高度界面制御有機・無機複合構造による量子物性の発現と応用

2006 Fiscal Year Annual Research Report

• Project/Area Number: 14GS0207
• Research Institution: The University of Tokyo
• Principal Investigator: 斉木 幸一朗 The University of Tokyo, 大学院・新領域創成科学研究科, 教授 (70143394)
• Co-Investigator(Kenkyū-buntansha): 青木 秀夫 東京大学, 大学院・理学系研究科, 教授 (50114351) ; 島田 敏宏 東京大学, 大学院・理学系研究科, 准教授 (10262148) ; 上野 啓司 埼玉大学, 大学院・理工学研究科, 准教授 (40223482) ; 佐々木 岳彦 東京大学, 大学院・新領域創成科学研究科, 准教授 (90242099) ; 池田 進 東京大学, 大学院・新領域創成科学研究科, 助教 (20401234)
• Keywords: ヘテロ界面 / 有機薄膜 / 電界効果トランジスタ / 走査トンネル顕微鏡 / NEXAFS / ペンタセン / フラレン / グラフェン

Research Abstract

高度に制御された有機無機ヘテロ界面を実現し,電界による電荷注入や界面相互作用における多体効果による新奇量子現象の発現を最終目標として今年度は以下の研究を行なった.また,最終年度としての総括もおこなった.
金属-有機物界面の電荷注入過程と電荷極性の相関;同一試料に対して薄膜成長中のFET測定,電子分光による薄膜評価が行なえるシステムを改良し,FETにおけるキャリアの極性と電子状態の変化を詳細に追跡した.その結果,電荷極性は金属のフェルミ準位と有機半導体のHOMO-LUMOギャップの相対位置関係により決まり,有効チャネル伝導度は界面のエネルギー障壁に対して指数関数的に変化することを初めて実験的に実証した.
有機薄膜表面形態と電気伝導現象の相関;先年度に開発した,同一試料に対してFET測定とAFMによる薄膜形態測定が可能な装置を用いて,ペンタセン薄膜の形態安定性と伝導度の相関を詳細に追究した.その結果,形態変化を齎す分子移動は界面第1-2層目の境界から生起することが明らかになった.薄膜の安定化を図るためには第2層の結晶系の制御が重要であることは当該分野での大きな指針となる.
ベンゼンの重合によるナノグラフェンの合成とエッジ状態,磁気秩序;ベンゼンの重合によるナノグラフェンについて,STM観察によりエッジの構造について詳細に探究した結果,本手法により作製されたナノグラフェンの端は70%以上の確率でジグザグ端であることが判明した.STM像のバイアス依存性から,ジグザグ端にはフェルミ面近傍に状態を持つことが明らかとなり,従前の分光学的な結果と整合した.また,高分解能電子エネルギー損失分光から,ジグザグ端には水素原子が1あるいは2個吸着した状態があることがわかった.これらの結果および磁気光学カー効果の結果について理論的な検討をおこなった.

