Researcher Profile and Settings

Researcher

• Name

  FUJISAWA Junichi

Profile and Settings

• Name

  Fujisawa, Junichi

Alternate Names

• JI FUJISAWA

Affiliation

• Gunma University, Associate Professor
• Gunma University

Education

• Apr. 1995, Mar. 1999, Tohoku University
• Apr. 1990, Mar. 1994, Tohoku University, Faculty of Science

Degree

• Doctor of Science
• Doctor of Science

Research Experience

• Jan. 2015, Gunma University
• Apr. 2001, Sep. 2006, RIKEN(The Institute of Physical and Chemical Research) Frontier Research System, Exciton Engineering Laboratory
• Oct. 2006, Dec. 2014
• Apr. 1999, Mar. 2000

Research Activities

Research Areas

• Nanotechnology/Materials, Functional solid-state chemistry
• Nanotechnology/Materials, Inorganic and coordination chemistry
• Nanotechnology/Materials, Composite materials and interfaces

Published Papers

• Detailed Study of a TiO2-Phenol Complex Using Deuterated Phenol, J. Fujisawa, S. Kato, and M. Hanaya, 16 Sep. 2022, Chem. Phys. Lett., 803, 139833, Scientific journal
• Interfacial Charge-Transfer Transitions in Weakly-Coupled TiO2 Complexes with Aromatic Monothiols for Visible-Light Photocatalytic Reactions, J. Fujisawa, S. Kato, and M. Hanaya, 12 Jul. 2022, J. Phys. Chem. C, 126, 11602, 11610, Scientific journal
• Aromatic-ring dependence of interfacial charge-transfer transitions between TiO2 nanoparticles and aromatic carboxylic acids, Jun-ichi Fujisawa, Shunsuke Kato, and Minoru Hanaya, 16 Feb. 2022, Chemical Physics Letters, 788, 139274
• Interfacial Charge-Transfer Transitions between TiO2 Nanoparticles and Benzoic Acid Derivatives, Jun-ichi Fujisawa, Shunsuke Kato, and Minoru Hanaya, 07 Nov. 2021, 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, 02 Jul. 2021, The Journal of Physical Chemistry A, 125, 5903, 5910
• Interfacial Charge-Transfer Transitions in SnO2 Functionalized with Benzoic Acid Derivatives, Jun-ichi Fujisawa and Minoru Hanaya, 09 Jun. 2021, RSC Advances, 11, 20725, 20729

  DOI
• Definitive Assignment and Mechanistic Study of Interfacial Charge-Transfer Transitions between ZnO and Benzenethiol, Jun-ichi Fujisawa, 01 Sep. 2021, Chem. Phys. Lett., 778, 138774, Scientific journal

  DOI
• 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, 10 Nov. 2020, Inorganic Chemistry, Scientific journal

  DOI
• Interfacial Charge-Transfer Transitions for Direct Charge-Separation Photovoltaics, Jun-ichi Fujisawa, 15 May 2020, Energies, 13, 10, 2521, 2521, Scientific journal

  DOI
• Formation of solid solutions in wide miscibility-gap perovskite-type oxide system of Ba_1−xCa_xZrO₃ over the entire Ca composition range, Miho AKO; Jun-ichi FUJISAWA; Minoru HANAYA, 01 Feb. 2020, Journal of the Ceramic Society of Japan, 128, 2, 80, 83, Scientific journal

  DOI
• Interfacial charge-transfer transitions between TiO2 and indole, Jun-ichi Fujisawa, Jan. 2020, Chemical Physics Letters, 739, 136974, 136974, Scientific journal

  DOI
• Interfacial charge-transfer transitions in ZnO induced exclusively by adsorption of aromatic thiols, Jun-ichi Fujisawa; Naohito Kaneko; Minoru Hanaya, 2020, Chemical Communications, 56, 29, 4090, 4093, Scientific journal

  DOI
• 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, Sep. 2019, Thermochimica Acta, 679, 178339, 178339, Scientific journal

  DOI
• Photoinduced H-aggregation of cationic dyes on metal-oxide surfaces via light activated molecular migration, Jun-ichi Fujisawa; Karin Murai; Minoru Hanaya, 2019, Chemical Communications, 55, 97, 14641, 14644, Scientific journal

  DOI
• Visible-light circular dichroism of colourless chiral organic compounds enabled by interfacial charge-transfer transitions, Fujisawa Jun-ichi; Kaneko Naohito; Eda Takumi; Hanaya Minoru, 07 Aug. 2018, CHEMICAL COMMUNICATIONS, 54, 61, 8490, 8493, Scientific journal

  DOI
• Inorganic Control of Interfacial Charge-Transfer Transitions in Catechol-Functionalized Titanium Oxides Using SrTiO3, BaTiO3, and TiO2, Eda Takumi; Fujisawa Jun-ichi; Hanaya Minoru, 19 Jul. 2018, JOURNAL OF PHYSICAL CHEMISTRY C, 122, 28, 16216, 16220, Scientific journal

  DOI
• 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, 11 Jan. 2018, Journal of Physical Chemistry C, 122, 1, 8, 15, Scientific journal

