JP2022529163A - 三次元メモリのためのコンタクト構造 - Google Patents
三次元メモリのためのコンタクト構造 Download PDFInfo
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- JP2022529163A JP2022529163A JP2021561769A JP2021561769A JP2022529163A JP 2022529163 A JP2022529163 A JP 2022529163A JP 2021561769 A JP2021561769 A JP 2021561769A JP 2021561769 A JP2021561769 A JP 2021561769A JP 2022529163 A JP2022529163 A JP 2022529163A
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- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/52—Arrangements for conducting electric current within the device in operation from one component to another, i.e. interconnections, e.g. wires, lead frames
- H01L23/535—Arrangements for conducting electric current within the device in operation from one component to another, i.e. interconnections, e.g. wires, lead frames including internal interconnections, e.g. cross-under constructions
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- H—ELECTRICITY
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- H10B—ELECTRONIC MEMORY DEVICES
- H10B43/00—EEPROM devices comprising charge-trapping gate insulators
- H10B43/50—EEPROM devices comprising charge-trapping gate insulators characterised by the boundary region between the core and peripheral circuit regions
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- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/768—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
- H01L21/76897—Formation of self-aligned vias or contact plugs, i.e. involving a lithographically uncritical step
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- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/3205—Deposition of non-insulating-, e.g. conductive- or resistive-, layers on insulating layers; After-treatment of these layers
- H01L21/321—After treatment
- H01L21/32115—Planarisation
- H01L21/3212—Planarisation by chemical mechanical polishing [CMP]
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- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/768—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
- H01L21/76838—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the conductors
- H01L21/7684—Smoothing; Planarisation
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- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/768—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
- H01L21/76838—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the conductors
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- H01L21/76843—Barrier, adhesion or liner layers formed in openings in a dielectric
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- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/768—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
- H01L21/76838—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the conductors
- H01L21/76895—Local interconnects; Local pads, as exemplified by patent document EP0896365
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- H01L23/52—Arrangements for conducting electric current within the device in operation from one component to another, i.e. interconnections, e.g. wires, lead frames
- H01L23/538—Arrangements for conducting electric current within the device in operation from one component to another, i.e. interconnections, e.g. wires, lead frames the interconnection structure between a plurality of semiconductor chips being formed on, or in, insulating substrates
