研究者データベース

藤沢 潤一
フジサワ ジュンイチ
分子科学部門
准教授
Last Updated :2022/06/07

研究者基本情報

研究者

  • 氏名

    藤沢 潤一, フジサワ ジュンイチ

基本情報

  • 研究者氏名(日本語)

    藤沢, 潤一
  • 研究者氏名(カナ)

    フジサワ, ジュンイチ

論文上での記載著者名

  • JI FUJISAWA

所属

  • 群馬大学, 助教授・准教授
  • 群馬大学, 分子科学部門, 准教授

学歴

  • 1995年04月, 1999年03月, 東北大学, 大学院理科学研究科化学専攻
  • 1990年04月, 1994年03月, 東北大学, 理学部, 化学科

学位

  • 博士(理学)
  • 博士(理学)

経歴

  • 2015年01月, 群馬大学
  • 2001年04月, 2006年09月, 理化学研究所
  • 2006年10月, 2014年12月, 東京大学
  • 1999年04月, 2000年03月, ローレンス・バークレー国立研究所

研究活動情報

研究分野

  • ナノテク・材料, 機能物性化学
  • ナノテク・材料, 無機・錯体化学
  • ナノテク・材料, 複合材料、界面

研究キーワード

  • 有機-無機複合物質
  • 光化学
  • 光エネルギー変換
  • 機能物質化学

論文

  • Aromatic-ring dependence of interfacial charge-transfer transitions between TiO2 nanoparticles and aromatic carboxylic acids, Jun-ichi Fujisawa, Shunsuke Kato, and Minoru Hanaya, 2022年02月16日, Chemical Physics Letters, 788, 139274
  • Interfacial Charge-Transfer Transitions between TiO2 Nanoparticles and Benzoic Acid Derivatives, Jun-ichi Fujisawa, Shunsuke Kato, and Minoru Hanaya, 2021年11月07日, The Journal of Physical Chemistry C, 125, 25075, 25086
  • Linkage Dependence of Interfacial Charge-Transfer Transitions in ZnO: Carboxylate versus Sulfur Linker, Jun-ichi Fujisawa and Minoru Hanaya, 2021年07月02日, The Journal of Physical Chemistry A, 125, 5903, 5910
  • Interfacial Charge-Transfer Transitions in TiO2 Nanoparticles Adsorbed with 4-Mercaptobenzenoic Acid: Carboxy versus Thiol Anchor and Adsorbate-to-TiO2 versus TiO2-to-Adsorbate Charge Transfer, Jun-ichi Fujisawa, Naohito Kaneko, and Minoru Hanaya, 2021年06月10日, J. Phys. Chem. C, 125, 24, 13534, 13541, 研究論文(学術雑誌)
  • Interfacial Charge-Transfer Transitions in SnO2 Functionalized with Benzoic Acid Derivatives, Jun-ichi Fujisawa and Minoru Hanaya, 2021年06月09日, RSC Advances, 11, 20725, 20729
  • Definitive Assignment and Mechanistic Study of Interfacial Charge-Transfer Transitions between ZnO and Benzenethiol, Jun-ichi Fujisawa, 2021年09月01日, Chem. Phys. Lett., 778, 138774, 研究論文(学術雑誌)
  • Immobilizing a π-Conjugated Catecholato Framework on Surfaces of SiO2 Insulator Films via a One-Atom Anchor of a Platinum Metal Center to Modulate Organic Transistor Performance, Keishiro Tahara; Yuya Ashihara; Takashi Ikeda; Tomofumi Kadoya; Jun-ichi Fujisawa; Yoshiki Ozawa; Hiroyuki Tajima; Noriaki Toyoda; Yuichi Haruyama; Masaaki Abe, 2020年11月10日, Inorganic Chemistry, 研究論文(学術雑誌)
  • Interfacial Charge-Transfer Transitions for Direct Charge-Separation Photovoltaics, Jun-ichi Fujisawa, 2020年05月15日, Energies, 13, 10, 2521, 2521, 研究論文(学術雑誌)
  • Formation of solid solutions in wide miscibility-gap perovskite-type oxide system of Ba1−xCaxZrO3 over the entire Ca composition range, Miho AKO; Jun-ichi FUJISAWA; Minoru HANAYA, 2020年02月01日, Journal of the Ceramic Society of Japan, 128, 2, 80, 83, 研究論文(学術雑誌)
  • Interfacial charge-transfer transitions between TiO2 and indole, Jun-ichi Fujisawa, 2020年01月, Chemical Physics Letters, 739, 136974, 136974, 研究論文(学術雑誌)
  • Interfacial charge-transfer transitions in ZnO induced exclusively by adsorption of aromatic thiols, Jun-ichi Fujisawa; Naohito Kaneko; Minoru Hanaya, 2020年, Chemical Communications, 56, 29, 4090, 4093, 研究論文(学術雑誌)
  • Formation of Ba1−Ca TiO3 solid solutions beyond the solubility limit by ‘sputter-anneal’ method, M. Ako, T. Kogure, Y. Kobayashi, T. Kyomen, J. Fujisawa, M. Hanaya, 2019年09月, Thermochimica Acta, 679, 178339, 178339, 研究論文(学術雑誌)
  • Photoinduced H-aggregation of cationic dyes on metal-oxide surfaces via light activated molecular migration, Jun-ichi Fujisawa; Karin Murai; Minoru Hanaya, 2019年, Chemical Communications, 55, 97, 14641, 14644, 研究論文(学術雑誌)
  • Visible-light circular dichroism of colourless chiral organic compounds enabled by interfacial charge-transfer transitions, Fujisawa Jun-ichi; Kaneko Naohito; Eda Takumi; Hanaya Minoru, 2018年08月07日, CHEMICAL COMMUNICATIONS, CHEMICAL COMMUNICATIONS, 54, 61, 8490, 8493, 研究論文(学術雑誌)
  • Inorganic Control of Interfacial Charge-Transfer Transitions in Catechol-Functionalized Titanium Oxides Using SrTiO3, BaTiO3, and TiO2, Eda Takumi; Fujisawa Jun-ichi; Hanaya Minoru, 2018年07月19日, JOURNAL OF PHYSICAL CHEMISTRY C, JOURNAL OF PHYSICAL CHEMISTRY C, 122, 28, 16216, 16220, 研究論文(学術雑誌)
  • Light Harvesting and Direct Electron Injection by Interfacial Charge-Transfer Transitions between TiO2 and Carboxy-Anchor Dye LEG4 in Dye-Sensitized Solar Cells, Jun-Ichi Fujisawa; Minoru Hanaya, 2018年01月11日, Journal of Physical Chemistry C, 122, 1, 8, 15, 研究論文(学術雑誌)
  • Comparative study of conduction-band and valence-band edges of TiO2, SrTiO3, and BaTiO3 by ionization potential measurements, Jun-ichi Fujisawa; Takumi Eda; Minoru Hanaya, 2017年10月, CHEMICAL PHYSICS LETTERS, 685, 23, 26, 研究論文(学術雑誌)
  • Light absorption and photoluminescence due to interfacial charge-transfer transitions in aromatic amine-functionalized silicon nanoparticles, Jun-ichi Fujisawa; Minoru Hanaya, 2017年09月, CHEMICAL PHYSICS LETTERS, 684, 285, 289, 研究論文(学術雑誌)
