JP4822841B2 - 半導体記憶装置及びその製造方法 - Google Patents
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- H10B41/23—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates characterised by three-dimensional [3D] arrangements, e.g. with cells on different height levels with source and drain on different levels, e.g. with sloping channels
- H10B41/27—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates characterised by three-dimensional [3D] arrangements, e.g. with cells on different height levels with source and drain on different levels, e.g. with sloping channels the channels comprising vertical portions, e.g. U-shaped channels
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- H10B43/23—EEPROM devices comprising charge-trapping gate insulators characterised by three-dimensional [3D] arrangements, e.g. with cells on different height levels with source and drain on different levels, e.g. with sloping channels
- H10B43/27—EEPROM devices comprising charge-trapping gate insulators characterised by three-dimensional [3D] arrangements, e.g. with cells on different height levels with source and drain on different levels, e.g. with sloping channels the channels comprising vertical portions, e.g. U-shaped channels
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- H10D30/0413—Manufacture or treatment of FETs having insulated gates [IGFET] of FETs having charge-trapping gate insulators, e.g. MNOS transistors
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- H10D30/00—Field-effect transistors [FET]
- H10D30/60—Insulated-gate field-effect transistors [IGFET]
- H10D30/69—IGFETs having charge trapping gate insulators, e.g. MNOS transistors
- H10D30/693—Vertical IGFETs having charge trapping gate insulators
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- H10D30/60—Insulated-gate field-effect transistors [IGFET]
- H10D30/69—IGFETs having charge trapping gate insulators, e.g. MNOS transistors
- H10D30/694—IGFETs having charge trapping gate insulators, e.g. MNOS transistors characterised by the shapes, relative sizes or dispositions of the gate electrodes
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C16/00—Erasable programmable read-only memories
- G11C16/02—Erasable programmable read-only memories electrically programmable
- G11C16/04—Erasable programmable read-only memories electrically programmable using variable threshold transistors, e.g. FAMOS
