JP2008131030A - トンネル障壁の上に電界分布層を有する電荷捕獲装置 - Google Patents
トンネル障壁の上に電界分布層を有する電荷捕獲装置 Download PDFInfo
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Abstract
【解決手段】ソース領域及びドレイン領域を有する表面を有し、前記ソース領域及び前記ドレイン領域がチャネル領域によって分離された半導体基板と、前記チャネル領域の上の前記基板の表面上に配置された3nmを超える実質的なゲート絶縁膜厚を有するトンネル障壁絶縁体構造105、前記トンネル障壁絶縁体構造及び前記チャネル領域の上に配置された導電層101、前記導電層及び前記チャネル領域の上に配置された電子捕獲構造106、並びに前記電子捕獲構造及び前記チャネル領域の上に配置された上側絶縁体構造107を有する、前記チャネル上の多層スタックと、前記上側絶縁体構造及び前記チャネル領域の上に配置された上側導電層108とを具える。
【選択図】図7
Description
Claims (27)
- ソース領域及びドレイン領域を有する表面を有し、前記ソース領域及び前記ドレイン領域がチャネル領域によって分離された半導体基板と、
前記チャネル領域の上の前記基板の表面上に配置された3nmを超える実質的なゲート絶縁膜厚を有するトンネル障壁絶縁体構造、前記トンネル障壁絶縁体構造及び前記チャネル領域の上に配置された導電層、前記導電層及び前記チャネル領域の上に配置された電子捕獲構造、並びに前記電子捕獲構造及び前記チャネル領域の上に配置された上側絶縁体構造を有する、前記チャネル上の多層スタックと、
前記上側絶縁体構造及び前記チャネル領域の上に配置された上側導電層とを具えるメモリセル。 - 請求項1記載のメモリセルにおいて、前記チャネル領域が、ソース−ドレイン間の長さ及び45nm未満の長さに垂直な幅を有することを特徴とするメモリセル。
- 請求項1記載のメモリセルにおいて、前記多層スタックが実質的なゲート絶縁膜厚を有し、前記チャネル領域が、ソース−ドレイン間の長さ及び前記多層スタックの実質的なゲート絶縁膜厚保の1.5倍未満の長さに垂直な幅を有することを特徴とするメモリセル。
- 請求項1記載のメモリセルにおいて、前記チャネル領域が、ソース−ドレイン間の長さ及び前記長さに垂直な幅を有する有効エリアを有し、前記導電層が、前記チャネル領域の有効エリアの幅にほぼ等しい幅を有することを特徴とするメモリセル。
- 請求項1記載のメモリセルにおいて、前記トンネル障壁絶縁体構造が酸化シリコンを含むことを特徴とするメモリセル。
- 請求項1記載のメモリセルにおいて、前記トンネル障壁絶縁体構造が窒化シリコンを含むことを特徴とするメモリセル。
- 請求項1記載のメモリセルにおいて、前記トンネル障壁絶縁体構造が、バンドギャップ操作されたトンネル障壁構造を具えることを特徴とするメモリセル。
- 請求項1記載のメモリセルにおいて、前記導電層が、ドープされた半導体材料を含むことを特徴とするメモリセル。
- 請求項1記載のメモリセルにおいて、前記導電層が、6nm未満の厚さを有するドープされたポリシリコンを含むことを特徴とするメモリセル。
- 請求項1記載のメモリセルにおいて、前記導電層が金属を含むことを特徴とするメモリセル。
- 請求項1記載のメモリセルにおいて、前記電荷捕獲構造が窒化シリコンを含むことを特徴とするメモリセル。
- 請求項1記載のメモリセルにおいて、前記電荷捕獲構造が、酸化シリコン層と、前記酸化シリコン層の上に配置された窒化シリコン層とを具えることを特徴とするメモリセル。
- 半導体基板上のメモリセルのアレイと、
前記基板においてチャネル領域によって分離されるソース領域及びドレイン領域と、前記チャネル領域の上に配置された3μmを超える実質的なゲート酸化膜厚を有するトンネル障壁絶縁体構造と、前記トンネル障壁絶縁体構造及び前記チャネル領域の上に配置された導電層と、前記導電層及び前記チャネル領域の上に配置された電荷捕獲構造と、前記電荷捕獲構造の上に配置された上側絶縁体構造と、前記上側絶縁体構造及び前記チャネル領域の上に配置された上側導電層とを具えるメモリセルと、
行デコーダと、
