パイ空間内における電荷輸送の包括的迅速診断

• Project Area: Emergence of highly elaborated pai-space and its function
• Project/Area Number: 21108513
• Research Category: Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
• Allocation Type: Single-year Grants
• Review Section: Science and Engineering
• Research Institution: Osaka University
• Principal Investigator: 関 修平 大阪大学, 工学研究科, 教授 (30273709)
• Project Period (FY): 2009 – 2010
• Project Status: Completed (Fiscal Year 2010)
• Budget Amount: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000); Fiscal Year 2010: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000); Fiscal Year 2009: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
• Keywords: TRMC / TOF / FET / 持続長 / マイクロ波 / 電荷移動度 / 界面 / マトリクス / 共役高分子 / time-of-flight / 電気伝導度 / 包括的診断

Research Abstract

本研究は、マイクロ波による電極レス伝導度測定法(Time-Resolved Microwave Conductivity : TRMC法)をその核とし、1.TRMC法に用いるマイクロ波共振器内への多層電極構造の導入、2.TRMC法による過渡伝導度と多層電極構造Field Effect Transistor : FET特性のin-situ評価、3.電極界面への選択的光励起によるTime-of-Flight : TOF・横型TOF測定のin-situ測定、の3項目により、π電子化合物およびその集積構造体の重要な電子機能である電荷移動度について、それぞれの素子中における特性を、「1日以内」の極短時間で包括的解釈できるシステムの構築を目的としている。
本年度は、マイクロ波吸収に不活性なマトリクスとしてPMMAを使用し、この中に鎖長の異なる共役分子を分散させ、それぞれの骨格の固有の電荷輸送特性の評価を目指した。重合度をさまざまに変化させたポリチオフェン(PT)、ポリフェニレンビニレン(MEH-PPV)、ポリフルオレン(PF)、ポリピロール(PP)、およびケイ素共役主鎖を有するポリシラン(PSi1)・(PSi6)について、分子内正孔移動度の共役骨格差長依存性を検討した結果、共役骨格の1次構造により、その分子内共役系に沿って期待できる1次元移動度の飽和値はさまざまであることが明らかとなった。特に比較的長い持続長が報告されているPF・PSi6・MEH-PPV(Persistence Length>2nm)において、高い分子量域にわたる正孔移動度の上昇が観測された。これは、高分子の骨格構造制御が直接主鎖共役系の電荷輸送特性を支配すると同時に、過去1世紀以上にわたって展開されてきた高分子構造の定量議論が電子物性予測に直結することを示唆している。

Research Products

• [Journal Article] Semi-metallic Single-component Crystal of Soluble La@C82 Derivative with High Electron Mobility (2011)
  • Author(s): Seki, et al.
  • Journal Title: J.Am.Chem.Soc. Volume: 133 Pages: 2766-2771
  • Peer Reviewed
• [Journal Article] Electron Mobility in a Mercury-mediated Duplex of Triazole-linked DNA (TLDNA) (2010)
  • Author(s): Seki, et al.
  • Journal Title: Chem.Lett. Volume: 40 Pages: 318-319
  • Peer Reviewed
• [Journal Article] A Self-Threading Polythiophene : Defect-Free Insulated Molecular Wires Endowed with Long Effective Conjugation Length (2010)
  • Author(s): Seki, et al.
  • Journal Title: J.Am.Chem.Soc. Volume: 132 Pages: 14754-14756
  • Peer Reviewed
• [Journal Article] Supramolecular Structures and Photoelectronic Properties of the Inclusion Complex of a Cyclic Free-Base Porphvrin Dimer and C60 (2010)
  • Author(s): Seki, et al.
  • Journal Title: Chem.Eur.J. Volume: 16 Pages: 11611-11623
  • Peer Reviewed
• [Journal Article] Good Solvent Effects of C70 Cluster Formations and Their Electron-Transporting and Photoelectrochemical Properties (2010)
  • Author(s): Seki, et al.
  • Journal Title: J.Phys.Chem.B Volume: 114 Pages: 14287-14297
  • Peer Reviewed
• [Journal Article] Selective Formation and Efficient Photocurrent Generation of [70]Fullerene-Single-Walled Carbon Nanotube Composites (2010)
  • Author(s): T.Umeyama, S.Seki, et al.
  • Journal Title: Adv.Mater.
  • Peer Reviewed
• [Journal Article] Interfacial effect on metal/oxide nanowire junctions (2010)
  • Author(s): K.Nagashima, S.Seki, et al.
  • Journal Title: Appl Phys.Lett. 96 Pages: 73110-73110
  • Peer Reviewed
• [Journal Article] Comparison of cluster formation, film structure, microwave conductivity, and photoelectrochemical properties of composites consisting of single-walled carbon nanotubes with C60, C70, and C84 (2010)
  • Author(s): N.Tezuka, S.Seki, et al.
  • Journal Title: J.Phys.Chem.C 114 Pages: 3235-3247
  • Peer Reviewed
• [Journal Article] Hexabenzocoronene Graphitic Nanotube Appended with Dithienylethene Pendants : Photochromism for Modulation of Photoconductivity (2009)
  • Author(s): Y.He, S.Seki, et al.
  • Journal Title: Adv.Mater. 21 Pages: 1-4
  • Peer Reviewed
• [Journal Article] Insulated molecular wire with highly conductive π-conjugated polymer core (2009)
  • Author(s): J.Terao, S.Seki, et al.
  • Journal Title: J.Am.Chem.Soc. 131 Pages: 18046-18047
  • Peer Reviewed
• [Journal Article] Block-copolymer-nanowires with nanosized domain segregation and high charge mobilities as stacked p/n heterojunction arrays for repeatable photocurrent switching (2009)
  • Author(s): R.Charvet, S.Seki, et al.
  • Journal Title: J.Am.Chem.Soc. 131 Pages: 18030-108031
  • Peer Reviewed
• [Journal Article] "Bicontinuous cubic" liquid crystalline materials from discotic molecules : A special effect of paraffinic side chains with ionic liquid pendants (2009)
  • Author(s): Md.A.Alam, S.Seki, et al.
  • Journal Title: J.Am.Chem.Soc. 131 Pages: 17722-17723
  • Peer Reviewed
• [Journal Article] Ambipolar-transporting coaxial nanotubes with a tailored molecular graphene - Fullerene heterojunction (2009)
  • Author(s): Y.Yamamoto, S.Seki, et al.
  • Journal Title: Proc.Nat.Acad Sci 106 Pages: 21051-21056
  • Peer Reviewed
• [Journal Article] Air-Stable n-Type Organic Field-Effect Transistors Based on Solution-Processable Electronegative Oligomers Containing Dicyanomethylene-Substituted Cyclopenta[b]thiophene
  • Author(s): Seki, et al.
  • Journal Title: Chem.Eur.J. Volume: (In press)
  • Peer Reviewed
• [Presentation] Comprehensive Analysis of Charge Carrier Mobility in Functional Polymers for Organic Electronics (2010)
  • Author(s): S.Seki
  • Organizer: IUPAC 6^<th> International Symposium on Novel Materials and Synthesis
  • Place of Presentation: South-Central University for Nationalities, Wuhan
  • Year and Date: 2010-10-14
• [Remarks]
  • URL: http://www.chem.eng.osaka-u.ac.jp/~cmpc-lab/