JP2022539284A - 3次元メモリデバイスを形成するための方法 - Google Patents
3次元メモリデバイスを形成するための方法 Download PDFInfo
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- JP2022539284A JP2022539284A JP2021561774A JP2021561774A JP2022539284A JP 2022539284 A JP2022539284 A JP 2022539284A JP 2021561774 A JP2021561774 A JP 2021561774A JP 2021561774 A JP2021561774 A JP 2021561774A JP 2022539284 A JP2022539284 A JP 2022539284A
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Abstract
Description
101 基板
102 第1の半導体構造
104 第2の半導体構造
106 接合界面
108 周辺回路
110 接合層
111 接合コンタクト
112 接合層
113 接合コンタクト
114 メモリスタック
116 導電体層
118 誘電体層
120 N型ドープ半導体層
122 半導体プラグ
124 チャネル構造
126 メモリ膜
127 頂部
128 半導体チャネル
129 チャネルプラグ
130 絶縁構造
132 バックサイドソースコンタクト
133 BEOL相互接続層
134 ILD層
136 再配線層
138 パッシベーション層
140 コンタクトパッド
142、144 コンタクト
146、148 周辺コンタクト
150 チャネルローカルコンタクト
152 ワード線ローカルコンタクト
200 3Dメモリデバイス
201 基板
202 第1の半導体構造
204 第2の半導体構造
206 接合界面
208 周辺回路
210 接合層
211 接合コンタクト
212 接合層
213 接合コンタクト
216 導電体層
218 誘電体層
220 P型ドープ半導体層
221 Nウェル
222 半導体プラグ
224 チャネル構造
226 メモリ膜
227 チャネルプラグ
228 半導体チャネル
229 頂部
230 絶縁構造
231、232 バックサイドソースコンタクト
233 BEOL相互接続層
234 ILD層
236 再配線層
236-1 第1の相互接続
236-2 第2の相互接続
238 パッシベーション層
240 コンタクトパッド
242、243、244 コンタクト
246、247、248 周辺コンタクト
250 チャネルローカルコンタクト
252 ワード線ローカルコンタクト
302 キャリア基板
304 犠牲層
306 N型ドープ半導体層
308 誘電体スタック
310 スタック誘電体層
312 スタック犠牲層
314 チャネル構造
315 トンネル層
316 ストレージ層
317 ブロッキング層
318 半導体チャネル
320 スリット
322 外側陥凹部
328 スタック導電体層
330 メモリスタック
332 ゲート誘電体層
334 誘電体キャッピング層
336 絶縁構造
338、340 周辺コンタクト
342 ワード線ローカルコンタクト
344 チャネルローカルコンタクト
346 接合層
348 接合層
350 シリコン基板
352 周辺回路
354 接合界面
356 ILD層
357 陥凹部
358 ソースコンタクト開口部
359 半導体プラグ
360、361 コンタクト開口部
362 スペーサー
364 ソースコンタクト
366、368 コンタクト
370 再配線層
372 パッシベーション層
374 コンタクトバッド
376 相互接続層
402 キャリア基板
404 犠牲層
406 P型ドープ半導体層
407 Nウェル
408 誘電体スタック
410 スタック誘電体層
412 スタック犠牲層
414 チャネル構造
415 トンネル層
416 ストレージ層
417 ブロッキング層
418 半導体チャネル
420 スリット
422 外側陥凹部
428 スタック導電体層
430 メモリスタック
