JP7313489B2 - 3次元メモリデバイスのローカルコンタクトおよびそれを形成するための方法 - Google Patents
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Description
102 基板
104 メモリスタック
106 チャネル構造
108 スリット構造
110 ローカルコンタクト層
112 チャネルローカルコンタクト
114 スリットローカルコンタクト
116 スペーサ
118 ソースコンタクト
200 3Dメモリデバイス
202 基板
204 チャネル構造
206 導電層
208 誘電層
210 メモリスタック
212 半導体チャネル
214 メモリフィルム
216 キャッピング層
218 半導体プラグ
220 チャネルプラグ
222 ローカルコンタクト層
224 チャネルローカルコンタクト
226 スリット構造
228 コンタクト
228-1 下側コンタクト部分
228-2 上側コンタクト部分
230 スペーサ
232 ドープされた領域
402 シリコン基板
404 誘電体スタック
406 犠牲層
408 誘電層
410 チャネル構造
412 半導体プラグ
414 メモリフィルム
416 半導体チャネル
418 キャッピング層
420 チャネルプラグ
422 ローカル誘電層
424 ローカルコンタクトホール
425 犠牲材料
426 スリット開口
428 頂部
430 犠牲プラグ
432 導電層
434 メモリスタック
436 ドープされた領域
438 スペーサ
442-1 下側コンタクト部分
442-2 上側コンタクト部分
444 コンタクト材料
446 チャネルローカルコンタクト
448 スリット構造
Claims (20)
- 3次元(3D)メモリデバイスを形成するための方法であって、
基板の上に交互配置された犠牲層および誘電層を備える誘電体スタックを貫通して垂直に延びるチャネル構造を形成するステップと、
前記チャネル構造の上にあり前記チャネル構造と接触している犠牲プラグを形成するステップと、
前記誘電体スタックを貫通して垂直に延びるスリット開口を形成するステップと、
前記スリット開口を通じて前記犠牲層を導電層で置き換えることによって、交互配置された前記導電層および前記誘電層を備えるメモリスタックを形成するステップと、
前記スリット開口に第1のコンタクト部分を形成するステップであって、前記スリット開口の側壁の上にスペーサを形成するステップであって、前記スペーサが、前記導電層に形成されるエッチバック凹部のうちの1つまたは複数を備える、ステップと、前記スリット開口の中の前記スペーサへと第1のコンタクト材料を堆積するステップとを備える、ステップと、
前記チャネル構造を露出するために、前記第1のコンタクト部分を形成した後で前記犠牲プラグを取り除くステップと、
(i)前記チャネル構造の上にあり前記チャネル構造と接触しているチャネルローカルコンタクト、および(ii)前記スリット開口の中の前記第1のコンタクト部分の上にある第2のコンタクト部分を同時に形成するステップとを備える、方法。 - 前記チャネル構造を形成するステップが、
前記誘電体スタックを貫通して垂直に延びるチャネルホールをエッチングするステップと、
前記チャネルホールの側壁を覆ってメモリフィルムおよび半導体チャネルを続いて形成するステップと、
前記半導体チャネルの上に前記半導体チャネルと接触してチャネルプラグを形成するステップとを備える、請求項1に記載の方法。 - 前記犠牲プラグを形成するステップが、
前記誘電体スタックにローカル誘電層を形成するステップと、
前記チャネル構造を露出するために、前記ローカル誘電層を貫通してローカルコンタクトホールをエッチングするステップと、
前記チャネルプラグの材料と異なる犠牲材料を前記ローカルコンタクトホールへと堆積するステップとを備える、請求項2に記載の方法。 - 前記犠牲材料が窒化シリコンを備える、請求項3に記載の方法。
- 前記スリット開口を形成するステップが、
前記ローカル誘電層および前記誘電体スタックを貫通して垂直に延びる前記スリット開口をエッチングするステップと、
前記スリット開口の上部を拡大するステップとを備える、請求項3または4に記載の方法。 - 前記スリット開口に前記第1のコンタクト部分を形成するステップが、
前記第1のコンタクト部分の上端が前記スリット開口の前記上部の下にあるように、前記スリット開口において前記第1のコンタクト材料をエッチバックするステップをさらに備える、請求項5に記載の方法。 - 前記第1のコンタクト材料がポリシリコンを備える、請求項6に記載の方法。
- 前記チャネルローカルコンタクトおよび前記第2のコンタクト部分を同時に形成するステップが、
第2のコンタクト材料を前記ローカルコンタクトホールおよび前記スリット開口へと同時に堆積するステップと、
