JP2018186256A - プログラム性能を改善可能な不揮発性メモリセル - Google Patents
プログラム性能を改善可能な不揮発性メモリセル Download PDFInfo
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 17
- 229910052710 silicon Inorganic materials 0.000 claims description 17
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- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 description 10
- ALKWEXBKAHPJAQ-NAKRPEOUSA-N Asn-Leu-Asp-Asp Chemical compound NC(=O)C[C@H](N)C(=O)N[C@@H](CC(C)C)C(=O)N[C@@H](CC(O)=O)C(=O)N[C@@H](CC(O)=O)C(O)=O ALKWEXBKAHPJAQ-NAKRPEOUSA-N 0.000 description 6
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- 102000004196 processed proteins & peptides Human genes 0.000 description 1
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Abstract
【解決手段】活性領域101でセレクトゲートトランジスタ11、フォローイングゲートトランジスタ12及びアンチヒューズバラクタ13が直列に連結されている。フォローイングゲートトランジスタはセレクトゲートトランジスタとアンチヒューズバラクタとの間に配置されている。第1の導電型を有する第1のイオンウエル131及び第2のイオンウエル132が活性領域内に設けられている。フォローイングゲートトランジスタは第1のイオンウエルと部分的に重なっている。第2のイオンウエルは第1のイオンウエルのドープ濃度よりも低いドープ濃度を有する。
【選択図】図2
Description
10 バルクシリコン基板
11 セレクトゲートトランジスタ
12 フォローイングゲートトランジスタ
13 アンチヒューズバラクタ
20 SOI基板
100 中央の破線
101 活性領域
111 ソースドープ領域
112 第1のソース/ドレインドープ領域
113 第2のソース/ドレインドープ領域
114 ドレインドープ領域
121 ワード線ゲート
122 フォローイングゲート
123 アンチヒューズゲート
131 第1のイオンウエル
132 第2のイオンウエル
141 セレクトゲート酸化層
142 フォローイングゲート酸化層
143 アンチヒューズヒューズゲート酸化層
151 側壁スペーサー
152 側壁スペーサー
153 側壁スペーサー
201 シリコン層
202 絶縁層
203 ベース層
210 ディープイオンウエル
C メモリセル
CH チャネル
E ソース/ドレイン拡張領域
Claims (20)
- 第1の導電型を有するシリコン基板であって、該シリコン基板はトレンチ分離領域に取り囲まれた活性領域を含む、シリコン基板と、
前記活性領域で直列に連結されたセレクトゲートトランジスタ、フォローイングゲートトランジスタ及びアンチヒューズバラクタであって、該フォローイングゲートトランジスタは該セレクトゲートトランジスタと該アンチヒューズバラクタとの間に配置されている、セレクトゲートトランジスタ、フォローイングゲートトランジスタ及びアンチヒューズバラクタと、
前記活性領域内にある第1の導電型を有する第1のイオンウエルであって、前記フォローイングゲートトランジスタは該第1のイオンウエルと部分的に重なっている、第1のイオンウエルと、
前記活性領域内にある第1の導電型を有する第2のイオンウエルであって、該第2のイオンウエルは前記第1のイオンウエルと近接するとともに前記第1のイオンウエルのドープ濃度よりも低いドープ濃度を有する、第2のイオンウエルと、
を含む不揮発性メモリセル。 - 前記フォローイングゲートトランジスタは前記第2のイオンウエルと部分的に重なっている、請求項1に記載の不揮発性メモリセル。