432 ゲート誘電体層
434 誘電体キャッピング層
436 絶縁構造
438、439、440 周辺コンタクト
442 ワード線ローカルコンタクト
444 チャネルローカルコンタクト
446 接合層
448 接合層
450 シリコン基板
452 周辺回路
454 接合界面
456 ILD層
457 陥凹部
458 ソースコンタクト開口部
459 半導体プラグ
460、461、および463 コンタクト開口部
464および478 ソースコンタクト
465 ソースコンタクト開口部
466、468、および469 コンタクト
470 再配線層
470-1 第1の相互接続
470-2 第2の相互接続
472 パッシベーション層
474 コンタクトパッド
476 相互接続層
Claims (28)
- 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、
基板上に犠牲層を、前記犠牲層上にNウェルを有するP型ドープ半導体層を、前記P型ドープ半導体層上に誘電体スタックを、引き続いて形成するステップと、
前記誘電体スタックおよび前記P型ドープ半導体層を垂直方向に貫通するチャネル構造を形成するステップと、
前記誘電体スタックをメモリスタックで置き換えるステップであって、それにより、前記チャネル構造は、前記メモリスタックおよび前記P型ドープ半導体層を垂直方向に貫通する、ステップと、
前記基板および前記犠牲層を除去して、前記チャネル構造の端部を露出するステップと、
前記P型ドープ半導体層に当接する前記チャネル構造の一部を半導体プラグで置き換えるステップとを含む、方法。 - 前記基板はキャリアウェハの一部であり、前記犠牲層は誘電体材料を含み、前記P型ドープ半導体層はポリシリコンを含み、前記誘電体スタックは、交互配置されたスタック誘電体層およびスタック犠牲層を含む、請求項1に記載の方法。
- 前記誘電体スタックを前記メモリスタックで置き換えるステップは、
前記誘電体スタックを垂直方向に貫通する開口部をエッチングするステップであって、前記P型ドープ半導体層で停止する、ステップと、
前記開口部を通して前記スタック犠牲層をスタック導電体層で置き換えて、交互配置された前記スタック誘電体層および前記スタック導電体層を含む前記メモリスタックを形成するステップとを含む、請求項1または2に記載の方法。 - 前記誘電体スタックを前記メモリスタックで置き換えた後に、1つまたは複数の誘電体材料を前記開口部内に堆積して、前記メモリスタックを垂直方向に貫通する絶縁構造を形成するステップをさらに含む、請求項3に記載の方法。
- 前記チャネル構造を形成するステップは、
前記誘電体スタックおよび前記P型ドープ半導体層を垂直方向に貫通するチャネルホールをエッチングするステップであって、前記犠牲層で停止する、ステップと、
引き続いて、前記チャネルホールの側壁に沿ってメモリ膜および半導体チャネルを堆積するステップとを含む、請求項1~4のいずれか一項に記載の方法。 - 前記P型ドープ半導体層に当接する前記チャネル構造の前記一部を前記半導体プラグで置き換えるステップは、
前記P型ドープ半導体層に当接する前記メモリ膜の一部をエッチングして、前記半導体チャネルの一部を囲む陥凹部を形成するステップと、
前記半導体チャネルの前記一部をドープするステップと、
ポリシリコンを前記陥凹部内に堆積して、前記ドープ半導体チャネルの前記一部を囲み、それと接触する前記半導体プラグを形成するステップとを含む、請求項5に記載の方法。 - 前記P型ドープ半導体層に当接する前記チャネル構造の前記一部を前記半導体プラグで置き換えた後に、
前記P型ドープ半導体層と接触する第1のソースコンタクトを形成するステップと、
前記Nウェルと接触する第2のソースコンタクトを形成するステップとをさらに含む、請求項1~6のいずれか一項に記載の方法。 - それぞれ前記第1および第2のソースコンタクトと接触する第1の相互接続および第2の相互接続を含む相互接続層を形成するステップをさらに含む、請求項7に記載の方法。
- 前記P型ドープ半導体層を通り、前記第1の相互接続と接触する、第1のコンタクトを形成するステップであって、それにより前記P型ドープ半導体層は、前記第1のソースコンタクトおよび前記第1の相互接続を通して前記第1のコンタクトに電気的に接続される、ステップと、
