JP2007536744A - 分割チャネルアンチヒューズアレイ構造 - Google Patents
分割チャネルアンチヒューズアレイ構造 Download PDFInfo
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Abstract
Description
標準ゲート酸化膜オーバー基板コンデンサとして形成される。MOSスイッチの場合よりも小であることが求められるアンチヒューズコンデンサの酸化膜絶縁破壊電圧を低減するため、コンデンサ領域内にV字形のグローブが提案された。コンデンサはポリゲートと接地p型基板との間に形成されるので、破壊電圧はアクセストランジスタを介してコンデンサに印加されなければならなかった。アクセストランジスタのゲート/ドレーンエッジ、及びゲート/ソースエッジは、第2フィールド酸化膜に、チャンネル領域のゲート酸化膜よりもかなり厚く配置され、ゲート/S−D絶縁破壊電圧は大きく改善された。
Claims (29)
- 半導体材料上に形成されたアンチヒューズトランジスタであって、
基板内の、チャンネルが所定の長さを有するチャンネル領域上のポリシリコンゲートと、
前記チャンネル領域の第1の端に近接した拡散領域と、
前記チャンネル領域の第2の端に近接した隔離領域と、
前記ポリシリコンゲートと前記基板との間に、前記チャネル領域の第1の端から所定長さの予め決められた場所まで延伸する厚いゲート酸化膜、及び前記予め決められた場所から前記チャネル領域の第2の端まで延伸する薄いゲート酸化膜を有する可変厚さゲート酸化膜と、
前記ポリシリコンゲートと前記拡散領域との間に電流を伝導する前記チャンネル領域の第1の端に近接する破壊抵抗アクセスエッジと、
前記チャンネル領域の第2の端に近接した、前記ポリシリコンゲートと前記チャンネル領域との間に導電性リンクを形成するため可溶性の酸化膜破壊ゾーンとを有するアンチヒューズトランジスタ。 - 前記隔離領域は、前記薄いゲート酸化膜に近接して、フィールド酸化膜領域、浮遊拡散領域、及び前記フィールド酸化膜と浮遊拡散領域とが連結したもののうちの1つを有する、請求項1に記載のアンチヒューズトランジスタ。
- 前記薄いゲート酸化膜は、前記半導体材料上に形成された少なくとも1つの低圧トランジスタゲート酸化膜と同一である、請求項1に記載のアンチヒューズトランジスタ。
- 前記厚いゲート酸化膜は、前記半導体材料上に形成された少なくとも1つの高圧トランジスタゲート酸化膜と同一である、請求項3に記載のアンチヒューズトランジスタ。
- 前記厚いゲート酸化膜部分は、中間ゲート酸化膜と前記薄いゲート酸化膜部分との組合せを含む、請求項4に記載のアンチヒューズトランジスタ。
- 前記浮遊拡散領域、前記チャンネル領域の第2の端、及び前記ポリシリコンゲートのゲートエッジは、互いにある角度をなす少なくとも2本の線分によって決められた共通のエッジを有している、請求項2に記載のアンチヒューズトランジスタ。
- 前記角度は、135度及び90度である、請求項6に記載のアンチヒューズトランジスタ。
- 前記拡散領域は、前記低圧トランジスタの1つであるLDDインプラントと同一なLDDインプラント、高圧トランジスタ、並びに、低圧及び高圧トランジスタの両方を結合したものを有する、請求項4に記載のアンチヒューズトランジスタ。
- 前記拡散領域のエッジ及び前記ポリシリコンゲートの一部は、サリサイド化されていない、請求項1に記載のアンチヒューズトランジスタ。
- 行及び列に配置された複数のアンチヒューズトランジスタと、各アンチヒューズトランジスタは、基板内の、チャンネルが所定の長さを有するチャンネル領域上のポリシリコンゲートと、前記チャンネル領域の第1の端に近接した拡散領域と、前記ポリシリコンゲートと前記基板との間に、前記チャネル領域の第1の端から所定長さの予め決められた場所まで延伸する厚いゲート酸化膜、及び前記予め決められた場所から前記チャネル領域の第2の端まで延伸する薄いゲート酸化膜を有する可変厚さゲート酸化膜と、前記チャンネル領域の第2の端に近接した、前記ポリシリコンゲートと前記チャンネル領域との間に導電性リンクを形成するため可溶性の酸化膜破壊ゾーンを有し、
