JP2009033177A - 積層されたnand型抵抗性メモリセルストリングを含む不揮発性メモリ素子及びその製造方法 - Google Patents
積層されたnand型抵抗性メモリセルストリングを含む不揮発性メモリ素子及びその製造方法 Download PDFInfo
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Abstract
【解決手段】NAND型抵抗性メモリセルストリングSTR1,STR2は、ビットラインBL及びビットラインBLに直列接続された複数個の抵抗性メモリセルCL1,CL2,CL3を含み、複数個の抵抗性メモリセルCL1,CL2,CL3のそれぞれは、第1ノードN1、第2ノードN2及び第3ノードN3、第1ノードN1と第2ノードN2との間に接続されたヒータH1、H2、H3、第2ノードN2と第3ノードN3との間に接続された可変抵抗体R1、R2、R3、第1ノードN1に接続された第1端子及び第3ノードN3に接続された第2端子を有するスイッチング素子SW1、SW2、SW3とを含む。
【選択図】図1
Description
3 素子分離層
3a 活性領域
7a、7b メインゲート電極
9s メインソース
9d メインドレイン
11 下部絶縁層
11s ソースコンタクトホール
11d ドレインコンタクトホール
13s 共通ソースライン
13d ドレインパッド
15 第1絶縁層
17b 第1ボディパターン
17s 第1ソース
17c 第1チャネル
17d 第1ドレイン
23 第1ゲート電極
27 第1下部電極
29 第1相変化物質パターン
29v 第1相変化領域
31 第1上部電極
33 第2絶縁層
35b 第2ボディパターン
35s 第2ソース
35c 第2チャネル
35d 第2ドレイン
39 第2下部電極
41 第2相変化物質パターン
43 第2上部電極
45 第3絶縁層
47b 第3ボディパターン
47s 第3ソース
47c 第3チャネル
47d 第3ドレイン
51 第3下部電極
53 第3相変化物質パターン
55 第3上部電極
57 上部絶縁層
59 ビットラインコンタクトプラグ
61 ビットライン
Claims (33)
- ビットラインと、
前記ビットラインに直列接続された複数個の抵抗性メモリセルと、を含み、
前記複数個の抵抗性メモリセルのそれぞれは、
第1ノード、第2ノード及び第3ノードと、
前記第1ノードと第2ノードとの間に接続されたヒータと、
前記第2ノードと第3ノードとの間に接続された可変抵抗体と、
前記第1ノードに接続される第1端子及び前記第3ノードに接続された第2端子を有するスイッチング素子とを含むことを特徴とするNAND型抵抗性メモリセルストリング。 - 前記直列接続された複数個の抵抗性メモリセルの第1番目の抵抗性メモリセルの第3ノードはビットラインコンタクトを介して前記ビットラインと直接接続し、
前記直列接続された複数個の抵抗性メモリセルの第1番目の抵抗性メモリセルの第1ノードは第2番目の抵抗性メモリセルの第3ノードと接続していることを特徴とする請求項1に記載のNAND型抵抗性メモリセルストリング。 - 前記スイッチング素子は、ソース、ドレイン及びゲート電極を有するMOSトランジスタであり、前記第1端子は前記ソースであり、前記第2端子は前記ドレインであることを特徴とする請求項1に記載のNAND型抵抗性メモリセルストリング。
- 前記MOSトランジスタのゲート電極はワードラインを含むことを特徴とする請求項3に記載のNAND型抵抗性メモリセルストリング。
- 前記複数個の抵抗性メモリセルの一つに直列で接続されたメインスイッチング素子をさらに含むことを特徴とする請求項1に記載のNAND型抵抗性メモリセルストリング。
- 共通ソースラインをさらに含み、