  DOI
• 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, Oct. 2017, CHEMICAL PHYSICS LETTERS, 685, 23, 26, Scientific journal

  DOI
• Light absorption and photoluminescence due to interfacial charge-transfer transitions in aromatic amine-functionalized silicon nanoparticles, Jun-ichi Fujisawa; Minoru Hanaya, Sep. 2017, CHEMICAL PHYSICS LETTERS, 684, 285, 289, Scientific journal

  DOI
• 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, Aug. 2017, JOURNAL OF PHYSICAL CHEMISTRY C, 121, 34, 18710, 18716, Scientific journal

  DOI
• 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, Jul. 2017, CHEMISTRYSELECT, 2, 21, 6097, 6099, Scientific journal

  DOI
• 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, Chemical Physics Letters, 684, 328, 332, Scientific journal

  DOI
• Coloration of tyrosine by organic-semiconductor interfacial charge-transfer transitions, Jun-ichi Fujisawa; Natsumi Kikuchi; Minoru Hanaya, Nov. 2016, CHEMICAL PHYSICS LETTERS, 664, 178, 183, Scientific journal

  DOI
• 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, Oct. 2016, SCIENTIFIC REPORTS, 6, Scientific journal

  DOI
• A Surface Nanocavity Structure of Bisphenol P on TiO2 Showing Interfacial Charge-Transfer Absorption, Jun-ichi Fujisawa; Shingo Matsumura; Minoru Hanaya, Oct. 2016, CHEMISTRYSELECT, 1, 17, 5590, 5593, Scientific journal

  DOI
• Interfacial Charge-Transfer Transitions in BaTiO3 Nanoparticles Adsorbed with Catechol, Jun-ichi Fujisawa; Takumi Eda; Minoru Hanaya, Sep. 2016, JOURNAL OF PHYSICAL CHEMISTRY C, 120, 38, 21162, 21168, Scientific journal

  DOI
• 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, Aug. 2016, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 18, 32, 22286, 22292, Scientific journal

  DOI
• 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, Aug. 2016, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 18, 32, 22244, 22253, Scientific journal

  DOI
• 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, Jul. 2016, CHEMICAL PHYSICS LETTERS, 657, 172, 176, Scientific journal

  DOI
• 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, Jun. 2016, CHEMICAL PHYSICS LETTERS, 653, 11, 16, Scientific journal

  DOI
• Highly-selective absorption control in photosynthetic chlorin dyes, Jun-ichi Fujisawa, Apr. 2015, JOURNAL OF PORPHYRINS AND PHTHALOCYANINES, 19, 4, 601, 609, Scientific journal

  DOI
• Organic-Inorganic Hybrid Lead Iodide Perovskite Featuring Zero Dipole Moment Guanidinium Cations: A Theoretical Analysis, Giacomo Giorgi; Jun-Ichi Fujisawa; Hiroshi Segawa; Koichi Yamashita, Mar. 2015, JOURNAL OF PHYSICAL CHEMISTRY C, 119, 9, 4694, 4701, Scientific journal

  DOI
• 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, Jan. 2015, CHEMICAL PHYSICS LETTERS, 619, 180, 184, Scientific journal

  DOI
• 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, CHEMICAL COMMUNICATIONS, 51, 88, 15894, 15897, Scientific journal

  DOI
• Extremely strong organic-metal oxide electronic coupling caused by nucleophilic addition reaction, Jun-ichi Fujisawa; Minoru Hanaya, 2015, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 17, 25, 16285, 16293, Scientific journal

  DOI
• Interfacial charge-transfer transitions in a TiO2-benzenedithiol complex with Ti-S-C linkages, Jun-ichi Fujisawa; Ryuki Muroga; Minoru Hanaya, 2015, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 17, 44, 29867, 29873, Scientific journal

  DOI
• 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, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 17, 28, 18541, 18546, Scientific journal

  DOI
• Large impact of reorganization energy on photovoltaic conversion due to interfacial charge-transfer transitions, Jun-ichi Fujisawa, 2015, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 17, 18, 12228, 12237, Scientific journal

  DOI
• Charge-transfer complex versus sigma-complex formed between TiO2 and bis(dicyanomethylene) electron acceptors, Jun-ichi Fujisawa; Morio Nagata; Minoru Hanaya, 2015, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 17, 41, 27343, 27356, Scientific journal

  DOI
• Structural and electronic properties featuring ambipolar transport in methylammonium lead iodide perovskite: A DFT analysis, Giacomo Giorgi; Jun-ichi Fujisawa; Hiroshi Segawa; Koichi Yamashita, Aug. 2014, 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, 30 Jul. 2014, Physical Chemistry Chemical Physics, 16, 33, 17955, 17959, Scientific journal

  DOI
• 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, Jul. 2014, CHEMICAL PHYSICS LETTERS, 608, 355, 359, Scientific journal

  DOI
• 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, Jun. 2014, JOURNAL OF PHYSICAL CHEMISTRY C, 118, 23, 12176, 12183, Scientific journal

  DOI
• 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, Jun. 2014, JOURNAL OF PORPHYRINS AND PHTHALOCYANINES, 18, 6, 513, 518, Scientific journal