- H01L23/5386—Geometry or layout of the interconnection structure
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- H10B—ELECTRONIC MEMORY DEVICES
- H10B41/00—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates
- H10B41/20—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates characterised by three-dimensional arrangements, e.g. with cells on different height levels
- H10B41/23—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates characterised by three-dimensional arrangements, e.g. with cells on different height levels with source and drain on different levels, e.g. with sloping channels
- H10B41/27—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates characterised by three-dimensional arrangements, e.g. with cells on different height levels with source and drain on different levels, e.g. with sloping channels the channels comprising vertical portions, e.g. U-shaped channels
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- H10B—ELECTRONIC MEMORY DEVICES
- H10B41/00—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates
- H10B41/30—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates characterised by the memory core region
- H10B41/35—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates characterised by the memory core region with a cell select transistor, e.g. NAND
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- H10B—ELECTRONIC MEMORY DEVICES
- H10B43/00—EEPROM devices comprising charge-trapping gate insulators
- H10B43/10—EEPROM devices comprising charge-trapping gate insulators characterised by the top-view layout
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- H—ELECTRICITY
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- H10B—ELECTRONIC MEMORY DEVICES
- H10B43/00—EEPROM devices comprising charge-trapping gate insulators
- H10B43/20—EEPROM devices comprising charge-trapping gate insulators characterised by three-dimensional arrangements, e.g. with cells on different height levels
- H10B43/23—EEPROM devices comprising charge-trapping gate insulators characterised by three-dimensional arrangements, e.g. with cells on different height levels with source and drain on different levels, e.g. with sloping channels
- H10B43/27—EEPROM devices comprising charge-trapping gate insulators characterised by three-dimensional arrangements, e.g. with cells on different height levels with source and drain on different levels, e.g. with sloping channels the channels comprising vertical portions, e.g. U-shaped channels
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B43/00—EEPROM devices comprising charge-trapping gate insulators
- H10B43/30—EEPROM devices comprising charge-trapping gate insulators characterised by the memory core region
- H10B43/35—EEPROM devices comprising charge-trapping gate insulators characterised by the memory core region with cell select transistors, e.g. NAND
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/768—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
- H01L21/76801—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the dielectrics, e.g. smoothing
