JP2013531390A - 実質的に垂直な隣接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
実質的に垂直な隣接半導体構造を有するメモリアレイ、およびそれらの形成 Download PDFInfo
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Abstract
【選択図】図5E
Description
電荷トラップ260の一部分、およびその下にあり、かつ半導体構造2552の側壁上にある誘電体208は、図2Dに示されるように、メモリセル列2722の逐次メモリセル2722の逐次制御ゲート2652,2の間に間置され、したがって、メモリセル列2722の逐次制御ゲート2652を互いに電気的に絶縁する。
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。
図5Eを参照すると、アクセス線(例えば、ワード線)ピッチWLPitch400およびデータ線(例えば、ビット線)ピッチBLPitch400が、メモリアレイ400について示されている。ワード線ピッチWLPitch400は、以下のように表されてもよく、
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。
ワード線ピッチWLPitchPAは、以下のように表されてもよく、
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。
具体的実施形態が本明細書で図示および説明されているが、同じ目的を達成するように計算される任意の配設が、示された具体的実施形態に代替されてもよいことが、当業者によって理解されるであろう。実施形態の多くの適合が、当業者に明白となるであろう。したがって、本願は、実施形態のいかなる適合または変形をも対象とすることを目的としている。
Claims (23)
- 第1および第2の実質的に垂直な隣接半導体構造と、
複数の第1および第2の電荷貯蔵構造であって、前記第1の電荷貯蔵構造はそれぞれ、前記第1の半導体構造に隣接し、前記第2の電荷貯蔵構造はそれぞれ、前記第2の半導体構造に隣接する、電荷貯蔵構造と、
複数の第1および第2の制御ゲートであって、前記第1の制御ゲートはそれぞれ、前記第1の電荷貯蔵構造のうちのそれぞれ1つに隣接し、前記第2の制御ゲートはそれぞれ、前記第2の電荷貯蔵構造のうちのそれぞれ1つに隣接する、制御ゲートと、
を備え、
第1の直列に連結されたメモリセル列の各メモリセルは、前記第1の制御ゲートのうちのそれぞれ1つと、前記第1の電荷貯蔵構造のうちのそれぞれ1つとを備え、
第2の直列に連結されたメモリセル列のうちの各メモリセルは、前記第2の制御ゲートのうちのそれぞれ1つと、前記第2の電荷貯蔵構造のうちのそれぞれ1つとを備え、
いずれの制御ゲートも、前記隣接半導体構造の間に間置されない、
メモリアレイ。 - 前記第1および第2の半導体構造はそれぞれ、誘電体柱の側壁のそれぞれの対向部分を包み込む、請求項1に記載のメモリアレイ。
- 前記第1および第2の半導体構造は、それらの底部でともに接続される、請求項1に記載のメモリアレイ。
- 前記第1の電荷貯蔵構造は、第1の連続電荷トラップを備え、前記第2の電荷貯蔵構造は、第2の連続電荷トラップを備える、請求項1に記載のメモリアレイ。
- 前記電荷トラップはそれぞれ、トンネル誘電体と、電荷捕獲材料と、遮断誘電体とを備える、請求項4に記載のメモリアレイ。
- 前記第1の電荷トラップおよび前記第2の電荷トラップは、単一の連続構造を備える、請求項4に記載のメモリアレイ。
- 前記単一の連続構造の複数部分が、前記半導体構造の側壁の間に間置される、請求項6に記載のメモリアレイ。
- 前記単一の連続構造は、誘電体柱および前記半導体構造の周辺に完全に巻き付けられる、請求項7に記載のメモリアレイ。
- それらの上端に隣接する、前記半導体構造のうちのそれぞれの中にそれぞれのソース/ドレイン領域をさらに備える、請求項1に記載のメモリアレイ。
- 前記制御ゲートのそれぞれは、誘電体によって、その列の中の逐次制御ゲートから電気的に絶縁される、請求項1に記載のメモリアレイ。
- 前記第1および第2の電荷貯蔵構造は、分離した第1および第2の電荷トラップであり、前記第1の電荷トラップの前記それぞれは、前記第1の半導体構造を完全に包み込み、前記第2の電荷トラップの前記それぞれは、前記第2の半導体構造を完全に包み込む、請求項1に記載のメモリアレイ。
- 第3および第4の実質的に垂直な隣接半導体構造であって、いずれの半導体構造も、前記第1および第3の半導体構造と、前記第2および第4の半導体構造との間に間置されない、半導体構造と、
