JP2023515450A - バックサイド相互接続構造を備える3次元メモリデバイス - Google Patents
バックサイド相互接続構造を備える3次元メモリデバイス Download PDFInfo
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- 239000003989 dielectric material Substances 0.000 description 14
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- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 8
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- 229910052732 germanium Inorganic materials 0.000 description 2
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 description 2
- 229910021421 monocrystalline silicon Inorganic materials 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 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
- LEVVHYCKPQWKOP-UHFFFAOYSA-N [Si].[Ge] Chemical compound [Si].[Ge] LEVVHYCKPQWKOP-UHFFFAOYSA-N 0.000 description 1
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- 229910021417 amorphous silicon Inorganic materials 0.000 description 1
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- 239000010941 cobalt Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
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Abstract
Description
本出願は、すべて全体が参照により本明細書に組み込まれている、2020年4月14日に出願した国際出願第PCT/CN2020/084600号、名称「THREE-DIMENSIONAL MEMORY DEVICE WITH BACKSIDE SOURCE CONTACT」、および2020年4月14日に出願した国際出願第PCT/CN2020/084603号、名称「METHOD FOR FORMING THREE-DIMENSIONAL MEMORY DEVICE WITH BACKSIDE SOURCE CONTACT」の優先権の利益を主張する。
102 ブロック
104 階段領域
106A、106B コアアレイ領域
108 絶縁構造
110 チャネル構造
200 3Dメモリデバイス
201 3Dメモリデバイス
202 ブロック
203 3Dメモリデバイス
204 階段領域
206A、206B コアアレイ領域
208 周辺領域
210 ソース線メッシュ
212 平行歯ソース線
214 シャフトソース線
216 バックサイドソースコンタクト
218、226、230 コンタクト
220 電力線メッシュ
222 歯電力線
224 シャフト電力線
228 SSG線
230 コンタクト
300 3Dメモリデバイス
301 基板
302 第1の半導体構造
304 第2の半導体構造
306 接合界面
308 周辺回路
310 接合層
311 接合コンタクト
312 接合層
313 接合コンタクト
314 メモリスタック
316 一番上の導電体層
318 誘電体層
320、322 半導体層
324 チャネル構造
326 メモリ膜
328 半導体チャネル
329 チャネルプラグ
330 絶縁構造
332 ソースコンタクト、バックサイドソースコンタクト
333 バックサイド相互接続層
334 ILD層
336 再配線層
338 パッシベーション層
340 ボンディングパッド
342、344 コンタクト
346、348 周辺コンタクト
350 チャネルローカルコンタクト
352 ワード線ローカルコンタクト
400 3Dメモリデバイス
402 ブロック
404 階段領域
406A、406B コアアレイ領域
408 チャネル構造
410 ソース線メッシュ
412 平行ソース線
414 平行ソース線
416 バックサイドソースコンタクト
418 コンタクト
500 3Dメモリデバイス
502 ソースコンタクト
602 第1のシリコン基板
604 周辺回路
606 第2のシリコン基板
608 チャネル構造
609 接合界面
610 半導体層
612 バックサイドソースコンタクト
614、616、618 TSC
620 ソース線メッシュ
622 電力線メッシュ
624 SSG線
700 方法
Claims (28)
- 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、
各々が垂直方向に前記メモリスタックを貫通する複数のチャネル構造と、
前記複数のチャネル構造より上にあり、前記複数のチャネル構造と接触している半導体層と、
前記メモリスタックより上にあり、前記半導体層と接触している複数のソースコンタクトと、
前記半導体層を通る複数のコンタクトと、
平面図内でソース線メッシュを含む前記半導体層より上にあるバックサイド相互接続層であって、前記複数のソースコンタクトは、前記ソース線メッシュより下に、前記ソース線メッシュと接触するように分配され、前記複数のコンタクトの第1のセットは、前記ソース線メッシュより下に、前記ソース線メッシュと接触するように分配されている、バックサイド相互接続層とを備える、3Dメモリデバイス。 - 前記メモリスタックは、前記チャネル構造を有する2つのコアアレイ領域と、前記平面図内の第1の横方向の前記2つのコアアレイ領域の間の階段領域とを備える、請求項1に記載の3Dメモリデバイス。
- 前記バックサイド相互接続層は、前記平面図内で複数のソースセレクトゲート(SSG)線をさらに備え、前記複数のコンタクトの第2のセットは、前記SSG線より下に、前記SSG線と接触するように分配される、請求項2に記載の3Dメモリデバイス。
