JP2008103429A - 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】基板と、前記基板に対して垂直に形成された柱状半導体と、前記柱状半導体の周りに形成された第1の絶縁膜と、前記第1の絶縁膜の周りに形成された電荷蓄積層と、前記電荷蓄積層の周りに形成された第2の絶縁膜と、前記第2の絶縁膜の周りに形成された導電体層7とを有する電気的に書き換え可能なメモリセルが直列に接続されたメモリストリングスと、前記導電体層7と駆動回路3とを接続するコンタクトとを備え、前記導電体層7の端部は前記基板に対して上方に折り曲げられ、且つ折り曲げられた前記導電体層7の各端面上に前記コンタクトが設けられていることを特徴とする不揮発性半導体記憶装置1を構成する。
【選択図】図1
Description
本発明の第1の実施形態に係る不揮発性半導体記憶装置1の概略構成図を図1に示す。本発明の第1の実施形態に係る不揮発性半導体記憶装置1は、メモリトランジスタ領域2、ワード線駆動回路3、ソース側選択ゲート線(SGS)駆動回路4、ドレイン側選択ゲート線(SGD)駆動回路5、センスアンプ6、ワード線WL7、ビット線BL8、ソース側選択ゲート線SGS30、ドレイン側選択ゲート線SGD31等を有している。図1に示すように、本発明の第1の実施形態に係る不揮発性半導体記憶装置1においては、メモリトランジスタ領域2を構成するメモリトランジスタは、半導体層を複数積層することによって一括して形成されている。また、図1に示すとおり各層のワード線WL7は、メモリトランジスタ領域2において2次元的に広がり、ビット線8に直交する方向の少なくとも一方の端部は、基板に対して上方に折り曲げられ、且つCMP処理等により平坦化され平らな端面を有する。また、前記ワード線WL7と前記ワード線駆動回路3とを接続するコンタクトは、前記それぞれのワード線WL7の露出した端面上に、同一の加工工程で一括して形成される。従って、コンタクトの加工が容易になる。
図4は、本発明の第1の実施形態に係る不揮発性半導体記憶装置1において、点線で示したメモリトランジスタMTr321(40)のデータの読み出し動作を行う場合のバイアス状態を示した図である。ここでは、本実施形態におけるメモリトランジスタMTrは、所謂MONOS型縦型トランジスタであり、電荷蓄積層に電子が蓄積されていない状態のメモリトランジスタMTrのしきい値Vth(中性しきい値)が0V付近にあるとして説明する。
図5は、本発明の第1の実施形態に係る不揮発性半導体記憶装置1において、点線で示したメモリトランジスタMTr321(40)のデータの書き込み動作を行う場合のバイアス状態を示した図である。
データの消去は、複数のメモリストリングスからなるブロック単位で行う。図6は、本発明の第1の実施形態に係る不揮発性半導体記憶装置1において、選択したブロックのメモリトランジスタMTrのデータの消去動作を行う場合の選択ブロックのバイアス状態を示した図である。図7は、本発明の第1の実施形態に係る不揮発性半導体記憶装置1において、消去動作時における非選択ブロックのバイアス状態を示した図である。
本発明の第1の実施形態に係る不揮発性半導体記憶装置は、詳細な製造方法は以下に説明するが、概略下部セレクトゲート(SGS)層を形成した後、メモリセル層及び上部セレクトゲート(SGD)層を一括して堆積し、前記2層のチャネル部を形成するためのホールをフォトエッチング工程で一括して形成して、ホールにアモルファスシリコン (a−Si)やポリシリコン(Poly−Si)等を堆積してチャネルを形成し、更にワード線とワード線駆動回路を接続するためのビアホールを形成する工程を経る。ここで、メモリセル層を3次元的に積層する不揮発性半導体記憶装置においては、メモリセル領域は、2次元の平板構造部分を有するワード線電極となるアモルファスシリコン膜(又は、ポリシリコン膜でもよい。)に複数のメモリセルが形成されたメモリセル層が、3次元的(即ち、立体的。)に複数積層されて形成されるため、ワード線電極となる各アモルファスシリコン膜へのワード線駆動回路等の接続については、ビアホールを立体的に形成することとなる。しかし、上述したように複数のメモリセル層が3次元的に積層されているため、それぞれのメモリセル層にビアホールを形成する場合、従来技術においては、次のような問題が生じる。即ち、第1に前記ビアホールが形成されるそれぞれのメモリセル層の端部が、垂直方向で重ならないように加工する必要が生じる点である。更に、前記加工を施す場合、前記それぞれのビアホールは、異なる高さ(深さ)まで加工する必要生じる場合もある。また第2に、積層するメモリセル層の数によっては、それぞれのビアホールを同一の加工工程で形成することが困難となり、それぞれのビアホールを個別の加工工程で形成する必要が生じる点である。この場合、加工工程の増加に伴い製造コストの上昇を招く問題も生じる。
上述した本発明の第1の実施形態に係る不揮発性半導体記憶装置においては、積層されるアモルファスシリコン膜、酸化珪素膜及び窒化珪素膜は、ビット線に直交する方向の端部が、基板に対して上方に折り曲げられて形成され、CMP処理等によって平坦化される。従って、上述したように、前記それぞれの膜の端部の端面上にワード線駆動回路を接続するためのビアホールを同一の加工工程で形成することが容易である。
