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Tamai, Yasunari

Graduate School of Engineering, Division of Polymer Chemistry Assistant Professor

Tamai, Yasunari
list
    Last Updated :2022/06/29

    Basic Information

    Faculty

    • 工学部

    Academic Degree

    • 修士(工学)(京都大学)
    • 博士(工学)(京都大学)

    Research History

    • From Oct. 2018, To Present
      JST PRESTO, researcher
    • From Nov. 2016, To Present
      Kyoto Univ., Dept. of Polymer Chemistry, Assistant Professor
    • From Sep. 2015, To Sep. 2016
      University of Cambridge, Cavendish Lab., Postdoc
    • From Apr. 2013, To Aug. 2015
      Kyoto Univ., Dept. of Polymer Chemistry, Postdoc

    Language of Instruction

    • English
    • Japanese

    ID,URL

    researchmap URL

    list
      Last Updated :2022/06/29

      Research

      Research Topics, Overview of the research

      • Research Topics

        Exciton and Polaron Dynamics in Polymer Solar Cells
      • Overview of the research

        My research interests focuses on photophysics and photochemistry such as formation, diffusion, and decay dynamics of excitons and polarons in organic materials. Those photophysical processes are measured spectroscopically by means of ultrashort pulsed-laser systems. My current research interest focuses on spectroscopic approach to polymer solar cells.

      Research Interests

      • Ultrafast spectroscopy
      • Optoelectronics
      • Photophysics/Photochemistry

      Research Areas

      • Nanotechnology/Materials, Organic functional materials
      • Nanotechnology/Materials, Applied materials
      • Manufacturing technology (mechanical, electrical/electronic, chemical engineering), Electronic devices and equipment
      • Nanotechnology/Materials, Polymer chemistry

