JP2022533896A - バックサイドソースコンタクトを備える3次元メモリデバイス - Google Patents
バックサイドソースコンタクトを備える3次元メモリデバイス Download PDFInfo
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- JP2022533896A JP2022533896A JP2021559602A JP2021559602A JP2022533896A JP 2022533896 A JP2022533896 A JP 2022533896A JP 2021559602 A JP2021559602 A JP 2021559602A JP 2021559602 A JP2021559602 A JP 2021559602A JP 2022533896 A JP2022533896 A JP 2022533896A
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- semiconductor layer
- memory device
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- 230000015654 memory Effects 0.000 claims abstract description 138
- 239000000758 substrate Substances 0.000 claims abstract description 76
- 230000002093 peripheral effect Effects 0.000 claims abstract description 71
- 239000003989 dielectric material Substances 0.000 claims description 29
- 229910021420 polycrystalline silicon Inorganic materials 0.000 claims description 26
- 229920005591 polysilicon Polymers 0.000 claims description 26
- 238000002955 isolation Methods 0.000 claims description 15
- 229910021421 monocrystalline silicon Inorganic materials 0.000 claims description 13
- 230000000149 penetrating effect Effects 0.000 claims description 8
- 238000000034 method Methods 0.000 abstract description 99
- 239000010410 layer Substances 0.000 description 499
- 229910052710 silicon Inorganic materials 0.000 description 41
- 239000010703 silicon Substances 0.000 description 41
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- 238000004519 manufacturing process Methods 0.000 description 27
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- 229910052814 silicon oxide Inorganic materials 0.000 description 24
- 238000000231 atomic layer deposition Methods 0.000 description 23
- 238000005229 chemical vapour deposition Methods 0.000 description 23
- 238000005240 physical vapour deposition Methods 0.000 description 23
- 239000010408 film Substances 0.000 description 18
- 229910052581 Si3N4 Inorganic materials 0.000 description 16
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- 238000001312 dry etching Methods 0.000 description 13
- 238000005530 etching Methods 0.000 description 13
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- 239000010949 copper Substances 0.000 description 11
- 238000000151 deposition Methods 0.000 description 11
- 229910052802 copper Inorganic materials 0.000 description 10
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- 229910021332 silicide Inorganic materials 0.000 description 10
- 125000006850 spacer group Chemical group 0.000 description 10
- 229910052721 tungsten Inorganic materials 0.000 description 10
- 238000002161 passivation Methods 0.000 description 9
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- 229910052751 metal Inorganic materials 0.000 description 7