  • Visible-to-Near-IR Wide-Range Light Harvesting by Interfacial Charge-Transfer Transitions between TiO2 and p-Aminophenol and Evidence of Direct Electron Injection to the Conduction Band of TiO2, Jun-ichi Fujisawa; Takumi Eda; Giacomo Giorgi; Minoru Hanayat, 2017年08月, JOURNAL OF PHYSICAL CHEMISTRY C, 121, 34, 18710, 18716, 研究論文(学術雑誌)
  • Facile and Rapid Visualization of Colorless Endocrine Disruptor Bisphenol A by Interfacial Charge-Transfer Transitions with TiO2 Nanoparticles, Jun-ichi Fujisawa; Shingo Matsumura; Minoru Hanaya, 2017年07月, CHEMISTRYSELECT, 2, 21, 6097, 6099, 研究論文(学術雑誌)
  • Facile, quick and selective visible-light sensing of phenol-containing drug molecules acetaminophen and biosol by use of interfacial charge-transfer transitions with TiO2 nanoparticles, Jun-ichi Fujisawa; Takumi Eda; Minoru Hanaya, 2017年, Chemical Physics Letters, 684, 328, 332, 研究論文(学術雑誌)
  • Coloration of tyrosine by organic-semiconductor interfacial charge-transfer transitions, Jun-ichi Fujisawa; Natsumi Kikuchi; Minoru Hanaya, 2016年11月, CHEMICAL PHYSICS LETTERS, 664, 178, 183, 研究論文(学術雑誌)
  • Achievement of over 1.4 V photovoltage in a dye-sensitized solar cell by the application of a silyl-anchor coumarin dye, Kenji Kakiage; Hiroyuki Osada; Yohei Aoyama; Toru Yano; Keiji Oya; Shinji Iwamoto; Jun-ichi Fujisawa; Minoru Hanaya, 2016年10月, SCIENTIFIC REPORTS, 6, 研究論文(学術雑誌)
  • A Surface Nanocavity Structure of Bisphenol P on TiO2 Showing Interfacial Charge-Transfer Absorption, Jun-ichi Fujisawa; Shingo Matsumura; Minoru Hanaya, 2016年10月, CHEMISTRYSELECT, 1, 17, 5590, 5593, 研究論文(学術雑誌)
  • Interfacial Charge-Transfer Transitions in BaTiO3 Nanoparticles Adsorbed with Catechol, Jun-ichi Fujisawa; Takumi Eda; Minoru Hanaya, 2016年09月, JOURNAL OF PHYSICAL CHEMISTRY C, 120, 38, 21162, 21168, 研究論文(学術雑誌)
  • Interfacial charge-transfer transitions and reorganization energies in sulfur-bridged TiO2-x-benzenedithiol complexes (x: o, m, p), Jun-ichi Fujisawa; Ryuki Muroga; Minoru Hanaya, 2016年08月, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 18, 32, 22286, 22292, 研究論文(学術雑誌)
  • A strategy to minimize the energy offset in carrier injection from excited dyes to inorganic semiconductors for efficient dye-sensitized solar energy conversion, Jun-ichi Fujisawa; Ayumi Osawa; Minoru Hanaya, 2016年08月, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 18, 32, 22244, 22253, 研究論文(学術雑誌)
  • A single Ti-O-C linkage induces interfacial charge-transfer transitions between TiO2 and a pi-conjugated molecule, Jun-ichi Fujisawa; Shingo Matsumura; Minoru Hanaya, 2016年07月, CHEMICAL PHYSICS LETTERS, 657, 172, 176, 研究論文(学術雑誌)
  • Electronic structures of TiO2-TCNE, -TCNQ, and-2,6-TCNAQ surface complexes studied by ionization potential measurements and DFT calculations: Mechanism of the shift of interfacial charge-transfer bands, Jun-ichi Fujisawa; Minoru Hanaya, 2016年06月, CHEMICAL PHYSICS LETTERS, 653, 11, 16, 研究論文(学術雑誌)
  • Highly-selective absorption control in photosynthetic chlorin dyes, Jun-ichi Fujisawa, 2015年04月, JOURNAL OF PORPHYRINS AND PHTHALOCYANINES, 19, 4, 601, 609, 研究論文(学術雑誌)
  • Organic-Inorganic Hybrid Lead Iodide Perovskite Featuring Zero Dipole Moment Guanidinium Cations: A Theoretical Analysis, Giacomo Giorgi; Jun-Ichi Fujisawa; Hiroshi Segawa; Koichi Yamashita, 2015年03月, JOURNAL OF PHYSICAL CHEMISTRY C, 119, 9, 4694, 4701, 研究論文(学術雑誌)
  • Efficient light-to-current conversion by organic-inorganic interfacial charge-transfer transitions in TiO2 chemically adsorbed with 2-anthroic acid, Jun-ichi Fujisawa; Morio Nagata, 2015年01月, CHEMICAL PHYSICS LETTERS, 619, 180, 184, 研究論文(学術雑誌)
  • Highly-efficient dye-sensitized solar cells with collaborative sensitization by silyl-anchor and carboxy-anchor dyes, Kenji Kakiage; Yohei Aoyama; Toru Yano; Keiji Oya; Jun-ichi Fujisawa; Minoru Hanaya, 2015年, CHEMICAL COMMUNICATIONS, 51, 88, 15894, 15897, 研究論文(学術雑誌)
  • Extremely strong organic-metal oxide electronic coupling caused by nucleophilic addition reaction, Jun-ichi Fujisawa; Minoru Hanaya, 2015年, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 17, 25, 16285, 16293, 研究論文(学術雑誌)
  • Interfacial charge-transfer transitions in a TiO2-benzenedithiol complex with Ti-S-C linkages, Jun-ichi Fujisawa; Ryuki Muroga; Minoru Hanaya, 2015年, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 17, 44, 29867, 29873, 研究論文(学術雑誌)
  • Visible light absorption and photoelectrochemical activity of colorless molecular 1,3-bis(dicyanomethylidene)indane (BDMI) by surface complexation on TiO2, Soo-Byung Ko; Tae In Ryu; An-Na Cho; Junichi Fujisawa; Hiroshi Segawa; Nam-Gyu Park, 2015年, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 17, 28, 18541, 18546, 研究論文(学術雑誌)
  • Large impact of reorganization energy on photovoltaic conversion due to interfacial charge-transfer transitions, Jun-ichi Fujisawa, 2015年, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 17, 18, 12228, 12237, 研究論文(学術雑誌)
