JP2009500845A - ReRAM用多層二元酸化膜の形成方法 - Google Patents
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- 229910045601 alloy Inorganic materials 0.000 claims description 6
- 239000000956 alloy Substances 0.000 claims description 6
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- 230000015572 biosynthetic process Effects 0.000 claims description 4
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- 229910052759 nickel Inorganic materials 0.000 claims description 4
- 229910052709 silver Inorganic materials 0.000 claims description 4
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Abstract
上記金属膜の形成段膜と上記酸化する段階を繰り返して所望の厚さの多層薄膜を形成する段階と、上記多層薄膜上に上部電極膜を形成する段階とを含む。本発明によれば、真空状態で金属膜の形成と酸化工程を行うため、工程が簡単で表面汚染の恐れが無く従来のペロブスカイト系より優れた高効率の非揮発性メモリ素子を実現できる。
Description
この障壁層の上にイリジウムを蒸着する段階、
イリジウム層上にPCMO層(Pr0.7Ca0.3MnO3)をスピンコーティングする段階、
前記PCMO層と基板を3段階ベーキングプロセスに従いベーキングする段階、
前記基板及びPCMO層をRTF室内でベーキング後にアニーリングを行う段階、
前記PCMO層が所望の厚さになるまで前記スピンコーティング、ベーキング及びアニーリングを繰り返す段階、
前記基板及びPCMO層をアニーリングする段階、
最後に上部電極を蒸着しパターン化してReRAM装置を完成する工程を提供するものである。
(i)基板上に下部電極層を形成する段階と、
(ii)真空の雰囲気で前記下部電極層上に金属層を形成する段階と、
(iii)真空の雰囲気で前記金属層を二元酸化膜に酸化させる段階と、
(iv)前記(ii)と(iii)の段階を繰り返して所望の厚さの多層二元酸化膜を形成する段階と、
(v)前記多層二元酸化膜上に上部電極層を形成する段階と、を含んで成る。
先ず、基板11を用意する(図1a)。
基板11は、通常の半導体メモリ素子に適用できるものであれば可能で、特に制限されるものではない。
その代表的な例がSi基板で、二酸化シリコン基板、ポリシリコン基板なども含まれる。
前記電極層12は、Pt、Au、Al、Cu、Tiとこれらの合金で構成されるグループから選ばれた1種が適用でき、これに限定されるものではない。電極層の厚さは、電極物質の種類によって約5〜500nmが好ましい。
前記下部電極層12上に金属層13を形成する(図1c)。
より好ましい金属層の厚さは10〜50Å、最も好ましい金属層の厚さは20〜40Åである。
上部電極層は、メッキなども可能で、真空雰囲気で形成することもできる。
上部電極層は、シャドウマスク或いはドライエッチング工程を使用してパターン化する。
(実施例)
Si基板上に形成されたPt下部電極上に30Åの厚さでAl薄膜を成長させた。これを図2の製造装置によりArガスとO2ガスを50%: 50%の割合で流しながら、ガスのイオン化のため約60WのRFをかけて Al薄膜を酸化させた。
前記薄膜に対して18000%の抵抗変化率を測定して図3aに示した。
例えば、本発明の実施例では金属層としてAlを適用しているが、Co、Ni、Fe、Ta、Ti、Au、Pt、Agも適用できる。
Claims (8)
- (i) 基板上に下部電極層を形成する段階と、
(ii) 真空の雰囲気で前記下部電極層上に金属層を形成する段階と、
(iii)真空の雰囲気で前記金属層を二元酸化膜に酸化させる段階と、
(iv) 前記金属層の形成段階(ii)と酸化段階(iii)を繰り返して所望の厚さの多層二次元酸化膜を形成する段階と、
(v)前記多層二次元酸化膜上に上部電極層を形成する段階と、を含んで成るReRAM用多層二元酸化膜の形成方法。 - 前記金属層は、Al、Co、Ni、Fe、Ta、Ti、Au、Pt、Ag及びこれらの合金で構成されるグループから選ばれた1種であることを特徴とする請求項1に記載の方法。
- 前記金属層の厚さは、5Å〜100Åであることを特徴とする請求項1に記載の方法。
- 前記金属層の厚さは、10Å〜50Åであることを特徴とする請求項3に記載の方法。
- 前記酸化段階(iii)は、遠隔酸化法を行うことを特徴とする請求項1に記載の方法。
- 前記酸化段階(iii)は、O2ガス:10〜100%とArガス:0〜90%の範囲で行うことを特徴とする請求項5に記載の方法。
- 前記酸化する段階は、RFプラズマから30W〜100Wの出力で行うことを特徴とする請求項5に記載の方法。
- 前記多層二元酸化薄膜は、100℃〜1000℃の温度範囲で1分〜24時間の範囲内でアニーリングすることを特徴とする請求項1に記載の方法。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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KR1020050059830A KR100622268B1 (ko) | 2005-07-04 | 2005-07-04 | ReRAM 소자용 다층 이원산화박막의 형성방법 |
PCT/KR2006/002610 WO2007004843A1 (en) | 2005-07-04 | 2006-07-04 | Method for forming multi-layered binary oxide film for use in resistance random access memory |
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JP2009500845A true JP2009500845A (ja) | 2009-01-08 |
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JP2008520178A Pending JP2009500845A (ja) | 2005-07-04 | 2006-07-04 | ReRAM用多層二元酸化膜の形成方法 |
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US (1) | US20080200003A1 (ja) |
EP (1) | EP1905086B1 (ja) |
JP (1) | JP2009500845A (ja) |
KR (1) | KR100622268B1 (ja) |
WO (1) | WO2007004843A1 (ja) |
Cited By (1)
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WO2007004843A1 (en) | 2007-01-11 |
EP1905086A4 (en) | 2011-12-21 |
EP1905086B1 (en) | 2013-01-16 |
US20080200003A1 (en) | 2008-08-21 |
KR100622268B1 (ko) | 2006-09-11 |
EP1905086A1 (en) | 2008-04-02 |
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