前記メインスイッチング素子はメインソース、メインドレイン及びメインゲート電極を備えるメインMOSトランジスタであり、前記メインMOSトランジスタの前記メインドレインは前記複数個の抵抗性メモリセルのうちの一つと接続し、前記メインソースは前記共通ソースラインに接続し、前記メインゲート電極はメインワードラインを含むことを特徴とする請求項5に記載のNAND型抵抗性メモリセルストリング。 - 前記可変抵抗体は変化、前記ヒータ要素を介して加えられた熱に応答して非晶質状態と結晶状態との間で変化する相変化物質を含むことを特徴とする請求項1に記載のNAND型抵抗性メモリセルストリング。
- 基板と、
前記基板上の絶縁層と、
前記絶縁層内に積層され、直列接続された複数個の抵抗性メモリセルと、
前記直列接続された複数個の抵抗性メモリセルのうちの第1番目の抵抗性メモリセルが前記絶縁層上に形成され、第2番目の抵抗性メモリセルが前記第1番目の抵抗性メモリセル上に形成されてNAND型抵抗性メモリセルストリングを定義し、
前記絶縁層上に形成され、前記複数個の抵抗性メモリセルの最後の一つと電気的に接続したビットラインと、を含むことを特徴とする不揮発性メモリ素子。 - 前記複数個の抵抗性メモリセルの少なくとも一つが、
前記絶縁層内に積層されたソース領域、チャネル領域及びドレイン領域を含むボディパターンと、
前記ボディパターンの側壁上に形成されたゲート電極を含むスイッチング素子と、
前記スイッチング素子と並列に接続されたデータ保存要素と、を含み、
前記データ保存要素は、
前記スイッチング素子の前記ボディパターンと離隔された下部電極と、
前記下部電極上の可変抵抗体と、
前記可変抵抗体上の上部電極と、を含み、
前記複数個の抵抗性メモリセルの前記第1番目の抵抗性メモリセルの上部電極は、前記下部電極と前記複数個の抵抗性メモリセルの第2番目の抵抗性メモリセルのボディパターン上に形成されていることを特徴とする請求項8に記載の不揮発性半導体素子。 - 前記複数個の抵抗性メモリセルのうち最後の抵抗性メモリセルの上部電極上に形成されたビットラインコンタクトプラグをさらに含み、
前記ビットラインは前記ビットラインコンタクトプラグにより前記複数個の抵抗性メモリセルの最後の抵抗性メモリセルの上部電極と直接接続することを特徴とする請求項9に記載の不揮発性メモリ素子。 - 前記スイッチング素子のゲート電極は前記絶縁層内に前記ビットラインと直交して延長されたワードラインを含むことを特徴とする請求項9に記載の不揮発性メモリ素子。
- 前記可変抵抗体は、前記下部電極を介して加えられる熱によって非晶質状態と結晶質状態との間を変化する相変化物質層を含むことを特徴とする請求項9に記載の不揮発性メモリ素子。
- 前記基板上のメインスイッチング素子をさらに含み、前記メインスイッチング素子は前記複数個の抵抗性メモリセルの第1番目の抵抗性メモリセルと電気的に接続することを特徴とする請求項8に記載の不揮発性メモリ素子。
- 前記メインスイッチング素子は、
前記基板内のメインソース領域及びメインドレイン領域と、
前記メインソース領域と前記メインドレイン領域との間において前記基板上に形成されたメインゲート電極と、を含み、
前記メインドレイン領域は前記複数個の抵抗性メモリセルのうち第1番目の抵抗性メモリセルの前記下部電極及び前記ボディパターンと電気的に接続されたことを特徴とする請求項13に記載の不揮発性メモリ素子。 - 前記メインスイッチング素子の前記ゲート電極は、前記ボディパターンに対向する側壁上に形成されていることを特徴とする請求項9に記載の不揮発性メモリ素子。
- 前記可変抵抗体と前記下部電極は、前記絶縁層内のコンタクトホール内に限定されて形成されたことを特徴とする請求項15に記載の不揮発性メモリ素子。
- 前記コンタクトホールと前記可変抵抗体の側壁間に形成された絶縁性スペーサをさらに含むことを特徴とする請求項16に記載の不揮発性メモリ素子。
- 前記複数個の抵抗性メモリセルの少なくとも一つは、
前記絶縁層内に積層されたソース領域、チャネル領域及びドレイン領域を含むボディパターンと前記ボディパターンの側壁上に形成されたゲート電極を含むスイッチング素子と、
前記スイッチング素子から離隔された可変抵抗体と、
前記可変抵抗体と前記スイッチング素子の前記ドレイン領域上に形成された上部電極と、を含み、