  • Charge-transfer complex versus sigma-complex formed between TiO2 and bis(dicyanomethylene) electron acceptors, Jun-ichi Fujisawa; Morio Nagata; Minoru Hanaya, 2015年, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 17, 41, 27343, 27356, 研究論文(学術雑誌)
  • Structural and electronic properties featuring ambipolar transport in methylammonium lead iodide perovskite: A DFT analysis, Giacomo Giorgi; Jun-ichi Fujisawa; Hiroshi Segawa; Koichi Yamashita, 2014年08月, ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, 248
  • Lead-iodide nanowire perovskite with methylviologen showing interfacial charge-transfer absorption: A DFT analysis, Jun-ichi Fujisawa; Giacomo Giorgi, 2014年07月30日, Physical Chemistry Chemical Physics, 16, 33, 17955, 17959, 研究論文(学術雑誌)
  • An unusual mechanism for HOMO-LUMO gap narrowing in a minimal near-IR dye generated by the deprotonation of bis(dicyanomethylene)indan, Jun-ichi Fujisawa, 2014年07月, CHEMICAL PHYSICS LETTERS, 608, 355, 359, 研究論文(学術雑誌)
  • Cation Role in Structural and Electronic Properties of 3D Organic-Inorganic Halide Perovskites: A DFT Analysis, Giacomo Giorgi; Jun-Ichi Fujisawa; Hiroshi Segawa; Koichi Yamashita, 2014年06月, JOURNAL OF PHYSICAL CHEMISTRY C, 118, 23, 12176, 12183, 研究論文(学術雑誌)
  • Mechanisms of large red-shift and intensity enhancement of absorption bands by pi-bond breaking in a benzoporphyrin sensitizer for photodynamic therapy, Jun-ichi Fujisawa; Kazutaka Hirakawa, 2014年06月, JOURNAL OF PORPHYRINS AND PHTHALOCYANINES, 18, 6, 513, 518, 研究論文(学術雑誌)
  • Small photocarrier effective masses featuring ambipolar transport in methylammonium lead iodide perovskite: A density functional analysis, Giacomo Giorgi; Jun-Ichi Fujisawa; Hiroshi Segawa; Koichi Yamashita, 2013年12月19日, Journal of Physical Chemistry Letters, 4, 24, 4213, 4216, 研究論文(学術雑誌)
  • Unraveling the adsorption mechanism of aromatic and aliphatic diols on the TiO2 surface: a density functional theory analysis, Giacomo Giorgi; Jun-ichi Fujisawa; Hiroshi Segawa; Koichi Yamashita, 2013年, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 15, 24, 9761, 9767, 研究論文(学術雑誌)
  • The origin of the strong interfacial charge-transfer absorption in the surface complex between TiO2 and dicyanomethylene compounds, Ryota Jono; Jun-ichi Fujisawa; Hiroshi Segawa; Koichi Yamashita, 2013年, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 15, 42, 18584, 18588, 研究論文(学術雑誌)
  • Visible to Near-Infrared Photoelectric Conversion in a Dye-Sensitized Solar Cell Using Ru(II) Porphyrin with Azopyridine Axial Ligands, Takumi Kinoshita; Jun-ichi Fujisawa; Jotaro Nakazaki; Satoshi Uchida; Takaya Kubo; Hiroshi Segawa, 2012年10月, JAPANESE JOURNAL OF APPLIED PHYSICS, 51, 10, 研究論文(学術雑誌)
  • Isotopic Substitution as a Strategy to Control Non-Adiabatic Dynamics in Photoelectrochemical Cells: Surface Complexes between TiO2 and Dicyanomethylene Compounds, Sergei Manzhos; Jun-ichi Fujisawa; Hiroshi Segawa; Koichi Yamashita, 2012年10月, JAPANESE JOURNAL OF APPLIED PHYSICS, 51, 10, 研究論文(学術雑誌)
  • Enhancement of Near-IR Photoelectric Conversion in Dye-Sensitized Solar Cells Using an Osmium Sensitizer with Strong Spin-Forbidden Transition, Takumi Kinoshita; Jun-ichi Fujisawa; Jotaro Nakazaki; Satoshi Uchida; Takaya Kubo; Hiroshi Segawa, 2012年02月, JOURNAL OF PHYSICAL CHEMISTRY LETTERS, 3, 3, 394, 398, 研究論文(学術雑誌)
  • Study of Interfacial Charge Transfer Bands and Electron Recombination in the Surface Complexes of TCNE, TCNQ, and TCNAQ with TiO2, Sergei Manzhos; Ryota Jono; Koichi Yamashita; Jun-ichi Fujisawa; Morio Nagata; Hiroshi Segawa, 2011年11月, JOURNAL OF PHYSICAL CHEMISTRY C, 115, 43, 21487, 21493, 研究論文(学術雑誌)
  • Theoretical Study of the Surface Complex between TiO2 and TCNQ Showing Interfacial Charge-Transfer Transitions, Jono Ryota; Fujisawa Jun-ichi; Segawa Hiroshi; Yamashita Koichi, 2011年05月19日, JOURNAL OF PHYSICAL CHEMISTRY LETTERS, JOURNAL OF PHYSICAL CHEMISTRY LETTERS, 2, 10, 1167, 1170
  • Electronic interactions between inorganic nanowires and organic electron acceptors: Drastic changes in optical response and molecular vibration, Jun-ichi Fujisawa; Naoya Tajima; Koichi Tamaki; Masatsugu Shimomura; Teruya Ishihara, 2007年01月, JOURNAL OF PHYSICAL CHEMISTRY C, 111, 3, 1146, 1149, 研究論文(学術雑誌)
  • Nonlinear luminescence from an inorganic-organic layered semiconductor, Makoto Shimizu; Jun-ichi Fujisawa; Teruya Ishihara, 2007年01月, JOURNAL OF LUMINESCENCE, 122, 485, 487, 研究論文(学術雑誌)
  • Photoluminescence of the inorganic-organic layered semiconductor (C6H5C2H4NH3)(2)PbI4: Observation of triexciton formation, Makoto Shimizu; Jun-ichi Fujisawa; Teruya Ishihara, 2006年10月, PHYSICAL REVIEW B, 74, 15, 研究論文(学術雑誌)
  • Photoconductivity induced by wire-to-spacer charge-transfer transitions in an inorganic-organic hybrid quasi-one-dimensional crystal: Polaron excitation in the Urbach tail, J Fujisawa; N Tajima, 2005年09月, PHYSICAL REVIEW B, 72, 12, 研究論文(学術雑誌)
  • Photo-induced insulator-metal transition in an organic conductor alpha-(BEDT-TTF)(2)I-3, N Tajima; J Fujisawa; N Naka; T Ishihara; R Kato; Y Nishio; K Kajita, 2005年02月, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 74, 2, 511, 514, 研究論文(学術雑誌)
