JP7601950B2 - 新規の3d nandメモリデバイスおよびそれを形成する方法 - Google Patents
新規の3d nandメモリデバイスおよびそれを形成する方法 Download PDFInfo
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- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 2
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- CJNBYAVZURUTKZ-UHFFFAOYSA-N hafnium(iv) oxide Chemical compound O=[Hf]=O CJNBYAVZURUTKZ-UHFFFAOYSA-N 0.000 description 1
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- 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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- H10B41/23—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates 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
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- H10D62/213—Channel regions of field-effect devices
- H10D62/221—Channel regions of field-effect devices of FETs
- H10D62/235—Channel regions of field-effect devices of FETs of IGFETs
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- H10D84/0123—Integrating together multiple components covered by H10D12/00 or H10D30/00, e.g. integrating multiple IGBTs
- H10D84/0126—Integrating together multiple components covered by H10D12/00 or H10D30/00, e.g. integrating multiple IGBTs the components including insulated gates, e.g. IGFETs
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- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
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Description
いくつかの実施形態では、ダミーチャネル構造は、階段領域が形成される前に形成され得る。いくつかの実施形態では、ダミーチャネル構造は、コア領域の中に形成され得る。したがって、ダミーチャネル構造は、BSG、ダミーBSG、複数のワードライン、ダミーTSG、TSG、および複数の絶縁層を通過して基板の中に延びることができる。いくつかの実施形態では、ダミーチャネル構造は、チャネル構造と一緒に形成されて、チャネル構造と同様の構造を有することができる。たとえば、ダミーチャネル構造は、障壁層、トラップ層、トンネル層、およびチャネル層を含むこともできる。
12 ディープN型ウェル、ドープ領域
14 高電圧P型ウェル(HVPW)、ドープ領域
16 高電圧N型ウェル(HVNW)、ドープ領域
18 N+領域、ドープ領域
20 HVNW、ドープ領域
22 N+領域、ドープ領域
24 ドープ領域
24a P+領域
24b P+領域
26 第1の誘電体溝
28 第1の誘電体溝
30 チャネル構造
32 チャネル構造
34 チャネル構造
36 チャネル構造
38 チャネル構造
40 ダミーチャネル構造
42 ダミーチャネル構造
44 ダミーチャネル構造
46 ダミーチャネル構造
48 ダミーチャネル構造
50 ダミーチャネル構造
52 共通ソース領域(CSR)
52a CSR
52a’ CSR
52b CSR
52b’ CSR
52c CSR
52c’ CSR
52a-1 サブCSR
52a-1’ サブCSR
52a-2 サブCSR
52a-2’ サブCSR
54 ドープ領域
56 第2の誘電体溝
58 第2の誘電体溝
60 絶縁層
60a~60q 絶縁層
60a-A 終端部
60a-B 終端部
60b-A 終端部
60b-B 終端部
62a 頂部選択ゲート(TSG)
62b 頂部ダミーワードライン
62c 頂部ダミーワードライン
62d~62m ワードライン
62n 底部ダミーワードライン
62o 底部ダミーワードライン
62p 底部選択ゲート(BSG)
62a-1 サブTSG
62a-2 サブTSG
62a-3 サブTSG
62b-1 サブダミーTSG
62c-1 サブダミーTSG
62n-1 サブダミーBSG
62o-1 サブダミーBSG
62o-2 サブダミーBSG
62o-3 サブダミーBSG
62p-1 サブBSG
62p-2 サブBSG
62p-3 サブBSG
64 頂部接点
68 誘電体スペーサ
70 導電層
72 Hカット
100 3D-NANDメモリデバイス
100A 階段領域
100B コア領域
100C 階段領域
202 底部チャネル接点
204 チャネル絶縁層
206 チャネル層
208 トンネル層
210 電荷トラップ層
212 障壁層
214 頂部チャネル接点
216 ゲート誘電体層
702 パターンマスクスタック
Claims (20)
- 交互のゲートライン層と絶縁層のスタックであって、前記スタックがアレイ領域を含み、前記ゲートライン層が底部選択ゲート(BSG)を含み、ダミー底部選択ゲート(DUMBSG)層が前記底部選択ゲート(BSG)と前記他のゲートライン層との間に形成される、スタックと、