- H01L21/76802—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the dielectrics, e.g. smoothing by forming openings in dielectrics
- H01L21/76805—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the dielectrics, e.g. smoothing by forming openings in dielectrics the opening being a via or contact hole penetrating the underlying conductor
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- H—ELECTRICITY
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- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/768—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
- H01L21/76801—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the dielectrics, e.g. smoothing
- H01L21/76802—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the dielectrics, e.g. smoothing by forming openings in dielectrics
- H01L21/76816—Aspects relating to the layout of the pattern or to the size of vias or trenches
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- H—ELECTRICITY
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- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/768—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
- H01L21/76801—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the dielectrics, e.g. smoothing
- H01L21/76829—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the dielectrics, e.g. smoothing characterised by the formation of thin functional dielectric layers, e.g. dielectric etch-stop, barrier, capping or liner layers
- H01L21/76831—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the dielectrics, e.g. smoothing characterised by the formation of thin functional dielectric layers, e.g. dielectric etch-stop, barrier, capping or liner layers in via holes or trenches, e.g. non-conductive sidewall liners
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Abstract
Description
101 メモリ平面
103 メモリブロック
105 周辺領域
108 領域
210 階段領域
211 チャネル構造領域
212 メモリストリング
214 コンタクト構造
216、216-1、216-2 スリット構造
218 メモリ指部
220 上選択ゲート切断部
222 ダミーメモリストリング
224 メモリスライス
300 三次元(3D)メモリアレイ構造
330 基板
330f 前面、主面、上面
331 絶縁膜
332 下方選択ゲート
333、333-1、333-2、333-3 制御ゲート、ワード線
334 上選択ゲート
335 膜スタック
336 チャネルホール
337 メモリ膜
338 チャネル層
339 コア充填膜
340、340-1、340-2、340-3 メモリセル
341 ビット線
343 金属相互連結線
344 ドープソース線領域
500、600、700、900、1000、1100、1200、1300、1400、1500、1600、1700、1800、1900、2000、2300、2400、2500、2600、2700、2800、2900 3Dメモリ構造
554 誘電性スタック
556 誘電層対
558 第1の誘電層
560 第2の誘電層、犠牲層
662 ハードマスク
764 コンタクト定義マスク
866 ハードマスク開口
866-t 第1の誘電層対の上面
968 第1のコンタクトマスク
1070 コンタクト開口の第1のサブセット
1070-t 第2の誘電層対の上面
1172 第2のコンタクトマスク
1274 コンタクト開口の第2のサブセット
1274-t 第4の誘電層対の上面
1275 コンタクト開口の第3のサブセット
1275-t 第3の誘電層対の上面
1376 第3のコンタクトマスク
1478 コンタクト開口の第4のサブセット
1478-t 第8の誘電層対の上面
1479 コンタクト開口の第5のサブセット
1479-t 第6の誘電層対の上面
1480 コンタクト開口の第6のサブセット
1480-t 第5の誘電層対の上面
1481 コンタクト開口の第7のサブセット
1481-t 第7の誘電層対の上面
1584 コンタクト充填部
1586 充填材料
1587 ライナ
1688 キャッピング層
1690 エピタキシャル層
1792 スリット開口
1894 導電層
1996 コンタクトホール
1997 分離ライナ
2098 共通ソースコンタクト
BL ビット線の方向
WL ワード線の方向
Claims (28)
- 三次元(3D)メモリ構造を形成するための方法であって、
基板に交互の誘電性スタックを配置するステップであって、前記交互の誘電性スタックは、互いの上に交互に積み重ねられる第1および第2の誘電層を備える、ステップと、
誘電層対が複数のコンタクト開口のうちの少なくとも1つの内側で露出させられるように、前記交互の誘電性スタックに前記複数のコンタクト開口を形成するステップであって、前記誘電層対は前記第1および第2の誘電層の1つの対を備え、前記複数のコンタクト開口の前記形成は、
N個の誘電層対をエッチングすることで、前記交互の誘電性スタックに複数の開口を形成するステップであって、Nは整数である、ステップ、
前記複数の開口の第1のグループを保護し、前記複数の開口の第2のグループを露出させるためにマスクを形成するステップであって、前記複数の開口の前記第1のグループは、前記N個の誘電層対を通じて延びる開口の第1のサブセットである、ステップ、