  • Excitons and biexcitons bound to a positive ion in a bismuth-doped inorganic-organic layered lead iodide semiconductor (vol B 70, art no 205330, 2004), J Fujisawa; T Ishihara, 2005年01月, PHYSICAL REVIEW B, 71, 4
  • Excitons and biexcitons bound to a positive ion in a bismuth-doped inorganic-organic layered lead iodide semiconductor, J Fujisawa; T Ishihara, 2004年11月, PHYSICAL REVIEW B, 70, 20, 研究論文(学術雑誌)
  • Charge-transfer transitions between wires and spacers in an inorganic-organic quasi-one-dimensional crystal methylviologen lead iodide, J Fujisawa; T Ishihara, 2004年09月, PHYSICAL REVIEW B, 70, 11, 研究論文(学術雑誌)
  • Exciton-exciton interaction in an inorganic-organic layered semiconductor, (C6H5C2H4NH3)(2)PbI4, M Shimizu; J Fujisawa, 2004年06月, JOURNAL OF LUMINESCENCE, 108, 1-4, 189, 194, 研究論文(学術雑誌)
  • Excited quartet and doublet states in the complex of tetraphenylporphine zinc (II) and a nitroxide radical in solution: X- and W-band time-resolved EPR studies, J Fujisawa; Y Iwasaki; Y Ohba; S Yamauchi; N Koga; S Karasawa; M Fuhs; K Mobius; S Weber, 2001年, APPLIED MAGNETIC RESONANCE, 21, 3-4, 483, 493, 研究論文(学術雑誌)
  • BEARS: radioactive ion beams at Berkeley, J Powell; R Joosten; CA Donahue; RF Fairchild; J Fujisawa; FQ Guo; PE Haustein; RM Larimer; CM Lyneis; MA McMahan; DM Moltz; EB Norman; JP O'Neil; MA Ostas; MW Rowe; HF VanBrocklin; D Wutte; ZQ Xie; XJ Xu; J Cerny, 2000年12月, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 455, 2, 452, 459, 研究論文(学術雑誌)
  • A study of electron spin polarization transfer in a system of photo-excited triplet phthalocyanine and a nitroxide radical, ISM Saiful; J Fujisawa; N Kobayashi; Y Ohba; S Yamauchi, 1999年04月, BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN, 72, 4, 661, 667, 研究論文(学術雑誌)
  • First observation of the excited doublet state of a radical-triplet pair in solution: W-band high-field time-resolved electron paramagnetic resonance spectroscopy (vol 103, pg 215, 1999), J Fujisawa; K Ishii; Y Ohba; S Yamauchi; M Fuhs; K Mobius, 1999年04月, JOURNAL OF PHYSICAL CHEMISTRY A, 103, 16, 3138, 3138
  • First observation of the excited doublet state of a radical-triplet pair in solution: W-Band high-field time-resolved electron paramagnetic resonance spectroscopy, J Fujisawa; K Ishii; Y Ohba; S Yamauchi; M Fuhs; K Mobius, 1999年01月, JOURNAL OF PHYSICAL CHEMISTRY A, 103, 2, 213, 216
  • Pulsed and cw-time-resolved EPR studies of photoinduced electron transfer between zinc(II) porphyrin and fullerene, J Fujisawa; Y Ohba; S Yamauchi, 1998年09月, CHEMICAL PHYSICS LETTERS, 294, 1-3, 248, 254, 研究論文(学術雑誌)
  • General simulations of excited quartet spectra with electron-spin polarizations: The excited multiplet states of (Tetraphenylporphinato)zinc(II) coordinated by p- or m-pyridyl nitronyl nitroxides, K Ishii; J Fujisawa; A Adachi; S Yamauchi; N Kobayashi, 1998年04月, JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 120, 13, 3152, 3158, 研究論文(学術雑誌)
  • Direct observation of electron spin polarization transfer in triplet-triplet energy transfer between porphyrins and fullerene in fluid solution, J Fujisawa; Y Ohba; S Yamauchi, 1998年01月, CHEMICAL PHYSICS LETTERS, 282, 2, 181, 186, 研究論文(学術雑誌)
  • A time-resolved electron paramagnetic resonance study of excited triplet porphyrins in fluid solution, J Fujisawa; Y Ohba; S Yamauchi, 1997年09月, JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 119, 37, 8736, 8737, 研究論文(学術雑誌)
  • X- and W-band time-resolved electron paramagnetic resonance studies on radical-excited triplet pairs between metalloporphyrins and axial-ligating nitroxide radicals, Jun-Ichi Fujisawa; Kazuyuki Ishii; Yasunori Ohba; Seigo Yamauchi; Michael Fuhs; Klaus Möbius, 1997年08月14日, Journal of Physical Chemistry A, 101, 33, 5869, 5876, 研究論文(学術雑誌)
  • Electron-spin polarizations generated from interactions between excited triplet porphyrins and stable radicals studied by time-resolved electron paramagnetic resonance, J Fujisawa; Y Ohba; S Yamauchi, 1997年01月, JOURNAL OF PHYSICAL CHEMISTRY A, 101, 4, 434, 439, 研究論文(学術雑誌)
  • A time-resolved electron paramagnetic resonance study on the excited states of tetraphenylporphinatozinc(II) coordinated by p-pyridyl nitronyl nitroxide, K Ishii; J Fujisawa; Y Ohba; S Yamauchi, 1996年12月, JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 118, 51, 13079, 13080, 研究論文(学術雑誌)
  • ELECTRON-SPIN POLARIZATION TRANSFER FROM EXCITED TRIPLET PORPHYRINS TO A NITROXIDE RADICAL VIA A SPIN-EXCHANGE MECHANISM, JI FUJISAWA; K ISHII; Y OHBA; M IWAIZUMI; S YAMAUCHI, 1995年11月, JOURNAL OF PHYSICAL CHEMISTRY, 99, 47, 17082, 17084
  • Organo-Rhodium Complex with Tridentate Biradical Ligand, [Rh(Cp*)(bisnitpy)](PF6)2, Chem. Lett. 1994, 2353-2356., Chem. Lett. 1994, 2353-2356.
  • Interfacial charge-transfer transitions in ZnO induced exclusively by adsorption of aromatic thiols., Fujisawa Jun-Ichi;Kaneko Naohito;Hanaya Minoru, Chemical communications (Cambridge, England), Chemical communications (Cambridge, England), 56, 29

