水平アクティブ線は、波形形状の対向する側部を有する、
請求項1に記載のメモリデバイス。 - 前記複数の水平アクティブ線は丸められた表面を有し、前記複数の水平アクティブ線は前記丸められた表面で前記複数の垂直スライスを貫通する、
請求項1に記載のメモリデバイス。 - 前記水平アクティブ線は水平NANDビット線ストリップを含み、前記メモリ膜は誘電体電荷トラッピング構造を含む、
請求項1に記載のメモリデバイス。 - 犠牲層とアクティブ層との交互のスタックを形成することと、
前記スタックを貫通して延在する第1の穴のアレイを形成することであって、前記アレイは穴の行及び列に配列されてパターニングされたアクティブ層を形成することと、
前記穴のアレイのうちの前記穴において露出する前記犠牲層の材料を、前記パターニングされたアクティブ層と前記パターニングされたアクティブ層の間に延在する支柱のアレイとを含むバットレス構造を結果として形成することになる量だけ除去することと、
前記バットレス構造の前記パターニングされたアクティブ層の少なくとも一部分に、メモリ膜を用いてライニングを施すことと、
前記ライニングを施すことの後に前記バットレス構造をアクティブ材料で充填することと、
前記第1の穴のアレイからずらして第2の穴のアレイを形成し、これにより、ライニングを施された前記アクティブ層の前記第1の穴のアレイのうちの穴の間のワード線方向のエクステンションを分断して、第1の方向に延在するライニングを施された水平アクティブ線を形成し、前記アクティブ材料を、前記ライニングを施された水平アクティブ線によって貫通される垂直スライスに分離することと、
を含むメモリの製造方法。 - 前記ライニングを施すことの前に、前記パターニングされたアクティブ層の縁部を丸めることを含む、
請求項8に記載の方法。 - 前記メモリ膜は多層誘電体電荷トラッピング構造を含み、前記水平アクティブ線は半導体を含み、前記垂直スライスは半導体を含む、
請求項8に記載の方法。 - 前記アクティブ層のうちの少なくとも1つは、前記スタックの前記アクティブ層のうちの他の少なくとも1つの厚さと異なる厚さを有する、
請求項8に記載の方法。 - 前記水平アクティブ線は、波形形状の対向する側部を有する、
請求項8に記載の方法。 - 前記第1の穴のアレイのうちの穴は円形、矩形、又は楕円形である、
請求項8に記載の方法。
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