JP2010171185A - 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】不揮発性半導体記憶装置1において、それぞれ複数の層間絶縁膜ILD及び制御ゲート電極CGを交互に積層させて積層体MLを形成する。そして、積層体MLに積層方向に延びる貫通ホールHを形成し、貫通ホールHを介して層間絶縁膜ILDにおける貫通ホールHに面した部分をエッチングして除去し、除去部分Aを形成する。次に、貫通ホールH及び除去部分Aの内面上に絶縁膜IPDを形成し、除去部分Aの内部にシリコンからなる浮遊ゲート電極FGを形成し、浮遊ゲート電極FGにおける貫通ホールHに面した部分を覆うように絶縁膜TOxを形成する。そして、貫通ホールHの内部に半導体ピラーSPを埋設する。
【選択図】図1
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断面図であり、
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斜視図である。
なお、図2においては、図示の便宜上、後述する制御ゲート電極CG、浮遊ゲート電極FG及び半導体ピラーSPのみを示している。
制御ゲート電極CGは、導電材料、例えば金属又は不純物が導入されたポリシリコンにより形成されている。また、層間絶縁膜ILD、絶縁膜IPD、絶縁膜TOxは、絶縁材料、例えばシリコン酸化物により形成されている。更に、浮遊ゲート電極FGはシリコンにより形成されている。更にまた、半導体ピラーSPは、半導体材料、例えば不純物が導入されたポリシリコンにより形成されている。
先ず、図1に示すように、基板(図示せず)上にそれぞれ複数の層間絶縁膜ILD及び制御ゲート電極CGを交互に積層させて積層体MLを形成する。次に、積層体MLに積層体MLの積層方向に延びる貫通ホールHを形成する。このとき、貫通ホールHの直径は、層間絶縁膜ILDの厚さよりも大きくする。次に、貫通ホールHを介して層間絶縁膜ILDにおける貫通ホールHに面した部分をエッチングして、環状に除去する。これにより、制御ゲート電極CG間に、層間絶縁膜ILDの除去部分Aを形成する。
図1に示すように、任意の浮遊ゲート電極FGにデータを書き込む場合は、その浮遊ゲート電極FGの両側に配置された一対の制御ゲート電極CGの電位を、チャネルである半導体ピラーSPの電位よりも高くする。これにより、カップリング効果により浮遊ゲート電極FGの電位が上昇し、トンネル効果によって半導体ピラーSPから絶縁膜TOxを介して浮遊ゲート電極FG内に電子が注入される。注入された電子は浮遊ゲート電極FG内に蓄積される。このようにして、この浮遊ゲート電極FGにデータが書き込まれる。
上述の如く、本実施形態に係る不揮発性半導体記憶装置においては、複数のメモリセルが3次元マトリクス状に配列されている。これにより、単位面積当たりのメモリセルの集積度を高くすることができる。また、積層体MLに貫通ホールHを一括で加工しているため、積層数を増やしても製造コストの増加を抑えることができる。
図3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4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断面図である。
なお、図3においては、図示の便宜上、導電体部分及び半導体部分の一部のみを示し、絶縁体部分は省略している。
本実施形態は、前述の第1の実施形態を、より実際のデバイスに近い態様に具体化した実施形態である。本実施形態の効果は、前述の第1の実施形態と同様である。
図5〜図16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。
図17は、本実施形態に係る不揮発性半導体記憶装置の動作を説明する模式的断面図である。
図17においては、説明の便宜上、1本のU字ピラー25が貫く制御ゲート電極CGに、ビット線BL側からソース線SL側に向かって、「CG1」〜「CG10」の符号を付している。同様に、1本のU字ピラー25が貫く浮遊ゲート電極FGに、ビット線BL側からソース線SL側に向かって、「FG1」〜「FG10」の符号を付している。また、1本のU字ピラー25が貫く2本の選択ゲート電極SGのうち、ビット線BL側の選択ゲート電極に「SGb」の符号を付し、ソース線SL側の選択ゲート電極に「SGs」の符号を付している。以下、データの書込動作、消去動作及び読込動作について説明する。
任意のU字ピラー25(以下、「選択ピラー」という)が貫く浮遊ゲート電極FG2にデータを書き込む場合について説明する。
先ず、選択ピラーが貫く選択ゲート電極SGbの電位を電源電位Vdd(例えば、3V)とする。また、選択ピラーが接続されているビット線BLの電位を接地電位GND(0V)とする。これにより、選択ゲート電極SGbと選択ピラーとの交差部分に形成されたビット線側の選択トランジスタがオン状態となる。一方、他のビット線BLの電位は電源電位Vdd(例えば、3V)とする。これにより、他のU字ピラー25のビット線側の選択トランジスタはオフ状態となる。