Research Products

• [Journal Article] Femtosecond depolarization dynamics of tris (8-hydroxyquinoline) aluminum films (2008)
  • Author(s): N. Ogawa, A. Miyata, H. Tamaru, T. Suzuki, T. Shimada, T. Hasegawa, K. Saiki, and K. Miyano
  • Journal Title: Chemical Physics Letters 450 Pages: 335-339
• [Journal Article] Investigation of complex channel capacitance in C_<60> field effect transistor and evaluation of the effect of grain boundaries (2007)
  • Author(s): T. Miyadera, M. Nakayama, S. Ikeda, K. Saiki
  • Journal Title: Current Applied Physics 7 Pages: 87-91
• [Journal Article] Electron energy loss spectroscopy of ultrathin pentacene field effect transistor (2007)
  • Author(s): T. Shimada and K. Saiki
  • Journal Title: Journal of Electron Spectroscopies & Related Phenomena 154 Pages: 119-122
• [Journal Article] Orientation control of pentacene molecules and transport anisotropy of the thin film transistors by photo-aligned polyimide film (2007)
  • Author(s): D. Guo, K. Sakamoto, K. Miki, S. Ikeda and K. Saiki
  • Journal Title: Applied Physics Letters 90 Pages: 102117.(3)
• [Journal Article] High insulating quality CaF_2 Pseudomorphic films on Si (111) (2007)
  • Author(s): N. S. Sokolov, A. K. Kaveev, A. V. Krupin, S. E. Tyaginov, M. I. Vexler, S. Ikeda, K. Tsutsui, K. Saiki
  • Journal Title: Applied Physics Letters 90 Pages: 142909.(3)
• [Journal Article] Visualization of induced charge in an organic thin-film transistor by cross-sectional potential mapping (2007)
  • Author(s): S. Ikeda, T. Shimada, M. Kiguchi, and K. Saiki
  • Journal Title: Journal of Applied Physics 101 Pages: 94509.(8)
• [Journal Article] Spontaneous aggregation of pentacene molecules and its influence on field effect mobility (2007)
  • Author(s): G. Yoshikawa, J. T. Sadowski, A. Al-Mahboob, Y. Fujikawa, T. Sakurai, Y. Tsuruma, S. Ikeda, K. Saiki
  • Journal Title: Applied Physics Letters 90 Pages: 251906.(3)
• [Journal Article] Analysis of charge transport in a polycrystalline pentacene TFT by temperature and gate bias dependent mobility and conductance (2007)
  • Author(s): D. Guo, T. Miyadera, S. Ikeda, T. Shimada and K. Saiki
  • Journal Title: Journal of Appliod Physics 102 Pages: 23706.(8)
• [Journal Article] Low-leakage MIS structures with 1.5-6 nm CaF_2 insulating layer on Si (111) (2007)
  • Author(s): N. S. Sokolov, I. V. Grekhov, S. Ikeda, A. K. Kaveev, A. V. Krupin, K. Saiki, K. Tsutsui, S. E. Tyaginov and M. I. Vexler
  • Journal Title: Microelectronic Engineering 84 Pages: 2247-2250.
• [Journal Article] Electronic structure of octane on Cu (111) and Ni (111) studied by near edge X-ray absorption fine structure (2007)
  • Author(s): M. Kiguchi, S. Entani, S. Ikeda, G. Yoshikawa, I. Nakai, H. Kondoh, T. Ohta, and K. Saiki
  • Journal Title: Surface Science 601 Pages: 4074-4077
• [Journal Article] Effect of the organic buffer Layer on the performance of apentacene field effect transistor fabricated on a natural micagate dielectric (2007)
  • Author(s): A. Matsumoto, R, Onoki, K. Saiki, S. Ikeda and K. Ueno
  • Journal Title: Japanese Journal of Applied Physics 46 Pages: L913-L916
• [Journal Article] Metal-induced Urbach tail at the gold/pentacene interface of top contact FET (2007)
  • Author(s): M. Ohtomo, T. Shimada, K. Saiki, and T. Hasegawa
  • Journal Title: Journal of Applied Physics 102 Pages: 64510.(4)
• [Journal Article] ペンタセン薄膜の光電子分光 -有機半導体伝導機構解明に向けて- (2007)
  • Author(s): 池田 進
  • Journal Title: 分光研究 56 Pages: 68-70
• [Journal Article] Metal induced gap states at tetratetracontane/Cu interface (2006)
  • Author(s): M. Kiguchi, G. Yoshikawa, K. Saiki, R. Arita, H. Aoki
  • Journal Title: Journal de Physique IV 132 Pages: 199-203
• [Journal Article] Fabrication of an organic field-effect transistor on a mica gate dielectric (2006)
  • Author(s): A. Matsumoto, R. Onoki, K. Ueno, S. Ikeda, K. Saiki
  • Journal Title: Chemistry Letters 35 Pages: 354-355
• [Journal Article] Growth of nanographite on Pt (111) and its edge state (2006)