前記第3の半導体構造に隣接する、第3の直列に連結されたメモリセル列と、
前記第4の半導体構造に隣接する、第4の直列に連結されたメモリセル列と、
をさらに備える、請求項1に記載のメモリアレイ。 - 前記第3の直列に連結されたメモリセル列の各メモリセルは、前記第3の半導体構造に隣接する第3の電荷貯蔵構造と、前記第3の電荷貯蔵構造に隣接する第3の制御ゲートとを備え、前記第4の直列に連結されたメモリセル列の各メモリセルは、前記第4の半導体構造に隣接する第4の電荷貯蔵構造と、前記第4の電荷貯蔵構造に隣接する第4の制御ゲートとを備える、請求項12に記載のメモリアレイ。
- 前記第1の直列に連結されたメモリセル列のうちの1つのメモリセルの前記第1の制御ゲート、および前記第3の直列に連結されたメモリセル列のうちの1つのメモリセルの前記第3の制御ゲートは、第1の単一アクセス線に連結され、前記第2の直列に連結されたメモリセル列のうちの1つのメモリセルの前記第2の制御ゲート、および前記第4の直列に連結されたメモリセル列のうちの1つのメモリセルの前記第4の制御ゲートは、第2の単一アクセス線に連結される、請求項13に記載のメモリアレイ。
- 前記第1および第2の半導体構造はそれぞれ、第1の誘電体柱の側壁のそれぞれの対向部分を包み込み、前記第3および第4の半導体構造はそれぞれ、第2の誘電体柱の側壁のそれぞれの対向部分を包み込む、請求項14に記載のメモリアレイ。
- 前記第1および第2の誘電体柱は、単一の開口部内に形成される、単一の誘電体柱構造から形成される、請求項14に記載のメモリアレイ。
- 第1および第2の半導体構造を形成することと、
前記第1の半導体構造に隣接する電荷貯蔵構造の第1の部分、および前記第2の半導体構造に隣接する前記電荷貯蔵構造の第2の部分を形成することと、
前記第1の半導体構造が、第1のメモリセルを直列に連結して、直列に連結された第1のメモリセル列を形成するように、第1の制御ゲートおよび前記電荷貯蔵構造の前記第1の部分の各交差点に第1のメモリセルを形成するよう、前記電荷貯蔵構造の前記第1の部分に隣接する第1の制御ゲートを形成することと、
前記第2の半導体構造が、第2のメモリセルを直列に連結して、直列に連結された第2のメモリセル列を形成するように、第2の制御ゲートおよび前記電荷貯蔵構造の前記第2の部分の各交差点に第2のメモリセルを形成するよう、前記電荷貯蔵構造の前記第2の部分に隣接する第2の制御ゲートを形成することと、
を含み、各第1の制御ゲートは、各第2の制御ゲートから電気的に絶縁される、
メモリアレイを形成する方法。 - 誘電体柱を形成することと、
前記誘電体柱に隣接する半導体を形成することと、
前記第1および第2の半導体構造を形成するように、および前記誘電体柱の一部分を露出するように、前記誘電体柱から前記半導体の一部分を除去することと、
をさらに含む、請求項17に記載の方法。 - 前記誘電体柱の前記露出した部分に隣接する、前記電荷貯蔵構造の第3の部分を形成することをさらに含み、前記電荷貯蔵構造の前記第1、第2、および第3の部分は、前記電荷貯蔵構造が前記誘電体柱を完全に包み込むように連続的である、請求項18に記載の方法。
- 前記半導体は、第1の半導体であり、前記誘電体柱を形成することは、第2の半導体を覆って形成される、交互の第1および第2の誘電体を通して、前記第1の半導体で裏打ちされた開口部を形成することと、前記第1の半導体で裏打ちされた前記開口部内で前記誘電体柱を形成することとを含む、請求項18に記載の方法。
- 前記電荷貯蔵構造の前記第1および第2の部分を形成することは、前記第1の誘電体を除去することと、前記第2の誘電体に隣接する前記電荷貯蔵構造を形成することとを含む、請求項20に記載の方法。
- 前記第2の誘電体は、前記直列に連結された第1のメモリセル列の隣接する第1のメモリセルと、前記直列に連結された第2のメモリセル列の隣接する第2のメモリセルとの間に間置される、請求項21に記載の方法。
- 半導体柱を形成することと、
前記第1および第2の半導体構造を形成するように、前記半導体柱の一部分を除去することと、
をさらに含む、請求項17に記載の方法。
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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 |
JP2014140054A (ja) | 2014-07-31 |
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 |
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