  DOI
• 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, 19 Dec. 2013, Journal of Physical Chemistry Letters, 4, 24, 4213, 4216, Scientific journal

  DOI
• 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, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 15, 24, 9761, 9767, Scientific journal

  DOI
• 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, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 15, 42, 18584, 18588, Scientific journal

  DOI
• 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, Oct. 2012, JAPANESE JOURNAL OF APPLIED PHYSICS, 51, 10, Scientific journal

  DOI
• 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, Oct. 2012, JAPANESE JOURNAL OF APPLIED PHYSICS, 51, 10, Scientific journal

  DOI
• 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, Feb. 2012, JOURNAL OF PHYSICAL CHEMISTRY LETTERS, 3, 3, 394, 398, Scientific journal

  DOI
• 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, Nov. 2011, JOURNAL OF PHYSICAL CHEMISTRY C, 115, 43, 21487, 21493, Scientific journal

  DOI
• Theoretical Study of the Surface Complex between TiO2 and TCNQ Showing Interfacial Charge-Transfer Transitions, Jono Ryota; Fujisawa Jun-ichi; Segawa Hiroshi; Yamashita Koichi, 19 May 2011, JOURNAL OF PHYSICAL CHEMISTRY LETTERS, 2, 10, 1167, 1170

  DOI
• 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, Jan. 2007, JOURNAL OF PHYSICAL CHEMISTRY C, 111, 3, 1146, 1149, Scientific journal

  DOI
• Nonlinear luminescence from an inorganic-organic layered semiconductor, Makoto Shimizu; Jun-ichi Fujisawa; Teruya Ishihara, Jan. 2007, JOURNAL OF LUMINESCENCE, 122, 485, 487, Scientific journal

  DOI
• Photoluminescence of the inorganic-organic layered semiconductor (C6H5C2H4NH3)(2)PbI4: Observation of triexciton formation, Makoto Shimizu; Jun-ichi Fujisawa; Teruya Ishihara, Oct. 2006, PHYSICAL REVIEW B, 74, 15, Scientific journal

  DOI
• 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, Sep. 2005, PHYSICAL REVIEW B, 72, 12, Scientific journal

  DOI
• 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, Feb. 2005, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 74, 2, 511, 514, Scientific journal

  DOI
• 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, Jan. 2005, PHYSICAL REVIEW B, 71, 4

  DOI
• Excitons and biexcitons bound to a positive ion in a bismuth-doped inorganic-organic layered lead iodide semiconductor, J Fujisawa; T Ishihara, Nov. 2004, PHYSICAL REVIEW B, 70, 20, Scientific journal

  DOI
• Charge-transfer transitions between wires and spacers in an inorganic-organic quasi-one-dimensional crystal methylviologen lead iodide, J Fujisawa; T Ishihara, Sep. 2004, PHYSICAL REVIEW B, 70, 11, Scientific journal

  DOI
• Exciton-exciton interaction in an inorganic-organic layered semiconductor, (C6H5C2H4NH3)(2)PbI4, M Shimizu; J Fujisawa, Jun. 2004, JOURNAL OF LUMINESCENCE, 108, 1-4, 189, 194, Scientific journal

  DOI
• 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, APPLIED MAGNETIC RESONANCE, 21, 3-4, 483, 493, Scientific journal

  DOI
• 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, Dec. 2000, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 455, 2, 452, 459, Scientific journal

  DOI
• 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, Apr. 1999, BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN, 72, 4, 661, 667, Scientific journal

  DOI
• 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, Apr. 1999, JOURNAL OF PHYSICAL CHEMISTRY A, 103, 16, 3138, 3138

  DOI
• 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, Jan. 1999, JOURNAL OF PHYSICAL CHEMISTRY A, 103, 2, 213, 216

  DOI
• Pulsed and cw-time-resolved EPR studies of photoinduced electron transfer between zinc(II) porphyrin and fullerene, J Fujisawa; Y Ohba; S Yamauchi, Sep. 1998, CHEMICAL PHYSICS LETTERS, 294, 1-3, 248, 254, Scientific journal

  DOI
• 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, Apr. 1998, JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 120, 13, 3152, 3158, Scientific journal

  DOI
• 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, Jan. 1998, CHEMICAL PHYSICS LETTERS, 282, 2, 181, 186, Scientific journal

  DOI
• A time-resolved electron paramagnetic resonance study of excited triplet porphyrins in fluid solution, J Fujisawa; Y Ohba; S Yamauchi, Sep. 1997, JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 119, 37, 8736, 8737, Scientific journal

  DOI
• 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, 14 Aug. 1997, Journal of Physical Chemistry A, 101, 33, 5869, 5876, Scientific journal

  DOI
• 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, Jan. 1997, JOURNAL OF PHYSICAL CHEMISTRY A, 101, 4, 434, 439, Scientific journal

  DOI
• 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, Dec. 1996, JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 118, 51, 13079, 13080, Scientific journal

  DOI
• 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, Nov. 1995, JOURNAL OF PHYSICAL CHEMISTRY, 99, 47, 17082, 17084

  DOI
• Organo-Rhodium Complex with Tridentate Biradical Ligand, [Rh(Cp*)(bisnitpy)](PF₆)₂, Chem. Lett. 1994, 2353-2356.

