JP2014140054A - 互いに隣接する実質的に垂直な半導体構造を有するメモリアレイ、およびそれらの形成 - Google Patents
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Abstract
【解決手段】1つのそのようなメモリアレイは、分離した実質的に垂直な隣接する半導体構造455に隣接して形成される、メモリセルストリングを有し、分離した半導体構造は、それぞれのストリングのメモリセル472を直列に連結する。いくつかの実施形態については、2本の誘電体柱445が、単一の開口部の中に形成される誘電体から形成されてもよく、誘電体柱のうちのそれぞれは、それに隣接する一対のメモリセルストリングを有し、柱のうちの1本の上のストリングのうちの1つの少なくとも1つのメモリセル、および他方の柱の上のストリングのうちの1つの少なくとも1つのメモリセルは、共通してアクセス線480に連結される。
【選択図】図5E
Description
本発明のメモリアレイは、実質的に垂直な第1及び第2の半導体構造と、直列に結合された第1のメモリセルのストリングであって、前記第1のメモリセルの各々が、前記第1の半導体構造に隣接する第1の電荷蓄積構造のそれぞれの一部分と、前記第1の電荷蓄積構造の前記それぞれの一部分に隣接する第1の制御ゲートとを含む、第1のメモリセルのストリングと、直列に結合された第2のメモリセルのストリングであって、前記第2のメモリセルの各々が、前記第2の半導体構造に隣接する第2の電荷蓄積構造のそれぞれの一部分と、前記第2の電荷蓄積構造の前記それぞれの一部分に隣接する第2の制御ゲートとを含む、第2のメモリセルのストリングと、を備えている。そして、前記第1の電荷蓄積構造が前記第1の半導体構造の周囲に完全に巻き付いており、また、前記第2の電荷蓄積構造が前記第2の半導体構造の周囲に完全に巻き付いている。更に、前記第1及び第2の半導体構造の間には制御ゲートが配置されていない。
メモリデバイス100はまた、メモリデバイス100へのコマンド、アドレス、およびデータの入力、ならびにメモリデバイス100からのデータおよび状態情報の出力を管理するように、入出力(I/O)制御回路112も含む。アドレスレジスタ114は、復号する前にアドレス信号をラッチするように、I/O制御回路112、ならびに横列デコーダ108および縦列デコーダ110と通信している。コマンドレジスタ124は、着信コマンドを拉致するように、I/O制御回路112および制御論理116と通信している。制御論理116は、コマンドに応じてメモリアレイ104へのアクセスを制御し、外部プロセッサ130に対する状態情報を生成する。制御論理116は、アドレスに応じて横列デコーダ108および縦列デコーダ110を制御するように、横列デコーダ108および縦列デコーダ110と通信している。
WLPitch200=WS+2(R+W)+CTF+Tsi (1)
ビット線ピッチBLPitch200は、以下のように表されてもよく、
BLPitch200=W+2Tsi+2CTF+OD (2)
距離WS、(R+W)、CTF、W、およびTsiは、図3Dに示されている。
WLPitch400=WS+2(R+W)+CTF+Tsi (3)
ビット線ピッチBLPitch400は、以下のように表されてもよく、
BLPitch400=0.5PS+0.5W+(R+W)+Tsi+CTF (4)
距離WS、(R+W)、CTF、PS、W、およびTsiは、図5Eに示されている。距離PSは、WSと実質的に同じ(例えば、同じ)であってもよい。半導体構造455の厚さ(例えば、項Tsi)は、ピッチBLPitch400において1回発生することに留意されたい。
WLPitchPA=WS+2(R+W)+2CTF+2Tsi+OD (5)
ビット線ピッチBLPitchPAは、以下のように表されてもよく、
BLPitchPA=W+2CTF+2Tsi+OD (6)
距離WS、(R+W)、CTF、OD、W、およびTsiは、図6に示されている。典型的な値については、CTF=20nm、Tsi=10nm、OD=30nm、WS=30nm、R=10nm、およびW=10nm、WLPitchPA=160nmおよびBLPitchPA=100nmである。
ΔWLPitch=CTF+Tsi+OD (7)
となり、明白にゼロよりも大きい。
ΔBLPitch(PA−400)=CTF+Tsi+OD‐0.5PS‐R‐0.5W (8)
負項にもかかわらず、等式(8)は依然として、典型的には、ゼロよりも大きい数をもたらす。例えば、CTF=20nm、Tsi=10nm、OD=30nm、PS=30nm、R=10nm、およびW=10nmという典型的な値については、ΔBLPitch(PA−400)=30nmである。つまり、「クオーターラップ」メモリセルに対するビット線ピッチは、典型的な値に基づいて、従来技術の「フルラップ」メモリセルに対するビット線ピッチよりも約30パーセント小さくなることが期待される。従来技術の「フルラップ」メモリセルのビット線ピッチおよび「ハーフラップ」セルのビット線ピッチが同じであるため、「クオーターラップ」メモリセルに対するビット線ピッチは、「ハーフラップ」メモリセルに対するビット線ピッチよりも約30パーセント小さくなることが期待されることに留意されたい。誘電体柱を伴う実施形態については、これは、部分的に、ワード線方向にあり、単一のワード線480に共通して連結された隣接「クオーターラップ」メモリセルが、単一の開口部の中に形成された単一の誘電体柱構造435(図5B)から形成される、柱4451および4452(図5E)に隣接して位置するが、ワード線方向にあり、単一のワード線280に共通して連結された隣接「ハーフラップ」メモリセルが、別個の開口部の中に形成された別個の誘電体から形成される、別個の柱235(図3D)に隣接して位置するためである。
202 半導体
204 誘電体
206 誘電体
208 誘電体
210 ハードマスク
212 開口部
214 半導体
