JP2010045149A - 不揮発性半導体記憶装置 - Google Patents
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- H10D30/69—IGFETs having charge trapping gate insulators, e.g. MNOS transistors
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Abstract
【解決手段】メモリストリングスMSは、基板Baに対して垂直方向に延びる複数の柱状部CLmn、及び複数の柱状部CLmnの下端を連結させるように形成された連結部JPmnを有する半導体層SCmnを有する。ワード線WL1〜4は、この柱状部CLmnを取り囲む板状電極として形成されている。また、選択ゲート線SGは、カラム方向を長手方向として形成され、ビット線BLはロウ方向を長手方向として、1つの柱状部CLmnごとに形成されている。
【選択図】図2
Description
(第1の実施の形態に係る不揮発性半導体記憶装置100の構成)
図1は、本発明の第1の実施の形態に係る不揮発性半導体記憶装置100の概略図を示す。図1に示すように、第1の実施の形態に係る不揮発性半導体記憶装置100は、主として、メモリトランジスタ領域12、ワード線駆動回路13、選択ゲート線駆動回路15、センスアンプ16、及びバックゲートトランジスタ駆動回路18を有する。
次に、図8〜図14を参照して、第1の実施の形態に係る不揮発性半導体記憶装置100の製造方法を説明する。メモリトランジスタ領域12と、図示しない周辺回路領域は同時に形成されるが、ここでは説明の簡単のため、本実施の形態の特徴に関連するメモリトランジスタ領域12の製造工程のみを説明する。
次に、再び図1〜3を参照して、第1の実施の形態に係る不揮発性半導体記憶装置100の動作を説明する。メモリトランジスタMCにおける「書き込み動作」、、「消去動作」、及び「読み出し動作」について説明する。なお、以下では、図3に示すメモリトランジスタMC2を書き込み、読み出しの対象とする場合を例として説明する。
最初に、メモリストリングスMS中の、例えばメモリトランジスタMC2への書き込み動作を、図15を参照して説明する。まず、初期動作として、全てのビット線BL0〜2の電圧を接地電位VSSとし、バックゲート線BGの電圧を接地電位Vssとして、バックゲートトランジスタBT1、BT2を非導通状態に維持しておく。選択ゲートSGの電圧も接地電圧Vssとされ、選択トランジスタST1〜3も非導通状態にされている。
次に、メモリストリングスMS中のメモリトランジスタの消去動作を説明する。
続いて、メモリストリングスMS中の、例えばメモリトランジスタMC2の読み出し動作を、図16を参照して説明する。
次に、第1の実施の形態に係る不揮発性半導体記憶装置100の効果について説明する。第1の実施の形態に係る不揮発性半導体記憶装置100は、上記積層構造に示したように高集積化可能である。また、不揮発性半導体記憶装置100は、上記製造工程にて説明したように、メモリトランジスタMCとなる各層、選択トランジスタ層STとなる各層を、ワード線WLの積層数に関係なく所定のリソグラフィ工程数で製造することができる。すなわち、安価に不揮発性半導体記憶装置100を製造することが可能である。
図17は、本発明の第2のの実施の形態に係る不揮発性半導体記憶装置100の、メモリトランジスタ領域12の概略図を示す。図18はその平面図である。なお、第1の実施の形態と同一の構成要素に関しては同一の符号を付し、その説明は省略する。
なお、1つのメモリストリングスMSに含まれる柱状部CLmnの数は3本に限られず、複数であればよい。このとき、1つのメモリストリングスMS中に含まれる柱状部CLmnの数と、メモリトランジスタが形成される柱状部の実効面積との関係は、次のようになる。
柱状部CLmnが3本→6F2
柱状部CLmnが4本→5F2
柱状部CLmnが9本→4.5F2
すなわち、1つのメモリストリングスMS中に含まれる柱状部CLmnの数を増すほど、柱状部CLmnの実効面積を低減でき、メモリの高密度化に寄与することができる。
以上、本発明の実施の形態を説明したが、本発明はこれらに限定されるものではなく、発明の趣旨を逸脱しない範囲内において、様々な変更、追加、削除、置換等が可能である。たとえば、上記の実施の形態では、1つのメモリストリングスを形成する3つの柱状部CLmnを、いずれもポリシリコンを材料として形成すると説明したが、例えば、データが常に消去状態に維持されるメモリトランジスタMC5〜8に沿った柱状部CLmn2については、ポリシリコンの代わりに、例えば表面がコバルト等の金属と反応させてシリサイド化されたシリコン層又は金属膜(アルミニウム等)などの金属元素を含む化合物を用いることも可能である。あるいは、柱状部CLmn2のみ、高濃度の不純物(リン等)を注入して低抵抗化してもよい。この対策により、電圧降下が小さくなり、より安定した読み出し動作を保証できる.