  DOI
• Interfacial charge-transfer transitions in ZnO induced exclusively by adsorption of aromatic thiols., Fujisawa Jun-Ichi;Kaneko Naohito;Hanaya Minoru, Chemical communications (Cambridge, England), 56, 29

  DOI
• Interfacial charge-transfer transitions in SnO2 functionalized with benzoic acid derivatives, Fujisawa, Jun-ichi;Hanaya, Minoru, 2021, RSC ADVANCES, 11, 34, 20725, 20729

  DOI
• Neuraminidase enhances the initial steps of human T-cell leukemia virus type 1 replication, Tanaka, Masakazu;Sun, Binlian;Tezuka, Kenta;Fujisawa, Jun-ichi;Tanaka, Yuetsu;Hoshino, Hiroo;Miwa, Masanao, 2010, MICROBES AND INFECTION, 12, 2, 119, 125

  DOI
• Large impact of reorganization energy on photovoltaic conversion due to interfacial charge-transfer transitions, Fujisawa, Jun-ichi, 2015, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 17, 18, 12228, 12237

  DOI
• Extremely strong organic-metal oxide electronic coupling caused by nucleophilic addition reaction, Fujisawa, Jun-ichi;Hanaya, Minoru, 2015, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 17, 25, 16285, 16293

  DOI
• Charge-transfer complex versus sigma-complex formed between TiO2 and bis(dicyanomethylene) electron acceptors, Fujisawa, Jun-ichi;Nagata, Morio;Hanaya, Minoru, 2015, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 17, 41, 27343, 27356

  DOI
• Highly-efficient dye-sensitized solar cells with collaborative sensitization by silyl-anchor and carboxy-anchor dyes, Kakiage, Kenji;Aoyama, Yohei;Yano, Toru;Oya, Keiji;Fujisawa, Jun-ichi;Hanaya, Minoru, 2015, CHEMICAL COMMUNICATIONS, 51, 88, 15894, 15897

  DOI
• Interfacial charge-transfer transitions in a TiO2-benzenedithiol complex with Ti-S-C linkages, Fujisawa, Jun-ichi;Muroga, Ryuki;Hanaya, Minoru, 2015, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 17, 44, 29867, 29873

  DOI
• 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, CHEMICAL PHYSICS LETTERS, 653, 11, 16

  DOI
• A strategy to minimize the energy offset in carrier injection from excited dyes to inorganic semiconductors for efficient dye-sensitized solar energy conversion, Fujisawa, Jun-ichi;Osawa, Ayumi;Hanaya, Minoru, 2016, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 18, 32, 22244, 22253

  DOI
• Interfacial charge-transfer transitions and reorganization energies in sulfur-bridged TiO2-x-benzenedithiol complexes (x: o, m, p), Fujisawa, Jun-ichi;Muroga, Ryuki;Hanaya, Minoru, 2016, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 18, 32, 22286, 22292

  DOI
• 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, CHEMICAL PHYSICS LETTERS, 657, 172, 176

  DOI
• Interfacial Charge-Transfer Transitions in BaTiO3 Nanoparticles Adsorbed with Catechol, Fujisawa, Jun-ichi;Eda, Takumi;Hanaya, Minoru, 2016, JOURNAL OF PHYSICAL CHEMISTRY C, 120, 38, 21162, 21168

  DOI
• Achievement of over 1.4 V photovoltage in a dye-sensitized solar cell by the application of a silyl-anchor coumarin dye, Kakiage, Kenji;Osada, Hiroyuki;Aoyama, Yohei;Yano, Toru;Oya, Keiji;Iwamoto, Shinji;Fujisawa, Jun-ichi;Hanaya, Minoru, 2016, SCIENTIFIC REPORTS, 6

  DOI
• Coloration of tyrosine by organic-semiconductor interfacial charge-transfer transitions, Fujisawa, Jun-ichi;Kikuchi, Natsumi;Hanaya, Minoru, 2016, CHEMICAL PHYSICS LETTERS, 664, 178, 183

  DOI
• A Surface Nanocavity Structure of Bisphenol P on TiO2 Showing Interfacial Charge-Transfer Absorption, Fujisawa, Jun-ichi;Matsumura, Shingo;Hanaya, Minoru, 2016, CHEMISTRYSELECT, 1, 17, 5590, 5593

  DOI
• Facile and Rapid Visualization of Colorless Endocrine Disruptor Bisphenol A by Interfacial Charge-Transfer Transitions with TiO2 Nanoparticles, Fujisawa, Jun-ichi;Matsumura, Shingo;Hanaya, Minoru, 2017, CHEMISTRYSELECT, 2, 21, 6097, 6099

  DOI
• Light absorption and photoluminescence due to interfacial charge-transfer transitions in aromatic amine-functionalized silicon nanoparticles, Fujisawa, Jun-ichi;Hanaya, Minoru, 2017, CHEMICAL PHYSICS LETTERS, 684, 285, 289

  DOI
• 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, Fujisawa, Jun-ichi;Eda, Takumi;Hanaya, Minoru, 2017, CHEMICAL PHYSICS LETTERS, 684, 328, 332