- 前記SSG線の各々は、前記2つのコアアレイ領域および前記階段領域をまたがって前記第1の横方向に延在し、前記コンタクトの前記第2のセットは、前記平面図内で前記コアアレイ領域内に分配される、請求項3に記載の3Dメモリデバイス。
- コンタクトの前記第2のセットの各々は、前記メモリスタック内にさらに貫入して前記メモリスタックの前記導電体層のうちの1つと接触する、請求項3または4に記載の3Dメモリデバイス。
- 前記SSG線は、前記平面図内で、前記第1の横方向に垂直な第2の横方向に平行に均等に分配される、請求項3から5の何れか一項に記載の3Dメモリデバイス。
- 前記バックサイド相互接続層は、前記平面図内で電力線メッシュをさらに備え、前記複数のコンタクトの第3のセットは、前記電力線メッシュより下に、前記電力線メッシュと接触するように分配される、請求項2から6の何れか一項に記載の3Dメモリデバイス。
- 前記コンタクトの前記第3のセットは、前記平面図内で、前記階段領域、またはメモリアレイの外側の周辺領域のうちの少なくとも一方に分配される、請求項7に記載の3Dメモリデバイス。
- 前記電力線メッシュは、櫛状の形状を有する、請求項7または8に記載の3Dメモリデバイス。
- 前記バックサイド相互接続層は、前記コンタクトの前記第3のセットを通して前記電力線メッシュに電気的に接続されているボンディングパッドをさらに備える、請求項7から9の何れか一項に記載の3Dメモリデバイス。
- 前記ソース線メッシュは、櫛状の形状を有する、請求項1から10の何れか一項に記載の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、
各々が垂直方向に前記メモリスタックを貫通する複数のチャネル構造と、
前記複数のチャネル構造より上にあり、前記複数のチャネル構造と接触している半導体層と、
前記半導体層と接触している複数のソースコンタクトであって、前記チャネル構造の各々は、前記ソースコンタクトのうちのそれぞれのソースコンタクトより下にあり、それぞれのソースコンタクトと横方向に整列されている、複数のソースコンタクトと、
平面図内でソース線メッシュを含む前記半導体層より上にあるバックサイド相互接続層であって、前記ソース線メッシュは、前記ソースコンタクトの各々より上にあり、前記ソースコンタクトの各々と接触している、バックサイド相互接続層とを備える、3Dメモリデバイス。 - 前記半導体層を通って、前記ソース線メッシュより下に、前記ソース線メッシュと接触するように分配されている複数のコンタクトをさらに備える、請求項12に記載の3Dメモリデバイス。
- 前記メモリスタックは、前記チャネル構造を有する1つまたは複数のコアアレイ領域を備え、前記コンタクトは、前記平面図内で前記コアアレイ領域の外側に分配される、請求項13に記載の3Dメモリデバイス。
- 前記ソース線メッシュは、各々が前記平面図内で横方向に延在する複数の平行ソース線を含む、請求項12から14の何れか一項に記載の3Dメモリデバイス。
- 前記ソースコンタクトは、アレイに配置構成され、前記ソース線の各々は、前記平面図内の前記アレイの行または列内の前記ソースコンタクトの各々と接触する、請求項15に記載の3Dメモリデバイス。
- 前記ソース線の各々は、前記平面図内の前記アレイの2つの隣接する行または列内の前記ソースコンタクトの各々と接触する、請求項16に記載の3Dメモリデバイス。
- 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、
各々が第2の基板のフロントサイド上のメモリスタックを垂直方向に貫通する複数のチャネル構造を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、それにより前記チャネル構造は前記周辺回路よりも上にある、ステップと、
前記第2の基板を薄化するステップと、
前記薄化された第2の基板を通る複数のコンタクトおよび前記薄化された第2の基板と接触する複数のソースコンタクトを形成するステップと、
ソース線メッシュを、前記薄化された第2の基板のバックサイド上に形成し、それにより前記ソース線メッシュは、前記複数のソースコンタクト、および前記複数のコンタクトの第1のセットより上にあり、それらと接触する、ステップとを含む、方法。 - 前記メモリスタックは、前記チャネル構造を有する2つのコアアレイ領域と、平面図内の第1の横方向の前記2つのコアアレイ領域の間の階段領域とを備える、請求項18に記載の方法。
- 複数のソースセレクトゲート(SSG)線を、前記薄化された第2の基板の前記バックサイド上に形成し、それにより前記SSG線は、前記複数のコンタクトの第2のセットより上にあり、それらと接触する、ステップをさらに含む、請求項19に記載の方法。
- 前記SSG線の各々は、前記2つのコアアレイ領域および前記階段領域をまたがって前記第1の横方向に延在し、前記コンタクトの前記第2のセットは、前記平面図内で前記コアアレイ領域内に分配される、請求項20に記載の方法。
- 前記SSG線は、前記平面図内で、前記第1の横方向に垂直な第2の横方向に平行に均等に分配される、請求項20または21の何れか一項に記載の方法。
- 電力線メッシュを、前記薄化された第2の基板の前記バックサイド上に形成し、それにより前記電力線メッシュは、前記複数のコンタクトの第3のセットより上にあり、それらと接触する、ステップをさらに含む、請求項19に記載の方法。
- 前記コンタクトの前記第3のセットは、前記平面図内で、前記階段領域、またはメモリアレイの外側の周辺領域のうちの少なくとも一方に分配される、請求項23に記載の方法。
- 前記ソース線メッシュは、各々が平面図内で横方向に延在する複数の平行ソース線を含む、請求項18に記載の方法。
- 前記チャネル構造の各々は、前記ソースコンタクトのうちのそれぞれのソースコンタクトより下にあり、それぞれのソースコンタクトと横方向に整列され、前記ソース線メッシュは、前記ソースコンタクトの各々より上にあり、前記ソースコンタクトの各々と接触している、請求項25に記載の方法。
- 前記ソースコンタクトは、アレイに配置構成され、前記ソース線の各々は、前記平面図内の前記アレイの行または列内の前記ソースコンタクトの各々と接触する、請求項26に記載の方法。
- 前記ソース線の各々は、前記平面図内の前記アレイの2つの隣接する行または列内の前記ソースコンタクトの各々と接触する、請求項27に記載の方法。
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