- G11C16/0483—Erasable programmable read-only memories electrically programmable using variable threshold transistors, e.g. FAMOS comprising cells having several storage transistors connected in series
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Description
半導体基板と、
前記半導体基板のセルアレイ領域全面に形成されたセルアレイの共通ソース線となる不純物拡散層と、
前記半導体基板のセルアレイ領域上に一方向に細長いパターンをもって配列された、それぞれ金属又は金属シリサイドにより形成された複数層のゲート配線が絶縁膜で互いに分離されて積層されかつそれらのゲート配線と絶縁膜とが交互に露出する側面をもつ複数のゲート配線積層体と、
前記各ゲート配線積層体の側面に形成された絶縁性の電荷蓄積層を内部に含むゲート絶縁膜と、
前記ゲート配線の長手方向に所定ピッチで配列されて、少なくとも一側面が前記ゲート配線積層体に前記ゲート絶縁膜を介して対向し他の側面が素子分離絶縁膜に接する、前記不純物拡散層と同じ導電型でそれより低不純物濃度の複数のピラー状半導体と、
前記各ピラー状半導体の上面にコンタクトして、前記ゲート配線と直交するように形成されたデータ線と、を有することを特徴とする。
セルアレイ領域全面に不純物拡散層が形成された半導体基板上に、絶縁膜で互いに分離された複数の多結晶シリコン膜を形成する工程と、
前記複数の多結晶シリコン膜と絶縁膜の積層膜を短冊状にエッチングして、それぞれ複数層のゲート配線と絶縁膜とが交互に露出する側面をもつ細長いパターンの複数のゲート配線積層体を形成する工程と、
前記ゲート配線積層体を形成する工程の後、前記ゲート配線積層体の側面に電荷蓄積層を内部に含むゲート絶縁膜を形成する工程と、
一側面が前記ゲート配線積層体に前記ゲート絶縁膜を介して対向すると共に前記ゲート配線方向に所定ピッチで配列された、前記不純物拡散層と同じ導電型でそれより低不純物濃度の複数のピラー状半導体を形成する工程と、
前記ゲート配線積層体の前記ピラー状半導体に対向する側面と反対側の側面を露出させてこの面に金属膜を形成し、アニールを行って各ゲート配線をシリサイド化する工程と、
前記各ピラー状半導体の上面にコンタクトするように、前記ゲート配線と直交するデータ線を形成する工程と、を有することを特徴とする。
図1は、実施の形態1によるNAND型フラッシュメモリのメモリセルアレイの平面図であり、図2,図3及び図4はそれぞれ図1のI−I’,II−II’及びIII−III’断面図である。
図23は実施の形態2によるNAND型フラッシュメモリのメモリセルアレイ平面図を、図1と対応させて示している。図24は、図23のI−I’断面を図2に対応させて示している。
図25は、実施の形態3のNAND型フラッシュメモリのメモリセルアレイの平面図を、実施の形態1の図1に対応させて示している。図26は図25のI−I’断面図である。II−II’断面及びIII−III’断面はそれぞれ、図3及び図4と同じである。製造工程も実施の形態1と変わらない。
図27は、実施の形態4のメモリセルアレイ平面図であり、図28はそのI−I’断面図である。II−II’断面及びIII−III’断面はそれぞれ、図3及び図4と同じである。製造工程も実施の形態1と変わらない。
図29は、実施の形態5のメモリセルアレイ平面図である。これは、図27の実施の形態4と同様に、一つのゲート配線積層体2の両側面にゲート絶縁膜3を介して二つのピラー状シリコン4を対向させているが、これらを実施の形態4とは異なり、それぞれ別のビット線7a,7bに接続している。
図33は、実施の形態6のメモリセルアレイ平面図である。これは、一つのゲート配線積層体2の両側面にゲート絶縁膜3を介して二つのピラー状シリコン4を対向させている点で、図27の実施の形態4と共通する。また、一つのピラー状シリコン4に着目すると、その両側面にゲート配線積層体2を対向させている点で、図25の実施の形態3と共通する。
図35は、実施の形態7のメモリセルアレイ平面図である。これは、ゲート配線積層体2とピラー状シリコン4の配置は、図33の実施の形態6と同様であるが、ゲート配線積層体2の両側面にゲート絶縁膜3を介して対向する二つのピラー状シリコン4を別のビット線7a,7bに接続している。
ここまでの実施の形態では、積層されるゲート配線にW膜又はWSi膜を用いることにより、その低抵抗化を実現している。これに対して、ゲート配線に多結晶シリコン膜を用いた場合には、セルアレイがほぼ完成した状態でサリサイド(Self Aligned Silicide)技術によって多結晶シリコンゲート配線をシリサイド化する。
ここまでの実施の形態においては、縦積みされるNANDセルユニットについて、メモリセルと選択ゲートトランジスタを含めて、内部に電荷蓄積層を持つONO膜等のゲート絶縁膜を用いたが、NANDセルユニットの特性安定化のためには、上下の選択ゲートトランジスタのうち少なくとも一方について、電荷蓄積層を含まないゲート絶縁膜とすることは好ましい。