  • Author(s): S. Entani, S. Ikeda, M. Kiguchi, K. Saiki, G. Yoshikawa, I. Nakai, H. Kondoh, T. Ohta
  • Journal Title: Applied Physics Letters 88 Pages: 153126.(3)
• [Journal Article] Effect of annealing on the mobility and morphology of thermally activated pentacene Thin Film Transistors (2006)
  • Author(s): D. Guo, S. Ikeda, K. Saiki, H. Miyazoe, K. Terashima
  • Journal Title: Journal of Applied Physics 99 Pages: 94502.(7)
• [Journal Article] In-situ measurement of molecular orientation of the pentacene ultrathin films grown on SiO_2 substrates (2006)
  • Author(s): G. Yoshikawa, T. Miyadera, K. Ueno, R. Onoki, I. Nakai, S. Entani, S. Ikeda, D. Guo, M. Kiguchi, H. Kondoh, T. Ohta, K. Saiki
  • Journal Title: Surface Science 600 Pages: 2518-2522
• [Journal Article] Graphoepitaxy of sexithiophene on thermally-oxidized silicon surface with artificial periodic grooves (2006)
  • Author(s): S. Ikeda, K Saiki, K. Tsutsui, T. Edura, Y. Wada, H. Miyazoe, K. Terashima, K. Inaba, T. Mitsunaga, and T. Shimada
  • Journal Title: Applied Physics Letters 88 Pages: 251905.(3)
• [Journal Article] Structure of organic thin films grown on surface-modified tantalum oxide (2006)
  • Author(s): R. Onoki, S. Abe, K. Ueno. H. Nakahara, and K. Saiki
  • Journal Title: Chemistry Letters 35 Pages: 746-747
• [Journal Article] Anisotropic polymerization of a long-chain diacetylene derivative Langmuir-Blodgett film on a step-bunched SiO_2/Si Surface (2006)
  • Author(s): R. Onoki, K. Ueno, H. Nakahara, G. Yoshikawa, S. Ikeda, S. Entani, T. Miyadera, I. Nakai, H. Kondoh, T. Ohta, M. Kiguchi, K. Saiki
  • Journal Title: Langmuir 22 Pages: 5742-5747
• [Journal Article] Sexithiophene films on cleaved KBr (l00) towards well-ordered semiconducting films (2006)
  • Author(s): Z. Chen, S. Ikeda, and K. Saiki
  • Journal Title: Materials Science and Engineering B 133 Pages: 195-199
• [Journal Article] Interaction between surface migrating pentacene molecules and chemically modified surfaces of silicon oxides studied by pulsed molecular beam scattering (2006)
  • Author(s): H. Ichikawa, A. Koma, K. Saiki, T. Shimada
  • Journal Title: Surface Science 600 Pages: L236-L239
• [Journal Article] Effect of UV/ozone treatment of the dielectric layer on the device performance of pentacene thin film transistors (2006)
  • Author(s): D. Guo, S. Entani, S. Ikeda, K. Saiki
  • Journal Title: Chemical Physics Letters 429 Pages: 124-128
• [Journal Article] Electron spectroscopy of dye-sensitized anatase (001) surfaces under illumination (2006)
  • Author(s): T. Shimada, T. Kaji, and K. Saiki
  • Journal Title: Molecular Crystals and Liquid Crystals 455 Pages: 317-325
• [Journal Article] Thickness dependent characteristics of a copper phthalocyanine thin-film transistor investigated by in situ FET measurement system (2006)
  • Author(s): S. Ikeda, H. Yamakawa, M. Kiguchi, M. Nakayama, K. Saiki, T. Shimada, T. Miyadera, K. Tsutsui, Y. Wada
  • Journal Title: Molecular Crystals and Liquid Crystals 455 Pages: 347-351
• [Journal Article] Pentacene films grown on surface treated SiO_2 substrates (2006)
  • Author(s): D. Guo, S. Ikeda, K. Saiki
  • Journal Title: Thin Solid Films 515 Pages: 814-817
• [Journal Article] Topological analysis of the quantum Hall effect in graphene・・・Dirac-Fermi transition across van Hove singularities and the edge vs bulk quantum numbers (2006)
  • Author(s): Y. Hatsugai, T. Fukui, and H. Aoki
  • Journal Title: Physical Review B 74 Pages: 205414(16)
• [Journal Article] Pulsed-molecular beam scattering of a planar-shaped organic molecule on regularly stepped surfaces of hydrogen terminated Si (111) (2006)
  • Author(s): T. Shimada, H. Ichikawa, K. Saiki
  • Journal Title: Applied Physics Letters 89 Pages: 141912.(3)
• [Journal Article] Analysis of transient phenomena of C_<60> field effect transistors (2006)
  • Author(s): T. Miyadera, M. Nakayama, K. Saiki
  • Journal Title: Applied Physics Letters 89 Pages: 172117.(3)
• [Book] 表面物性工学ハンドブック 第2版, 「電子エネルギー損失分光」 (2007)
  • Author(s): 斉木 幸一朗 (分担執筆)
  • Publisher: 丸善