      Papers

      • Singlet Exciton Dynamics in Conjugated Polymer Films
        Ohkita Hideo; Tamai Yasunari; Guo Jiamo; Benten Hiroaki; Ito Shinzaburo
        Journal of The Society of Photographic Science and Technology of Japan, 2014
      • Molecular Understanding of How the Interfacial Structure Impacts the Open-Circuit Voltage of Highly Crystalline Polymer Solar Cells
        Tomohiro Fukuhara; Koshi Yamazaki; Takuto Hidani; Masahiko Saito; Yasunari Tamai; Itaru Osaka; Hideo Ohkita
        ACS APPLIED MATERIALS & INTERFACES, Jul. 2021, Peer-reviewed
      • Prolongation of the singlet exciton lifetime of nonfullerene acceptor films by the replacement of the central benzene core with naphthalene
        Tomokazu Umeyama; Kensho Igarashi; Yasunari Tamai; Tatsuho Wada; Taiki Takeyama; Daiki Sasada; Keiichi Ishida; Tomoyuki Koganezawa; Shunsuke Ohtani; Kazuo Tanaka; Hideo Ohkita; Hiroshi Imahori
        Sustainable Energy and Fuels, Apr. 2021
      • Significantly Sensitized Ternary Blend Polymer Solar Cells with a Very Small Content of the Narrow-Band Gap Third Component That Utilizes Optical Interference
        Masahiko Saito; Yasunari Tamai; Hiroyuki Ichikawa; Hiroyuki Yoshida; Daisuke Yokoyama; Hideo Ohkita; Itaru Osaka
        Macromolecules, 08 Dec. 2020
      • Sensitizer–host–annihilator ternary-cascaded triplet energy landscape for efficient photon upconversion in the solid state
        Yuji Sakamoto; Yasunari Tamai; Hideo Ohkita
        The Journal of Chemical Physics, 28 Oct. 2020
      • Delocalization boosts charge separation in organic solar cells
        Yasunari Tamai
        Polymer Journal, 16 Jul. 2020, Peer-reviewed
      • Two-Dimensional Exciton Diffusion in an HJ-Aggregate of Naphthobisoxadiazole-Based Copolymer Films
        Yasuhiro Murata; Taiki Takeyama; Yuji Sakamoto; Kento Yamaguchi; Yasunari Tamai; Hideo Ohkita
        The Journal of Physical Chemistry C, 18 Jun. 2020, Peer-reviewed
      • Role of Energy Offset in Nonradiative Voltage Loss in Organic Solar Cells
        Toshiharu Saito; Shin-ichiro Natsuda; Kenta Imakita; Yasunari Tamai; Hideo Ohkita
        Solar RRL, 10 Jun. 2020, Peer-reviewed, Corresponding author
      • Efficient light-harvesting, energy migration, and charge transfer by nanographene-based nonfullerene small-molecule acceptors exhibiting unusually long excited-state lifetime in the film state
        Tomokazu Umeyama; Kensho Igarashi; Daiki Sasada; Yasunari Tamai; Keiichi Ishida; Tomoyuki Koganezawa; Shunsuke Ohtani; Kazuo Tanaka; Hideo Ohkita; Hiroshi Imahori
        CHEMICAL SCIENCE, Mar. 2020, Peer-reviewed
      • Impact of Noncovalent Sulfur–Fluorine Interaction Position on Properties, Structures, and Photovoltaic Performance in Naphthobisthiadiazole‐Based Semiconducting Polymers
        Masahiko Saito; Tomohiro Fukuhara; Satoshi Kamimura; Hiroyuki Ichikawa; Hiroyuki Yoshida; Tomoyuki Koganezawa; Yutaka Ie; Yasunari Tamai; Hyung Do Kim; Hideo Ohkita; Itaru Osaka
        Advanced Energy Materials, Feb. 2020, Peer-reviewed
      • Efficient light-harvesting, energy migration, and charge transfer by nanographene-based nonfullerene small-molecule acceptors exhibiting unusually long excited-state lifetime in the film state
        Tomokazu Umeyama; Kensho Igarashi; Daiki Sasada; Yasunari Tamai; Keiichi Ishida; Tomoyuki Koganezawa; Shunsuke Ohtani; Kazuo Tanaka; Hideo Ohkita; Hiroshi Imahori
        Chemical Science, 2020, Peer-reviewed
      • Enhanced Hole Transport in Ternary Blend Polymer Solar Cells
        ChemPhysChem, 16 Oct. 2019, Peer-reviewed
      • Enhanced Hole Transport in Ternary Blend Polymer Solar Cells
        Koshiro Midori; Tomohiro Fukuhara; Yasunari Tamai; Hyung Do Kim; Hideo Ohkita
        CHEMPHYSCHEM, Oct. 2019, Peer-reviewed
      • Bimolecular recombination and fill factor in crystalline polymer solar cells
        Tomohiro Fukuhara; Yasunari Tamai; Itaru Osaka; Hideo Ohkita