- 239000002184 metal Substances 0.000 description 7
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 description 6
- 229910052782 aluminium Inorganic materials 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 6
- 230000000903 blocking effect Effects 0.000 description 6
- 239000002019 doping agent Substances 0.000 description 6
- 238000003860 storage Methods 0.000 description 6
- 238000011049 filling Methods 0.000 description 5
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- WGTYBPLFGIVFAS-UHFFFAOYSA-M tetramethylammonium hydroxide Chemical compound [OH-].C[N+](C)(C)C WGTYBPLFGIVFAS-UHFFFAOYSA-M 0.000 description 4
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- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
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- 238000005137 deposition process Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 229910052732 germanium Inorganic materials 0.000 description 2
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 description 2
- 238000005468 ion implantation Methods 0.000 description 2
- 238000004943 liquid phase epitaxy Methods 0.000 description 2
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- 229910001218 Gallium arsenide Inorganic materials 0.000 description 1
- GPXJNWSHGFTCBW-UHFFFAOYSA-N Indium phosphide Chemical compound [In]#P GPXJNWSHGFTCBW-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
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- 238000002513 implantation Methods 0.000 description 1
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- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
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- Physics & Mathematics (AREA)
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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 第1の半導体層
122 第2の半導体層
124 チャネル構造
126 メモリ膜
128 半導体チャネル
129 チャネルプラグ
130 絶縁構造
132 ソースコンタクト、バックサイドソースコンタクト
133 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
202 ブロック
204 階段領域
206 コアアレイ領域
206A 第1のコアアレイ領域
206B 第2のコアアレイ領域
208 絶縁構造
209 バックサイドソース線
210 チャネル構造
211 Nウェルピックアップコンタクト
212 ドレインセレクトゲートカット
213 パッドアウトコンタクト
214 領域
215 ソースコンタクト
302 シリコン基板
304 N型ドープ半導体層
305 パッド酸化物層
306 犠牲層
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
316 メモリ膜
318 半導体チャネル
320 スリット
322 キャビティ
324 スペーサ
326 N型ドープ半導体層
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
358 ソースコンタクト開口部
360、361 コンタクト開口部
362 スペーサ
364 ソースコンタクト、バックサイドソースコンタクト
366、368 コンタクト
370 再配線層
372 パッシベーション層
374 コンタクトパッド
376 相互接続層
400 方法
Claims (35)
- 3次元(3D)メモリデバイスであって、
基板と、
前記基板上の周辺回路と、
前記周辺回路よりも上にある交互配置された導電体層および誘電体層を含むメモリスタックと、
前記メモリスタックよりも上にある第1の半導体層と、
前記第1の半導体層よりも上にあり、前記第1の半導体層と接触している第2の半導体層と、
各々が垂直方向に前記メモリスタックおよび前記第1の半導体層を貫通する複数のチャネル構造と、
前記メモリスタックよりも上にあり、前記第2の半導体層と接触しているソースコンタクトとを含む、3次元(3D)メモリデバイス。 - 前記第1の半導体層および前記第2の半導体層の各々は、Nウェルを含む、請求項1に記載の3Dメモリデバイス。
