JP7311646B2 - 三次元メモリデバイスおよびその形成方法 - Google Patents
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- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 description 1
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- FVBUAEGBCNSCDD-UHFFFAOYSA-N silicide(4-) Chemical compound [Si-4] FVBUAEGBCNSCDD-UHFFFAOYSA-N 0.000 description 1
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B43/00—EEPROM devices comprising charge-trapping gate insulators
- H10B43/20—EEPROM devices comprising charge-trapping gate insulators characterised by three-dimensional arrangements, e.g. with cells on different height levels
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/40—Electrodes ; Multistep manufacturing processes therefor
- H01L29/41—Electrodes ; Multistep manufacturing processes therefor characterised by their shape, relative sizes or dispositions
- H01L29/417—Electrodes ; Multistep manufacturing processes therefor characterised by their shape, relative sizes or dispositions carrying the current to be rectified, amplified or switched
- H01L29/41725—Source or drain electrodes for field effect devices
- H01L29/41741—Source or drain electrodes for field effect devices for vertical or pseudo-vertical devices
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- 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
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/77—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate
- H01L21/78—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices
- H01L21/82—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices to produce devices, e.g. integrated circuits, each consisting of a plurality of components
- H01L21/822—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices to produce devices, e.g. integrated circuits, each consisting of a plurality of components the substrate being a semiconductor, using silicon technology
- H01L21/8232—Field-effect technology
- H01L21/8234—MIS technology, i.e. integration processes of field effect transistors of the conductor-insulator-semiconductor type
- H01L21/823487—MIS technology, i.e. integration processes of field effect transistors of the conductor-insulator-semiconductor type with a particular manufacturing method of vertical transistor structures, i.e. with channel vertical to the substrate surface
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B43/00—EEPROM devices comprising charge-trapping gate insulators
- H10B43/20—EEPROM devices comprising charge-trapping gate insulators characterised by three-dimensional arrangements, e.g. with cells on different height levels
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B43/00—EEPROM devices comprising charge-trapping gate insulators
- H10B43/30—EEPROM devices comprising charge-trapping gate insulators characterised by the memory core region
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- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
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- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