- 前記セレクトゲートトランジスタは前記第1のイオンウエル内に配置されている、請求項1に記載の不揮発性メモリセル。
- 前記アンチヒューズバラクタは前記第2のイオンウエル内に配置されている、請求項1に記載の不揮発性メモリセル。
- 前記第1の導電型はP型である、請求項1に記載の不揮発性メモリセル。
- 前記第1のイオンウエルは低電圧Pウエルである、請求項5に記載の不揮発性メモリセル。
- 前記第1のイオンウエルは中電圧Pウエルである、請求項6に記載の不揮発性メモリセル。
- 前記セレクトゲートトランジスタは、ワード線ゲートと、前記ワード線ゲート及び前記活性領域の間にあるセレクトゲート酸化層と、前記ワード線ゲートの一方側に配置されたソースドープ領域と、前記ワード線ゲートの他方側に配置された第1のソース/ドレインドープ領域と、前記ソースドープ領域に連結された第1のソース/ドレイン拡張領域と、前記第1のソース/ドレインドープ領域に連結された第2のソース/ドレイン拡張領域と、前記第1のソース/ドレイン拡張領域及び前記第2のソース/ドレイン拡張領域の間にあるセレクトゲートチャネルとを含む、請求項1に記載の不揮発性メモリセル。
- 前記ソースドープ領域はビット線に電気的に連結されている、請求項8に記載の不揮発性メモリセル。
- 前記ソースドープ領域及び前記第1のソース/ドレインドープ領域は前記第1の導電型とは逆の第2の導電型を有する、請求項8に記載の不揮発性メモリセル。
- 前記ソースドープ領域及び前記第1のソース/ドレインドープ領域の双方は前記第1のイオンウエル内に配置されている、請求項8に記載の不揮発性メモリセル。
- 前記フォローイングゲートトランジスタはフォローイングゲートと、前記フォローイングゲート及び前記活性領域の間にあるフォローイングゲート酸化層と、前記フォローイングゲートに隣接する第1のソース/ドレインドープ領域と、前記第1のソース/ドレインドープ領域の反対側にある第2のソース/ドレインドープ領域と、前記第1のソース/ドレインドープ領域に連結された第3のソース/ドレイン拡張領域と、前記第2のソース/ドレインドープ領域に連結された第4のソース/ドレイン拡張領域と、前記第3のソース/ドレイン拡張領域及び前記第4のソース/ドレイン拡張領域の間にあるフォローイングゲートチャネルとを含む、請求項10に記載の不揮発性メモリセル。
- 前記第1のソース/ドレインドープ領域と、前記第1のソース/ドレインドープ領域に連結された前記第3のソース/ドレイン拡張領域とは前記第1のイオンウエル内に配置されている、請求項12に記載の不揮発性メモリセル。
- 前記第2のソース/ドレインドープ領域と、前記第2のソース/ドレインドープ領域に連結された前記第4のソース/ドレイン拡張領域とは前記第2のイオンウエル内に配置されている、請求項13に記載の不揮発性メモリセル。
- 前記第2のソース/ドレインドープ領域は第2の導電型を有する、請求項12に記載の不揮発性メモリセル。
- 前記フォローイングゲートチャネルは、前記第1のイオンウエルの一部と前記第2のイオンウエルの一部とから構成されている、請求項12に記載の不揮発性メモリセル。
- 前記アンチヒューズバラクタは、アンチヒューズゲートと、前記アンチヒューズゲート及び前記活性領域の間にあるアンチヒューズゲート酸化層と、前記アンチヒューズゲートに隣接する前記第2のソース/ドレインドープ領域と、前記第2のソース/ドレインドープ領域と反対側のドレインドープ領域と、前記第2のソース/ドレインドープ領域に連結された第5のソース/ドレイン拡張領域と、前記ドレインドープ領域に連結された第6のソース/ドレイン拡張領域とを含む、請求項12に記載の不揮発性メモリセル。
- 前記第5のソース/ドレイン拡張領域は前記アンチヒューズゲートの下で前記第6のソース/ドレイン拡張領域と合流する、請求項17に記載の不揮発性メモリセル。
- 前記第2のソース/ドレインドープ領域、前記第5のソース/ドレイン拡張領域、前記第6のソース/ドレイン拡張領域及び前記ドレインドープ領域は前記第2のイオンウエル内に配置されている、請求項17に記載の不揮発性メモリセル。
- 前記ドレインドープ領域は第2の導電型を有する、請求項17に記載の不揮発性メモリセル。
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