また、上記の実施の形態では、1つのメモリストリングスMS中の少なくとも1列のメモリトランジスタMCは、常に消去状態に維持されるのが好ましいと説明したが、これに限らず、このような常に消去状態に維持されるメモリトランジスタMCを設けないこととしてもよい。この場合、選択ワード線WLの電位を接地電位Vssよりも高く設定する必要があり、読み出し電流量が最悪の場合第1の実施の形態の場合の半分程度に減少する可能性があるが、十分な感度のセンスアンプとノイズ対策が施されれば読み出し可能である。この場合、より有効なセルアレイ利用が可能となり、1つのメモリストリングスMSに含まれる柱状部の数に関わらず、4F2の柱状部の面積を実現でき、半導体メモリ装置の高密度化に寄与するものである。
Claims (5)
- 電気的に書き換え可能な複数のメモリセルと選択トランジスタとが直列に接続された複数のメモリストリングスを有する不揮発性半導体記憶装置であって、
前記メモリストリングスは、
基板に対して垂直方向に延びる複数の柱状部、及び前記複数の柱状部の下端を連結させるように第1方向を長手方向として形成された連結部を有する半導体層と、
前記柱状部の側面を取り囲むように形成された電荷蓄積層と、
前記柱状部の側面及び前記電荷蓄積層を取り囲むように複数層を積層して形成され前記メモリセルの制御電極として機能する複数の第1導電層と、
前記第1方向に並ぶ前記複数の柱状部の周りにゲート絶縁膜を介して前記第1方向を長手方向として形成され前記選択トランジスタの制御電極として機能する第2導電層と、
前記複数の柱状部のそれぞれに接続され前記第1方向と直交する第2方向を長手方向として形成されるビット線と
を備えたことを特徴とする不揮発性半導体記憶装置。 - 前記連結部に絶縁膜を介して接するように形成され前記連結部に形成されるバックゲートトランジスタの制御電極として機能するバックゲート層を更に備えたことを特徴とする請求項1に記載の不揮発性半導体記憶装置。
- 前記第1導電層は、前記基板上に2次元的に配列された複数の前記メモリストリングスに共通に接続される板状電極であることを特徴とする請求項1記載の不揮発性半導体記憶装置。
- 1つの前記メモリストリングスを構成する前記複数の柱状部のうち、少なくとも1つの柱状部に沿って形成される前記メモリセルは、常に消去状態に維持されることを特徴とする請求項1記載の不揮発性半導体記憶装置。
- 1つの前記メモリストリングスを構成する前記複数の柱状部の少なくとも1つは金属元素を含む化合物であることを特徴とする請求項1記載の不揮発性半導体記憶装置。
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| Application Number | Priority Date | Filing Date | Title |
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| JP2008207655A JP5288936B2 (ja) | 2008-08-12 | 2008-08-12 | 不揮発性半導体記憶装置 |
| US12/501,142 US8008710B2 (en) | 2008-08-12 | 2009-07-10 | Non-volatile semiconductor storage device |
| TW098124154A TWI400792B (zh) | 2008-08-12 | 2009-07-16 | 非揮發性半導體儲存裝置 |
| KR1020090073728A KR101031699B1 (ko) | 2008-08-12 | 2009-08-11 | 비휘발성 반도체 저장 장치 |
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| JP2008207655A JP5288936B2 (ja) | 2008-08-12 | 2008-08-12 | 不揮発性半導体記憶装置 |
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| JP2010045149A true JP2010045149A (ja) | 2010-02-25 |
| JP5288936B2 JP5288936B2 (ja) | 2013-09-11 |
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| JP (1) | JP5288936B2 (ja) |
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| TW (1) | TWI400792B (ja) |
Cited By (8)
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| JP2011198806A (ja) * | 2010-03-17 | 2011-10-06 | Toshiba Corp | 半導体記憶装置及びその製造方法 |