前記アンチヒューズトランジスタの列の拡散領域に連結されたビットラインと、
前記アンチヒューズトランジスタの行の前記ポリシリコンゲートに連結されたワードラインを含むアンチヒューズメモリーアレイ。 - 隔離装置を介して一対の前記ビットラインに連結された感度増幅器をさらに含む、請求項10に記載のアンチヒューズメモリーアレイ。
- 単一エンド(single-ended)の検出操作用の一対の前記ビットラインのうちの1本に連結された1つのアンチヒューズトランジスタに選択的にアクセスし、また、別のアドレス用の一対の前記ビットラインのうちの他の1本に連結されたもう1つのアンチヒューズトランジスタに選択的にアクセスするワードラインデコーディング回路をさらに含む、請求項11に記載のアンチヒューズメモリーアレイ。
- 一対の前記ビットラインのうちの1本に連結された1つのアンチヒューズトランジスタに選択的にアクセスし、また、デュアルエンド(dual-ended)の検出操作用の一対の前記ビットラインのうちの他の1本に連結された1つのアンチヒューズトランジスタに選択的にアクセスするワードラインデコーディング回路をさらに含む、請求項11に記載のアンチヒューズメモリーアレイ。
- 前記ビットラインに連結された列セレクトパスゲートをさらに含み、前記列セレクトパスゲートの少なくとも1つは、前記厚いゲート酸化膜と同一のゲート酸化膜を有する、請求項10に記載のアンチヒューズメモリーアレイ。
- チャネル領域及び拡散領域を有するアンチヒューズトランジスタ用の可変厚さゲート酸化膜を形成する方法であって、
a)前記チャネル領域及び拡散領域を取り囲むフィールド酸化膜を形成する工程、
b)前記チャネル領域に中間酸化膜を成長させる工程、
c)前記チャネル領域の薄い酸化膜領域から前記中間酸化膜を除去する工程、
d)前記薄い酸化膜領域及び前記中間酸化膜の上に、薄い酸化膜を成長させる工程、
e)前記薄い酸化膜、前記中間酸化膜、及び前記フィールド酸化膜の上にコモンゲートを形成する工程、及び
f)前記中間酸化膜に隣接して前記拡散領域を形成する工程を含む可変厚さゲート酸化膜の形成方法。 - 前記アンチヒューズトランジスタ及び低圧トランジスタは、半導体材料上に形成され、前記低圧トランジスタは、前記薄い酸化膜と同様な絶縁体構造を有する、請求項15に記載の方法。
- 前記拡散領域を形成する工程は、前記薄い酸化膜領域に隣接する浮遊拡散領域を同時に形成することを含む、請求項15に記載の方法。
- 前記中間酸化膜は、前記コモンゲートの第1の端から前記チャネル領域の予め決められた長さまで延伸し、及び前記薄い酸化膜領域上の前記薄いゲート酸化膜は、前記チャネル領域の前記予め決められた長さから前記コモンゲートの第2の端まで延伸する、請求項15に記載の方法。
- 前記予め決められ長さは、マスク工程を介して決定される、請求項18に記載の方法。
- 前記薄い酸化膜は、同じ半導体材料上で低圧トランジスタゲート酸化膜を形成するのと同じプロセス工程で形成される、請求項15に記載のアンチヒューズトランジスタ。
- 前記薄い酸化膜及び前記中間酸化膜から構成された厚い酸化膜は、同じ半導体材料上で高圧トランジスタゲート酸化膜を形成するのと同じプロセス工程で形成される、請求項15に記載のアンチヒューズトランジスタ。
- 前記拡散領域の上にサリサイド保護酸化膜を選択的に成長させる工程、及び前記コモンゲート及び前記拡散領域をサリサイド化する工程をさらに含む、請求項15に記載の方法。
- 半導体材料上に形成されたアンチヒューズトランジスタであって、
活性チャネル領域と、
可溶エッジ及びアクセスエッジを区画する前記活性チャネル領域の上に形成されたポリシリコンゲートと、
前記アクセスエッジに隣接した厚いゲート酸化膜と、
前記アクセスエッジに隣接した第1の拡散領域と、
前記可溶エッジに隣接した第2の拡散領域と、