前記P型ドープ半導体層を通り、前記第2の相互接続と接触する、第2のコンタクトを形成するステップであって、それにより前記Nウェルは、前記第2のソースコンタクトおよび前記第2の相互接続を通して前記第2のコンタクトに電気的に接続される、ステップとをさらに含む、請求項8に記載の方法。 - 前記誘電体スタックを形成する前に、N型ドーパントを、前記P型ドープ半導体層の一部にドープして、前記Nウェルを形成するステップをさらに含む、請求項1~9のいずれか一項に記載の方法。
- 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、
ハンドル層、埋め込み酸化物層、およびデバイス層を含むシリコンオンインシュレータ(SOI)ウェハの前記デバイス層に、P型ドーパントをドープするステップと、
N型ドーパントを前記ドープデバイス層の一部にドープして、前記ドープデバイス層内にNウェルを形成するステップと、
誘電体スタックを前記SOIウェハの前記ドープデバイス層上に形成するステップと、
前記誘電体スタックおよび前記ドープデバイス層を垂直方向に貫通するチャネル構造を形成するステップと、
前記誘電体スタックをメモリスタックで置き換えるステップであって、それにより、前記チャネル構造は、前記メモリスタックおよび前記ドープデバイス層を垂直方向に貫通する、ステップと、
前記ハンドル層および前記SOIウェハの前記埋め込み酸化物層を除去して前記チャネル構造の端部を露出するステップと、
前記ドープデバイス層に当接する前記チャネル構造の一部を半導体プラグで置き換えるステップとを含む、方法。 - 前記誘電体スタックは、交互配置されたスタック誘電体層とスタック犠牲層とを含み、
前記誘電体スタックを前記メモリスタックで置き換えるステップは、
前記誘電体スタックを垂直方向に貫通する開口部をエッチングするステップであって、前記ドープデバイス層で停止する、ステップと、
前記開口部を通して前記スタック犠牲層をスタック導電体層で置き換えて、交互配置された前記スタック誘電体層および前記スタック導電体層を含む前記メモリスタックを形成するステップとを含む、請求項11に記載の方法。 - 前記誘電体スタックを前記メモリスタックで置き換えた後に、1つまたは複数の誘電体材料を前記開口部内に堆積して、前記メモリスタックを垂直方向に貫通する絶縁構造を形成するステップをさらに含む、請求項12に記載の方法。
- 前記チャネル構造を形成するステップは、
前記誘電体スタックおよび前記ドープデバイス層を垂直方向に貫通するチャネルホールをエッチングするステップであって、前記埋め込み酸化物層で停止する、ステップと、
引き続いて、前記チャネルホールの側壁に沿ってメモリ膜および半導体チャネルを堆積するステップとを含む、請求項11~13のいずれか一項に記載の方法。 - 前記ドープデバイス層に当接する前記チャネル構造の前記一部を前記半導体プラグで置き換えるステップは、
前記ドープデバイス層に当接する前記メモリ膜の一部をエッチングして、前記半導体チャネルの一部を囲む陥凹部を形成するステップと、
前記半導体チャネルの前記一部をドープするステップと、
ポリシリコンを前記陥凹部内に堆積して、前記ドープ半導体チャネルの前記一部を囲み、それと接触する前記半導体プラグを形成するステップとを含む、請求項14に記載の方法。 - 前記ドープデバイス層に当接する前記チャネル構造の前記一部を前記半導体プラグで置き換えた後に、
前記ドープデバイス層と接触する第1のソースコンタクトを形成するステップと、
前記Nウェルと接触する第2のソースコンタクトを形成するステップとをさらに含む、請求項11~15のいずれか一項に記載の方法。 - それぞれ前記第1および第2のソースコンタクトと接触する第1の相互接続および第2の相互接続を含む相互接続層を形成するステップをさらに含む、請求項16に記載の方法。
- 前記ドープデバイス層を通り、前記第1の相互接続と接触する、第1のコンタクトを形成するステップであって、それにより前記ドープデバイス層は、前記第1のソースコンタクトおよび前記第1の相互接続を通して前記第1のコンタクトに電気的に接続される、ステップと、
