JP2015070266A - 不揮発性メモリセルの形成方法及びその構造 - Google Patents
不揮発性メモリセルの形成方法及びその構造 Download PDFInfo
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- G11C16/0408—Erasable programmable read-only memories electrically programmable using variable threshold transistors, e.g. FAMOS comprising cells containing floating gate transistors
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Abstract
Description
Claims (24)
- 基板上に形成されたウェルと、
前記ウェル上に形成された複数のソース/ドレインドープ領域と、
前記ウェル上の前記複数のソース/ドレインドープ領域の第1ソース/ドレインドープ領域と第2ソース/ドレインドープ領域との間に形成された第1下部誘電体層と、
前記ウェル上の前記複数のソース/ドレインドープ領域の第2ソース/ドレインドープ領域と第3ソース/ドレインドープ領域との間に形成された第2下部誘電体層と、
前記第1下部誘電体層上に形成された第1電荷トラップ層と、
前記第2下部誘電体層上に形成された第2電荷トラップ層と、
前記第1電荷トラップ層上に形成されたブロック層と、
前記ブロック層上に形成されたメモリゲートと、
前記第2電荷トラップ層上に形成された選択ゲートと、
を含む不揮発性メモリセル。 - 活性領域を画定するために前記基板上に形成された複数の絶縁体を更に含む、請求項1に記載の不揮発性メモリセル。
- 前記ウェル上に形成され、対応する下部誘電体層と対応するソース/ドレインドープ領域との間にそれぞれ形成される複数の低濃度ドープ領域を更に含む、請求項1に記載の不揮発性メモリセル。
- 前記基板と前記ウェルとの間に形成されたディープウェルを更に含む、請求項1に記載の不揮発性メモリセル。
- 前記ディープウェルはディープNウェルである、請求項4に記載の不揮発性メモリセル。
- 前記基板と前記ウェルとの間に形成された障壁層を更に含む、請求項1に記載の不揮発性メモリセル。
- 前記障壁層はN障壁層である、請求項6に記載の不揮発性メモリセル。
- 前記選択ゲートの長さはメモリゲートの長さよりも長い、あるいは等しい、請求項1に記載の不揮発性メモリセル。
- 前記第1電荷トラップ層及び前記第2電荷トラップ層は窒化ケイ素で形成される、請求項1に記載の不揮発性メモリセル。
- 前記第1電荷トラップ層及び前記第2電荷トラップ層は酸窒化ケイ素で形成される、請求項1に記載の不揮発性メモリセル。
- 前記基板はP型基板で、前記ウェルはNウェルで、前記複数のソース/ドレインドープ領域はP+ドープ領域である、請求項1に記載の不揮発性メモリセル。
- 選択トランジスタ領域及び蓄積トランジスタ領域を有する活性領域を画定する工程と、
基板上にウェルを形成する工程と、
下部誘電体層、電荷トラップ層及び上部誘電体層を有する積層を形成する工程と、
前記上部誘電体層を前記選択トランジスタ領域でエッチングする工程と、
前記選択トランジスタ領域上に選択ゲートを形成し、前記蓄積トランジスタ領域上にメモリゲートを形成する工程と、
複数のソース/ドレインドープ領域を形成する工程と、
を含む不揮発性メモリセルの形成方法。 - 複数の低濃度ドープ領域を形成する工程を更に含む、請求項12に記載の方法。
- 前記活性領域を画定する前記の工程は前記基板上に絶縁体を形成する工程を含む、請求項12に記載の方法。
- 前記ウェルを形成する前記の工程は前記基板に不純物を注入する工程を含む、請求項12に記載の方法。
- 前記複数の低濃度ドープ領域を形成する前記の工程は、前記ウェルにイオンを注入して4つの低濃度ドープ領域を前記ウェル上に形成し、対応する下部誘電体層と対応するソース/ドレインドープ領域との間にそれぞれ形成される工程を含む、請求項12に記載の方法。
- 前記基板に不純物を注入して、ディープウェルを前記基板と前記ウェルとの間に形成する工程を更に含む、請求項12に記載の方法。
- 前記ディープウェルはディープNウェルである、請求項17に記載の方法。
- 前記基板に不純物を注入して、障壁層を前記基板と前記ウェルとの間に形成する工程を更に含む、請求項12に記載の方法。
- 前記障壁層はN障壁層である、請求項19に記載の方法。
- 前記選択ゲートの長さは前記メモリゲートの長さよりも長い、あるいは等しい、請求項12に記載の方法。
- 前記第1電荷トラップ層及び前記第2電荷トラップ層は窒化ケイ素で形成される、請求項12に記載の方法。
- 前記第1電荷トラップ層及び前記第2電荷トラップ層は酸窒化ケイ素で形成される、請求項12に記載の方法。
- 前記基板はP型基板で、前記ウェルはNウェルで、前記ソース/ドレインドープ領域はP+ドープ領域である、請求項12に記載の方法。
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