216 誘電体
220 半導体
235 誘電体柱
255 半導体構造
260 電荷トラップ
265 制御ゲート
270 ソース選択ゲート
272 メモリセル
274 ドレイン選択ゲート
275 ソース/ドレイン領域
277 ソース/ドレイン領域
280 アクセス線(ワード線)
400 メモリアレイ
435 誘電体柱構造
440 開口部
445 誘電体柱
455 半導体構造
465 制御ゲート
470 ソース選択ゲート
472 メモリセル
474 ドレイン選択ゲート
480 アクセス線(ワード線)
Claims (10)
- メモリアレイであって、
実質的に垂直な第1及び第2の半導体構造と、
直列に結合された第1のメモリセルのストリングであって、前記第1のメモリセルの各々が、前記第1の半導体構造に隣接する第1の電荷蓄積構造のそれぞれの一部分と、前記第1の電荷蓄積構造の前記それぞれの一部分に隣接する第1の制御ゲートとを含む、第1のメモリセルのストリングと、
直列に結合された第2のメモリセルのストリングであって、前記第2のメモリセルの各々が、前記第2の半導体構造に隣接する第2の電荷蓄積構造のそれぞれの一部分と、前記第2の電荷蓄積構造の前記それぞれの一部分に隣接する第2の制御ゲートとを含む、第2のメモリセルのストリングと、
を備え、
前記第1の電荷蓄積構造が前記第1の半導体構造の周囲に完全に巻き付いており、前記第2の電荷蓄積構造が前記第2の半導体構造の周囲に完全に巻き付いており、
前記第1及び第2の半導体構造の間には制御ゲートが配置されていない、メモリアレイ。 - 前記第1の電荷蓄積構造と前記第2の電荷蓄積構造とは互いに離間されている、請求項1記載のメモリアレイ。
- 前記第1の制御ゲートは前記第2の制御ゲートから電気的に分離されている、請求項1記載のメモリアレイ。
- 前記第1の半導体構造によって、直列に結合された前記第1のメモリセルのストリングと直列に結合された第1の選択ゲートと、前記第2の半導体構造によって、直列に結合された前記第2のメモリセルのストリングと直列に結合された第2の選択ゲートと、を更に備える、請求項1記載のメモリアレイ。
- 前記第1の選択ゲートは、前記第1の電荷蓄積構造の他の部分と、前記第1の電荷蓄積構造の前記他の部分に隣接する制御ゲートとを含み、前記第2の選択ゲートは、前記第2の電荷蓄積構造の他の部分と、前記第2の電荷蓄積構造の前記他の部分に隣接する制御ゲートとを含む、請求項4記載のメモリアレイ。
- 前記第1及び第2の選択ゲートはプログラム可能である、請求項4記載のメモリアレイ。
- 前記第1及び第2の半導体構造の各々の中に、それらの上端に隣接するそれぞれのソース/ドレイン領域を更に備える、請求項1記載のメモリアレイ。
- メモリアレイを形成する方法であって、
半導体を形成することと、
前記半導体の一部分を除去して、実質的に垂直な第1及び第2の半導体構造を形成することと、
前記第1の半導体構造の周囲に完全に巻き付く第1の電荷蓄積構造を形成することと、
前記第2の半導体構造の周囲に完全に巻き付く第2の電荷蓄積構造を形成することと、
前記第1の電荷蓄積構造に隣接する複数の第1の制御ゲートを形成して、直列に結合された第1のメモリセルのストリングを形成することであって、前記第1のメモリセルの各々が、前記第1の電荷蓄積構造のそれぞれの一部分と、前記第1の電荷蓄積構造の前記それぞれの一部分に隣接する、前記複数の第1の制御ゲートのうちの第1の制御ゲートとを含む、ことと、
前記第2の電荷蓄積構造に隣接する複数の第2の制御ゲートを形成して、直列に結合された第2のメモリセルのストリングを形成することであって、前記第2のメモリセルの各々が、前記第2の電荷蓄積構造のそれぞれの一部分と、前記第2の電荷蓄積構造の前記それぞれの一部分に隣接する、前記複数の第2の制御ゲートのうちの第2の制御ゲートとを含む、ことと、
を含む方法。 - 前記複数の第2の制御ゲートから前記複数の第1の制御ゲートを電気的に分離することを更に含む、請求項8記載の方法。
- 前記半導体の前記一部分を除去して、前記第1及び第2の半導体構造を形成することは、前記第1及び第2の半導体構造をそれらの底部で互いに接続されたままにしておくことを含む、請求項8記載の方法。
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WO2012009076A3 (en) | 2012-05-10 |
US20140021530A1 (en) | 2014-01-23 |
US20120012921A1 (en) | 2012-01-19 |
JP5578460B2 (ja) | 2014-08-27 |
US9147681B2 (en) | 2015-09-29 |
WO2012009076A2 (en) | 2012-01-19 |
TW201220320A (en) | 2012-05-16 |
CN102986028B (zh) | 2016-01-20 |
EP2593966A4 (en) | 2014-05-07 |
JP5785286B2 (ja) | 2015-09-24 |
KR20130028791A (ko) | 2013-03-19 |
KR101395526B1 (ko) | 2014-05-14 |
EP2593966B1 (en) | 2016-04-20 |
TWI485712B (zh) | 2015-05-21 |
US20120273870A1 (en) | 2012-11-01 |
CN102986028A (zh) | 2013-03-20 |
US8237213B2 (en) | 2012-08-07 |
US8564045B2 (en) | 2013-10-22 |
EP2593966A2 (en) | 2013-05-22 |
JP2013531390A (ja) | 2013-08-01 |
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