消去は全ての浮遊ゲート電極について一括して行う。
先ず、全ての制御ゲート電極CG及び導電膜PGの電位を接地電位GND(0V)とする。これにより、全ての浮遊ゲート電極FGの電位は、制御ゲート電極CG及び導電膜PGとのカップリングにより、接地電位GND(0V)に近い電位となる。
任意の選択ピラーが貫く浮遊ゲート電極FG2に書き込まれたデータを読み出す場合について説明する。
選択ピラーに接続されたビット線BLの電位を電位VBL(例えば、1V)とし、全てのソース線SLの電位を接地電位GND(0V)とする。また、選択ピラーが貫く選択ゲート電極SGb及びSGsの電位を電源電位Vdd(例えば、3V)とする。これにより、選択ピラーと選択ゲート電極SGb及びSGsとの交差部分にそれぞれ形成された選択トランジスタは、いずれもオン状態となる。
Claims (5)
- それぞれ複数の層間絶縁膜及び制御ゲート電極が交互に積層され、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、
前記制御ゲート電極間に設けられた浮遊ゲート電極と、
前記半導体ピラー及び前記浮遊ゲート電極と前記制御ゲート電極との間に設けられた第1絶縁膜と、
前記半導体ピラーと前記浮遊ゲート電極との間に設けられた第2絶縁膜と、
を備えたことを特徴とする不揮発性半導体記憶装置。 - 前記貫通ホールの直径は、前記層間絶縁膜の厚さよりも大きい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。
- 前記浮遊ゲート電極はシリコンにより形成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。
- それぞれ複数の層間絶縁膜及び制御ゲート電極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層間絶縁膜における前記貫通ホールに面した部分をエッチングして除去する工程と、
前記貫通ホール及び前記層間絶縁膜を除去した部分の内面上に第1絶縁膜を形成する工程と、
前記層間絶縁膜を除去した部分の内部に浮遊ゲート電極を形成する工程と、
前記浮遊ゲート電極における前記貫通ホールに面した部分を覆うように第2絶縁膜を形成する工程と、
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。 - 前記貫通ホールの直径を、前記層間絶縁膜の厚さよりも大きくすることを特徴とする請求項4記載の不揮発性半導体記憶装置の製造方法。
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JP2009012052A JP5388600B2 (ja) | 2009-01-22 | 2009-01-22 | 不揮発性半導体記憶装置の製造方法 |
US12/638,480 US8440528B2 (en) | 2009-01-22 | 2009-12-15 | Method for manufacturing a vertical nonvolatile semiconductor memory device including forming floating gates within the recesses created on the interlayer insulating films |
KR1020100005621A KR20100086435A (ko) | 2009-01-22 | 2010-01-21 | 불휘발성 반도체 기억 장치 및 그 제조 방법 |
US13/864,882 US9029934B2 (en) | 2009-01-22 | 2013-04-17 | Nonvolatile semiconductor memory device including floating gate electrodes formed between control gate electrodes and vertically formed along a semiconductor pillar |
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US20130223149A1 (en) | 2013-08-29 |
US20100181612A1 (en) | 2010-07-22 |
US8440528B2 (en) | 2013-05-14 |
JP5388600B2 (ja) | 2014-01-15 |
KR20100086435A (ko) | 2010-07-30 |
US9029934B2 (en) | 2015-05-12 |
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