  DOI
• 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, Fujisawa, Jun-ichi;Eda, Takumi;Giorgi, Giacomo;Hanayat, Minoru, 2017, JOURNAL OF PHYSICAL CHEMISTRY C, 121, 34, 18710, 18716

  DOI
• 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, CHEMICAL PHYSICS LETTERS, 685, 23, 26

  DOI
• 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, JOURNAL OF PHYSICAL CHEMISTRY C, 122, 1, 8, 15

  DOI
• 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, JOURNAL OF PHYSICAL CHEMISTRY C, 122, 28, 16216, 16220

  DOI
• 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, CHEMICAL COMMUNICATIONS, 54, 61, 8490, 8493

  DOI
• Formation of Ba1-xCaxTiO3 solid solutions beyond the solubility limit by 'sputter-anneal' method, Ako, Miho;Kogure, Takeshi;Kobayashi, Yumie;Kyomen, Toni;Fujisawa, Jun-ichi;Hanaya, Minoru, 2019, THERMOCHIMICA ACTA, 679

  DOI
• Photoinduced H-aggregation of cationic dyes on metal-oxide surfaces via light activated molecular migration, Fujisawa, Jun-ichi;Murai, Karin;Hanaya, Minoru, 2019, CHEMICAL COMMUNICATIONS, 55, 97, 14641, 14644

  DOI
• Interfacial charge-transfer transitions between TiO2 and indole, Fujisawa, Jun-ichi, 2020, CHEMICAL PHYSICS LETTERS, 739

  DOI
• Formation of solid solutions in wide miscibility-gap perovskite-type oxide system of Ba1-xCaxZrO3 over the entire Ca composition range, Ako, Miho;Fujisawa, Jun-ichi;Hanaya, Minoru, 2020, JOURNAL OF THE CERAMIC SOCIETY OF JAPAN, 128, 2, 80, 83

  DOI
• Interfacial charge-transfer transitions in ZnO induced exclusively by adsorption of aromatic thiols, Fujisawa, Jun-ichi;Kaneko, Naohito;Hanaya, Minoru, 2020, CHEMICAL COMMUNICATIONS, 56, 29, 4090, 4093

  DOI
• Interfacial Charge-Transfer Transitions for Direct Charge-Separation Photovoltaics, Fujisawa, Jun-ichi, 2020, ENERGIES, 13, 10

  DOI
• Immobilizing a pi-Conjugated Catecholato Framework on Surfaces of SiO2 Insulator Films via a One-Atom Anchor of a Platinum Metal Center to Modulate Organic Transistor Performance, Tahara, Keishiro;Ashihara, Yuya;Ikeda, Takashi;Kadoya, Tomofumi;Fujisawa, Jun-ichi;Ozawa, Yoshiki;Tajima, Hiroyuki;Toyoda, Noriaki;Haruyama, Yuichi;Abe, Masaaki, 2020, INORGANIC CHEMISTRY, 59, 24, 17945, 17957

  DOI
• 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, Fujisawa, Jun-ichi;Kaneko, Naohito;Hanaya, Minoru, 2021, JOURNAL OF PHYSICAL CHEMISTRY C, 125, 24, 13534, 13541

  DOI
• Definitive assignment and mechanistic study of interfacial charge-transfer transitions between ZnO and benzenethiol, Fujisawa, Jun-ichi, 2021, CHEMICAL PHYSICS LETTERS, 778

  DOI
• Linkage Dependence of Interfacial Charge-Transfer Transitions in ZnO: Carboxylate versus Sulfur Linker, Fujisawa, Jun-ichi;Hanaya, Minoru, 2021, JOURNAL OF PHYSICAL CHEMISTRY A, 125, 27, 5903, 5910

  DOI
• Interfacial Charge-Transfer Transitions between TiO2 Nanoparticles and Benzoic Acid Derivatives, Fujisawa, Jun-ichi;Kato, Shunsuke;Hanaya, Minoru, 2021, JOURNAL OF PHYSICAL CHEMISTRY C, 125, 45, 25075, 25086

  DOI
• Aromatic-ring dependence of interfacial charge-transfer transitions between TiO2 nanoparticles and aromatic carboxylic acids, Fujisawa, Jun-ichi;Kato, Shunsuke;Hanaya, Minoru, 2022, CHEMICAL PHYSICS LETTERS, 788

  DOI
• Interfacial Charge-Transfer Transitions in Weakly Coupled TiO2 Complexes with Aromatic Monothiols for Visible-Light Photocatalytic Reactions, Fujisawa, Jun-ichi;Kato, Shunsuke;Hanaya, Minoru, 2022, JOURNAL OF PHYSICAL CHEMISTRY C

  DOI
• Detailed study of a TiO2-phenol complex using deuterated phenol, Fujisawa, Jun-ichi;Kato, Shunsuke;Hanaya, Minoru, 2022, CHEMICAL PHYSICS LETTERS, 803

  DOI
• Formation of solid solutions in wide miscibility-gap perovskite-type oxide system of Ba_1−xCa_xZrO₃ over the entire Ca composition range, AKO Miho;FUJISAWA Jun-ichi;HANAYA Minoru, Feb. 2020, Journal of the Ceramic Society of Japan, 128, 2, 80, 83