MISC

  • Highly-efficient dye-sensitized solar cells with collaborative sensitization by silyl-anchor and carboxy-anchor dyes, Kenji Kakiage; Yohei Aoyama; Toru Yano; Keiji Oya; Jun-ichi Fujisawa; Minoru Hanaya, 2015年, CHEMICAL COMMUNICATIONS, 51, 88, 15894, 15897
  • Highly-efficient dye-sensitized solar cells with collaborative sensitization by silyl-anchor and carboxy-anchor dyes, Kenji Kakiage; Yohei Aoyama; Toru Yano; Keiji Oya; Jun-ichi Fujisawa; Minoru Hanaya, 2015年, CHEMICAL COMMUNICATIONS, 51, 88, 15894, 15897
  • Efficient light-to-current conversion by organic-inorganic interfacial charge-transfer transitions in TiO2 chemically adsorbed with 2-anthroic acid, Jun-ichi Fujisawa; Morio Nagata, 2015年01月, CHEMICAL PHYSICS LETTERS, 619, 5, 180, 184
  • Interfacial charge-transfer transitions in a TiO2-benzenedithiol complex with Ti-S-C linkages, Jun-ichi Fujisawa; Ryuki Muroga; Minoru Hanaya, 2015年, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 17, 44, 29867, 29873
  • Visible light absorption and photoelectrochemical activity of colorless molecular 1,3-bis(dicyanomethylidene)indane (BDMI) by surface complexation on TiO2, Soo-Byung Ko; Tae In Ryu; An-Na Cho; Junichi Fujisawa; Hiroshi Segawa; Nam-Gyu Park, 2015年, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 17, 28, 18541, 18546
  • Visible light absorption and photoelectrochemical activity of colorless molecular 1,3-bis(dicyanomethylidene)indane (BDMI) by surface complexation on TiO2, Soo-Byung Ko; Tae In Ryu; An-Na Cho; Junichi Fujisawa; Hiroshi Segawa; Nam-Gyu Park, 2015年, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 17, 28, 18541, 18546
  • Organic-Inorganic Hybrid Lead Iodide Perovskite Featuring Zero Dipole Moment Guanidinium Cations: A Theoretical Analysis, Giacomo Giorgi; Jun-Ichi Fujisawa; Hiroshi Segawa; Koichi Yamashita, 2015年03月, JOURNAL OF PHYSICAL CHEMISTRY C, 119, 9, 4694, 4701
  • Organic-Inorganic Hybrid Lead Iodide Perovskite Featuring Zero Dipole Moment Guanidinium Cations: A Theoretical Analysis, Giacomo Giorgi; Jun-Ichi Fujisawa; Hiroshi Segawa; Koichi Yamashita, 2015年03月, JOURNAL OF PHYSICAL CHEMISTRY C, 119, 9, 4694, 4701
  • Charge-transfer complex versus sigma-complex formed between TiO2 and bis(dicyanomethylene) electron acceptors, Jun-ichi Fujisawa; Morio Nagata; Minoru Hanaya, 2015年, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 17, 41, 27343, 27356
  • Unraveling the adsorption mechanism of aromatic and aliphatic diols on the TiO2 surface: a density functional theory analysis, Giacomo Giorgi; Jun-ichi Fujisawa; Hiroshi Segawa; Koichi Yamashita, 2013年, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 15, 24, 9761, 9767
  • Unraveling the adsorption mechanism of aromatic and aliphatic diols on the TiO2 surface: a density functional theory analysis, Giacomo Giorgi; Jun-ichi Fujisawa; Hiroshi Segawa; Koichi Yamashita, 2013年, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 15, 24, 9761, 9767
  • The origin of the strong interfacial charge-transfer absorption in the surface complex between TiO2 and dicyanomethylene compounds, Ryota Jono; Jun-ichi Fujisawa; Hiroshi Segawa; Koichi Yamashita, 2013年, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 15, 42, 18584, 18588
  • The origin of the strong interfacial charge-transfer absorption in the surface complex between TiO2 and dicyanomethylene compounds, Ryota Jono; Jun-ichi Fujisawa; Hiroshi Segawa; Koichi Yamashita, 2013年, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 15, 42, 18584, 18588
  • Achievement of over 1.4 V photovoltage in a dye-sensitized solar cell by the application of a silyl-anchor coumarin dye, Kenji Kakiage; Hiroyuki Osada; Yohei Aoyama; Toru Yano; Keiji Oya; Shinji Iwamoto; Jun-ichi Fujisawa; Minoru Hanaya, 2016年10月, SCIENTIFIC REPORTS, 6, 35888
  • Achievement of over 1.4 V photovoltage in a dye-sensitized solar cell by the application of a silyl-anchor coumarin dye, Kenji Kakiage; Hiroyuki Osada; Yohei Aoyama; Toru Yano; Keiji Oya; Shinji Iwamoto; Jun-ichi Fujisawa; Minoru Hanaya, 2016年10月, SCIENTIFIC REPORTS, 6, 35888
  • Interfacial charge-transfer transitions and reorganization energies in sulfur-bridged TiO2-x-benzenedithiol complexes (x: o, m, p), Jun-ichi Fujisawa; Ryuki Muroga; Minoru Hanaya, 2016年08月, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 18, 32, 22286, 22292
  • A Surface Nanocavity Structure of Bisphenol P on TiO2 Showing Interfacial Charge-Transfer Absorption, Jun-ichi Fujisawa; Shingo Matsumura; Minoru Hanaya, 2016年10月, CHEMISTRYSELECT, 1, 17, 5590, 5593
  • A single Ti-O-C linkage induces interfacial charge-transfer transitions between TiO2 and a pi-conjugated molecule, Jun-ichi Fujisawa; Shingo Matsumura; Minoru Hanaya, 2016年07月, CHEMICAL PHYSICS LETTERS, 657, 172, 176
  • Coloration of tyrosine by organic-semiconductor interfacial charge-transfer transitions, Jun-ichi Fujisawa; Natsumi Kikuchi; Minoru Hanaya, 2016年11月, CHEMICAL PHYSICS LETTERS, 664, 178, 183
  • A strategy to minimize the energy offset in carrier injection from excited dyes to inorganic semiconductors for efficient dye-sensitized solar energy conversion, Jun-ichi Fujisawa; Ayumi Osawa; Minoru Hanaya, 2016年08月, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 18, 32, 22244, 22253
  • Cation Role in Structural and Electronic Properties of 3D Organic-Inorganic Halide Perovskites: A DFT Analysis, Giacomo Giorgi; Jun-Ichi Fujisawa; Hiroshi Segawa; Koichi Yamashita, 2014年06月, JOURNAL OF PHYSICAL CHEMISTRY C, 118, 23, 12176, 12183
  • Cation Role in Structural and Electronic Properties of 3D Organic-Inorganic Halide Perovskites: A DFT Analysis, Giacomo Giorgi; Jun-Ichi Fujisawa; Hiroshi Segawa; Koichi Yamashita, 2014年06月, JOURNAL OF PHYSICAL CHEMISTRY C, 118, 23, 12176, 12183
  • Lead-iodide nanowire perovskite with methylviologen showing interfacial charge-transfer absorption: a DFT analysis, Jun-ichi Fujisawa; Giacomo Giorgi, 2014年09月, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 16, 33, 17955, 17959
  • Lead-iodide nanowire perovskite with methylviologen showing interfacial charge-transfer absorption: a DFT analysis, Jun-ichi Fujisawa; Giacomo Giorgi, 2014年09月, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 16, 33, 17955, 17959
  • Mechanisms of large red-shift and intensity enhancement of absorption bands by pi-bond breaking in a benzoporphyrin sensitizer for photodynamic therapy, Jun-ichi Fujisawa; Kazutaka Hirakawa, 2014年06月, JOURNAL OF PORPHYRINS AND PHTHALOCYANINES, 18, 6, 513, 518
  • Facile, quick and selective visible-light sensing of phenol-containing drug molecules acetaminophen and biosol by use of interfacial charge-transfer transitions with TiO2 nanoparticles, Jun-ichi Fujisawa; Takumi Eda; Minoru Hanaya, 2017年09月, CHEMICAL PHYSICS LETTERS, 684, 328, 332
  • Facile, quick and selective visible-light sensing of phenol-containing drug molecules acetaminophen and biosol by use of interfacial charge-transfer transitions with TiO2 nanoparticles, Jun-ichi Fujisawa; Takumi Eda; Minoru Hanaya, 2017年09月, CHEMICAL PHYSICS LETTERS, 684, 328, 332
  • Visible-to-Near-IR Wide-Range Light Harvesting by Interfacial Charge-Transfer Transitions between TiO2 and p-Aminophenol and Evidence of Direct Electron Injection to the Conduction Band of TiO2, Jun-ichi Fujisawa; Takumi Eda; Giacomo Giorgi; Minoru Hanayat, 2017年08月, JOURNAL OF PHYSICAL CHEMISTRY C, 121, 34, 18710, 18716
  • Visible-to-Near-IR Wide-Range Light Harvesting by Interfacial Charge-Transfer Transitions between TiO2 and p-Aminophenol and Evidence of Direct Electron Injection to the Conduction Band of TiO2, Jun-ichi Fujisawa; Takumi Eda; Giacomo Giorgi; Minoru Hanayat, 2017年08月, JOURNAL OF PHYSICAL CHEMISTRY C, 121, 34, 18710, 18716