前記チャネルローカルコンタクトの上端が前記第2のコンタクト部分の上端と同一平面にあるように、前記堆積された第2のコンタクト材料を平坦化するステップとを備える、請求項3に記載の方法。 - 前記第2のコンタクト材料がタングステンを備える、請求項8に記載の方法。
- 3次元(3D)メモリデバイスであって、
基板と、
前記基板の上に交互配置された導電層および誘電層を備えるメモリスタックと、
前記メモリスタックを貫通して垂直に延びるチャネル構造と、
前記チャネル構造の上にあり前記チャネル構造と接触しているチャネルローカルコンタクトと、
前記メモリスタックを貫通して垂直に延びるスリット構造とを備え、
前記スリット構造がスペーサおよびコンタクトを備え、前記スペーサが、前記導電層に形成されるエッチバック凹部のうちの1つまたは複数を備え、前記コンタクトが、前記スリット構造の底部に、かつ前記スペーサに接して形成される第1のコンタクト部分と、前記第1のコンタクト部分と異なる材料を有する前記第1のコンタクト部分の上に形成される第2のコンタクト部分とを備え、前記第2のコンタクト部分は、前記スペーサに接して形成され、前記スリット構造の前記第2のコンタクト部分および前記チャネルローカルコンタクトが同じ導電性材料を備える、3次元メモリデバイス。 - 前記スリット構造の前記第1のコンタクト部分がポリシリコンを備え、前記スリット構造の前記第2のコンタクト部分および前記チャネルローカルコンタクトが同じ金属を備える、請求項10に記載の3次元メモリデバイス。
- 前記金属がタングステンを備える、請求項11に記載の3次元メモリデバイス。
- 前記スリット構造が、前記スリット構造の前記コンタクトと前記メモリスタックの前記導電層との間の横方向の前記スペーサを備える、請求項10から12のいずれか一項に記載の3次元メモリデバイス。
- 前記スリット構造の前記第2のコンタクト部分の上端が、平面視において前記スペーサの境界を超えない、請求項13に記載の3次元メモリデバイス。
- 前記第2のコンタクト部分の上端の直径が、前記スペーサの外径より大きくない、請求項13に記載の3次元メモリデバイス。
- 前記第2のコンタクト部分の前記上端の前記直径が、前記チャネルローカルコンタクトの直径より大きい、請求項15に記載の3次元メモリデバイス。
- 前記チャネル構造が半導体チャネルおよびメモリフィルムを備える、請求項10に記載の3次元メモリデバイス。
- 前記チャネル構造が、前記チャネル構造の上部にあり前記チャネルローカルコンタクトと接触しているチャネルプラグを備える、請求項10に記載の3次元メモリデバイス。
- 前記スリット構造の前記第2のコンタクト部分の上端が前記チャネルローカルコンタクトの上端と同一平面にある、請求項10に記載の3次元メモリデバイス。
- 前記第2のコンタクト部分の上端の直径が、前記第1のコンタクト部分の上端の直径より大きく、前記スペーサの外径より大きくない、請求項10に記載の3次元メモリデバイス。
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- 2020-01-20 WO PCT/CN2020/073107 patent/WO2021146827A1/en unknown
- 2020-01-20 EP EP20915213.1A patent/EP3963630B1/en active Active
- 2020-01-20 CN CN202080000173.7A patent/CN111279479B/zh active Active
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US20230171961A1 (en) | 2023-06-01 |
EP3963630B1 (en) | 2023-12-27 |
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US20210272982A1 (en) | 2021-09-02 |
EP3963630A4 (en) | 2022-12-21 |
CN111279479A (zh) | 2020-06-12 |
CN111279479B (zh) | 2021-07-09 |
TW202129929A (zh) | 2021-08-01 |
US11600633B2 (en) | 2023-03-07 |
CN113488475A (zh) | 2021-10-08 |
JP2022539106A (ja) | 2022-09-07 |
EP3963630A1 (en) | 2022-03-09 |
US20210225863A1 (en) | 2021-07-22 |
WO2021146827A1 (en) | 2021-07-29 |
KR20220012342A (ko) | 2022-02-03 |
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