JP5514004B2 - 半導体記憶装置及びその製造方法 - Google Patents
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- H01L29/66477—Unipolar field-effect transistors with an insulated gate, i.e. MISFET
- H01L29/66666—Vertical transistors
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- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/66007—Multistep manufacturing processes
- H01L29/66075—Multistep manufacturing processes of devices having semiconductor bodies comprising group 14 or group 13/15 materials
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- H01L29/66409—Unipolar field-effect transistors
- H01L29/66477—Unipolar field-effect transistors with an insulated gate, i.e. MISFET
- H01L29/66833—Unipolar field-effect transistors with an insulated gate, i.e. MISFET with a charge trapping gate insulator, e.g. MNOS transistors
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- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
- H01L29/792—Field effect transistors with field effect produced by an insulated gate with charge trapping gate insulator, e.g. MNOS-memory transistors
- H01L29/7926—Vertical transistors, i.e. transistors having source and drain not in the same horizontal plane
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Description
図1は、本発明の第1の実施形態に係わる不揮発性半導体記憶装置の素子構造を示す断面図である。
次に、前記図1の不揮発性半導体記憶装置の別の製造方法を説明する。
次に、図5を参照して、前記図1の不揮発性半導体記憶装置の更に別の製造方法を説明する。
なお、本発明は上述した各実施形態に限定されるものではない。実施形態では、セル用トレンチを円形にしたが、必ずしも円形に限らず楕円形であっても良いし、矩形にすることも可能である。さらに、素子分離用トレンチは、必ずしもセル用トレンチの両側にある必要はなく、少なくとも一方側にあればよい。
12…シリコン窒化膜
13…フォトレジスト膜
15…セル用トレンチ
17…素子分離用トレンチ
20(21,22,23)…層間絶縁膜
30(31,32,33)…制御ゲート電極層
40…ブロック絶縁膜
50…電荷蓄積層
60…トンネル絶縁膜
70…シリコン層
80(81,82.83)…層間絶縁膜
Claims (10)
- シリコン基板上に柱状に形成されたシリコン層と、
前記シリコン層の側壁面を囲むようにトンネル絶縁膜,電荷蓄積層,及びブロック絶縁膜が形成されたゲート絶縁膜部と、
前記ゲート絶縁膜部の側壁面を囲むように形成され、且つ前記基板上に複数の層間絶縁膜と複数の制御ゲート電極層が交互に積層された積層構造部と、
を有し、前記シリコン層,トンネル絶縁膜,電荷蓄積層,ブロック絶縁膜,及び制御ゲート電極層からなる縦型トランジスタでメモリセルを構成した半導体記憶装置であって、
前記シリコン層と前記制御ゲート電極層との間に、前記トンネル絶縁膜,前記電荷蓄積層,及び前記ブロック絶縁膜が配置され、