  DOI
• Extremely strong organic-metal oxide electronic coupling caused by nucleophilic addition reaction., Fujisawa Jun-ichi;Hanaya Minoru, Jun. 2015, Physical chemistry chemical physics : PCCP, 17, 25

  DOI
• Charge-transfer complex versus σ-complex formed between TiO2 and bis(dicyanomethylene) electron acceptors., Fujisawa Jun-ichi;Nagata Morio;Hanaya Minoru, Physical chemistry chemical physics : PCCP, 17, 41

  DOI
• Interfacial charge-transfer transitions in a TiO2-benzenedithiol complex with Ti-S-C linkages., Fujisawa Jun-ichi;Muroga Ryuki;Hanaya Minoru, Oct. 2015, Physical chemistry chemical physics : PCCP, 17, 44

  DOI
• A strategy to minimize the energy offset in carrier injection from excited dyes to inorganic semiconductors for efficient dye-sensitized solar energy conversion., Fujisawa Jun-Ichi;Osawa Ayumi;Hanaya Minoru, Physical chemistry chemical physics : PCCP, 18, 32

  DOI
• Interfacial charge-transfer transitions and reorganization energies in sulfur-bridged TiO2-x-benzenedithiol complexes (x: o, m, p)., Fujisawa Jun-Ichi;Muroga Ryuki;Hanaya Minoru, Physical chemistry chemical physics : PCCP, 18, 32

  DOI
• Achievement of over 1.4 V photovoltage in a dye-sensitized solar cell by the application of a silyl-anchor coumarin dye., Kakiage Kenji;Osada Hiroyuki;Aoyama Yohei;Yano Toru;Oya Keiji;Iwamoto Shinji;Fujisawa Jun-Ichi;Hanaya Minoru, Oct. 2016, Scientific reports, 6

  DOI
• Visible-light circular dichroism of colourless chiral organic compounds enabled by interfacial charge-transfer transitions., Fujisawa Jun-Ichi;Kaneko Naohito;Eda Takumi;Hanaya Minoru, Chemical communications (Cambridge, England), 54, 61

  DOI
• Photoinduced H-aggregation of cationic dyes on metal-oxide surfaces via light activated molecular migration., Fujisawa Jun-Ichi;Murai Karin;Hanaya Minoru, Nov. 2019, Chemical communications (Cambridge, England), 55, 97

  DOI
• 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., Tahara Keishiro;Ashihara Yuya;Ikeda Takashi;Kadoya Tomofumi;Fujisawa Jun-Ichi;Ozawa Yoshiki;Tajima Hiroyuki;Toyoda Noriaki;Haruyama Yuichi;Abe Masaaki, Nov. 2020, Inorganic chemistry, 59, 24

  DOI
• Linkage Dependence of Interfacial Charge-Transfer Transitions in ZnO: Carboxylate versus Sulfur Linker., Fujisawa Jun-Ichi;Hanaya Minoru, Jul. 2021, The journal of physical chemistry. A, 125, 27

  DOI
• Interfacial charge-transfer transitions in SnO2 functionalized with benzoic acid derivatives., Fujisawa Jun-Ichi;Hanaya Minoru, Jun. 2021, RSC advances, 11, 34

  DOI
• Interfacial Charge-Transfer Transitions between ZnO Nanoparticles and Aliphatic Thiols, Fujisawa, Jun-ichi;Kato, Shunsuke;Hanaya, Minoru, 2023, JOURNAL OF PHYSICAL CHEMISTRY C, 127, 31, 15300, 15306

  DOI
• Substituent effects on interfacial charge-transfer transitions in a TiO2-phenol complex, Fujisawa, Jun-ichi;Kato, Shunsuke;Hanaya, Minoru, 2023, CHEMICAL PHYSICS LETTERS, 827

  DOI
• Adsorption, Electronic, and Optical Properties of TiO₂-Pyridine Complexes: General Principles for Interfacial Charge-Transfer Transitions, Fujisawa, Jun-ichi;Kato, Shunsuke;Hanaya, Minoru, 2023, JOURNAL OF PHYSICAL CHEMISTRY C, 127, 36, 17888, 17895

  DOI

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, CHEMICAL COMMUNICATIONS, 51, 88, 15894, 15897

  DOI
• 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, CHEMICAL COMMUNICATIONS, 51, 88, 15894, 15897

  DOI
• 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, Jan. 2015, CHEMICAL PHYSICS LETTERS, 619, 5, 180, 184

  DOI
• Interfacial charge-transfer transitions in a TiO2-benzenedithiol complex with Ti-S-C linkages, Jun-ichi Fujisawa; Ryuki Muroga; Minoru Hanaya, 2015, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 17, 44, 29867, 29873

  DOI
• 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, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 17, 28, 18541, 18546

  DOI
• 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, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 17, 28, 18541, 18546

  DOI
• Organic-Inorganic Hybrid Lead Iodide Perovskite Featuring Zero Dipole Moment Guanidinium Cations: A Theoretical Analysis, Giacomo Giorgi; Jun-Ichi Fujisawa; Hiroshi Segawa; Koichi Yamashita, Mar. 2015, JOURNAL OF PHYSICAL CHEMISTRY C, 119, 9, 4694, 4701