前記ドープデバイス層を通り、前記第2の相互接続と接触する、第2のコンタクトを形成するステップであって、それにより前記Nウェルは、前記第2のソースコンタクトおよび前記第2の相互接続を通して前記第2のコンタクトに電気的に接続される、ステップとをさらに含む、請求項17に記載の方法。 - 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、
第1の基板上に周辺回路を形成するステップと、
メモリスタックとNウェルを有するP型ドープ半導体層とを垂直方向に貫通するチャネル構造を、第2の基板よりも上に形成するステップと、
前記第1の基板と前記第2の基板とを向かい合わせに接合し、それにより前記メモリスタックが前記周辺回路よりも上にあるようにする、ステップと、
前記第2の基板を除去して前記チャネル構造の上側端部を露出するステップと、
前記P型ドープ半導体層に当接する前記チャネル構造の一部を半導体プラグで置き換えるステップとを含む、方法。 - 前記チャネル構造を形成するステップは、
誘電体スタックを前記P型ドープ半導体層上に形成するステップと、
前記誘電体スタックおよび前記P型ドープ半導体層を垂直方向に貫通する前記チャネル構造を形成するステップと、
前記誘電体スタックを前記メモリスタックで置き換えるステップとを含む、請求項19に記載の方法。 - 前記チャネル構造を形成するステップは、
前記誘電体スタックを垂直方向に貫通するチャネルホールをエッチングするステップと、
引き続いて、前記チャネルホールの側壁に沿ってメモリ膜および半導体チャネルを堆積するステップとをさらに含む、請求項20に記載の方法。 - 前記P型ドープ半導体層に当接する前記チャネル構造の前記一部を前記半導体プラグで置き換えるステップは、
前記P型ドープ半導体層に当接する前記メモリ膜の一部をエッチングして、前記半導体チャネルの一部を囲む陥凹部を形成するステップと、
前記半導体チャネルの前記一部をドープするステップと、
ポリシリコンを前記陥凹部内に堆積して、前記ドープ半導体チャネルの前記一部を囲み、それと接触する前記半導体プラグを形成するステップとを含む、請求項21に記載の方法。 - 前記第1の基板と前記第2の基板とを接合する前に、前記メモリスタックを垂直方向に貫通する絶縁構造を形成するステップをさらに含む、請求項19~22のいずれか一項に記載の方法。
- 前記P型ドープ半導体層に当接する前記チャネル構造の前記一部を前記半導体プラグで置き換えた後に、
前記メモリスタックよりも上にあり、前記P型ドープ半導体層と接触している第1のソースコンタクトを形成するステップと、
前記メモリスタックよりも上にあり、前記Nウェルと接触している第2のソースコンタクトを形成するステップとをさらに含む、請求項19~23のいずれか一項に記載の方法。 - それぞれ前記第1および第2のソースコンタクトよりも上にあり、それらと接触する、第1の相互接続および第2の相互接続を含む相互接続層を形成するステップをさらに含む、請求項24に記載の方法。
- 前記ドープデバイス層を通り、前記第1の相互接続と接触する、第1のコンタクトを形成するステップであって、それにより前記ドープデバイス層は、前記第1のソースコンタクトおよび前記第1の相互接続を通して前記第1のコンタクトに電気的に接続される、ステップと、
前記ドープデバイス層を通り、前記第2の相互接続と接触する、第2のコンタクトを形成するステップであって、それにより前記Nウェルは、前記第2のソースコンタクトおよび前記第2の相互接続を通して前記第2のコンタクトに電気的に接続される、ステップとをさらに含む、請求項25に記載の方法。 - 前記誘電体スタックを形成する前に、N型ドーパントを、前記P型ドープ半導体層の一部にドープして、前記Nウェルを形成するステップをさらに含む、請求項19~26のいずれか一項に記載の方法。
- 接合する前記ステップは、ハイブリッド接合を含む、請求項19~27のいずれか一項に記載の方法。
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US11462560B2 (en) | 2022-10-04 |
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