        Japanese Journal of Applied Physics, 01 Aug. 2018, Peer-reviewed
      • Ultrafast Long-Range Charge Separation in Nonfullerene Organic Solar Cells
        Yasunari Tamai; Yeli Fan; Vincent O. Kim; Kostiantyn Ziabrev; Akshay Rao; Stephen Barlow; Seth R. Marder; Richard H. Friend; S. Matthew Menke
        ACS Nano, 26 Dec. 2017, Peer-reviewed
      • Exciton and charge dynamics in polymer solar cells
        Yasunari Tamai
        Kobunshi Ronbunshu, 01 Sep. 2017, Peer-reviewed
      • Exciton and Charge Dynamics in Polymer Solar Cells
        Yasunari Tamai
        KOBUNSHI RONBUNSHU, 2017, Peer-reviewed
      • Light-Induced Degradation Mechanism in Poly(3-hexylthiophene)/Fullerene Blend Solar Cells
        Advanced Energy Materials, Jun. 2016, Peer-reviewed
      • Reduced Bimolecular Recombination in Polymer Solar Cells
        Tomohiro Fukuhara; Miki Osaka; Yasunari Tamai; Hideo Ohkita; Hiroaki Benten; Shinzaburo Ito
        JOURNAL OF PHOTOPOLYMER SCIENCE AND TECHNOLOGY, 2016, Peer-reviewed
      • Transient Absorption Spectroscopy for Polymer Solar Cells
        Hideo Ohkita; Yasunari Tamai; Hiroaki Benten; Shinzaburo Ito
        IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS, Jan. 2016, Peer-reviewed
      • Ultrafast Singlet Fission in a Push-Pull Low-Bandgap Polymer Film
        Yukitomo Kasai; Yasunari Tamai; Hideo Ohkita; Hiroaki Benten; Shinzaburo Ito
        Journal of the American Chemical Society, 30 Dec. 2015, Peer-reviewed
      • High-efficiency polymer solar cells with small photon energy loss
        Nature Communications, Dec. 2015, Peer-reviewed
      • Interface Engineering for Ternary Blend Polymer Solar Cells with a Heterostructured Near-IR Dye
        Advanced Materials, Oct. 2015, Peer-reviewed
      • Exciton Diffusion in Conjugated Polymers: From Fundamental Understanding to Improvement in Photovoltaic Conversion Efficiency
        The Journal of Physical Chemistry Letters, 03 Sep. 2015, Peer-reviewed
      • Triplet Exciton Dynamics in Fluorene-Amine Copolymer Films
        Yasunari Tamai; Hideo Ohkita; Hiroaki Benten; Shinzaburo Ito
        CHEMISTRY OF MATERIALS, Apr. 2014, Peer-reviewed
      • One-Dimensional Singlet Exciton Diffusion in Poly(3-hexylthiophene) Crystalline Domains
        The Journal of Physical Chemistry Letters, 16 Jan. 2014, Peer-reviewed
      • Dye Sensitization in the Visible Region for Low-Bandgap Polymer Solar Cells
        Yanbin Wang; Bo Zheng; Yasunari Tamai; Hideo Ohkita; Hiroaki Benten; Shinzaburo Ito
        JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 2014, Peer-reviewed
      • Charge-carrier generation in organic solar cells using crystalline donor polymers
        Yasunari Tamai; Kazuki Tsuda; Hideo Ohkita; Hiroaki Benten; Shinzaburo Ito
        PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 2014, Peer-reviewed
      • Dynamical Excimer Formation in Rigid Carbazolophane via Charge Transfer State
        Yasunari Tamai; Hideo Ohkita; Jiro Shimada; Hiroaki Benten; Shinzaburo Ito; Sho Yamanaka; Kenji Hisada; Keita Tani; Koji Kubono; Teruo Shinmyozu
        JOURNAL OF PHYSICAL CHEMISTRY A, Aug. 2013, Peer-reviewed
      • Singlet Fission in Poly(9,9 '-di-n-octylfluorene) Films
        Yasunari Tamai; Hideo Ohkita; Hiroaki Benten; Shinzaburo Ito
        JOURNAL OF PHYSICAL CHEMISTRY C, May 2013, Peer-reviewed
      • Conformation of single homopolymer chain in microphase-separated block copolymer monolayer studied by scanning near-field optical microscopy
        Yasunari Tamai; Ryojun Sekine; Hiroyuki Aoki; Shinzaburo Ito
        Macromolecules, 23 Jun. 2009, Peer-reviewed
      • Poly(methacrylate)s Labeled by Perylene Diimide: Synthesis and Applications in Single Chain Detection Studies
        Hiroyuki Aoki; Toshiaki Takahashi; Yasunari Tamai; Ryojun Sekine; Shinji Aoki; Keita Tani; Shinzaburo Ito
        POLYMER JOURNAL, 2009, Peer-reviewed