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Description
Claims (26)
- 3Dメモリデバイスであって、
P型ドープ領域を含む基板と、
前記基板上のN型ドープ半導体層と、
前記N型ドープ半導体層上のインターリーブされた導電層および誘電体層を含むメモリスタックと、
前記N型ドープ半導体層および前記P型ドープ領域の中に垂直に延びるN型ドープ半導体プラグと、
前記メモリスタックおよび前記N型ドープ半導体層を通って垂直に延びるチャネル構造と、
前記メモリスタックを通って前記N型ドープ半導体プラグと接触するように垂直に延びるソース接触構造と、
前記ソース接触構造と前記メモリスタックとの間に横方向に配置されたスペーサ構造と
を含み、
前記N型ドープ半導体プラグは前記N型ドープ半導体層によって囲まれている、3Dメモリデバイス。 - 前記N型ドープ半導体層が前記P型ドープ領域上にある、請求項1に記載の3Dメモリデバイス。
- 前記チャネル構造が前記P型ドープ領域の中に垂直に延びる、請求項1に記載の3Dメモリデバイス。
- 前記N型ドープ半導体プラグの横方向の寸法が、前記ソース接触構造の横方向の寸法よりも大きい、請求項1に記載の3Dメモリデバイス。
- 前記N型ドープ半導体プラグが単結晶シリコンを含む、請求項1に記載の3Dメモリデバイス。
- 前記N型ドープ半導体層がポリシリコンを含む、請求項1に記載の3Dメモリデバイス。
- 前記N型ドープ半導体層は、均一なドーピング濃度プロファイルの単一のポリシリコン層である、請求項6に記載の3Dメモリデバイス。
- 前記N型ドープ半導体層のドーピング濃度は、1017cm-3~1021cm-3である、請求項7に記載の3Dメモリデバイス。
- 前記基板がP型シリコン基板である、請求項1に記載の3Dメモリデバイス。
- 前記基板はN型シリコン基板であり、前記P型ドープ領域はPウェルである、請求項1に記載の3Dメモリデバイス。
- 前記チャネル構造が、メモリ膜および半導体チャネルを含み、前記チャネル構造の側壁に沿った前記半導体チャネルの一部は、前記N型ドープ半導体層と接触している、請求項1に記載の3Dメモリデバイス。
- 前記ソース接触構造は、前記N型ドープ半導体プラグの上方にあって接触しているソース接触部を含む、請求項1に記載の3Dメモリデバイス。
- 前記N型ドープ半導体層の厚さは、30nm~100nmである、請求項1に記載の3Dメモリデバイス。
- 前記チャネル構造と前記N型ドープ半導体プラグとの間の横方向の距離が、40nm~100nmである、請求項1に記載の3Dメモリデバイス。
- 前記チャネル構造が前記P型ドープ領域内に延びる深さは、50nm~150nmである、請求項3に記載の3Dメモリデバイス。
- 前記P型ドープ領域によって囲まれた前記N型ドープ半導体プラグの一部の横方向の寸法が、前記N型ドープ半導体層によって囲まれた前記N型ドープ半導体プラグの一部の横方向の寸法よりも大きい、請求項1に記載の3Dメモリデバイス。
- 三次元(3D)メモリデバイスを形成するための方法であって、
P型ドープ領域を含む基板に凹部を形成することとであって、前記P型ドープ領域内に前記凹部を形成することを含む、凹部を形成することと、
続いて、前記基板上および前記凹部内に犠牲層を形成し、前記犠牲層上に誘電体スタックを形成することと、
前記誘電体スタックおよび前記犠牲層を通って垂直に延在するチャネル構造を形成することと、
前記誘電体スタックを通って前記凹部内の前記犠牲層の中に垂直に延在する開口部を形成することと、
前記開口部を介して、前記基板と前記誘電体スタックとの間のN型ドープ半導体層で前記犠牲層を置換することと、
前記凹部の側壁に沿って誘電体を含むスペーサ構造を形成することと、
前記凹部内に、前記N型ドープ半導体層および前記P型ドープ領域の中に垂直に延びるN型ドープ半導体プラグを形成することと、N型ドープ半導体プラグを形成することを含み、
前記N型ドープ半導体プラグは前記N型ドープ半導体層によって囲まれている、方法。 - 前記基板上に前記犠牲層を形成することは、前記基板内のP型ドープ領域上に犠牲層を形成することをさらに含む、請求項17に記載の方法。
- 前記誘電体スタックおよび前記犠牲層を通って垂直に延びる前記チャネル構造を形成することは、前記誘電体スタックおよび前記犠牲層を通って前記P型ドープ領域の中に垂直に延びる前記チャネル構造を形成することを含む、請求項17に記載の方法。
- 前記N型ドープ半導体プラグを形成した後に、
前記チャネル構造がメモリスタックおよび前記N型ドープ半導体層を通ってP型ドープ領域の中に垂直に延在するように、前記開口部を介して前記誘電体スタックを前記メモリスタックと置き換えることをさらに含む、請求項17に記載の方法。 - 前記スペーサ構造上に、前記N型ドープ半導体プラグと接触するようにソース接触構造を形成することをさらに含む、請求項17に記載の方法。
- 前記凹部の横方向の寸法が、前記開口部の横方向の寸法よりも大きい、請求項17に記載の方法。
- 前記チャネル構造を形成することは、
前記誘電体スタックおよび前記犠牲層を通って前記P型ドープ領域の中に垂直に延びるチャネルホールを形成することと、
続いてメモリ膜および半導体チャネルを、前記チャネルホールの側壁に沿って形成することと
を含む、請求項17に記載の方法。 - 前記犠牲層を前記N型ドープ半導体層で置き換えることが、
前記犠牲層を除去して前記P型ドープ領域と前記誘電体スタックとの間にキャビティを形成することと、
前記メモリ膜の一部を除去して前記チャネルホールの前記側壁に沿って前記半導体チャネルの一部を露出させることと、
N型ドープポリシリコンを前記キャビティの中に堆積させて、前記N型ドープ半導体層を形成することと
を含む、請求項23に記載の方法。 - 前記N型ドープポリシリコンを前記キャビティの中に堆積させることは、前記N型ドープポリシリコンを、前記キャビティを充填するために均一なドーピング濃度プロファイルで、in-situドーピングすることを含む、請求項24に記載の方法。
- 前記N型ドープ半導体プラグを形成することは、
前記凹部を充填するように単結晶シリコンをエピタキシャル成長させることと、
前記単結晶シリコンをin-situドーピングすることとを含む、請求項17に記載の方法。
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EP3963632A4 (en) | 2022-12-14 |
KR102674861B1 (ko) | 2024-06-12 |
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US20220093645A1 (en) | 2022-03-24 |
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