JP7013493B2 - 3次元メモリデバイスの相互接続構造 - Google Patents
3次元メモリデバイスの相互接続構造 Download PDFInfo
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- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 27
- 229910021420 polycrystalline silicon Inorganic materials 0.000 claims description 18
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- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 claims description 4
- 229910052719 titanium Inorganic materials 0.000 claims description 4
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 4
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- 239000010703 silicon Substances 0.000 description 16
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- 229910052782 aluminium Inorganic materials 0.000 description 12
- 229910052802 copper Inorganic materials 0.000 description 12
- 229910021332 silicide Inorganic materials 0.000 description 12
- FVBUAEGBCNSCDD-UHFFFAOYSA-N silicide(4-) Chemical compound [Si-4] FVBUAEGBCNSCDD-UHFFFAOYSA-N 0.000 description 12
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- 229910021421 monocrystalline silicon Inorganic materials 0.000 description 3
- JBRZTFJDHDCESZ-UHFFFAOYSA-N AsGa Chemical compound [As]#[Ga] JBRZTFJDHDCESZ-UHFFFAOYSA-N 0.000 description 2
- 229910000577 Silicon-germanium Inorganic materials 0.000 description 2
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- LEVVHYCKPQWKOP-UHFFFAOYSA-N [Si].[Ge] Chemical compound [Si].[Ge] LEVVHYCKPQWKOP-UHFFFAOYSA-N 0.000 description 1
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- 239000010941 cobalt Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
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Description
この出願は、2017年3月8日に出願された中国特許出願第201710134788.9号の優先権を主張し、その全体が参照により本明細書に組み込まれる。
104 ビット線(BL)TAC領域
106 階段TAC領域
110 NANDストリング領域
112 NANDストリング
114 スリット構造
120 TAC領域
122 ダミーチャネル構造
124 バリア構造
126 TAC
130 上部選択ゲート(TSG)階段領域
132 TSGコンタクト
140 階段領域
142 ワード線コンタクト
200 3Dメモリデバイス
202 基板
204 NANDストリング
206 導体層
208 誘電体層
210 交互導体/誘電体スタック
212 階段構造
214 交互誘電体スタック
216 交互層スタック
218 チャネル構造
220 半導体チャネル
222 メモリフィルム
224 エピタキシャルプラグ
226 エッチング停止プラグ
228 スリット構造
230 ドープ領域
232 誘電体層
234 誘電体層
235 バリア構造
236 TAC
238 NANDストリングコンタクト
240 スリット構造コンタクト
242 ワード線コンタクト
242-1 上部ワード線コンタクト
242-2 下部ワード線コンタクト
244 コンタクト層
246 相互接続導体層
248 コンタクト
250 コンタクト
252 ビットライン
402 内側領域
404 外側領域
502 リセス
802 誘電体層
1002 誘電体層
1004 誘電体層
Claims (18)
- 基板、
前記基板上の交互層スタックであって、前記交互層スタックが階段構造を含む、交互層スタック、
前記交互層スタックを通って垂直に延びるバリア構造であって、前記交互層スタックが、(i)少なくとも前記バリア構造によって横方向に完全に囲まれた複数の誘電体層対を含む交互誘電体スタック、及び、(ii)複数の導体/誘電体層対を含む交互導体/誘電体スタックを含む、バリア構造、
各々が前記交互導体/誘電体スタックを通って垂直に延びるチャネル構造、ダミーチャネル構造及びスリット構造、
前記チャネル構造の端部のエッチング停止層、及び