  • Facile and Rapid Visualization of Colorless Endocrine Disruptor Bisphenol A by Interfacial Charge-Transfer Transitions with TiO2 Nanoparticles, Jun-ichi Fujisawa; Shingo Matsumura; Minoru Hanaya, 2017年07月, CHEMISTRYSELECT, 2, 21, 6097, 6099
  • Light Harvesting and Direct Electron Injection by Interfacial Charge-Transfer Transitions between TiO2 and Carboxy-Anchor Dye LEG4 in Dye-Sensitized Solar Cells, Fujisawa, Jun-ichi; Hanaya, Minoru, 2018年, JOURNAL OF PHYSICAL CHEMISTRY C, 122, 1, 8-15.
  • Comparative study of conduction-band and valence-band edges of TiO2, SrTiO3, and BaTiO3 by ionization potential measurements, Fujisawa, Jun-ichi; Eda, Takumi; Hanaya, Minoru, 2017年, CHEMICAL PHYSICS LETTERS, 685, 23, 26
  • Light absorption and photoluminescence due to interfacial charge-transfer transitions in aromatic amine-functionalized silicon nanoparticles, Fujisawa, Jun-ichi; Hanaya, Minoru, 2017年, CHEMICAL PHYSICS LETTERS, 684, 285, 289
  • Facile and Rapid Visualization of Colorless Endocrine Disruptor Bisphenol A by Interfacial Charge-Transfer Transitions with TiO2 Nanoparticles, Jun-Ichi Fujisawa; Shingo Matsumura; Minoru Hanaya, 2017年, ChemistrySelect, 2, 21, 6097, 6099
  • Coloration of tyrosine by organic-semiconductor interfacial charge-transfer transitions, Jun-ichi Fujisawa; Natsumi Kikuchi; Minoru Hanaya, 2016年11月01日, Chemical Physics Letters, 664, 178, 183
  • A Surface Nanocavity Structure of Bisphenol P on TiO2 Showing Interfacial Charge-Transfer Absorption, Jun-Ichi Fujisawa; Shingo Matsumura; Minoru Hanaya, 2016年, ChemistrySelect, 1, 17, 5590, 5593
  • Interfacial Charge-Transfer Transitions in BaTiO3 Nanoparticles Adsorbed with Catechol, Fujisawa, Jun-ichi; Eda, Takumi; Hanaya, Minoru, 2016年, JOURNAL OF PHYSICAL CHEMISTRY C, 120, 38, 21162, 21168
  • A strategy to minimize the energy offset in carrier injection from excited dyes to inorganic semiconductors for efficient dye-sensitized solar energy conversion, Jun-Ichi Fujisawa; Ayumi Osawa; Minoru Hanaya, 2016年, Physical Chemistry Chemical Physics, 18, 32, 22244, 22253
  • A single Ti-O-C linkage induces interfacial charge-transfer transitions between TiO2 and a pi-conjugated molecule, Fujisawa, Jun-ichi; Matsumura, Shingo; Hanaya, Minoru, 2016年, CHEMICAL PHYSICS LETTERS, 657, 172, 176
  • Electronic structures of TiO2-TCNE, -TCNQ, and-2,6-TCNAQ surface complexes studied by ionization potential measurements and DFT calculations: Mechanism of the shift of interfacial charge-transfer bands, Fujisawa, Jun-ichi; Hanaya, Minoru, 2016年, CHEMICAL PHYSICS LETTERS, 653, 11-16.
  • Extremely strong organic-metal oxide electronic coupling caused by nucleophilic addition reaction, Jun-Ichi Fujisawa; Minoru Hanaya, 2015年07月07日, Physical Chemistry Chemical Physics, 17, 25, 16285, 16293
  • Large impact of reorganization energy on photovoltaic conversion due to interfacial charge-transfer transitions, Fujisawa, Jun-ichi, 2015年, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 17, 18, 12228, 12237
  • Highly-selective absorption control in photosynthetic chlorin dyes, Fujisawa, Jun-ichi, 2015年, JOURNAL OF PORPHYRINS AND PHTHALOCYANINES, 19, 4, 601, 609
  • An unusual mechanism for HOMO-LUMO gap narrowing in a minimal near-IR dye generated by the deprotonation of bis(dicyanomethylene)indan, Fujisawa, Jun-ichi, 2014年, CHEMICAL PHYSICS LETTERS, 608, 21, 355, 359
  • Uncovering the mechanism for selective control of the visible and near-IR absorption bands in bacteriochlorophylls a, b and g, Jun-Ichi Fujisawa; Morio Nagata, 2014年, Biophysics (Japan), 10, 25, 34
  • Small photocarrier effective masses featuring ambipolar transport in methylammonium lead iodide perovskite: A density functional analysis, Giacomo Giorgi; Jun-Ichi Fujisawa; Hiroshi Segawa; Koichi Yamashita, 2013年12月19日, Journal of Physical Chemistry Letters, 4, 24, 4213, 4216
  • Light Harvesting and Direct Electron Injection by Interfacial Charge-Transfer Transitions between TiO2 and Carboxy-Anchor Dye LEG4 in Dye-Sensitized Solar Cells, Fujisawa, Jun-ichi; Hanaya, Minoru, 2018年, JOURNAL OF PHYSICAL CHEMISTRY C, 122, 1, 8-15.
  • Comparative study of conduction-band and valence-band edges of TiO2, SrTiO3, and BaTiO3 by ionization potential measurements, Jun-ichi Fujisawa; Takumi Eda; Minoru Hanaya, 2017年, Chemical Physics Letters, 685, 23, 26
  • Light absorption and photoluminescence due to interfacial charge-transfer transitions in aromatic amine-functionalized silicon nanoparticles, Jun-ichi Fujisawa; Minoru Hanaya, 2017年, Chemical Physics Letters, 684, 285, 289
  • Interfacial Charge-Transfer Transitions in BaTiO3 Nanoparticles Adsorbed with Catechol, Jun-Ichi Fujisawa; Takumi Eda; Minoru Hanaya, 2016年09月29日, Journal of Physical Chemistry C, 120, 38, 21162, 21168
  • Interfacial charge-transfer transitions and reorganization energies in sulfur-bridged TiO2-x-benzenedithiol complexes (x:: O, m, p), Jun-Ichi Fujisawa; Ryuki Muroga; Minoru Hanaya, 2016年, Physical Chemistry Chemical Physics, 18, 32, 22286, 22292
  • Electronic structures of TiO2-TCNE, -TCNQ, and-2,6-TCNAQ surface complexes studied by ionization potential measurements and DFT calculations: Mechanism of the shift of interfacial charge-transfer bands, Fujisawa, Jun-ichi; Hanaya, Minoru, 2016年, CHEMICAL PHYSICS LETTERS, 653, 11-16.
  • Interfacial charge-transfer transitions in a TiO2-benzenedithiol complex with Ti-S-C linkages, Jun-Ichi Fujisawa; Ryuki Muroga; Minoru Hanaya, 2015年, Physical Chemistry Chemical Physics, 17, 44, 29867, 29873
  • Charge-transfer complex versus sigma-complex formed between TiO2 and bis(dicyanomethylene) electron acceptors, Fujisawa, Jun-ichi; Nagata, Morio; Hanaya, Minoru, 2015年, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 17, 41, 27343, 27356
  • Extremely strong organic-metal oxide electronic coupling caused by nucleophilic addition reaction, Jun-Ichi Fujisawa; Minoru Hanaya, 2015年07月07日, Physical Chemistry Chemical Physics, 17, 25, 16285, 16293
  • Large impact of reorganization energy on photovoltaic conversion due to interfacial charge-transfer transitions, Jun-Ichi Fujisawa, 2015年05月14日, Physical Chemistry Chemical Physics, 17, 18, 12228, 12237
  • Efficient light-to-current conversion by organic-inorganic interfacial charge-transfer transitions in TiO2 chemically adsorbed with 2-anthroic acid, Jun-Ichi Fujisawa; Morio Nagata, 2015年01月05日, Chemical Physics Letters, 619, 5, 180, 184
  • Highly-selective absorption control in photosynthetic chlorin dyes, Jun-Ichi Fujisawa, 2015年04月01日, Journal of Porphyrins and Phthalocyanines, 19, 4, 601, 609
  • An unusual mechanism for HOMO-LUMO gap narrowing in a minimal near-IR dye generated by the deprotonation of bis(dicyanomethylene)indan, Jun-Ichi Fujisawa, 2014年07月21日, Chemical Physics Letters, 608, 21, 355, 359
  • Mechanisms of large red-shift and intensity enhancement of absorption bands by π-bond breaking in a benzoporphyrin sensitizer for photodynamic therapy, Jun-Ichi Fujisawa; Kazutaka Hirakawa, 2014年, Journal of Porphyrins and Phthalocyanines, 18, 6, 513, 518
  • Uncovering the mechanism for selective control of the visible and near-IR absorption bands in bacteriochlorophylls a, b and g, Jun-Ichi Fujisawa; Morio Nagata, 2014年, Biophysics (Japan), 10, 25, 34
  • Small photocarrier effective masses featuring ambipolar transport in methylammonium lead iodide perovskite: A density functional analysis, Giacomo Giorgi; Jun-Ichi Fujisawa; Hiroshi Segawa; Koichi Yamashita, 2013年12月19日, Journal of Physical Chemistry Letters, 4, 24, 4213, 4216