前記複数個の抵抗性メモリセルの第1番目の抵抗性メモリセルの上部電極は、前記可変抵抗体及び前記複数個の抵抗性メモリセルの第1番目の抵抗性メモリセルのドレイン領域と、前記複数個の抵抗性メモリセルの第2番目の抵抗性メモリセルのソース領域と電気的に接続されたことを特徴とする請求項8に記載の不揮発性メモリ素子。 - 前記可変抵抗体はプラセオジムカルシウムマンガン酸化層(PCMO層)または遷移金属酸化層のうち一つを含むことを特徴とする請求項18に記載の不揮発性メモリ素子。
- 前記可変抵抗体は、順に積層された固定層、トンネリング絶縁層及び自由層を含む磁気トンネル接合を含むことを特徴とする請求項19に記載の不揮発性メモリ素子。
- 基板上に絶縁層を形成する工程と、
前記絶縁層内に積層された複数個の抵抗性メモリセルを、前記基板上に形成された複数個の抵抗性メモリセルの第1番目の抵抗性メモリセル上に第2番目の抵抗性メモリセルが形成されてNAND型抵抗性メモリセルストリングが定義されるように形成する工程と、
前記絶縁層上に前記複数個の抵抗性メモリセルのうち最後の抵抗性メモリセルに電気的に接続されるビットラインを形成する工程と、
を含むことを特徴とする不揮発性メモリ素子の製造方法。 - 前記抵抗性メモリセルの少なくとも一つの抵抗性メモリセルを形成する工程は、
前記基板上に層間絶縁層を形成する工程と、
前記層間絶縁層内にソース領域、チャネル領域及びドレイン領域が積層されたボディパターンを含むスイッチング素子を形成する工程と、
前記層間絶縁層内に前記スイッチング素子の前記ソース領域と前記ドレイン領域との間に電気的に接続された情報保存要素を形成する工程と、
を含むことを特徴とする請求項21に記載の不揮発性メモリ素子の製造方法。 - 前記スイッチング素子を形成する工程は、
前記層間絶縁層をパターニングして開口部を形成する工程と、
前記層間絶縁層内の前記開口部内に前記ボディパターンを形成する工程と、
前記層間絶縁層内の前記開口部内に順に積層されたソース、チャネル及びドレインを画定するために前記ボディパターン内部に不純物イオンを注入し、前記ボディパターンの側壁上にゲート電極を形成する工程と、
を含むことを特徴とする請求項22に記載の不揮発性メモリ素子の製造方法。 - 前記ゲート電極を形成する工程は、
前記ボディパターンの側壁を露出させるグルーブを形成するために前記層間絶縁層をエッチングする工程と、
前記露出したボディパターンの側壁上にゲート絶縁層を形成する工程と、
前記ゲート絶縁層上の前記グルーブ内に前記ゲート電極を形成する工程と、
を含むことを特徴とする請求項23に記載の不揮発性メモリ素子の製造方法。 - 前記情報保存要素を形成する工程は、
前記層間絶縁層を貫通する開口部を形成する工程と、
前記開口部内に下部電極を形成する工程と、
前記下部電極上に可変抵抗体を形成する工程と、
前記可変抵抗体上に上部電極を形成する工程と、を含み、
前記複数個の抵抗性メモリセルの第1番目の抵抗性メモリセルの上部電極は前記複数個の抵抗性メモリセルの第2番目の抵抗性メモリセルの下部電極及びボディパターン上に形成されることを特徴とする請求項22に記載の不揮発性メモリ素子の製造方法。 - 前記可変抵抗体は、前記下部電極を介して加えられる熱によって非晶質状態と結晶質状態との間を変化する相変化物質層を含むことを特徴とする請求項25に記載の不揮発性メモリ素子の製造方法。
- 前記複数個の抵抗性メモリセルの最後の抵抗性メモリセルの上部電極上にビットラインコンタクトプラグを形成する工程をさらに含み、
前記ビットラインは前記ビットラインコンタクトプラグにより前記複数個の抵抗性メモリセルのうち最後の抵抗性メモリセルの上部電極と直接的に接続する工程を特徴とする請求項25に記載の不揮発性メモリ素子の製造方法。 - 前記絶縁層を形成する前に、
前記基板内にメインソース領域とメインドレイン領域を形成し、
メインスイッチング素子を定義するために前記ソース領域と前記ドレイン領域との間の前記基板上にメインゲート電極を形成し、