前記ゲートライン層の前記底部選択ゲート(BSG)の中に形成され、前記スタックの長さ方向に延びて前記底部選択ゲート(BSG)をサブ底部選択ゲート(BSG)に区分する第1の誘電体溝と、を含み、
前記第1の誘電体溝は、前記ダミー底部選択ゲート(DUMBSG)層をサブダミー底部選択ゲート層に区分けし、
前記第1の誘電体溝は、前記底部選択ゲート(BSG)と前記ダミー底部選択ゲート(DUMBSG)層との間の絶縁層に延びる、メモリデバイス。 - 前記スタックの前記長さ方向に延びる第1の共通ソース領域(CSR)を含み、前記第1の共通ソース領域(CSR)が、前記スタックの高さ方向に前記ゲートライン層および前記絶縁層を通ってさらに延び、
前記第1の共通ソース領域(CSR)が、前記第1の誘電体溝の2つの隣接する第1の誘電体溝の間に配列される、請求項1に記載のメモリデバイス。 - 前記ゲートライン層が、前記底部選択ゲート(BSG)の上に設置された頂部選択ゲート(TSG)をさらに含む、請求項2に記載のメモリデバイス。
- 前記ゲートライン層の前記頂部選択ゲート(TSG)の中に形成され、前記スタックの前記長さ方向に延びて前記頂部選択ゲート(TSG)をサブ頂部選択ゲート(TSG)に区分する第2の誘電体溝をさらに含む、請求項3に記載のメモリデバイス。
- 前記スタックが、互いに隣接して設置され、前記スタックの長さ方向に配列されたアレイ領域および第1の階段領域をさらに含む、請求項2に記載のメモリデバイス。
- 前記スタックが、第2の階段領域をさらに含み、前記アレイ領域が、前記スタックの前記長さ方向に前記第1の階段領域と前記第2の階段領域との間に設置される、請求項5に記載のメモリデバイス。
- 前記メモリデバイスが、前記スタックの前記長さ方向に延び、前記スタックの前記高さ方向に前記ゲートライン層および前記絶縁層を通ってさらに延びる第2の共通ソース領域(CSR)および第3の共通ソース領域(CSR)をさらに含み、
前記第2の共通ソース領域(CSR)、前記第1の共通ソース領域(CSR)および前記第3の共通ソース領域(CSR)が、前記スタックの幅方向に順次的に配列され、それにより、前記第1の誘電体溝の前記2つの隣接する第1の誘電体溝が、前記第2の共通ソース領域(CSR)と前記第3の共通ソース領域(CSR)との間に配列され、
前記第2の共通ソース領域(CSR)、前記第1の共通ソース領域(CSR)および前記第3の共通ソース領域(CSR)が、前記スタックの前記長さ方向に互いに平行に延び、
前記第2の共通ソース領域(CSR)、前記第1の共通ソース領域(CSR)および前記第3の共通ソース領域(CSR)が、前記スタックの前記長さ方向に順次、前記第1の階段領域、前記アレイ領域、および前記第2の階段領域を通って延びる、請求項6に記載のメモリデバイス。 - 前記第1の共通ソース領域(CSR)が、前記スタックの前記長さ方向に整列された第1の部分および第2の部分を含む不連続プロファイルを有する、請求項2に記載のメモリデバイス。
- 前記スタックの前記高さ方向に前記ゲートライン層および前記絶縁層を通って延び、前記アレイ領域の中に設置され、前記第2の共通ソース領域(CSR)と前記第3の共通ソース領域(CSR)との間に配列されるチャネル構造をさらに含む、請求項7に記載のメモリデバイス。
- 前記スタックの前記高さ方向に前記ゲートライン層および前記絶縁層を通って延び、前記第1の階段領域および前記第2の階段領域の中に設置され、前記第2の共通ソース領域(CSR)と前記第3の共通ソース領域(CSR)との間に配列されるダミーチャネル構造をさらに含む、請求項7に記載のメモリデバイス。
- 前記第1の共通ソース領域(CSR)が、前記第2の誘電体溝の2つの隣接する第2の誘電体溝の間に配列される、請求項4に記載のメモリデバイス。
- 前記頂部選択ゲート(TSG)が、前記ゲートライン層の最上ゲートライン層である、請求項3に記載のメモリデバイス。
- 前記底部選択ゲート(BSG)が、前記ゲートライン層の最下ゲートライン層である、請求項1に記載のメモリデバイス。
- 前記第1の誘電体溝が、前記スタックの前記長さ方向に、前記第1の階段領域、前記アレイ領域、および前記第2の階段領域を通って延びる、請求項6に記載のメモリデバイス。
- 前記第2の誘電体溝が、前記スタックの前記長さ方向に前記アレイ領域を通って延びる、請求項4に記載のメモリデバイス。
- メモリデバイスを製造するための方法であって、
第1の絶縁層の上に底部選択ゲート(BSG)層を形成するステップと、
前記底部選択ゲート(BSG)層及び前記第1の絶縁層を通過して前記第1の絶縁層の長さ方向に延びる1つまたは複数の第1の誘電体溝を形成するステップであって、前記底部選択ゲート(BSG)層が前記1つまたは複数の第1の誘電体溝によってサブBSG層に区分けされる、ステップと、
前記底部選択ゲート(BSG)層の上にゲートライン層及び第2の絶縁層を形成するステップであって、前記第2の絶縁層が前記底部選択ゲート(BSG)層と前記ゲートライン層との間に配される、ステップと、
を含む、方法。 - 前記第2の絶縁層の上に、前記第2の絶縁層の長さ方向に延びる1つまたは複数の共通ソース領域を形成するステップであって、前記1つまたは複数の共通ソース領域の各々が、前記底部選択ゲート(BSG)層、前記第1の絶縁層、前記ゲートライン層及び前記第2の絶縁層を通って延びる、ステップをさらに含む、請求項16に記載の方法。
- 前記ゲートライン層の上に頂部選択ゲート(TSG)層を形成するステップであって、前記頂部選択ゲート(TSG)層及び前記ゲートライン層が前記第2の絶縁層によって離隔される、ステップをさらに含む、請求項17に記載の方法。
- 前記1つまたは複数の共通ソース領域の各々がさらに、前記底部選択ゲート(BSG)層、前記第1の絶縁層、前記ゲートライン層、前記第2の絶縁層、及び前記頂部選択ゲート(TSG)層に延びる、請求項18に記載の方法。
- 前記第1の絶縁層の長さ方向に延び、前記頂部選択ゲート(TSG)層、及び、互いに最上部のゲートライン層と前記頂部選択ゲート(TSG)層とを区分けする前記第2の絶縁層の一部を通過する、1つまたは複数の第2の誘電体溝を形成するステップであって、前記第1の誘電体溝及び前記第2の誘電体溝が、前記第1の絶縁層の幅方向において互いに整列され、前記ゲートライン層によって離隔され、前記頂部選択ゲート(TSG)層が、前記1つまたは複数の第2の誘電体溝によってサブTSG層に区分けされる、ステップをさらに含む、請求項18に記載の方法。
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