  DOI
• Organic-Inorganic Hybrid Lead Iodide Perovskite Featuring Zero Dipole Moment Guanidinium Cations: A Theoretical Analysis, Giacomo Giorgi; Jun-Ichi Fujisawa; Hiroshi Segawa; Koichi Yamashita, Mar. 2015, JOURNAL OF PHYSICAL CHEMISTRY C, 119, 9, 4694, 4701

  DOI
• Charge-transfer complex versus sigma-complex formed between TiO2 and bis(dicyanomethylene) electron acceptors, Jun-ichi Fujisawa; Morio Nagata; Minoru Hanaya, 2015, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 17, 41, 27343, 27356

  DOI
• 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, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 15, 24, 9761, 9767

  DOI
• 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, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 15, 24, 9761, 9767

  DOI
• 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, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 15, 42, 18584, 18588

  DOI
• 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, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 15, 42, 18584, 18588

  DOI
• 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, Oct. 2016, SCIENTIFIC REPORTS, 6, 35888

  DOI
• 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, Oct. 2016, SCIENTIFIC REPORTS, 6, 35888

  DOI
• 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, Aug. 2016, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 18, 32, 22286, 22292

  DOI
• A Surface Nanocavity Structure of Bisphenol P on TiO2 Showing Interfacial Charge-Transfer Absorption, Jun-ichi Fujisawa; Shingo Matsumura; Minoru Hanaya, Oct. 2016, CHEMISTRYSELECT, 1, 17, 5590, 5593

  DOI
• 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, Jul. 2016, CHEMICAL PHYSICS LETTERS, 657, 172, 176

  DOI
• Coloration of tyrosine by organic-semiconductor interfacial charge-transfer transitions, Jun-ichi Fujisawa; Natsumi Kikuchi; Minoru Hanaya, Nov. 2016, CHEMICAL PHYSICS LETTERS, 664, 178, 183

  DOI
• 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, Aug. 2016, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 18, 32, 22244, 22253

  DOI
• 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, Jun. 2014, JOURNAL OF PHYSICAL CHEMISTRY C, 118, 23, 12176, 12183

  DOI
• 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, Jun. 2014, JOURNAL OF PHYSICAL CHEMISTRY C, 118, 23, 12176, 12183

  DOI
• Lead-iodide nanowire perovskite with methylviologen showing interfacial charge-transfer absorption: a DFT analysis, Jun-ichi Fujisawa; Giacomo Giorgi, Sep. 2014, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 16, 33, 17955, 17959

  DOI
• Lead-iodide nanowire perovskite with methylviologen showing interfacial charge-transfer absorption: a DFT analysis, Jun-ichi Fujisawa; Giacomo Giorgi, Sep. 2014, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 16, 33, 17955, 17959

  DOI
• 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, Jun. 2014, JOURNAL OF PORPHYRINS AND PHTHALOCYANINES, 18, 6, 513, 518

  DOI
• 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, Sep. 2017, CHEMICAL PHYSICS LETTERS, 684, 328, 332

  DOI
• 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, Sep. 2017, CHEMICAL PHYSICS LETTERS, 684, 328, 332

  DOI
• 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, Aug. 2017, JOURNAL OF PHYSICAL CHEMISTRY C, 121, 34, 18710, 18716

  DOI
• 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, Aug. 2017, JOURNAL OF PHYSICAL CHEMISTRY C, 121, 34, 18710, 18716

  DOI
• 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, Jul. 2017, CHEMISTRYSELECT, 2, 21, 6097, 6099

  DOI
• 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, JOURNAL OF PHYSICAL CHEMISTRY C, 122, 1, 8-15.

  DOI
• 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, CHEMICAL PHYSICS LETTERS, 685, 23, 26

  DOI
• Light absorption and photoluminescence due to interfacial charge-transfer transitions in aromatic amine-functionalized silicon nanoparticles, Fujisawa, Jun-ichi; Hanaya, Minoru, 2017, CHEMICAL PHYSICS LETTERS, 684, 285, 289

  DOI
• 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, ChemistrySelect, 2, 21, 6097, 6099

  DOI
• Coloration of tyrosine by organic-semiconductor interfacial charge-transfer transitions, Jun-ichi Fujisawa; Natsumi Kikuchi; Minoru Hanaya, 01 Nov. 2016, Chemical Physics Letters, 664, 178, 183

  DOI
• A Surface Nanocavity Structure of Bisphenol P on TiO2 Showing Interfacial Charge-Transfer Absorption, Jun-Ichi Fujisawa; Shingo Matsumura; Minoru Hanaya, 2016, ChemistrySelect, 1, 17, 5590, 5593

  DOI
• Interfacial Charge-Transfer Transitions in BaTiO3 Nanoparticles Adsorbed with Catechol, Fujisawa, Jun-ichi; Eda, Takumi; Hanaya, Minoru, 2016, JOURNAL OF PHYSICAL CHEMISTRY C, 120, 38, 21162, 21168

  DOI
• 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, Physical Chemistry Chemical Physics, 18, 32, 22244, 22253

  DOI
• 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, CHEMICAL PHYSICS LETTERS, 657, 172, 176

  DOI
• 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, CHEMICAL PHYSICS LETTERS, 653, 11-16.