前記複数個の抵抗性メモリセルを形成する工程は、前記メインスイッチング素子上に前記複数個の抵抗性セルのうちの第1番目の抵抗性メモリセルを形成して前記ソース領域が前記メインスイッチング素子の前記メインドレイン領域と電気的に接続する工程を含むことを特徴とする請求項22に記載の不揮発性メモリ素子の製造方法。 - 前記情報保存要素を形成する工程は、
前記層間絶縁層を貫通する前記開口部内の前記下部電極上に前記可変抵抗体を形成して前記可変抵抗体を前記開口部内に限定する工程と、
前記可変抵抗体及び前記ボディパターン上に前記上部電極を形成する工程と、
を含むことを特徴とする請求項25に記載の不揮発性メモリ素子の製造方法。 - 前記可変抵抗体を形成する前に、前記層間絶縁層内の前記開口部の側壁上に絶縁性スペーサを形成する工程をさらに含むことを特徴とする請求項29に記載のNAND型抵抗性メモリセルストリングの製造方法。
- 前記情報保存要素を形成する工程は、
前記層間絶縁層を貫通するホールを形成する工程と、
前記ホール内に可変抵抗体を形成する工程と、
前記可変抵抗体及び前記ボディパターン上に上部電極を形成する工程と、
を含むことを特徴とする請求項22に記載の不揮発性メモリ素子の製造方法。 - 前記可変抵抗体は、プラセオジムカルシウムマンガン酸化層(PCMO層)及び遷移金属酸化層のうちの一つを含むことを特徴とする請求項31に記載の不揮発性メモリ素子の製造方法。
- 前記可変抵抗体は、順に積層された固定層、トンネリング絶縁層及び自由層を含む磁気トンネル接合構造を含むことを特徴とする請求項31に記載の不揮発性メモリ素子の製造方法。
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- 2008-07-25 TW TW097128531A patent/TWI517359B/zh active
- 2008-07-28 JP JP2008194064A patent/JP5661992B2/ja active Active
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| WO2012049721A1 (ja) * | 2010-10-12 | 2012-04-19 | 株式会社日立製作所 | 半導体記憶装置 |
| JP2012084676A (ja) * | 2010-10-12 | 2012-04-26 | Hitachi Ltd | 半導体記憶装置 |
| JP6411005B1 (ja) * | 2017-11-08 | 2018-10-24 | Tdk株式会社 | トンネル磁気抵抗効果素子、磁気メモリ、及び内蔵型メモリ |
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Also Published As
| Publication number | Publication date |
|---|---|
| US8036018B2 (en) | 2011-10-11 |
| US20090027955A1 (en) | 2009-01-29 |
| TWI517359B (zh) | 2016-01-11 |
| TW200913233A (en) | 2009-03-16 |
| CN101354917A (zh) | 2009-01-28 |
| CN101354917B (zh) | 2014-05-07 |
| KR101258268B1 (ko) | 2013-04-25 |
| US20110044093A1 (en) | 2011-02-24 |
| DE102008034003A1 (de) | 2009-01-29 |
| DE102008034003B4 (de) | 2022-02-10 |
| JP5661992B2 (ja) | 2015-01-28 |
| KR20090011452A (ko) | 2009-02-02 |
| US7843718B2 (en) | 2010-11-30 |
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