JP7341253B2 - 3次元nandのためのキャパシタを形成するための構造および方法 - Google Patents
3次元nandのためのキャパシタを形成するための構造および方法 Download PDFInfo
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- JP7341253B2 JP7341253B2 JP2021571425A JP2021571425A JP7341253B2 JP 7341253 B2 JP7341253 B2 JP 7341253B2 JP 2021571425 A JP2021571425 A JP 2021571425A JP 2021571425 A JP2021571425 A JP 2021571425A JP 7341253 B2 JP7341253 B2 JP 7341253B2
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Description
101 メモリ平面
103 メモリブロック
105 周辺部領域
108 領域
210 階段領域
211 チャネル構造体領域
212 メモリストリング
214 接触構造体
216 スリット構造体
216-1 スリット構造体
216-2 スリット構造体
218 メモリフィンガー
220 上部選択ゲートカット
300 メモリアレイ構造体
330 基板
331 絶縁フィルム
332 下側選択ゲート(LSG)
333、333-1、333-2、333-3 制御ゲート
334 上部選択ゲート(TSG)
335 フィルムスタック
336 チャネルホール部
337 メモリフィルム
338 チャネル層
339 コア充填フィルム
340、340-1、340-2、340-3 メモリセル
341 ビットライン(BL)
343 金属相互接続ライン
344 ソースライン領域
400 周辺回路、CMOSウエハ
401 周辺領域
430 第1の基板
430-1 第1の側
430-2 第2の側
450 周辺デバイス
452 シャロートレンチアイソレーション(STI)
454 ウェル
455 ディープウェル
456 ゲートスタック
458 ゲートスペーサー
460 ソース/ドレイン
462 周辺相互接続層
464 接触構造体
466 導電性ライン
466-2 最上部の導電性ライン
468 絶縁層
470 金属レベル
470-1 底部金属レベル、導電性レベル
470-2 上側金属レベル、導電性レベル
472 基板接触部
473 ディープウェル接触部
486 相互接続VIA
500 3Dメモリアレイ
530 第2の基板
562 アレイ相互接続層
564 接触構造体
566 導電性ライン
568 絶縁層
572 基板接触部
574 導体層
576 第1の誘電体層
578 交互の導体/誘電体スタック
580 エピタキシャル層、エピタキシャルプラグ
582 半導体層
584 ビットライン接触部
586 相互接続VIA
600 3Dメモリデバイス
688 ボンディングインターフェース
690 ボンディング層
700 3Dメモリデバイス
800 3Dメモリデバイス
892 キャッピング層
900 3Dメモリデバイス
901 領域
903 キャパシタプリカーサー領域
994 トレンチ
994’ 開口部
994s 側壁部
995 スルーシリコントレンチ(TST)
1000 3Dメモリデバイス
1093 ディープトレンチアイソレーション(DTI)
1096 キャパシタ誘電体層
1100 3Dメモリデバイス
1101 領域
1195 3Dキャパシタ
1197 キャパシタ
1198 キャパシタ接触部
1200 3Dメモリデバイス
1201 領域
1299 第2のキャパシタ電極
1300 製作プロセス、方法
d1 幅
d2 幅
d3 幅
h 深さ
t1 厚さ
t2 厚さ
Claims (19)
- メモリデバイスのための3次元キャパシタを形成するための方法であって、
複数の周辺デバイス、第1の相互接続層、ディープウェル、および第1のキャパシタ電極を含む周辺回路を第1の基板の第1の側に形成するステップであって、前記第1のキャパシタ電極は、前記ディープウェルと電気的に接続される、ステップと、
複数のメモリセルおよび第2の相互接続層を含むメモリアレイを第2の基板の上に形成するステップと、
前記周辺回路の前記第1の相互接続層を前記メモリアレイの前記第2の相互接続層と結合するステップであって、前記周辺回路の少なくとも1つの周辺デバイスが、前記メモリアレイの少なくとも1つのメモリセルと電気的に接続されるようになっている、ステップと、
前記第1の基板の第2の側において、前記ディープウェルの内側に1つまたは複数のトレンチを形成するステップであって、前記第1および第2の側は、前記第1の基板の反対の側である、ステップと、
前記1つまたは複数のトレンチの側壁部の上にキャパシタ誘電体層を配設するステップと、