- 前記第2の半導体層は、単結晶シリコンを含む、請求項1または2に記載の3Dメモリデバイス。
- 前記第1の半導体層は、ポリシリコンを含む、請求項1から3のいずれか一項に記載の3Dメモリデバイス。
- 前記ソースコンタクトよりも上にあり、それに電気的に接続されている相互接続層をさらに含む、請求項1から4のいずれか一項に記載の3Dメモリデバイス。
- 前記第2の半導体層を通る第1のコンタクトをさらに含み、前記第1の半導体層は、少なくとも前記第2の半導体層、前記ソースコンタクト、前記相互接続層、および前記第1のコンタクトを通して前記周辺回路に電気的に接続される、請求項5に記載の3Dメモリデバイス。
- 垂直方向に前記メモリスタックを貫通し、前記複数のチャネル構造を複数のブロックに分離するために横方向に延在する絶縁構造をさらに含む、請求項1から6のいずれか一項に記載の3Dメモリデバイス。
- 前記絶縁構造は、1つまたは複数の誘電体材料を充填される、請求項7に記載の3Dメモリデバイス。
- 前記絶縁構造の頂面は、前記第1の半導体層の底面と同一平面上にある、請求項7または8に記載の3Dメモリデバイス。
- 前記ソースコンタクトは、前記絶縁構造に整列される、請求項7から9のいずれか一項に記載の3Dメモリデバイス。
- 前記チャネル構造の各々は、前記第2の半導体層内に垂直方向に貫入する、請求項1から10のいずれか一項に記載の3Dメモリデバイス。
- 前記第2の半導体層の横方向寸法は、前記第1の半導体層の横方向寸法よりも大きい、請求項1から11のいずれか一項に記載の3Dメモリデバイス。
- 前記周辺回路と前記メモリスタックとの間の接合界面をさらに含む、請求項1から12のいずれか一項に記載の3Dメモリデバイス。
- 前記第2の半導体層を通る第2のコンタクトをさらに含み、前記相互接続層は、前記第2のコンタクトに電気的に接続されているコンタクトパッドを含む、請求項1から13のいずれか一項に記載の3Dメモリデバイス。
- 3次元(3D)メモリデバイスであって、
基板と、
前記基板よりも上にある交互配置された導電体層および誘電体層を含むメモリスタックと、
前記メモリスタックよりも上にあるN型ドープ半導体層と、
各々が垂直方向に前記メモリスタックを通って前記N型ドープ半導体層内に貫入する複数のチャネル構造と、
前記メモリスタックよりも上にあり、前記N型ドープ半導体層と接触しているソースコンタクトとを含む、3次元(3D)メモリデバイス。 - 垂直方向に前記メモリスタックを貫通し、前記複数のチャネル構造を複数のブロックに分離するために横方向に延在する絶縁構造をさらに含む、請求項15に記載の3Dメモリデバイス。
- 前記絶縁構造は、1つまたは複数の誘電体材料を充填される、請求項16に記載の3Dメモリデバイス。
- 前記絶縁構造の頂面は、前記N型ドープ半導体層の底面と同一平面上にある、請求項16または17に記載の3Dメモリデバイス。
- 前記ソースコンタクトは、前記絶縁構造に整列される、請求項16から18のいずれか一項に記載の3Dメモリデバイス。
- 前記N型ドープ半導体層は、ポリシリコンを含む第1のN型ドープ半導体層と単結晶シリコンを含む第2のN型ドープ半導体層とを含む、請求項15から19のいずれか一項に記載の3Dメモリデバイス。
- 前記チャネル構造の各々は、前記第1のN型ドープ半導体層を垂直方向に貫通する、請求項20に記載の3Dメモリデバイス。
- 前記ソースコンタクトは、前記第1のN型ドープ半導体層よりも上にあり、前記第2のN型ドープ半導体層と接触している、請求項20または21に記載の3Dメモリデバイス。
- 前記第2のN型ドープ半導体層の横方向寸法は、前記第1のN型ドープ半導体層の横方向寸法よりも大きい、請求項20から22のいずれか一項に記載の3Dメモリデバイス。
- 前記基板上の周辺回路と、
前記周辺回路と前記メモリスタックとの間の接合界面とをさらに含む、請求項15から23のいずれか一項に記載の3Dメモリデバイス。 - 前記ソースコンタクトよりも上にあり、それに電気的に接続されている相互接続層をさらに含む、請求項24に記載の3Dメモリデバイス。
- 前記N型ドープ半導体層は、少なくとも前記ソースコンタクトおよび前記相互接続層を通して前記周辺回路に電気的に接続される、請求項25に記載の3Dメモリデバイス。
- 3次元(3D)メモリデバイスであって、
周辺回路を含む第1の半導体構造と、
第2の半導体構造であって、
交互配置された導電体層および誘電体層を含むメモリスタックと、
N型ドープ半導体層と、
各々が垂直方向に前記メモリスタックを通って前記N型ドープ半導体層内に貫入し、前記周辺回路に電気的に接続されている複数のチャネル構造と、
垂直方向に前記メモリスタックを貫通し、前記複数のチャネル構造を複数のブロックに分離するために横方向に延在する絶縁構造とを備える第2の半導体構造と、
前記第1の半導体構造と前記第2の半導体構造との間の接合界面とを含む、3次元(3D)メモリデバイス。 - 前記第2の半導体構造は、前記N型ドープ半導体層と接触しており前記絶縁構造に整列されているソースコンタクトをさらに含む、請求項27に記載の3Dメモリデバイス。
- 前記第2の半導体構造は、相互接続層をさらに含み、
前記N型ドープ半導体層は、少なくとも前記ソースコンタクトおよび前記相互接続層を通して前記周辺回路に電気的に接続される、請求項28に記載の3Dメモリデバイス。 - 前記絶縁構造は、1つまたは複数の誘電体材料を充填される、請求項27から29のいずれか一項に記載の3Dメモリデバイス。
- 前記絶縁構造は、前記N型ドープ半導体層内に垂直に貫入しない、請求項27から30のいずれか一項に記載の3Dメモリデバイス。
- 前記N型ドープ半導体層は、ポリシリコンを含む第1のN型ドープ半導体層と単結晶シリコンを含む第2のN型ドープ半導体層とを含む、請求項27から31のいずれか一項に記載の3Dメモリデバイス。
- 前記チャネル構造の各々は、前記第1のN型ドープ半導体層を垂直方向に貫通する、請求項32に記載の3Dメモリデバイス。
- 前記ソースコンタクトは、前記第2のN型ドープ半導体層と接触する、請求項32または33に記載の3Dメモリデバイス。
- 前記第2のN型ドープ半導体層の横方向寸法は、前記第1のN型ドープ半導体層の横方向寸法よりも大きい、請求項32から34のいずれか一項に記載の3Dメモリデバイス。
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