複数の第1のコンタクトであって、(i)前記階段構造の交互導体/誘電体スタックの導体層、(ii)前記エッチング停止層、及び、(iii)前記スリット構造の各々が、前記複数の第1のコンタクトの1つに接触している複数の第1のコンタクト
を備える、3次元(3D)NANDメモリデバイス。 - 前記エッチング停止層が、ポリシリコン、チタン、窒化チタン及びタングステンのうちの1つ以上を含む、請求項1に記載のメモリデバイス。
- 前記バリア構造が、酸化シリコン及び窒化シリコンを含む、請求項1に記載のメモリデバイス。
- 前記複数の誘電体層対の各々が、酸化シリコン層及び窒化シリコン層を含み、前記複数の導体/誘電体層対の各々が、金属層及び酸化シリコン層を含む、請求項1に記載のメモリデバイス。
- 相互接続導体層と、複数の第2のコンタクトを含むコンタクト層とをさらに備え、(i)前記階段構造の交互導体/誘電体スタックの導体層、(ii)前記チャネル構造、及び、(iii)前記スリット構造の各々が、対応する第1のコンタクト及び前記複数の第2のコンタクトのそれぞれの1つによって前記相互接続導体層に電気的に接続される、請求項1に記載のメモリデバイス。
- 少なくとも前記バリア構造によって横方向に囲まれた前記交互誘電体スタックを通って垂直に延びる第3のコンタクトをさらに備える、請求項1に記載のメモリデバイス。
- 複数の誘電体層対を含む交互誘電体スタックであって、前記複数の誘電体層対の各々が、第1の誘電体層、及び、前記第1の誘電体層とは異なる第2の誘電体層を含む、交互誘電体スタックを、基板上に形成する段階、
前記交互誘電体スタックに第1の階段構造を形成する段階、
前記交互誘電体スタックを通って垂直に各々が延びるチャネル構造、ダミーチャネル構造及びバリア構造を形成する段階であって、前記バリア構造が、前記交互誘電体スタックを、少なくとも前記バリア構造によって横方向に囲まれた第1の部分と、前記第1の階段構造を含む第2の部分とに分離する、段階、
前記チャネル構造の上端にエッチング停止層を形成する段階、
複数の導体/誘電体層対を含む交互導体/誘電体スタックを形成するように、スリットを形成し、前記スリットを通じて、前記交互誘電体スタックの第2の部分内の第1の誘電体層を導体層と置き換える段階、
前記スリットに導体を堆積させることによってスリット構造を形成する段階、及び
複数の第1のコンタクトを形成する段階であって、(i)前記第1の階段構造の交互導体/誘電体スタックの第1導体層、(ii)前記エッチング停止層、及び、(iii)スリット構造の各々が、前記複数の第1のコンタクトの1つに接触している、複数の第1のコンタクトを形成する段階、
を含む、三次元(3D)NANDメモリデバイスを形成する方法。 - 複数の第2のコンタクトを形成する段階をさらに含み、前記複数の第2のコンタクトの1つが、少なくとも前記バリア構造によって横方向に囲まれた交互誘電体スタックの第1の部分を通って垂直に延び、前記複数の第2のコンタクトの他の1つが、前記第1の階段構造の交互導体/誘電体スタックの第2の導電層に接触している、請求項7に記載の方法。
- 複数の第3のコンタクトを含むコンタクト層、及び、前記コンタクト層の上の相互接続導体層をさらに備え、(i)前記第1の階段構造の交互導体/誘電体スタックの第1の導体層、(ii)前記チャネル構造、及び、(iii)前記スリット構造の各々が、対応する第1のコンタクト、及び、前記複数の第3のコンタクトのそれぞれの1つによって前記相互接続導体層に電気的に接続される、請求項8に記載の方法。
- スリットを形成する前に、前記基板にドープ領域を形成する段階をさらに含み、前記スリット構造が、前記ドープ領域に接触している、請求項7に記載の方法。
- 前記バリア構造に隣接する前記交互誘電体スタックに第2の階段構造を形成する段階をさらに含む、請求項7に記載の方法。
- 基板、
前記基板上の交互層スタックであって、前記交互層スタックが階段構造を含む、交互層スタック、
前記交互層スタックを通って垂直に延びるバリア構造であって、前記交互層スタックが、(i)少なくとも前記バリア構造によって横方向に完全に囲まれた複数の誘電体層対を含む交互誘電体スタック、及び、(ii)複数の導体/誘電体層対を含む交互導体/誘電体スタックを含む、バリア構造、
前記交互導体/誘電体スタックを通って各々が垂直に延びるNANDストリング、ダミーチャネル構造及びスリット構造、及び
複数の第1のコンタクトであって、前記第1のコンタクトの各々のそれぞれの第1の端部で互いに同一面にある複数の第1のコンタクトであり、(i)前記階段構造の交互導体/誘電体スタックの導体層、(ii)前記NANDストリング、及び、(iii)前記スリット構造の各々が、前記複数の第1のコンタクトのそれぞれの第2の端部に接触している、複数の第1のコンタクト
を備える、3次元(3D)NANDメモリデバイス。 - 複数の第2のコンタクトを含むコンタクト層であって、前記第2のコンタクトの各々のそれぞれの第1の端部及びそれぞれの第2の端部で互いに同一面にある複数の第2のコンタクトを含むコンタクト層をさらに備え、前記複数の第2のコンタクトの各々が、前記複数の第1のコンタクトのそれぞれの1つに接触している、請求項12に記載のメモリデバイス。
- 複数の相互接続線を含む相互接続導体層をさらに備え、前記複数の第2のコンタクトの各々が、前記複数の相互接続線のそれぞれの1つに接触している、請求項13に記載のメモリデバイス。
- 前記複数の相互接続線が、対応する第1のコンタクト及び対応する第2のコンタクトによって前記NANDストリングに電気的に接続されたビット線を含む、請求項14に記載のメモリデバイス。
- 前記複数の第1のコンタクトが、前記交互誘電体スタックを通って垂直に延びる貫通アレイコンタクト(TAC)を含む、請求項12に記載のメモリデバイス。
- 前記NANDストリングが、対応する第1のコンタクトに接触するプラグを含む、請求項12に記載のメモリデバイス。
- 前記プラグが、ポリシリコン及び金属のうちの少なくとも1つを含む、請求項17に記載のメモリデバイス。
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