| KR101113766B1 (ko) * | 2010-12-31 | 2012-02-29 | 주식회사 하이닉스반도체 | 비휘발성메모리장치 및 그 제조 방법 |
| JP2012204430A (ja) * | 2011-03-24 | 2012-10-22 | Toshiba Corp | 不揮発性半導体記憶装置及びその製造方法 |
| US8349689B2 (en) | 2010-05-31 | 2013-01-08 | Hynix Semiconductor Inc. | Non-volatile memory device and method for fabricating the same |
| US8455941B2 (en) | 2010-06-22 | 2013-06-04 | Kabushiki Kaisha Toshiba | Nonvolatile semiconductor memory device and method for manufacturing the same |
| US8817538B2 (en) | 2011-06-14 | 2014-08-26 | Kabushiki Kaisha Toshiba | Nonvolatile semiconductor memory device and method for erasing data thereof |
| US8902670B2 (en) | 2012-08-31 | 2014-12-02 | Kabushiki Kaisha Toshiba | Semiconductor memory device |
| JP2015525971A (ja) * | 2012-07-06 | 2015-09-07 | マイクロン テクノロジー, インク. | 少なくとも2個のマスクを使用する階段形成 |
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| JP5016832B2 (ja) * | 2006-03-27 | 2012-09-05 | 株式会社東芝 | 不揮発性半導体記憶装置及びその製造方法 |
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| US8456909B2 (en) | 2010-12-31 | 2013-06-04 | Hynix Semiconductor Inc. | Nonvolatile memory device and method for fabricating the same |
| KR101113766B1 (ko) * | 2010-12-31 | 2012-02-29 | 주식회사 하이닉스반도체 | 비휘발성메모리장치 및 그 제조 방법 |
| JP2012204430A (ja) * | 2011-03-24 | 2012-10-22 | Toshiba Corp | 不揮発性半導体記憶装置及びその製造方法 |
| US8624316B2 (en) | 2011-03-24 | 2014-01-07 | Kabushiki Kaisha Toshiba | Nonvolatile semiconductor memory device and method of fabricating the same |
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| US9870941B2 (en) | 2012-07-06 | 2018-01-16 | Micron Technology, Inc. | Stair step formation using at least two masks |
| US10269626B2 (en) | 2012-07-06 | 2019-04-23 | Micron Technology, Inc. | Stair step formation using at least two masks |
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| US8902670B2 (en) | 2012-08-31 | 2014-12-02 | Kabushiki Kaisha Toshiba | Semiconductor memory device |
Also Published As
| Publication number | Publication date |
|---|---|
| TW201025574A (en) | 2010-07-01 |
| JP5288936B2 (ja) | 2013-09-11 |
| TWI400792B (zh) | 2013-07-01 |
| KR101031699B1 (ko) | 2011-04-29 |
| US20100038703A1 (en) | 2010-02-18 |
| KR20100020435A (ko) | 2010-02-22 |
| US8008710B2 (en) | 2011-08-30 |
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