JP2007329500A - 垂直ナノチューブを利用した不揮発性メモリ素子 - Google Patents
垂直ナノチューブを利用した不揮発性メモリ素子 Download PDFInfo
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- 239000002071 nanotube Substances 0.000 title claims abstract description 46
- 239000000758 substrate Substances 0.000 claims abstract description 19
- 230000002093 peripheral effect Effects 0.000 claims abstract description 16
- 230000027756 respiratory electron transport chain Effects 0.000 claims abstract description 5
- 238000003860 storage Methods 0.000 claims description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 10
- 239000002041 carbon nanotube Substances 0.000 claims description 10
- 229910021393 carbon nanotube Inorganic materials 0.000 claims description 10
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 8
- 229910052710 silicon Inorganic materials 0.000 claims description 8
- 239000010703 silicon Substances 0.000 claims description 8
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 229910000154 gallium phosphate Inorganic materials 0.000 claims description 3
- LWFNJDOYCSNXDO-UHFFFAOYSA-K gallium;phosphate Chemical compound [Ga+3].[O-]P([O-])([O-])=O LWFNJDOYCSNXDO-UHFFFAOYSA-K 0.000 claims description 3
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 7
- 150000004767 nitrides Chemical class 0.000 description 6
- 230000006870 function Effects 0.000 description 5
- 230000007423 decrease Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000011232 storage material Substances 0.000 description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
- 238000005229 chemical vapour deposition Methods 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 230000007257 malfunction Effects 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 238000002230 thermal chemical vapour deposition Methods 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 238000003491 array Methods 0.000 description 1
- 229910021419 crystalline silicon Inorganic materials 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 1
- 238000001338 self-assembly Methods 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 238000001308 synthesis method Methods 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
- 239000012808 vapor phase Substances 0.000 description 1
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- G11C16/0466—Erasable programmable read-only memories electrically programmable using variable threshold transistors, e.g. FAMOS comprising cells with charge storage in an insulating layer, e.g. metal-nitride-oxide-silicon [MNOS], silicon-oxide-nitride-oxide-silicon [SONOS]
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Abstract
【解決手段】メモリ素子は、ソース領域13の形成された基板11と、基板11上に垂直成長され、一端部がソース領域13と連結されて電子移動チャンネルになるナノチューブカラム10を、複数配列してなるナノチューブカラムアレイと、ナノチューブカラム10の外周面に形成されるメモリセル19と、メモリセル19の外周面に形成される制御ゲート17及び、ナノチューブカラム10の他端部と連結されるドレイン領域15と、を含む。イオンドーピングの必要ない単純な工程を通じて超高集積の不揮発性メモリ素子が具現できる。
【選択図】図1
Description
トランジスタに多量の電流を流せるためには、トランジスタが高いトランスコンダクタンス(gm)特性を有している必要がある。そのため、最近は、高いトランスコンダクタンス特性を有するMOSFET(Metal Oxide Field Effect Transistor)を半導体メモリ素子のスイッチング素子として利用する傾向がある。
MOSFETのトランスコンダクタンスは、同じ電圧条件の下では、チャンネル長、ゲート酸化膜厚などに反比例し、表面移動度、ゲート酸化膜の誘電率及びチャンネルの幅には比例する。これらのうち、表面移動度及び酸化膜の誘電率は、材料、すなわち方向性を有するシリコンウエハ、シリコン酸化膜などによって定まる値であるので、高いトランスコンダクタンスを達成するためには、チャンネルの幅と長さとの比(W/Lratio)を大きくするか、酸化膜厚を薄くすべきである。