列デコーダと、
センス増幅器と、
少なくとも一つの入力ポートと、
少なくとも一つの出力ポートと、
データイン構造と、
バイアス配置状態マシンとを具える記憶装置。 - 半導体基板の表面上に3nmを超える実質的なゲート酸化膜厚を有するトンネル障壁絶縁体構造を形成し、前記トンネル障壁絶縁体構造の上に導電層を形成し、前記導電層の上に電荷捕獲構造を形成し、前記電荷捕獲構造の上に上側絶縁体構造を形成し、前記上側絶縁体構造の上に上側導電層を形成し、
前記半導体基板の表面にドーパントを注入してソース領域及びドレイン領域を形成して、前記チャネル領域を分離するとともに、前記チャネル領域を前記トンネル障壁絶縁体構造より下にする、メモリセルの製造方法。 - 請求項14記載の方法において、複数のメモリセルを具えるメモリセルを形成することを特徴とするメモリセルの製造方法。
- 請求項14記載の方法において、前記トンネル障壁絶縁体構造が、3〜6nmの範囲の厚さを有する酸化シリコンを含むことを特徴とするメモリセルの製造方法。
- 請求項14記載の方法において、前記トンネル障壁絶縁体構造の形成が、複数の絶縁体層を形成することによるバンドギャップ操作されたトンネル障壁構造の形成を具えることを特徴とするメモリセルの製造方法。
- 請求項14記載の方法において、前記導電層が、6nm未満の厚さを有するポリシリコンを含むことを特徴とするメモリセルの製造方法。
- 請求項14記載の方法において、前記電子捕獲構造が、4〜8nmの範囲の厚さを有する窒化シリコンを含むことを特徴とするメモリセルの製造方法。
- 請求項14記載の方法において、前記トンネル絶縁体構造の形成が、絶縁体層の形成及び前記絶縁体層上の電子捕獲層の形成を具えることを特徴とするメモリセルの製造方法。
- 請求項14記載の方法において、前記上側絶縁体構造が、5〜9nmの範囲の厚さを有する酸化シリコンを含むことを特徴とするメモリセルの製造方法。
- 請求項14記載の方法において、前記上側導電層が、約50nmの厚さを有するポリシリコンを含むことを特徴とするメモリセルの製造方法。
- 3nm未満の大きさの実質的なゲート酸化膜厚を有するトンネル障壁絶縁体構造を半導体基板の表面上に形成し、前記トンネル障壁絶縁体構造の上に導電層を形成し、前記導電層の上に電荷捕獲構造を形成し、前記電子捕獲構造の上に上側絶縁体構造を形成し、前記上側絶縁体構造の上に上側導電層を形成し、前記上側導電層の上にハードマスク層を形成し、
全ての層及び全ての構造を貫く複数のメモリセル間並びに基板に絶縁材料の複数の絶縁構造を形成し、
前記ハードマスク層を剥離し、
前記トンネル障壁絶縁体構造並びに前記トンネル障壁絶縁体構造の上に配置された全ての層及び全ての構造をエッチングすることによってメモリセルの複数の行を形成し、
前記半導体基板の表面にドーパントを注入することによってソース領域及びドレイン領域を形成して、前記ソース領域及び前記ドレイン領域の対をメモリセルチャネル領域によって分離するとともに、前記チャネル領域を前記トンネル障壁絶縁体構造より下にすることを特徴とするメモリセルのアレイの製造方法。 - 請求項23記載のメモリセルのアレイの製造方法において、前記ハードマスク層が、約100nmの厚さを有する窒化シリコンを含むことを特徴とするメモリセルのアレイの製造方法。
- 請求項23記載のメモリセルのアレイの製造方法において、絶縁材料の分離構造が酸化シリコンを含むことを特徴とするメモリセルのアレイの製造方法。
- 請求項23記載のメモリセルのアレイの製造方法において、複数の分離構造の形成による余分な酸化物の除去が化学機械研磨を含むことを特徴とするメモリセルのアレイの製造方法。
- 請求項23記載のメモリセルのアレイの製造方法において、前記ハードマスク層の剥離後の前記上側導電層からの酸化物の除去が、湿式のフッ化水素溶液の浸漬エッチングを具えることを特徴とするメモリセルのアレイの製造方法。
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US8101989B2 (en) | 2012-01-24 |
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