JP4890747B2 - 機能性分子装置 - Google Patents
機能性分子装置 Download PDFInfo
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- JP4890747B2 JP4890747B2 JP2004184589A JP2004184589A JP4890747B2 JP 4890747 B2 JP4890747 B2 JP 4890747B2 JP 2004184589 A JP2004184589 A JP 2004184589A JP 2004184589 A JP2004184589 A JP 2004184589A JP 4890747 B2 JP4890747 B2 JP 4890747B2
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- HHPCNRKYVYWYAU-UHFFFAOYSA-N 4-cyano-4'-pentylbiphenyl Chemical group C1=CC(CCCCC)=CC=C1C1=CC=C(C#N)C=C1 HHPCNRKYVYWYAU-UHFFFAOYSA-N 0.000 claims description 43
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- UBLFCBGAMXCCPT-UHFFFAOYSA-N silver 4-(4-pentylphenyl)benzonitrile Chemical compound [Ag+].C(CCCC)C1=CC=C(C=C1)C1=CC=C(C=C1)C#N UBLFCBGAMXCCPT-UHFFFAOYSA-N 0.000 description 10
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- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
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- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 description 1
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- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
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- H—ELECTRICITY
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
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- B82—NANOTECHNOLOGY
- B82B—NANOSTRUCTURES FORMED BY MANIPULATION OF INDIVIDUAL ATOMS, MOLECULES, OR LIMITED COLLECTIONS OF ATOMS OR MOLECULES AS DISCRETE UNITS; MANUFACTURE OR TREATMENT THEREOF
- B82B1/00—Nanostructures formed by manipulation of individual atoms or molecules, or limited collections of atoms or molecules as discrete units
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y10/00—Nanotechnology for information processing, storage or transmission, e.g. quantum computing or single electron logic
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- H01L29/02—Semiconductor bodies ; Multistep manufacturing processes therefor
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- H10K10/40—Organic transistors
- H10K10/46—Field-effect transistors, e.g. organic thin-film transistors [OTFT]
- H10K10/462—Insulated gate field-effect transistors [IGFETs]