7:ワード線WL
10:メモリストリングス
126:ポリシリコン膜
128:窒化珪素膜
132a、132c:熱酸化膜
136:柱状のアモルファスシリコン層(第1の柱状半導体)
149:酸化珪素膜
150、154、158、162:アモルファスシリコン膜
152、156、160、164:酸化珪素膜
168:窒化珪素膜
169:塗布型低誘電率層間絶縁膜SOG
172:ONO膜
180:柱状のアモルファスシリコン層(第2の柱状半導体)
184:アモルファスシリコン膜
187:酸化珪素膜
188a、188b、188c、188d、188e、188f、188g:タングステンプラグ
400a、400b、400c、400d、400e、400f、400g:ビアホール
Claims (5)
- 基板と、
前記基板に対して垂直に形成された柱状半導体と、前記柱状半導体の周りに形成された第1の絶縁膜と、前記第1の絶縁膜の周りに形成された電荷蓄積層と、前記電荷蓄積層の周りに形成された第2の絶縁膜と、前記第2の絶縁膜の周りに形成された導電体層とを有する電気的に書き換え可能なメモリセルが直列に接続されたメモリストリングスと、
前記導電体層と駆動回路とを接続するコンタクトとを備え、
前記導電体層の端部は前記基板に対して上方に折り曲げられ、且つ折り曲げられた前記導電体層の各端面上に前記コンタクトが設けられていることを特徴とする不揮発性半導体記憶装置。 - 前記導電体層の前記端面の幅は、前記導電体層の厚さ以上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。
- 前記導電体層の端面は、同一平面上に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。
- 前記導電体層の端部は、前記基板に対して斜めに折り曲げられてい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。
- 半導体基板上に第1の絶縁膜を形成し、
前記第1の絶縁膜を所定の角度をもって開口し、
前記第1の絶縁膜上に導電体膜と第2の絶縁膜とを交互に、且つ前記開口側壁にも沿って折れ曲がるように形成し、
前記第2の絶縁膜、導電体膜を平坦化し、
露出した前記導電体膜の端面上に駆動回路と接続するビアホールを形成することを特徴とする不揮発性半導体記憶装置の製造方法。
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006283117A JP5100080B2 (ja) | 2006-10-17 | 2006-10-17 | 不揮発性半導体記憶装置及びその製造方法 |
US11/874,004 US7952136B2 (en) | 2006-10-17 | 2007-10-17 | Nonvolatile semiconductor storage apparatus and method for manufacturing the same |
TW096138931A TWI355071B (en) | 2006-10-17 | 2007-10-17 | Nonvolatile semiconductor storage apparatus and me |
CNB2007101930008A CN100573888C (zh) | 2006-10-17 | 2007-10-17 | 非易失性半导体存储装置及其制造方法 |
KR1020070104665A KR100938514B1 (ko) | 2006-10-17 | 2007-10-17 | 불휘발성 반도체 기억 장치 및 그 제조 방법 |
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US7952136B2 (en) | 2011-05-31 |
CN101165909A (zh) | 2008-04-23 |
CN100573888C (zh) | 2009-12-23 |
TWI355071B (en) | 2011-12-21 |
US8318602B2 (en) | 2012-11-27 |
US20080099819A1 (en) | 2008-05-01 |
TW200828577A (en) | 2008-07-01 |
KR100938514B1 (ko) | 2010-01-25 |
JP5100080B2 (ja) | 2012-12-19 |
KR20090038412A (ko) | 2009-04-20 |
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KR20080034816A (ko) | 2008-04-22 |
US20110189853A1 (en) | 2011-08-04 |
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