  DOI
• Extremely strong organic-metal oxide electronic coupling caused by nucleophilic addition reaction, Jun-Ichi Fujisawa; Minoru Hanaya, 07 Jul. 2015, Physical Chemistry Chemical Physics, 17, 25, 16285, 16293

  DOI
• Large impact of reorganization energy on photovoltaic conversion due to interfacial charge-transfer transitions, Fujisawa, Jun-ichi, 2015, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 17, 18, 12228, 12237

  DOI
• Highly-selective absorption control in photosynthetic chlorin dyes, Fujisawa, Jun-ichi, 2015, JOURNAL OF PORPHYRINS AND PHTHALOCYANINES, 19, 4, 601, 609

  DOI
• 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, CHEMICAL PHYSICS LETTERS, 608, 21, 355, 359

  DOI
• 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, Biophysics (Japan), 10, 25, 34

  DOI
• 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, 19 Dec. 2013, Journal of Physical Chemistry Letters, 4, 24, 4213, 4216

  DOI
• 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, 122, 1, 8-15.

  DOI
• 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, Chemical Physics Letters, 685, 23, 26

  DOI
• Light absorption and photoluminescence due to interfacial charge-transfer transitions in aromatic amine-functionalized silicon nanoparticles, Jun-ichi Fujisawa; Minoru Hanaya, 2017, Chemical Physics Letters, 684, 285, 289

  DOI
• Interfacial Charge-Transfer Transitions in BaTiO3 Nanoparticles Adsorbed with Catechol, Jun-Ichi Fujisawa; Takumi Eda; Minoru Hanaya, 29 Sep. 2016, Journal of Physical Chemistry C, 120, 38, 21162, 21168

  DOI
• 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, Physical Chemistry Chemical Physics, 18, 32, 22286, 22292

  DOI
• 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, 653, 11-16.

  DOI
• Interfacial charge-transfer transitions in a TiO2-benzenedithiol complex with Ti-S-C linkages, Jun-Ichi Fujisawa; Ryuki Muroga; Minoru Hanaya, 2015, Physical Chemistry Chemical Physics, 17, 44, 29867, 29873

  DOI
• Charge-transfer complex versus sigma-complex formed between TiO2 and bis(dicyanomethylene) electron acceptors, Fujisawa, Jun-ichi; Nagata, Morio; Hanaya, Minoru, 2015, 17, 41, 27343, 27356

  DOI
• Extremely strong organic-metal oxide electronic coupling caused by nucleophilic addition reaction, Jun-Ichi Fujisawa; Minoru Hanaya, 07 Jul. 2015, Physical Chemistry Chemical Physics, 17, 25, 16285, 16293

  DOI
• Large impact of reorganization energy on photovoltaic conversion due to interfacial charge-transfer transitions, Jun-Ichi Fujisawa, 14 May 2015, Physical Chemistry Chemical Physics, 17, 18, 12228, 12237

  DOI
• 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, 05 Jan. 2015, Chemical Physics Letters, 619, 5, 180, 184

  DOI
• Highly-selective absorption control in photosynthetic chlorin dyes, Jun-Ichi Fujisawa, 01 Apr. 2015, Journal of Porphyrins and Phthalocyanines, 19, 4, 601, 609

  DOI
• 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, 21 Jul. 2014, Chemical Physics Letters, 608, 21, 355, 359

  DOI
• 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, Journal of Porphyrins and Phthalocyanines, 18, 6, 513, 518

  DOI
• 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, Biophysics (Japan), 10, 25, 34

  DOI
• 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, 19 Dec. 2013, Journal of Physical Chemistry Letters, 4, 24, 4213, 4216

  DOI

Presentations

• 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, 04 Dec. 2021
• 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, 04 Dec. 2021
• 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, 21 Oct. 2021

Research Projects

• Novel Functions in Organic-Inorganic Surface Nanostructures, Fujisawa Jun-ichi, Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research, Grant-in-Aid for Challenging Exploratory Research, Gunma University, 01 Apr. 2016, 31 Mar. 2018, 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

  対象リソースIRI
• Development of High Performance Dye-sensitized Solar Cells by Organosilicon Concept, Hanaya Minoru, Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B), Grant-in-Aid for Scientific Research (B), Gunma University, 01 Apr. 2015, 31 Mar. 2018, 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

  対象リソースIRI
• Research and development of next-generation inorganic solar cells using interfacial charge-transfer transitions as a novel operating principle, Fujisawa Jun-ichi, Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research, Grant-in-Aid for Challenging Exploratory Research, 01 Apr. 2013, 31 Mar. 2016, 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

  対象リソースIRI
• Oct. 2011, Feb. 2015
• Control of Photovoltaic Devices based on Interfacial Charge-Transfer Transitions between Metal Oxide Semiconductor and Organic Molecules, FUJISAWA Jun-ichi, Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B), Grant-in-Aid for Young Scientists (B), The University of Tokyo, 2010, 2011, 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

  対象リソースIRI
• 2005, 2006, 17750141
• 2003, 2004, 15750129
• 1998, 1998, 98J01771