前記シリコン層と前記層間絶縁膜との間に、前記トンネル絶縁膜,前記電荷蓄積層よりもトラップ準位の低い領域を有する膜,及び前記ブロック絶縁膜が配置されていることを特徴とする半導体記憶装置。 - 前記電荷蓄積層はシリコン窒化膜であり、前記トンネル絶縁膜及び前記ブロック絶縁膜はシリコン酸化膜を含む膜であり、前記トラップ準位の低い領域を有する膜は酸窒化膜を含む膜であり、
前記トラップ準位の低い領域を有する膜は、前記電荷蓄積層よりも窒素濃度が低い領域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。 - 前記シリコン層は一方向及びこれと交差する方向に二次元配置され、前記シリコン層に隣接して前記積層構造部に、前記一方向に隣接するメモリセルを分離する素子分離用トレンチが形成されていることを特徴とする請求項1記載の半導体記憶装置。
- シリコン基板上に、複数の層間絶縁膜と複数の制御ゲート電極層とを交互に積層した積層構造部を形成する工程と、
前記積層構造部に、前記基板の表面に対し垂直方向に沿ってセル用トレンチを形成する工程と、
前記セル用トレンチの側壁に沿って、ブロック絶縁膜,電荷蓄積層,及びトンネル絶縁膜を上記順に形成する工程と、
前記セル用トレンチ内に、前記トンネル絶縁膜に接してシリコン層を埋め込み形成する工程と、
前記セル用トレンチの近傍で前記制御ゲート電極層及び前記層間絶縁膜に素子分離用トレンチを形成した後、酸化性雰囲気で熱処理することによって、前記電荷蓄積層の前記層間絶縁膜に対向する部分を酸化する工程と、
を含むことを特徴とする半導体記憶装置の製造方法。 - 前記層間絶縁膜として、CVD法によるシリコン酸化膜、又はポリシラザンの塗布膜を用いたことを特徴とする請求項4記載の半導体記憶装置の製造方法。
- 前記電荷蓄積層を酸化するための酸化性雰囲気での熱処理として、水蒸気酸化を行うことを特徴とする請求項4又は5に記載の半導体記憶装置の製造方法。
- シリコン基板上に、複数の層間絶縁膜と複数の制御ゲート電極層を交互に積層した積層構造部を形成する工程と、
前記積層構造部に、前記基板の表面に対し垂直方向に沿ってセル用トレンチを形成する工程と、
前記セル用トレンチの側壁に沿って、ブロック絶縁膜,電荷蓄積層,及びトンネル絶縁膜を上記順に形成する工程と、
前記セル用トレンチ内に、前記トンネル絶縁膜に接してシリコン層を埋め込み形成する工程と、
前記セル用トレンチの近傍で前記制御ゲート電極層及び前記層間絶縁膜に素子分離用トレンチを形成した後、水洗処理を施すことによって前記層間絶縁膜に水分を含浸させる工程と、
前記層間絶縁膜への水分の含浸工程後に熱処理を施すことによって、前記電荷蓄積層の前記層間絶縁膜に対向する部分を酸化する工程と、
を含むことを特徴とする半導体記憶装置の製造方法。 - 前記層間絶縁膜として、シリコン酸化膜、又は吸湿性の高いLaOx,BSG,BPSG,FSGを用いることを特徴とする請求項7記載の半導体記憶装置の製造方法。
- シリコン基板上に、複数の層間絶縁膜と複数の制御ゲート電極層を交互に積層した積層構造部を形成する工程と、
前記積層構造部に、前記基板の表面に対し垂直方向に沿ってセル用トレンチを形成する工程と、
前記セル用トレンチの側壁に沿って、ブロック絶縁膜,電荷蓄積層,及びトンネル絶縁膜を上記順に形成する工程と、
前記セル用トレンチ内に、前記トンネル絶縁膜に接してシリコン層を埋め込み形成する工程と、
前記セル用トレンチの近傍で前記制御ゲート電極層及び前記層間絶縁膜に素子分離用トレンチを形成した後、前記制御ゲート電極層をマスクに前記層間絶縁膜,前記ブロック絶縁膜,前記電荷蓄積層,及び前記トンネル絶縁膜をエッチングすることにより、前記電荷蓄積層を前記基板の表面に対し垂直方向に分離する工程と、
前記層間絶縁膜,前記ブロック絶縁膜,前記電荷蓄積層,及び前記トンネル絶縁膜をエッチングした部分に新たに層間絶縁膜を埋め込み形成する工程と、
を含むことを特徴とする半導体記憶装置の製造方法。 - 前記セル用トレンチを一方向及びこれと交差する方向にマトリックス状に形成し、前記素子分離用トレンチを前記一方向に隣接する前記セル用トレンチ間に形成することを特徴とする請求項4乃至9の何れかに記載の半導体記憶装置の製造方法。
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US8587049B2 (en) * | 2006-07-17 | 2013-11-19 | Spansion, Llc | Memory cell system with charge trap |
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