前記1つまたは複数のトレンチの内側の前記キャパシタ誘電体層の側壁部の上にキャパシタ接触部を形成するステップと
を含む、方法。 - 前記第1および第2の相互接続層を結合した後に、前記第2の側から前記第1の基板を薄くするステップをさらに含む、請求項1に記載の方法。
- 前記第1の基板を薄くするステップは、前記第1の基板の前記第2の側において前記ディープウェルを露出させるステップを含む、請求項2に記載の方法。
- 1つまたは複数のトレンチを形成する前に、前記第1の基板の前記第2の側にキャッピング層を配設するステップをさらに含む、請求項1に記載の方法。
- 前記3次元キャパシタのためのアクティブエリアを画定するためにディープトレンチアイソレーションを形成するステップをさらに含む、請求項1に記載の方法。
- 前記ディープトレンチアイソレーションを形成するステップは、
前記第1の基板を貫通するスルーシリコントレンチを形成し、前記第1の相互接続層の一部分を露出させるステップと、
前記スルーシリコントレンチの内側に絶縁材料を配設するステップと
を含む、請求項5に記載の方法。 - 前記ディープトレンチアイソレーションを形成するステップは、
前記1つまたは複数のトレンチを形成する前に、前記第1の基板を貫通するスルーシリコントレンチを形成し、前記第1の相互接続層の一部分を露出させるステップであって、前記スルーシリコントレンチの幅の半分は、前記キャパシタ誘電体層の厚さよりも小さい、ステップを含む、請求項5に記載の方法。 - キャパシタ接触部を形成するステップは、
前記1つまたは複数のトレンチの内側の前記キャパシタ誘電体層の前記側壁部の上に導電性材料を配設するステップと、
前記1つまたは複数のトレンチの外側の前記導電性材料を除去するステップと
を含む、請求項1に記載の方法。 - 前記1つまたは複数のトレンチの外側の前記導電性材料を除去するステップは、化学機械研磨を含む、請求項8に記載の方法。
- 前記第1の基板の前記第2の側において前記キャパシタ接触部の上に第2のキャパシタ電極を形成するステップをさらに含む、請求項1に記載の方法。
- 前記周辺回路の前記第1の相互接続層を前記メモリアレイの前記第2の相互接続層と結合する前記ステップは、ボンディングインターフェースにおける誘電体-誘電体ボンディングおよび金属-金属ボンディングを含む、請求項1に記載の方法。
- メモリデバイスのための3次元キャパシタであって、
第1の基板の第2の側に形成されたディープウェルであって、前記第2の側の反対側の前記第1の基板の第1の側は、複数の周辺デバイスおよび第1の相互接続層を含む、ディープウェルと、
前記ディープウェルと電気的に接続されている第1のキャパシタ電極と、
前記ディープウェルの内側の1つまたは複数のトレンチと、
前記1つまたは複数のトレンチの側壁部の上のキャパシタ誘電体層と、
前記1つまたは複数のトレンチの内側の前記キャパシタ誘電体層の側壁部の上のキャパシタ接触部と、
前記キャパシタ接触部の上に配設されている第2のキャパシタ電極と、
ディープトレンチアイソレーションと
を含み、
前記ディープトレンチアイソレーションは、前記第1の基板を貫通しており、前記3次元キャパシタのためのアクティブエリアを画定している、3次元キャパシタ。 - 前記第1の基板の前記第1の側にある前記第1の相互接続層は、第2の基板の上のメモリアレイの第2の相互接続層と結合されており、前記第1の基板の上の少なくとも1つの周辺デバイスが、前記メモリアレイの少なくとも1つのメモリセルと電気的に接続されるようになっている、請求項12に記載の3次元キャパシタ。
- 前記ディープトレンチアイソレーションは、酸化ケイ素、窒化ケイ素、または酸窒化ケイ素からなる絶縁材料によって充填されている、請求項12に記載の3次元キャパシタ。
- 前記キャパシタ誘電体層は、酸化ケイ素、窒化ケイ素または酸窒化ケイ素を含む、請求項12に記載の3次元キャパシタ。
- 前記キャパシタ誘電体層は、酸化ハフニウム、酸化ジルコニウム、酸化アルミニウム、酸化タンタル、酸化マグネシウム、酸化ランタン、または、それらの2つ以上の組み合わせを含む、高k誘電材料である、請求項12に記載の3次元キャパシタ。
- 前記1つまたは複数のトレンチは、前記ディープウェルを貫通し、前記第1の相互接続層の中へ延在している、請求項12に記載の3次元キャパシタ。
- 前記1つまたは複数のトレンチは、前記第1の基板の上の前記ディープウェルの一部分を貫通している、請求項12に記載の3次元キャパシタ。
- 前記1つまたは複数のトレンチの内側の前記キャパシタ誘電体層の前記側壁部の上の前記キャパシタ接触部は、タングステン、銅、アルミニウム、チタン、ニッケル、コバルト、窒化チタン、窒化タンタル、または、それらの2つ以上の組み合わせを含む、請求項12に記載の3次元キャパシタ。
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