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- H10K19/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic element specially adapted for rectifying, amplifying, oscillating or switching, covered by group H10K10/00
- H10K19/10—Integrated devices, or assemblies of multiple devices, comprising at least one organic element specially adapted for rectifying, amplifying, oscillating or switching, covered by group H10K10/00 comprising field-effect transistors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y10S977/902—Specified use of nanostructure
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- Thin Film Transistor (AREA)
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Description
前記チャネル部が、誘電率異方性又は/及び双極子モーメントを有する分子と、金属 イオンと、共役系分子とを含み、
前記金属イオンと、前記誘電率異方性又は/及び双極子モーメントを有する分子と、 前記共役系分子とは、錯体を形成しており、
前記誘電率異方性又は/及び双極子モーメントを有する分子に電界を印加する前記電 界印加手段と、前記共役系分子に対する例えば電子の入出力手段とを有する、
機能性分子装置として構成されるのがよい。
電界の印加により立体構造が変化して機能を発現する分子素子1の機能の1例として、スイッチング動作が考えられる。図1は、金属イオン3にルイス塩基分子及び共役系を有する導電性基軸分子2が錯体を形成してなる機能性分子素子1を例として、機能性分子素子1に電界を印加した時、金属イオン3の周辺で起こる変化をモデル化して図示した概略側面図である。図1では、説明のため、ルイス塩基分子は、正の誘電率異方性を有する分子、又は分子の長軸方向に双極子モーメントを有する分子14であるとする。
ここでは、共役系を有し、導電性を示す基軸分子2としてポリピロール22を用い、金属イオン3として銀(I)イオン23を用い、分子の長軸方向に双極子モーメントを有するルイス塩基分子14として4-ペンチル-4'-シアノビフェニル(以下、5CBと略記することもある。)24を用い、これらを組み込んでチャネル部を構成した電界効果型分子デバイス21及びその作製工程を説明する。
動作の単位が分子1個、電子1個であるので、基本的に低消費電力で動作し、発熱量 が少ないので、高集積化しても発熱による問題が起こりにくい。
最近の液晶の高速応答性の改善に見られるように、材料や構造を工夫することで、従 来の無機半導体結晶以上の高速応答性も期待できる。
通常の有機化合物の合成では、無機半導体の製造プロセスで使われるような人体や環 境に有害な試薬等を必要としない。
多様な有機分子の特性を生かせば、例えば味覚センサやにおいセンサ等、従来実現で きなかった機能を実現できる。
上記したように電界の印加により立体構造が変化して機能を発現する機能性分子素子は、後述する電界処理の有無により、互いに逆のI−V特性(電流−電圧特性)を示す。従って、この機能性分子素子は、CMOSトランジスタからなるインバータ(NOTゲート)を構成することができる。
図3及び図4に示した電界効果型分子デバイス21を作製した。まず、4-ペンチル-4'-シアノビフェニル24に制御用の電界を印加するための制御電界印加用電極31及び36と、ポリピロール22の導電度を測定するための導電度測定用電極33及び34とを形成した。
上記の例と同様にして作製した電界効果型分子デバイス21の制御電界印加用電極31と36との間に加える電界Vgをゼロから徐々に増加させていき、くし形電極33と34との間のポリピロール膜22を流れる電流密度Idsを交流バイアス電圧の下で測定すると、電界Vgがオフの時には電流密度Idsは小さいが、印加する電界Vgの増加に応じて電流密度Idsが徐々に増加する変調作用が観測された。また、印加する電界Vgを徐々に減少させていくと、電流密度Idsは減少して行くものの、履歴現象が観測された。即ち、同じ大きさの印加電界Vgに対して、印加電界Vgを減少させていく場合に測定された電流密度Idsは、印加電界Vgを増加させていく場合に測定された電流密度Idsに比べて大きかった。
上記した例と同様に作製したポリピロール−銀(I)−5CB錯体に対して、使用に先立って高周波電界を印加する前処理(10kHz、100V、1時間)を施した以外は同様にして、電界効果型分子デバイス21を作製した。この前処理用の電界印加を行う時間は10分以上あれば十分である。
