JP2010161132A - 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】メモリストリングMSは、基板Baに対して垂直方向に延びる一対の柱状部38a、及び一対の柱状部38aの下端を連結させるように形成された連結部38bを有するU字状半導体層38と、U字状半導体層38の側面を取り囲むように形成された電荷蓄積層37bと、電荷蓄積層27bの側面を取り囲むように形成された第1〜第4ワード線導電層32a〜32dとを備える。柱状部38aは、カラム方向に第1ピッチ3Fをもって整列し、且つロウ方向に第2ピッチ2Fcosθをもって千鳥状に配列され、第1〜第4ワード線導電層32a〜32dは、カラム方向に第1ピッチ3Fをもって配列され、ロウ方向においては柱状部38aの千鳥状の配列に沿って波状に曲がりながら延びるように構成されている。
【選択図】図6A
Description
図1は、本発明の実施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、実施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、ソース側選択ゲート線(SGS)駆動回路14、ドレイン側選択ゲート線(SGD)駆動回路15、センスアンプ16、ソース線駆動回路17、及びバックゲートトランジスタ駆動回路18を有する。メモリトランジスタ領域12は、データを記憶するメモリトランジスタを有する。ワード線駆動回路13は、ワード線WLに印加する電圧を制御する。ソース側選択ゲート線(SGS)駆動回路14は、ソース側選択ゲート線SGSに印加する電圧を制御する。ドレイン側選択ゲート線(SGD)駆動回路15は、ドレイン側選択ゲート線SGDに印加する電圧を制御する。センスアンプ16は、メモリトランジスタから読み出した電位を増幅する。ソース線駆動回路17は、ソース線SLに印加する電圧を制御する。バックゲートトランジスタ駆動回路18は、バックゲート線BGに印加する電圧を制御する。なお、上記の他、実施形態に係る不揮発性半導体記憶装置100は、ビット線BLに印加する電圧を制御するビット線駆動回路を有する(図示略)。
次に、図7〜図26を参照して、実施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。図7、図8、図10、図12、図13、図15、図16、図18、図19、及び図21〜図26は、実施形態に係る不揮発性半導体記憶装置100の製造工程を示す断面図である。図9、図11、図14、図17、及び図20は、実施形態に係る不揮発性半導体記憶装置100の製造工程を示す上面図である。
次に、実施形態に係る不揮発性半導体記憶装置100の効果について、比較例と比較して説明する。比較例において、柱状部38aは、ロウ方向及びカラム方向にマトリクス状に配置され、第1〜第4ワード線導電層32a〜32dは、カラム方向に所定ピッチ3Fをもってロウ方向に延びるストライプ状に構成されているものとする。このような比較例において、柱状部38aの配置されるカラム方向のピッチは、「2F」となる。
以上、不揮発性半導体記憶装置の一実施形態を説明してきたが、本発明は、上記実施形態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種々の変更、追加、置換等が可能である。
Claims (5)
- 電気的に書き換え可能な複数のメモリセルが直列に接続された複数のメモリストリング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は、
基板に対して垂直方向に延びる一対の柱状部、及び前記一対の柱状部の下端を連結させるように形成された連結部を有する第1半導体層と、
前記第1半導体層の側面を取り囲むように形成された電荷蓄積層と、
前記電荷蓄積層の側面を取り囲むように形成され、前記メモリセルの制御電極として機能する第1導電層とを備え、
前記柱状部は、前記垂直方向に直交する第1方向に第1ピッチをもって整列し、且つ前記垂直方向及び前記第1方向に直交する第2方向に第2ピッチをもって千鳥状に配列され、
前記第1導電層は、前記第1方向に前記第1ピッチをもって配列され、前記第2方向においては前記千鳥状の配列に沿って波状に曲がりながら延びるように構成されている
ことを特徴とする不揮発性半導体記憶装置。 - 3つの前記柱状部の中心を結び構成される三角形のうち、3辺の和が最も小さい三角形が二等辺三角形となるよう、前記柱状部が配列された
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。 - 前記第1ピッチは、3Fであり、
前記第2ピッチは、2F未満である
ことを特徴とする請求項1又は請求項2記載の不揮発性半導体記憶装置。 - 前記メモリストリングの一端に接続され導通を制御する選択トランジスタを備え、
前記選択トランジスタは、
前記柱状部の上面から前記垂直方向に延びる第2半導体層と、
前記第2半導体層の側面を取り囲むように形成された絶縁層と、
前記絶縁層の側面を取り囲むように形成され、前記選択トランジスタの制御電極として機能する第2導電層とを備え、
前記第2半導体層は、前記垂直方向に直交する第1方向に前記第1ピッチをもって整列し、且つ前記第2方向に前記第2ピッチをもって千鳥状に配列され、
前記第2導電層は、前記第1方向に前記第1ピッチをもって配列され、前記第2方向においては前記千鳥状の配列に沿って波状に曲がりながら延びるように構成されている
ことを特徴とする請求項1乃至請求項3のいずれか1項記載の不揮発性半導体記憶装置。 - 電気的に書き換え可能な複数のメモリセルが直列に接続された複数のメモリストリングを有する不揮発性半導体記憶装置の製造方法であって、
絶縁層に挟まれた複数の導電層を堆積させる工程と、
複数の前記導電層、及び前記絶縁層を基板と平行な方向からみてU字状に貫いてホールを形成する工程と、
前記ホールに面する前記複数の導電層の側面側に電荷蓄積層を形成する工程と、
前記ホールを埋めるように半導体層を形成する工程と、
前記導電層、及び前記絶縁層を貫通するように溝を形成する工程とを備え、
前記ホールは、前記基板と平行な第1方向に第1ピッチをもって整列し、且つ前記基板と平行であって前記第1方向に直交する第2方向に第2ピッチをもって千鳥状に配列されるように形成され、
前記溝は、前記第1方向に前記第1ピッチをもって位置し、前記第2方向においては前記千鳥状の配列に沿って波状に曲がりながら延びるように形成される
ことを特徴とする不揮発性半導体記憶装置の製造方法。
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Also Published As
Publication number | Publication date |
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US8154068B2 (en) | 2012-04-10 |
TWI397170B (zh) | 2013-05-21 |
KR20100081943A (ko) | 2010-07-15 |
KR101076184B1 (ko) | 2011-10-21 |
TW201029157A (en) | 2010-08-01 |
US20100171162A1 (en) | 2010-07-08 |
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