例えば、制御ゲートの大きさが減少すれば、制御ゲートの断面積が減少してトランジスタに大きい電気的抵抗を誘発する。ソース及びドレイン領域の大きさの減少は、厚さ、すなわち接合深さの減少を誘発して更に大きい電気的抵抗を招くか、ソースとドレイン間の距離が減少するためにソースとドレインとの空乏層がコンタクトする(contacts)パンチスルー現象を誘発して電流の調節を不能にする。また、前記のようなメモリ素子の寸法の減少によって、電流の移動通路であるチャンネルの幅が30nm以下に減少すると、電流の円滑な流れが妨害されてメモリ素子を誤動作させる。すなわち、従来のSiMOSFETを基本とするメモリ素子では、素子の高集積化に限界がある。
図1は、本発明の第1実施形態に係るメモリ素子を示した断面図であり、図2は、当該メモリ素子の一部を切り欠いて示した斜視図である。
図1及び図2に示すように、基板11はソース領域(S)13を含み、基板11の上面にはソース領域13と連結されてナノチューブカラム10(nanotube column)が垂直に位置する。ナノチューブカラム10の外周面にはメモリセル19が形成され、形成されたメモリセル19の外周面には、さらに、制御ゲート17が形成される。ナノチューブカラム10とメモリセル19との上面にはドレイン領域15が形成される。この構造を有するメモリ素子が基板11上に複数配列されることにより、ナノチューブカラムアレイが形成される。
図5に示すように、ゲート電圧が負の電圧から0Vに至るまで、ドレイン電流Idは一定に維持されていて、ゲート電圧が増加する(0Vよりも大きくなる)につれてドレイン電流Idは顕著に減少するのが分かる。換言すれば、本発明の第1の実施形体に係るメモリ素子は、超高集積メモリ素子としての動作特性がよく現れているのが分かる。
例えば、本発明の属する技術分野の当業者であれば、本発明の技術的思想によって電子貯蔵膜または電子貯蔵物質で電子を捕獲する特性に優れた他の物質が利用できる。それゆえに、本発明の範囲は、説明された実施形態によって限定されるものではなく、特許請求の範囲に記載された技術的思想によって定められねばならない。
11 基板
13 ソース領域
15 ドレイン領域
17 制御ゲート
19 メモリセル
19a、19c オキシド膜
19b ナイトライド膜
S ソース
Claims (7)
- ソース領域が形成された基板と、
前記基板上に垂直成長され、一端部が前記ソース領域と連結されて電子移動チャンネルになるナノチューブカラムを、複数配列してなるナノチューブカラムアレイと、
前記ナノチューブカラムの外周面に形成されるメモリセルと、
前記メモリセルの外周面に形成される制御ゲートと、
前記ナノチューブカラムの他端部と連結されるドレイン領域と、を含むことを特徴とするメモリ素子。 - 前記基板は、アルミニウムオキシド、シリコン、及びメソポーラスからなるグループから選択される材料で形成することを特徴とする請求項1に記載のメモリ素子。
- 前記ナノチューブカラムは、炭素ナノチューブ、ボロナイトライドナノチューブ、及びガリウムリン酸塩ナノチューブからなるグループから選択されることを特徴とする請求項1に記載のメモリ素子。
- 前記メモリセルは、
前記ナノチューブの外周面に形成される第1絶縁膜と、
前記第1絶縁膜の外周面に形成される電子貯蔵膜と、
前記電子貯蔵膜の外周面に形成され、前記制御ゲートと接触する第2絶縁膜と、を具備することを特徴とする請求項1に記載のメモリ素子。 - 前記第1及び第2絶縁膜は、シリコンオキシド膜であることを特徴とする請求項4に記載のメモリ素子。
- 前記電子貯蔵膜は、シリコン膜またはシリコンナイトライド膜であることを特徴とする請求項4に記載のメモリ素子。
- 前記電子貯蔵膜は、100nm以下の厚さを有することを特徴とする請求項4に記載のメモリ素子。
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US20050167655A1 (en) | 2004-01-29 | 2005-08-04 | International Business Machines Corporation | Vertical nanotube semiconductor device structures and methods of forming the same |
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US7829883B2 (en) | 2004-02-12 | 2010-11-09 | International Business Machines Corporation | Vertical carbon nanotube field effect transistors and arrays |
US7709880B2 (en) * | 2004-06-09 | 2010-05-04 | Nantero, Inc. | Field effect devices having a gate controlled via a nanotube switching element |
US7109546B2 (en) | 2004-06-29 | 2006-09-19 | International Business Machines Corporation | Horizontal memory gain cells |
EP1766678A1 (en) * | 2004-06-30 | 2007-03-28 | Koninklijke Philips Electronics N.V. | Method for manufacturing an electric device with a layer of conductive material contacted by nanowire |
KR100666187B1 (ko) * | 2004-08-04 | 2007-01-09 | 학교법인 한양학원 | 나노선을 이용한 수직형 반도체 소자 및 이의 제조 방법 |
US7233071B2 (en) * | 2004-10-04 | 2007-06-19 | International Business Machines Corporation | Low-k dielectric layer based upon carbon nanostructures |
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JP2004172616A (ja) | 2004-06-17 |
KR20040043043A (ko) | 2004-05-22 |
US20040095837A1 (en) | 2004-05-20 |
EP1420414A1 (en) | 2004-05-19 |
CN1317768C (zh) | 2007-05-23 |
JP5307993B2 (ja) | 2013-10-02 |
JP4047797B2 (ja) | 2008-02-13 |
CN1501503A (zh) | 2004-06-02 |
DE60300477D1 (de) | 2005-05-12 |
DE60300477T2 (de) | 2006-02-23 |
EP1420414B1 (en) | 2005-04-06 |
US6930343B2 (en) | 2005-08-16 |
KR100790859B1 (ko) | 2008-01-03 |
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