JP2010045314A - 不揮発性半導体記憶装置及びその製造方法 - Google Patents
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Abstract
【解決手段】シリコン基板上にそれぞれ複数の絶縁膜12及び電極膜WLを交互に積層させて積層体を形成し、この積層体に積層方向に延びる貫通ホール17を形成する。次に、貫通ホール17を介して絶縁膜12をエッチングすることにより、電極膜WL間に隙間18を形成する。次に、貫通ホール17の側面及び隙間18の内面に沿って電荷蓄積層26を形成し、貫通ホール17の内部にシリコンピラーSPを埋設する。これにより、不揮発性半導体記憶装置1を製造する。
【選択図】図3
Description
先ず、本発明の第1の実施形態について説明する。
図1は、本実施形態に係る不揮発性半導体記憶装置を例示する斜視図であり、
図2は、本実施形態に係る不揮発性半導体記憶装置を例示する平面図であり、
図3は、図2に示すA−A’線による断面図である。
なお、図1においては、図を見易くするために、導電部分のみを示し、絶縁部分は図示を省略している。
(tb+tc)×2<S<(tb+tc+tt)×2 (1)
本実施形態に係る装置1においては、シリコンピラーSPの中央部がチャネルとして機能し、電極膜WLがコントロールゲートとして機能することにより、シリコンピラーSPと電極膜WLとの各交差部分に、メモリセルとなるSGT(Surrounding Gate Transistor:サラウンディングゲートトランジスタ)が形成される。SGTとは、チャネルの周囲をゲート電極が取り囲んだ構造のトランジスタである。そして、各メモリセルにおいて、電荷蓄積層26内の電子トラップに電子が捕らえられて蓄積されることにより、情報が記憶される。
上述の如く、本実施形態に係る不揮発性半導体記憶装置1においては、電極膜WL間に貫通ホール17に連通した隙間18が形成されており、電荷蓄積層26が隙間18の内面に沿って形成されているため、電荷蓄積層26における電荷が蓄積される部分26a間の実効的な距離が長い。これにより、ある部分26aに注入された電荷が、他の部分26aに移動する際の拡散距離が長く、隣り合うメモリセル間の干渉が抑制される。このため、メモリセルにデータを保持する際の信頼性が高い。
図4は、本比較例に係る不揮発性半導体記憶装置を例示する断面図である。
図4に示すように、本比較例においては、電極膜WL間に隙間18が形成されておらず、Z方向に平行な断面において、貫通ホール17の内面は直線状である。このため、この断面においては、電荷蓄積層26も直線状に形成されており、部分26a間の最短経路に沿って、部分26bが設けられている。
図5は、本実施形態に係る不揮発性半導体記憶装置を例示する平面図であり、
図6は、図5に示すB−B’線による断面図である。
図7は、本実施形態に係る不揮発性半導体記憶装置を例示する斜視図であり、
図8は、本実施形態に係る不揮発性半導体記憶装置を例示する平面図である。
本実施形態は、不揮発性半導体記憶装置の製造方法の実施形態である。
図9乃至図19は、本実施形態に係る不揮発性半導体記憶装置の製造方法を例示する工程断面図である。
(tb+tc)×2<S (2)
S<(tb+tc+tt)×2 (3)
Claims (5)
- それぞれ複数の絶縁膜及び電極膜が交互に積層され、積層方向に延びる貫通ホールが形成された積層体と、
前記貫通ホールの内部に埋設された半導体ピラーと、
前記電極膜と前記半導体ピラーとの間に設けられた電荷蓄積層と、
を備え、
前記電極膜間には、前記貫通ホールに連通した隙間が形成されており、前記電荷蓄積層は、前記隙間の内面に沿って形成されていることを特徴とする不揮発性半導体記憶装置。 - 前記電極膜と前記電荷蓄積層との間に設けられた絶縁性のブロック層と、
前記半導体ピラーと前記電荷蓄積層との間に設けられた絶縁性のトンネル絶縁層と、
をさらに備え、
前記電極膜間の距離をSとし、前記ブロック層の厚さをtbとし、前記電荷蓄積層の厚さをtcとし、前記トンネル絶縁層の厚さをttとするとき、下記数式を満たす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。
(tb+tc)×2<S<(tb+tc+tt)×2 - 一の前記貫通ホールに連通された前記隙間は、他の前記貫通ホールには連通されていないことを特徴とする請求項1または2に記載の不揮発性半導体記憶装置。
- 複数の前記貫通ホールが前記隙間を介して連通されていることを特徴とする請求項1または2に記載の不揮発性半導体記憶装置。
- それぞれ複数の絶縁膜及び電極膜を交互に積層させて積層体を形成する工程と、
前記積層体に積層方向に延びる貫通ホールを形成する工程と、
前記貫通ホールを介して前記絶縁膜をエッチングすることにより、前記電極膜間に隙間を形成する工程と、
前記貫通ホールの側面及び前記隙間の内面に沿って電荷蓄積層を形成する工程と、
前記貫通ホールの内部に半導体ピラーを埋設する工程と、
を備えたことを特徴とする不揮発性半導体記憶装置の製造方法。
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| JP2008210109A JP5279403B2 (ja) | 2008-08-18 | 2008-08-18 | 不揮発性半導体記憶装置及びその製造方法 |
| TW103101851A TWI576995B (zh) | 2008-08-18 | 2009-08-17 | 非揮發性半導體記憶裝置及其製造方法 |
| US12/542,276 US8193571B2 (en) | 2008-08-18 | 2009-08-17 | Stacked type nonvolatile semiconductor memory device and method of manufacturing same |
| KR1020090075617A KR101067561B1 (ko) | 2008-08-18 | 2009-08-17 | 불휘발성 반도체 메모리 디바이스 및 그 제조 방법 |
| TW098127627A TWI435442B (zh) | 2008-08-18 | 2009-08-17 | 非揮發性半導體記憶裝置及其製造方法 |
| TW106101303A TWI617010B (zh) | 2008-08-18 | 2009-08-17 | 非揮發性半導體記憶裝置及其製造方法 |
| KR1020110050775A KR101121297B1 (ko) | 2008-08-18 | 2011-05-27 | 불휘발성 반도체 메모리 디바이스 |