前記可溶エッジに隣接し、前記ポリシリコンゲートと前記活性チャネル領域との間に導電性リンクを形成する前記厚いゲート酸化膜よりも低い破壊電圧を有する、前記活性チャネル領域上の薄いゲート酸化膜とを含むアンチヒューズトランジスタ。 - 前記可溶エッジの長さは、互いにある角度をなす前記ポリシリコンゲートの少なくとも2本の線分によって決定される、請求項23に記載のアンチヒューズトランジスタ。
- 前記可溶エッジの長さは、前記活性チャネル領域の幅よりも大きい、請求項23に記載のアンチヒューズトランジスタ。
- 前記ポリシリコンゲートは、前記可溶エッジと前記アクセスエッジとの間に前記活性チャネル領域を区画し、また、前記厚いゲート酸化膜及び前記薄いゲート酸化膜は、前記チャネル領域と前記ポリシリコンゲートとの間に配置され、前記厚いゲート酸化膜は、前記アクセスエッジから前記活性チャネル領域の予め決められた長さまで延伸し、さらに、前記薄いゲート酸化膜は、前記活性チャネル領域の予め決められた長さから前記可溶エッジまで延伸する、請求項23に記載のアンチヒューズトランジスタ。
- 前記厚いゲート酸化膜は、中間酸化膜と前記薄い酸化膜との組合せである、請求項26に記載のアンチヒューズトランジスタ。
- 前記ポリシリコンゲートは、前記厚いゲート酸化膜の上に配置されるとともに前記活性チャネル領域を区画するための前記拡散領域に隣接して配置された第1部分、前記第1部分のエッジによって区画された前記アクセスエッジ、前記薄いゲート酸化膜の上に配置されるとともに前記第1部分に連結された第2部分、前記第2部分によって区画された前記可溶エッジ、及び前記可溶エッジと前記活性チャネル領域との間に配置された前記第2の拡散領域を有する、請求項23に記載のアンチヒューズトランジスタ。
- 半導体材料上に形成されたアンチヒューズトランジスタであって、
活性チャネル領域と、
可溶エッジ、アクセスエッジ及び隔離エッジを区画する前記活性チャネル領域の上に形成されたポリシリコンゲートと、
前記アクセスエッジに隣接した厚いゲート酸化膜と、
前記アクセスエッジに隣接した拡散領域と、
前記隔離エッジに隣接したフィールド酸化膜と、
前記厚いゲート酸化膜と前記隔離エッジとの間に、前記ポリシリコンゲートと前記活性チャネル領域との間に導電性リンクを形成する前記厚いゲート酸化膜よりも低い破壊電圧を持った可溶領域を有する薄いゲート酸化膜を含むアンチヒューズトランジスタ。
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Also Published As
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WO2005109516A1 (en) | 2005-11-17 |
CA2520140C (en) | 2007-05-15 |
JP4981661B2 (ja) | 2012-07-25 |
CA2520140A1 (en) | 2005-11-17 |
EP1743380A1 (en) | 2007-01-17 |
EP1743380B1 (en) | 2016-12-28 |
KR101144218B1 (ko) | 2012-05-10 |
US7642138B2 (en) | 2010-01-05 |
IL179080A0 (en) | 2007-03-08 |
US8283751B2 (en) | 2012-10-09 |
IL179080A (en) | 2011-07-31 |
US20080038879A1 (en) | 2008-02-14 |
US20060244099A1 (en) | 2006-11-02 |
US20080246098A1 (en) | 2008-10-09 |
EP1743380A4 (en) | 2009-08-05 |
US7402855B2 (en) | 2008-07-22 |
KR20070010077A (ko) | 2007-01-19 |
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