講演・口頭発表等

  • 酸素/硫黄架橋SnO2錯体の構造・電子状態・光吸収特性, 加藤 俊介,花屋 実,藤沢 潤一, 令和3年度日本化学会群馬地区研究交流発表会, 2021年12月04日
  • 安息香酸誘導体を用いたTiO2ナノ粒子可視光応答化のための新規メカニズム, 加藤 俊介,花屋 実,藤沢 潤一, 令和3年度日本化学会群馬地区研究交流発表会, 2021年12月04日
  • TiO2ナノ粒子と安息香酸誘導体の有機ー無機複合物質における界面電荷移動遷移, 加藤 俊介,花屋 実,藤沢 潤一, 第11回CSJ 化学フェスタ2021, 2021年10月21日

受賞

  • 青葉理学振興会賞

共同研究・競争的資金等の研究課題

  • 無機-有機界面ナノ構造体を基盤とした新規機能の創出, Novel Functions in Organic-Inorganic Surface Nanostructures, 藤沢 潤一, Fujisawa Jun-ichi, 日本学術振興会, Japan Society for the Promotion of Science, 科学研究費助成事業 挑戦的萌芽研究, Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research, 挑戦的萌芽研究, Grant-in-Aid for Challenging Exploratory Research, 群馬大学, Gunma University, 2016年04月01日, 2018年03月31日, 種々の無機半導体ナノ粒子と有機化合物を用いて、強吸着領域(化学吸着)から弱吸着領域(物理吸着)までの幅広い吸着様式を有するナノ構造体形成について研究を行った。強吸着領域では、複数の化学吸着基をもつビスフェノール誘導体を用いて、TiO2表面でナノキャビティー構造の形成を実証した。このナノキャビティーは光照射により電荷分布が変化するという特徴をもつ。さらに、弱吸着領域では、メチレンブルーが光誘起分子移動によりSrTiO3表面でH会合体を形成することを明らかにした。これらの結果は、界面ナノ構造体構築のための新たな知見を与えるものである。, I have studied surface nanostructures of organic compounds on inorganic semiconductors and their functions using various inorganic semiconductor nanoparticles and organic compounds in a wide range from a strong adsorption regime (chemisorption) to a weak adsorption regime (physisorption). I found that bisphenol derivatives form nanocavity structures on TiO2 surfaces in a strong adsorption regime. The cavity nanostructures feature the photoinduced charge change due to interfacial charge-transfer transitions. In a weak adsorption regime, methylene blue forms H-aggregates on SrTiO3 surfaces due to photoinduced diffusion motion. The photoinduced molecular transfer occurs by one-cycle charge-distribution change in methylene blue due to electronic excitation and relaxation. These results provide new knowledge for the construction of surface nanostructures., 16K13969
  • 有機ケイ素コンセプトによる高性能色素増感太陽電池の開発, Development of High Performance Dye-sensitized Solar Cells by Organosilicon Concept, 花屋 実; 藤沢 潤一, Hanaya Minoru, 日本学術振興会, Japan Society for the Promotion of Science, 科学研究費助成事業 基盤研究(B), Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B), 基盤研究(B), Grant-in-Aid for Scientific Research (B), 群馬大学, Gunma University, 2015年04月01日, 2018年03月31日, 色素増感太陽電池は、次世代の太陽電池として期待を集めるクリーンエネルギーデバイスである。本研究では、金属酸化物との強固な結合形成能を有するアルコキシシラン色素の増感色素としての可能性に着目して、分子軌道計算による分子設計に基づき新規アルコキシシリルクマリン色素を開発し、色素増感太陽電池において世界最高となる1.45 Vの光起電圧を発生するセルの作製に成功した。さらに、二酸化チタン電極にアルコキシシリルカルバゾール色素とトリフェニルアミン系カルボン酸色素を共吸着させたセルにおいて、協調的光増感作用が発現することを見出し、14%を超える光電変換効率を達成した。, Dye-sensitized solar cells (DSSCs) have been investigated actively as practical photovoltaic cells of the next generation. We focused our attention on the potential of alkoxysilyl dyes as sensitizing dyes for DSSCs based on their high bonding ability to metal-oxide surfaces by forming firm Si-O-metal bonds, and developed a new alkoxysilyl coumarin dye with the help of MO calculations. The cell using the dye exhibited an open-circuit photovoltage over 1.4 V, which is the highest value reported so far for DSSCs. We also found that the cell with the TiO2 electrode co-adsorbed with an alkoxysilyl carbazole dye and a triphenyl amine carboxy dye shows the collaborative sensitization effect, and succeeded to develop the cell showing the light-to-electric conversion efficiency over 14%., 15H03848
  • 界面電荷移動遷移を新規動作原理に用いた次世代無機太陽電池の研究開発, Research and development of next-generation inorganic solar cells using interfacial charge-transfer transitions as a novel operating principle, 藤沢 潤一, Fujisawa Jun-ichi, 日本学術振興会, Japan Society for the Promotion of Science, 科学研究費助成事業 挑戦的萌芽研究, Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research, 挑戦的萌芽研究, Grant-in-Aid for Challenging Exploratory Research, 2013年04月01日, 2016年03月31日, 界面電荷移動遷移は、光吸収と同時に界面電荷分離が起こるため、エネルギー損失を伴わない直接的な電荷分離が可能である。本研究課題では、ワイドバンドギャップ半導体である酸化チタンナノ粒子に硫黄化合物を化学吸着させることで、酸化チタン表面に結合した硫黄原子から酸化チタン伝導帯への界面電荷移動遷移が可視域に発現することを見出した。さらに、この複合材料を太陽電池へ応用することで、界面電荷移動遷移により、内部量子収率が約60-70%程度の光電変換が起こることを明らかにした。本研究により、酸化チタンと硫黄化合物を組み合わせることで、界面電荷移動遷移を示す新たな複合材料を作製できることが示された。