M個の誘電層対をエッチングすることで、前記複数の開口の前記第2のグループに開口の第2のサブセットを形成するステップであって、開口の前記第2のサブセットは(N+M)個の誘電層対を通じて延び、Mは整数である、ステップ、および、
マスクの前記形成、および、開口の前記サブセットの各々のための前記エッチングを繰り返すステップ
を含む、ステップと、
前記第2の誘電層を導電層で置き換えることで、交互の導電層および誘電層の膜スタックを形成するステップと、
交互の導電層および誘電層の前記膜スタックにおいて前記導電層と接触するためにコンタクト構造を形成するステップと
を含む方法。 - 開口の前記第1および第2のサブセットは同じ数の開口を備える、請求項1に記載の方法。
- 前記M個の誘電層対は前記N個の誘電層対の2倍の多さである、請求項1に記載の方法。
- 交互の導電層および誘電層の前記膜スタックの前記形成は、前記交互の誘電性スタックにスリット開口を形成するステップを含む、請求項1に記載の方法。
- 前記スリット開口に、前記基板と電気的に連結される共通ソースコンタクトを形成するステップをさらに含む、請求項4に記載の方法。
- 前記複数のコンタクト開口の内側に充填材料を配置するステップをさらに含む、請求項1に記載の方法。
- 前記複数のコンタクト開口の前記形成の前に、前記交互の誘電性スタックに複数のメモリストリング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。
- 前記複数のメモリストリングの形成は、
前記交互の誘電性スタックを鉛直に貫通するチャネルホールを形成するステップと、
チャネルホールの側壁にメモリ膜、チャネル層、およびコア充填膜を配置するステップと
を含む、請求項7に記載の方法。 - 前記複数のコンタクト開口の前記形成の後に、前記交互の誘電性スタックに複数のメモリストリング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。
- 前記複数のメモリストリングの形成は、
前記交互の誘電性スタックを鉛直に貫通するチャネルホールを形成するステップと、
チャネルホールの側壁にメモリ膜、チャネル層、およびコア充填膜を配置するステップと
を含む、請求項9に記載の方法。 - 前記コンタクト構造を形成するステップは、
前記複数のコンタクト開口の側壁にライナを形成するステップと、
交互の導電層および誘電層の前記膜スタックにおいて前記導電層を露出させるために前記複数のコンタクト開口の各々の内側にコンタクトホールを形成するステップと、
前記導電層との電気的接触を形成するために、前記コンタクトホールの内側に導電性材料を配置するステップと
を含む、請求項1に記載の方法。 - 化学機械研磨によって同一平面の表面を形成するステップをさらに含む、請求項11に記載の方法。
- 三次元(3D)メモリ構造であって、
基板に配置される膜スタックであって、互いの上に交互に積み重ねられる導電層および誘電層を備える膜スタックと、
前記膜スタックを鉛直に貫通する複数のメモリストリングであって、メモリ膜、チャネル層、およびコア充填膜を各々が備える複数のメモリストリングと、
前記膜スタックの内側に配置される複数のコンタクト構造であって、
前記膜スタックの各々の導電層が前記複数のコンタクト構造のうちの少なくとも1つに電気的に連結されるように、前記導電層および誘電層の1つまたは複数を鉛直に貫通し、
前記複数のメモリストリングによって包囲される
複数のコンタクト構造と
を備える三次元(3D)メモリ構造。 - 前記複数のコンタクト構造の各々は、導電性材料を包囲するライナを備える、請求項13に記載の3Dメモリ構造。
- 前記ライナは、前記複数のコンタクト構造を前記膜スタックの1つまたは複数の導電層から電気的に分離するように構成される絶縁体を備える、請求項14に記載の3Dメモリ構造。
- 前記膜スタックを鉛直に貫通し、前記基板に電気的に連結される共通ソースコンタクトをさらに備える、請求項13に記載の3Dメモリ構造。
- 前記共通ソースコンタクトは、前記共通ソースコンタクトを前記膜スタックの前記導電層から電気的に分離するように構成される分離ライナを備える、請求項16に記載の3Dメモリ構造。
- 前記複数のコンタクト構造に隣接して前記膜スタックを鉛直に貫通し、前記コア充填膜を各々が備える複数のダミーメモリストリングをさらに備える、請求項13に記載の3Dメモリ構造。
- 前記複数のコンタクト構造は前記膜スタックと同一平面にある、請求項13に記載の3Dメモリ構造。
- 前記複数のコンタクト構造はメモリアレイにおいてランダムに分配される、請求項13に記載の3Dメモリ構造。
- 三次元(3D)メモリ構造を形成するための方法であって、
交互の誘電性スタックを基板に配置するステップであって、前記交互の誘電性スタックは2n個の誘電層対を備え、nは整数であり、各々の誘電層対は、第1の誘電層と、前記第1の誘電層と異なる第2の誘電層とを備える、ステップと、
(n+1)回の繰り返しパターン形成プロセスを用いて複数のコンタクト開口を形成するステップであって、i番目のパターン形成プロセスが、
上の2i個の誘電層対が前記複数のコンタクト開口の内側に露出させられるように2(i-1)個の誘電層対をエッチングすることであって、iは1からnまでの範囲にある整数である、エッチングすることを含む、ステップと、
前記第2の誘電層を導電層で置き換えることで、交互の導電層および誘電層の膜スタックを形成するステップと、
交互の導電層および誘電層の前記膜スタックにおいて前記導電層に電気的に連結されるコンタクト構造を形成するステップと
を含む方法。 - 前記i番目のパターン形成プロセスは、前記エッチングの前に、前記複数のコンタクト開口のサブセットを露出させるためにマスクを形成することをさらに含み、上の2(i-1)個の誘電層対は前記複数のコンタクト開口の前記サブセットの内側に露出させられる、請求項21に記載の方法。
- 前記複数のコンタクト開口の形成の前に、前記交互の誘電性スタックにハードマスクを配置するステップと、
前記ハードマスクに複数の開口を形成するステップと
をさらに含む、請求項21に記載の方法。 - 前記複数のコンタクト開口の前記形成の前に、前記交互の誘電性スタックに複数のメモリストリングを形成するステップをさらに含む、請求項21に記載の方法。
- 前記複数のコンタクト開口の前記形成の後に、前記交互の誘電性スタックに複数のメモリストリングを形成するステップをさらに含む、請求項21に記載の方法。
- 前記コンタクト構造を形成するステップは、
前記複数のコンタクト開口の側壁にライナを形成するステップと、
交互の導電層および誘電層の前記膜スタックにおいて前記導電層を露出させるために前記複数のコンタクト開口の各々の内側にコンタクトホールを形成するステップと、
前記導電層との電気的接触を形成するために、前記コンタクトホールの内側に導電性材料を配置するステップと
を含む、請求項21に記載の方法。 - 交互の導電層および誘電層の前記膜スタックの形成は、前記交互の誘電性スタックにスリット開口を形成するステップを含む、請求項21に記載の方法。
- 前記複数のコンタクト開口の内側に充填材料を配置するステップをさらに含む、請求項21に記載の方法。
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US20220139837A1 (en) | 2022-05-05 |
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