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| KR100866966B1 (ko) | 2007-05-10 | 2008-11-06 | 삼성전자주식회사 | 비휘발성 메모리 소자, 그 제조 방법 및 반도체 패키지 |
| JP5230274B2 (ja) * | 2008-06-02 | 2013-07-10 | 株式会社東芝 | 不揮発性半導体記憶装置 |
| JP2010010596A (ja) * | 2008-06-30 | 2010-01-14 | Toshiba Corp | 不揮発性半導体記憶装置及びその製造方法 |
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- 2011-05-27 KR KR1020110050775A patent/KR101121297B1/ko not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2008171838A (ja) * | 2007-01-05 | 2008-07-24 | Toshiba Corp | 半導体装置 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2011228709A (ja) * | 2010-04-20 | 2011-11-10 | Micron Technology Inc | マルチレベルアーキテクチャを有するフラッシュメモリ |
| JP2012038865A (ja) * | 2010-08-05 | 2012-02-23 | Toshiba Corp | 不揮発性半導体記憶装置および不揮発性半導体記憶装置の製造方法 |
| US8952443B2 (en) | 2010-09-01 | 2015-02-10 | Samsung Electronics Co., Ltd. | Three dimensional semiconductor memory devices and methods of fabricating the same |
| US9142563B2 (en) | 2010-09-01 | 2015-09-22 | Samsung Electronics Co., Ltd. | Three dimensional semiconductor memory devices and methods of fabricating the same |
| US9385139B2 (en) | 2010-09-01 | 2016-07-05 | Samsung Electronics Co., Ltd. | Three dimensional semiconductor memory devices and methods of fabricating the same |
| US8563378B2 (en) | 2010-09-27 | 2013-10-22 | Samsung Electronics Co., Ltd. | Manufacturing semiconductor devices |
| JP2012146773A (ja) * | 2011-01-11 | 2012-08-02 | Hitachi Kokusai Electric Inc | 不揮発性半導体記憶装置およびその製造方法 |
| JP2013098563A (ja) * | 2011-10-28 | 2013-05-20 | Samsung Electronics Co Ltd | メモリ装置 |
| US9601496B2 (en) | 2013-01-02 | 2017-03-21 | Samsung Electronics Co., Ltd. | Semiconductor device having sacrificial layer pattern with concave sidewalls and method fabricating the same |
| US10658376B2 (en) | 2015-12-09 | 2020-05-19 | Toshiba Memory Corporation | Semiconductor device including a blocking layer having a varying thickness |
| CN108538849A (zh) * | 2018-01-24 | 2018-09-14 | 东芯半导体有限公司 | 一种三维堆叠的闪存结构及其制备方法 |
| CN108538849B (zh) * | 2018-01-24 | 2021-03-19 | 东芯半导体股份有限公司 | 一种三维堆叠的闪存结构及其制备方法 |
| WO2019244373A1 (ja) * | 2018-06-19 | 2019-12-26 | キオクシア株式会社 | メモリデバイス |
| CN112262475A (zh) * | 2018-06-19 | 2021-01-22 | 铠侠股份有限公司 | 存储装置 |
| CN112262475B (zh) * | 2018-06-19 | 2024-01-23 | 铠侠股份有限公司 | 存储装置 |
| US11950414B2 (en) | 2018-06-19 | 2024-04-02 | Kioxia Corporation | Memory device |
Also Published As
| Publication number | Publication date |
|---|---|
| TWI576995B (zh) | 2017-04-01 |
| JP5279403B2 (ja) | 2013-09-04 |
| US8193571B2 (en) | 2012-06-05 |
| TW201434138A (zh) | 2014-09-01 |
| KR20110080134A (ko) | 2011-07-12 |
| KR20100021981A (ko) | 2010-02-26 |
| KR101121297B1 (ko) | 2012-03-22 |
| TW201721843A (zh) | 2017-06-16 |
| TW201011900A (en) | 2010-03-16 |
| TWI617010B (zh) | 2018-03-01 |
| US20100038699A1 (en) | 2010-02-18 |
| TWI435442B (zh) | 2014-04-21 |
| KR101067561B1 (ko) | 2011-09-27 |
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