図22及び図23に示すように、多数本並置されたソース電極S(33)とドレイン電極D(34)と、これらに直交した多数本のゲート電極G(31a、31b)との間に絶縁層(SiO2)32を形成し、更に、上記したポリピロール−銀(I)−5CB錯体を上面に注入してチャネル部51を形成した各ソース電極及びドレイン電極の組とゲート電極との交差部をIタイプのゲート(スイッチ部)50a、IIタイプのゲート(スイッチ部)50bとして、CMOSインバータを多数個作成した。なお、この作製方法は、上記した電界効果型分子デバイスについて述べた方法と同様であるので、ここでは詳しくは説明しない。IIタイプのゲートにおいては、予め10kHz、100V、1時間の高周波電圧をゲート電極に印加して前処理を施した。
3…ルイス酸金属イオン、
4…誘電率異方性又は双極子モーメントを有するルイス塩基分子、
6…錯体(錯体形成部)、7…π電子、8…電子の流れ、
14…分子の長軸方向に双極子モーメントを有する分子、
21…電界効果型分子デバイス、22…ポリピロール、23…銀(I)イオン、
24…4-ペンチル-4'-シアノビフェニル、
31…第1の基板(制御電界印加用電極、高濃度にドープされたシリコン)、
31a…ゲート(G)、31b…バックゲート(BG)、
32…絶縁層(酸化シリコン膜)、33、34…導電度測定用くし形電極、
35…第2の基板(ガラス基板)、
36…ITO電極(もう1つの制御電界印加用電極)、37…ホモジニアス配向膜、
38…封止材、41…制御電界印加用電源、42…導電性測定用電源、43…電流計、
50a…ゲート(Iタイプ)、50b…ゲート(IIタイプ)、
S…ソース電極、D…ドレイン電極、G…ゲート電極
Claims (17)
- 電界で誘起される分子構造変化によってパイ電子共役系が変化する化合物からなるチャネル部と、前記電界を印加する電界印加手段と、前記チャネル部を通して前記電界に応じた出力を取り出す出力手段と、ゲートとによって構成されたトランジスタを複数個有し、これらのトランジスタの前記ゲートが互いに接続されていて、前記電界によって前記複数個のトランジスタが互いに異なるチャネル抵抗を示し、前記チャネル部を形成する前記化合物が、誘電率異方性又は/及び双極子モーメントを有する分子と、金属イオンと、ポリピロールからなる共役系分子とからなる金属錯体分子である、機能性分子装置。
- 前記トランジスタの複数個によって論理ゲート回路が構成されている、請求項1に記載した機能性分子装置。
- 前記トランジスタの複数個が前記電界によって互いに異なるチャネル抵抗を示すインバータとして前記論理ゲート回路が構成されている、請求項2に記載した機能性分子装置。
- 前記共役系分子に対する入出力手段を有する、請求項1に記載した機能性分子装置。
- 前記入出力手段が電子を入出力する、請求項4に記載した機能性分子装置。
- 前記誘電率異方性又は/及び双極子モーメントを有する分子が前記電界を印加するための電極上で配向しており、前記金属イオン及び前記共役系分子が少なくとも対向電極間に配置されて、この対向電極の少なくとも一方から前記電界に対応した出力が取り出される、請求項1に記載した機能性分子装置。
- 前記共役系分子によって前記チャネル部の導電路が形成され、前記誘電率異方性又は/及び双極子モーメントを有する分子に作用する前記電界の変化によって、前記導電路の導電性が制御される、請求項6に記載した機能性分子装置。
- 前記トランジスタの複数個のうち特定のトランジスタにおいて、前記電界の印加に先立って前記金属錯体分子に対して高周波電界を印加することによって、前記特定のトランジスタの前記導電路の導電性が変更されている、請求項7に記載した機能性分子装置。
- 前記誘電率異方性又は/及び双極子モーメントを有する分子に作用する前記電界の変化によって、この分子の電界方向との位置関係が変化し、この分子と前記共役系分子とがなす角度、前記金属イオンの作用部位又は前記金属錯体分子の立体構造が変化する、請求項7に記載した機能性分子装置。
- 前記共役系分子の層と、前記誘電率異方性又は/及び双極子モーメントを有する分子の層とが積層体をなしている、請求項7に記載した機能性分子装置。
- 第1の電極上に絶縁層が設けられ、この絶縁層の上に互いに接触しないように第2の電極と第3の電極とが形成され、少なくともこれらの第2の電極と第3の電極との間に前記積層体が配され、この積層体の前記誘電率異方性又は/及び双極子モーメントを有する分子の層上に直接若しくは絶縁層を介して第4の電極が設けられた、請求項10に記載した機能性分子装置。
- 前記誘電率異方性又は/及び双極子モーメントを有する分子は、ルイス塩基分子である、請求項1に記載した機能性分子装置。
- 前記金属イオンは、ルイス酸である、請求項1に記載した機能性分子装置。
- 前記誘電率異方性又は/及び双極子モーメントを有する分子は、電界の作用で配向変化する、請求項1に記載した機能性分子装置。
- 前記誘電率異方性又は/及び双極子モーメントを有する分子が、電界の作用で配向変化することにより、前記共役系分子の導電性が変化する、請求項14に記載した機能性分子装置。
- 前記誘電率異方性又は/及び双極子モーメントを有する分子が4-ペンチル-4'-シアノビフェニルである、請求項1に記載した機能性分子装置。
- 前記金属イオンが銀イオンである、請求項1に記載した機能性分子装置。
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