, Interfacial charge-transfer transitions enable direct photoinduced charge separation without loss of energy. In this work, we found that interfacial charge-transfer transitions take place from the surface-bound sulfur atoms on TiO2 to the conduction band of TiO2 in a TiO2-benzenedithiol surface complex. In addition, I applied this material to photovoltaic cells. We observed that photoelectric conversion occurs by the surfur-to-TiO2 interfacial charge-transfer transitions with an internal quantum efficiency of about 65%. This result reveals the possibility that a new hybrid material for ICT transitions can be produced by combining titanium dioxide with sulfur-containing compounds., 25620054
  • 酸化チタンとジシアノメチレン化合物の界面錯体を用いた新型有機系太陽電池の開発, 科学技術振興機構, 戦略的創造研究推進事業さきがけ, 2011年10月, 2015年02月
  • 酸化物半導体と有機分子間の界面電荷移動遷移に基づく光電変換デバイスの物性制御, Control of Photovoltaic Devices based on Interfacial Charge-Transfer Transitions between Metal Oxide Semiconductor and Organic Molecules, 藤沢 潤一, FUJISAWA Jun-ichi, 日本学術振興会, Japan Society for the Promotion of Science, 科学研究費助成事業 若手研究(B), Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B), 若手研究(B), Grant-in-Aid for Young Scientists (B), 東京大学, The University of Tokyo, 2010年, 2011年, TiO_2とジシアノメチレン化合物(TCNX)の界面錯体を用いた有機系太陽電池の高効率化を目的に、界面電荷移動吸収と電子移動過程の制御を行った。実験の結果、TCNQに電子供与性置換基であるメチル基を四つ導入することで、吸収波長領域を約900nmの近赤外領域まで拡張できることがわかった。また、アルカンジオール共吸着剤により、短絡電流密度が約15mA/cm^2まで向上し、さらに、グアニジニウムイオンを電解液に添加することで開放電圧が増加することがわかった。以上の研究により、エネルギー変換効率が本研究以前の約2%から約3. 5%に大幅に向上した。, Novel organic solar cells based on the surface complexes of TiO_2 and dicyanomethylene compounds(TCNX). were studied to improve the energy conversion efficiency. By introducing four methyl groups being an electron-donating group to TCNQ, the light absorption region could be extended to the near IR region around 900nm. Furthermore, by using alkanediol as a coadsorbent the short-circuit photocurrent density was enhanced to ca. 15mA/cm^2. In addition, by adding guanidinium ions to the electrolyte, the open-circuit voltage was increased. By this research, the energy conversion efficiency was improved to ca. 3. 5%., 22750120
  • 有機強相関物質における光誘起絶縁体―金属転移の分光学的研究とその応用, 藤沢 潤一, 日本学術振興会, 科学研究費助成事業 若手研究(B), 若手研究(B), 独立行政法人理化学研究所, 2005年, 2006年, 有機強相関物質α-(BEDT-TTF)_2I_3は、135Kを境に金属状態(高温側、電荷非整列状態)から絶縁体状態(低温側、電荷整列状態)へ相転移を起こすことが知られている。我々は、最近、α-(BEDT-TTF)_2I_3の低温絶縁体状態に可視光パルスレーザを照射することにより、絶縁体状態から金属状態に相転移させることに成功した。本年度は、本現象の機構解明を目的に分光学的な研究を行った。実験は、ナノ秒波長可変レーザを用いて、近紫外から近赤外までのパルスレーザをα-(BEDT-TTF)_2I_3に照射して、外部電場下で発生する電流応答を検知した。実験の結果、光誘起絶縁体-金属転移が、450nm付近の光励起だけでなく900nm付近の近赤外光によっても起きることを見出した。α-(BEDT-TTF)_2I_3は450nmと900nmに異なる吸収帯を持ち、450nmの光吸収はHOMOバンド(最高占有軌道)とLUMOバンド(最低被占有軌道)間の電子遷移に、900nmの光吸収はNext HOMOバンド(最高占有軌道より一つ下の分子軌道)とHOMOバンド間の電子遷移に対応している。この実験結果から、光誘起絶縁体-金属転移は光励起直後に生成される電子と正孔の電子状態にそれほど依存せず、格子緩和後に生成される局所的な電荷秩序の乱れが光誘起相転移を引き起こす重要な因子であることを突き詰めた。つまり、光励起により生成される局所的な電荷の乱れがある密度以上になると、ミクロな電荷秩序の破壊がマクロなスケールへ時間および空間発展し、金属状態に相転移することが明らかになった。最近、同様の現象が理論計算でも報告されており、本実験結果を支持している。, 17750141
  • 無機・有機電荷移動量子細線結晶の光誘起変調ドーピング, 藤沢 潤一, 日本学術振興会, 科学研究費助成事業 若手研究(B), 若手研究(B), 独立行政法人理化学研究所, 2003年, 2004年, 無機・有機ハイブリッド擬一次元物質、メチルビオロゲン沃化鉛の光電気伝導について研究を行った。本物質は、沃化鉛一次元鎖とそれを取り囲むメチルビオロゲン分子から成り、特異的にワイヤースペーサ間電荷移動遷移を有し、その電子的励起により無機一次元鎖に単一種の光キャリア(電子または正孔)がドープされる(これをここでは光誘起変調ドーピングと呼ぶ)。この電荷分離状態では、一次元鎖内に電子および正孔を生成する場合に比べ、電子・正孔間の相互作用が小さくなり一次元鎖内の光キャリアの移動度が高くなることが期待される。実験の結果、沃化鉛一次元鎖から有機スペーサ分子(メチルビオロゲン)への電荷移動遷移により光電気伝導が顕著に誘起されることが明らかになった。さらに、光電流の励起スペクトルが電流の方向によって異なることを見出した。この実験結果は、一次元鎖方向とそれに垂直な方向の電気伝導が別種の光キャリアによって生じることに起因している。つまり、一次元方向の光電気伝導は一次元鎖内の正孔ポーラロンにより、それに垂直な方向の光電気伝導はメチルビオロゲン上の電子によると解釈できる。特に、一次元方向の光伝導は、アーバックテールという吸収の裾でピークをもち、これが一次元鎖内の正孔ポーラロンの輸送現象により説明された。さらに、一次元鎖内の正孔ポーラロンの移動度が、室温で非常に大きいこと(>>20cm^2/V sec)を見出した。この高移動度は、電荷移動遷移による光誘起変調ドーピングの効果と一次元鎖内の正孔ポーラロンがソリトン的な状態を形成していることに起因している。以上の実験から、無機・有機電荷移動量子細線結晶の特異な光電気伝導特性を解明することができ、さらに、ダイポーラ光電気伝導体の研究にとって重要な知見を得ることが出来た。, 15750129
  • 溶液中における励起多重項状態の電子構造と反応およびスピンダイナミクス, 藤沢 潤一, 日本学術振興会, 科学研究費助成事業 特別研究員奨励費, 特別研究員奨励費, 東北大学, 1998年, 1998年, 98J01771


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