Claims (8)
- 半導体基板と、
前記半導体基板のセルアレイ領域全面に形成されたセルアレイの共通ソース線となる不純物拡散層と、
前記半導体基板のセルアレイ領域上に一方向に細長いパターンをもって配列された、それぞれ金属又は金属シリサイドにより形成された複数層のゲート配線が絶縁膜で互いに分離されて積層されかつそれらのゲート配線と絶縁膜とが交互に露出する側面をもつ複数のゲート配線積層体と、
前記各ゲート配線積層体の側面に形成された絶縁性の電荷蓄積層を内部に含むゲート絶縁膜と、
前記ゲート配線の長手方向に所定ピッチで配列されて、下面が前記不純物拡散層に接し、少なくとも一側面が前記ゲート配線積層体に前記ゲート絶縁膜を介して対向し他の側面が素子分離絶縁膜に接する、前記不純物拡散層と同じ導電型でそれより低不純物濃度の複数のピラー状半導体と、
前記各ピラー状半導体の上面にコンタクトして、前記ゲート配線と直交するように形成されたデータ線と、
を有し、
一つのピラー状半導体を用いて一つのNANDセルユニットが構成される
ことを特徴とする半導体記憶装置。 - 一つのゲート配線積層体とこれにゲート絶縁膜を介して対向する一つのピラー状半導体とによって一つのNANDセルユニットが構成され、各NANDセルユニットは、ピラー状半導体の最下部と最上部にこれに対向するゲート配線を選択ゲート線として形成された縦型選択ゲートトランジスタと、これらの選択ゲートトランジスタの間に形成されたゲート配線をワード線として複数個縦積みされた縦型メモリセルとを有する
ことを特徴とする請求項1記載の半導体記憶装置。 - 一つのピラー状半導体は、その一つの側面がゲート絶縁膜を介してゲート配線積層体に対向し残りの3側面が素子分離絶縁膜に接する
ことを特徴とする請求項2記載の半導体記憶装置。 - 前記NANDセルユニットの上下の縦型選択ゲートトランジスタのうち少なくとも一方が、電荷蓄積層を含まないゲート絶縁膜を有する
ことを特徴とする請求項2記載の半導体記憶装置。 - 前記不純物拡散層はN+型であり、
前記ピラー状半導体は、低不純物濃度のN−型層であり、上端部にビット線コンタクト用のN+型層が形成され、下端部にN+型層が形成されている
ことを特徴とする請求項2記載の半導体記憶装置。 - セルアレイ領域全面に不純物拡散層が形成された半導体基板上に、絶縁膜で互いに分離された複数の多結晶シリコン膜を形成する工程と、
前記複数の多結晶シリコン膜と絶縁膜の積層膜を短冊状にエッチングして、それぞれ複数層のゲート配線と絶縁膜とが交互に露出する側面をもつ細長いパターンの複数のゲート配線積層体を形成する工程と、
前記ゲート配線積層体を形成する工程の後、前記ゲート配線積層体の側面に電荷蓄積層を内部に含むゲート絶縁膜を形成する工程と、
前記不純物拡散層上に、一側面が前記ゲート配線積層体に前記ゲート絶縁膜を介して対向すると共に前記ゲート配線方向に所定ピッチで配列された、前記不純物拡散層と同じ導電型でそれより低不純物濃度の複数のピラー状半導体を形成する工程と、
前記ゲート配線積層体の前記ピラー状半導体に対向する側面と反対側の側面を露出させてこの面に金属膜を形成し、アニールを行って各ゲート配線をシリサイド化する工程と、
前記各ピラー状半導体の上面にコンタクトするように、前記ゲート配線と直交するデータ線を形成する工程と、
を有することを特徴とする半導体記憶装置の製造方法。 - 前記ゲート絶縁膜の形成工程は、
第1のシリコン酸化膜、電荷蓄積層となるシリコン窒化膜、第2のシリコン酸化膜ないしはシリコン酸化膜より誘電率の高い絶縁膜をこの順に堆積する工程と、
堆積されたゲート絶縁膜を前記ゲート配線積層体の側面に残してエッチングする工程とを有する
ことを特徴とする請求項6記載の半導体記憶装置の製造方法。 - 前記複数のピラー状半導体の形成工程は、
前記ゲート配線積層体が配列されその側面にゲート絶縁膜が形成された半導体基板上に半導体層を形成する工程と、
前記半導体層を結晶化するためのアニール工程と、
前記半導体層を複数のピラー状半導体に分離するためのパターニング工程とを有する
ことを特徴とする請求項6記載の半導体記憶装置の製造方法。
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| JP2005379017A JP4822841B2 (ja) | 2005-12-28 | 2005-12-28 | 半導体記憶装置及びその製造方法 |
| US11/616,522 US7696559B2 (en) | 2005-12-28 | 2006-12-27 | Semiconductor memory device including pillar-shaped semiconductor layers and a method of fabricating the same |
| US12/715,964 US8048741B2 (en) | 2005-12-28 | 2010-03-02 | Semiconductor memory device and method of fabricating the same |
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| JP4772656B2 (ja) * | 2006-12-21 | 2011-09-14 | 株式会社東芝 | 不揮発性半導体メモリ |
