JP4691124B2 - 不揮発性半導体記憶装置の製造方法 - Google Patents
不揮発性半導体記憶装置の製造方法 Download PDFInfo
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- H10B41/20—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates characterised by three-dimensional arrangements, e.g. with cells on different height levels
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
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- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
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- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/28—Manufacture of electrodes on semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/268
- H01L21/28008—Making conductor-insulator-semiconductor electrodes
- H01L21/28017—Making conductor-insulator-semiconductor electrodes the insulator being formed after the semiconductor body, the semiconductor being silicon
- H01L21/28026—Making conductor-insulator-semiconductor electrodes the insulator being formed after the semiconductor body, the semiconductor being silicon characterised by the conductor
- H01L21/28035—Making conductor-insulator-semiconductor electrodes the insulator being formed after the semiconductor body, the semiconductor being silicon characterised by the conductor the final conductor layer next to the insulator being silicon, e.g. polysilicon, with or without impurities
- H01L21/28044—Making conductor-insulator-semiconductor electrodes the insulator being formed after the semiconductor body, the semiconductor being silicon characterised by the conductor the final conductor layer next to the insulator being silicon, e.g. polysilicon, with or without impurities the conductor comprising at least another non-silicon conductive layer
- H01L21/28052—Making conductor-insulator-semiconductor electrodes the insulator being formed after the semiconductor body, the semiconductor being silicon characterised by the conductor the final conductor layer next to the insulator being silicon, e.g. polysilicon, with or without impurities the conductor comprising at least another non-silicon conductive layer the conductor comprising a silicide layer formed by the silicidation reaction of silicon with a metal layer
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- H10B41/23—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates characterised by three-dimensional 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 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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Description
図1は、本発明の一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、一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にかける電圧を制御する。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にかける電圧を制御する。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にかける電圧を制御する。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。なお、上記の他、一実施形態に係る不揮発性半導体記憶装置10は、ビット線BLにかける電圧を制御するビット線駆動回路、ソース線SLにかける電圧を制御するソース線駆動回路を有する(図示略)。
次に、図4、及び図5を参照して、不揮発性半導体記憶装置100の更に具体的構成を説明する。図4は、カラム方向の断面構造図であり、図5は、カラム方向に直交するロウ方向の断面構造図である。図4及び図5に示すように、不揮発性半導体記憶装置100は、半導体基板Ba上にメモリセルブロックMCB0,MCB1を有する。各メモリセルブロックMCB0,MCB1は、上述した複数のメモリストリングスMSを有する。メモリセルブロックMCB0,MCB1間には、層間絶縁層50が形成されている。
次に、図6〜図30を参照して、一実施形態に係る不揮発性半導体記憶装置100の製造工程の一例について説明する。
次に、一実施形態に係る不揮発性半導体記憶装置100の効果について説明する。上記の一実施形態に係る不揮発性半導体記憶装置100は、上記積層構造に示したように高集積化可能である。また、不揮発性半導体記憶装置100は、上記製造工程にて説明したように、メモリトランジスタMTrnmとなる各層、及びソース側選択トランジスタSSTrnm,ドレイン側選択トランジスタSDTrnmとなる各層を、積層数に関係なく所定のリソグラフィー工程数で製造することができる。すなわち、安価に不揮発性半導体記憶装置100を製造することが可能である。
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スを有する不揮発性半導体記憶装置の製造方法であって、
犠牲層と前記メモリセルのゲートとして機能する導電体とを交互に複数積層する工程と、
前記犠牲層と前記導電体とを貫通させてホールを形成する工程と、
前記ホールの表面から順次、絶縁層にて囲まれた電荷蓄積層、及び前記メモリセルのボディとして機能する柱状半導体を形成する工程と、
複数層の前記導電体と複数層の前記犠牲層の端部が階段状となるように、複数層の前記導電体及び複数層の前記犠牲層を加工する工程と、
酸性の薬液を用いて前記犠牲層を除去する一方、複数層の前記導電体を支えるように前記柱状半導体を残存させる工程と
を備え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。 - 前記犠牲層を除去した後、前記導電体の表面をシリサイド化する
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の製造方法。 - 前記犠牲層を除去することで複数層の前記導電体の上下間に形成された空隙の少なくとも一部を埋めるように、複数層の前記導電体の上下間に絶縁性の流動体を充填する
ことを特徴とする請求項1又は請求項2のいずれか1項記載の不揮発性半導体記憶装置の製造方法。 - 前記流動体は、酸化シリコンの誘電率よりも低い誘電率を有する
ことを特徴とする請求項3記載の不揮発性半導体記憶装置の製造方法。 - 前記犠牲層は、シリコンゲルマニウム、又は窒化シリコンにて構成される
ことを特徴とする請求項1乃至請求項4のいずれか1項記載の不揮発性半導体記憶装置の製造方法。
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JP2008065882A JP4691124B2 (ja) | 2008-03-14 | 2008-03-14 | 不揮発性半導体記憶装置の製造方法 |
US12/403,919 US7847334B2 (en) | 2008-03-14 | 2009-03-13 | Non-volatile semiconductor storage device and method of manufacturing the same |
KR1020090021543A KR101126868B1 (ko) | 2008-03-14 | 2009-03-13 | 불휘발성 반도체 기억 장치, 및 그 제조 방법 |
US12/908,546 US7927926B2 (en) | 2008-03-14 | 2010-10-20 | Non-volatile semiconductor storage device and method of manufacturing the same |
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US11309325B2 (en) | 2015-03-12 | 2022-04-19 | Kioxia Corporation | Nonvolatile semiconductor memory device and method of manufacturing the same |
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US20090242967A1 (en) | 2009-10-01 |
KR20090098733A (ko) | 2009-09-17 |
KR101126868B1 (ko) | 2012-03-23 |
US7927926B2 (en) | 2011-04-19 |
US7847334B2 (en) | 2010-12-07 |
US20110033995A1 (en) | 2011-02-10 |
JP2009224465A (ja) | 2009-10-01 |
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