| JP4791949B2 (ja) * | 2006-12-22 | 2011-10-12 | 株式会社東芝 | 不揮発性半導体メモリ |
| JP4939955B2 (ja) * | 2007-01-26 | 2012-05-30 | 株式会社東芝 | 不揮発性半導体記憶装置 |
| JP4445514B2 (ja) | 2007-04-11 | 2010-04-07 | 株式会社東芝 | 半導体記憶装置 |
| US9449831B2 (en) | 2007-05-25 | 2016-09-20 | Cypress Semiconductor Corporation | Oxide-nitride-oxide stack having multiple oxynitride layers |
| US8633537B2 (en) | 2007-05-25 | 2014-01-21 | Cypress Semiconductor Corporation | Memory transistor with multiple charge storing layers and a high work function gate electrode |
| US20090179253A1 (en) | 2007-05-25 | 2009-07-16 | Cypress Semiconductor Corporation | Oxide-nitride-oxide stack having multiple oxynitride layers |
| JP2009016400A (ja) * | 2007-06-29 | 2009-01-22 | Toshiba Corp | 積層配線構造体及びその製造方法並びに半導体装置及びその製造方法 |
| JP2009016692A (ja) * | 2007-07-06 | 2009-01-22 | Toshiba Corp | 半導体記憶装置の製造方法と半導体記憶装置 |
| JPWO2009025368A1 (ja) * | 2007-08-22 | 2010-11-25 | 株式会社東芝 | 半導体記憶装置及び半導体記憶装置の製造方法 |
| JP5376789B2 (ja) * | 2007-10-03 | 2013-12-25 | 株式会社東芝 | 不揮発性半導体記憶装置及び不揮発性半導体記憶装置の制御方法 |
| JP2009094237A (ja) * | 2007-10-05 | 2009-04-30 | Toshiba Corp | 不揮発性半導体記憶装置 |
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| KR101226685B1 (ko) * | 2007-11-08 | 2013-01-25 | 삼성전자주식회사 | 수직형 반도체 소자 및 그 제조 방법. |
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| JPS59126674A (ja) * | 1983-01-10 | 1984-07-21 | Toshiba Corp | 情報記憶用半導体装置 |
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| JPH1093083A (ja) * | 1996-09-18 | 1998-04-10 | Toshiba Corp | 半導体装置の製造方法 |
| KR100628419B1 (ko) | 2003-02-26 | 2006-09-28 | 가부시끼가이샤 도시바 | 개선된 게이트 전극을 포함하는 불휘발성 반도체 기억 장치 |
| JP3927156B2 (ja) | 2003-02-26 | 2007-06-06 | 株式会社東芝 | 不揮発性半導体記憶装置 |
| JP2005026589A (ja) | 2003-07-04 | 2005-01-27 | Toshiba Corp | 半導体記憶装置及びその製造方法 |
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| JP2005093808A (ja) * | 2003-09-18 | 2005-04-07 | Fujio Masuoka | メモリセルユニット、それを備えてなる不揮発性半導体記憶装置及びメモリセルアレイの駆動方法 |
| JP2006073939A (ja) | 2004-09-06 | 2006-03-16 | Toshiba Corp | 不揮発性半導体記憶装置及び不揮発性半導体記憶装置の製造方法 |
| US7528447B2 (en) | 2005-04-06 | 2009-05-05 | Kabushiki Kaisha Toshiba | Non-volatile semiconductor memory and method for controlling a non-volatile semiconductor memory |
| JP4250617B2 (ja) | 2005-06-08 | 2009-04-08 | 株式会社東芝 | 不揮発性半導体記憶装置とその製造方法 |
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