      Awards

      • 08 Sep. 2011
        The Japanese Photochemistry Association, Outstanding Student Award
      • 14 Nov. 2014
        The Japan Society of Applied Physics, 第37回(2014年秋季)応用物理学会講演奨励賞
      • 17 Nov. 2016
        第1回フロンティア太陽電池セミナー実行委員会, 第1回フロンティア太陽電池セミナー優秀ポスター賞
      • 30 May 2019
        高分子学会, 高分子研究奨励賞
      • 12 Jul. 2019
        高分子学会関西支部, ヤングサイエンティスト講演賞

      External funds: Kakenhi

      • ドナー/アクセプター界面における動的エキシトンの高速電荷分離メカニズムの解明
        Grant-in-Aid for Transformative Research Areas (A)
        Transformative Research Areas, Section (II)
        Kyoto University
        玉井 康成
        From 10 Sep. 2021, To 31 Mar. 2023, Adopted
      • Offset-less charge generation due to symmetry breaking in pi-conjugated molecular systems
        Grant-in-Aid for Scientific Research (A)
        Medium-sized Section 35:Polymers, organic materials, and related fields
        Kyoto University
        大北 英生
        From 05 Apr. 2021, To 31 Mar. 2026, Granted
        電荷生成;オフセットレス;エントロピー;エンタルピー;自発的対称性の破れ
      • 電子ドナー/アクセプター界面における究極的に「無駄」の無い電荷分離の実現
        Grant-in-Aid for Scientific Research (B)
        Basic Section 35030:Organic functional materials-related
        Kyoto University
        玉井 康成
        From 01 Apr. 2021, To 31 Mar. 2024, Granted
        有機薄膜太陽電池;高速分光;電荷分離;電荷再結合
      • Improvement in Conductive Properties of Conjugated Polymer Blended in Insulating Polymer
        Grant-in-Aid for Challenging Research (Exploratory)
        Medium-sized Section 35:Polymers, organic materials, and related fields
        Kyoto University
        Hideo OHKITA
        From 28 Jun. 2019, To 31 Mar. 2021, Project Closed
        共役高分子;絶縁性高分子;結晶;非晶;相溶性;分子量;表面エネルギー;太陽電池;結晶性共役高分子;ブレンド膜;電荷輸送特性;分子量依存性;ブレンド;非晶性;結晶性;正孔輸送;移動度;電荷輸送;電流計測原子間力顕微鏡
      • Exploratory Study on Conjugated Polymers with Highly Efficient Singlet Fission
        Grant-in-Aid for Challenging Research (Exploratory)
        Kyoto University
        Hideo OHKITA
        From 30 Jun. 2017, To 31 Mar. 2019, Project Closed
        一重項分裂;共役高分子;J凝集;H凝集;分子内D-A;分子内D-A;結晶性共役高分子;分子鎖内;分子鎖間;三重項励起子対;三重項励起子解離;励起子拡散定数;結晶;非晶;分子内電荷移動;三重項励起子;ポーラロン;結晶性
      • Charge dynamics in planar heterojunctions
        Grant-in-Aid for Young Scientists (B)
        Kyoto University
        Yasunari Tamai
        From 01 Apr. 2017, To 31 Mar. 2019, Project Closed
        有機薄膜太陽電池;過渡吸収分光法;電荷分離;電荷再結合;共役高分子;光電変換;超短パルス分光;過渡吸収分光;ヘテロジャンクション
      • Exciton Dynamics in Crystalline Domains of Conjugated Polymers
        Grant-in-Aid for Scientific Research (A)
        Kyoto University
        Hideo OHKITA
        From 01 Apr. 2014, To 31 Mar. 2019, Project Closed
        一重項励起子拡散;共役高分子;励起子相互作用;J凝集;H凝集;結晶性;励起子拡散;次元性;超放射;一重項分裂;結晶性共役高分子;結晶化度;一重項励起子;三重項励起子;分子内電荷移動;励起子拡散定数;励起子カップリング;振動緩和;非緩和励起子;ダイナミクス;フェルスター

      External funds: others

      • スパース解析と遺伝的アルゴリズムの融合による新奇スペクトル分離手法の開発
        JSTさきがけ
        From 01 Oct. 2018, To 31 Mar. 2021
        代表
      list
        Last Updated :2022/06/29

        Education

        Teaching subject(s)

        • From 01 Apr. 2022, To 31 Mar. 2023
          Polymer Physical Properties
          D652, Spring, Graduate School of Engineering, 3
        • From Apr. 2017, To Mar. 2018
          Polymer Physical Properties
          Spring, 工学研究科
        • From Apr. 2018, To Mar. 2019
          Fundamental Chemical Experiments
          Spring, 全学共通科目
        • From Apr. 2018, To Mar. 2019
          Polymer Physical Properties
          Spring, 工学研究科
        • From Apr. 2019, To Mar. 2020
          Polymer Physical Properties
          Spring, 工学研究科
        • From Apr. 2020, To Mar. 2021
          Polymer Physical Properties
          Spring, 工学研究科
        • From Apr. 2021, To Mar. 2022
          Polymer Physical Properties
          Spring, 工学研究科

        Student achievements: Awards

        • 2016KIPS若手高分子シンポジウム優秀ポスター発表賞
          奥山拓夢, KIPS委員会, 09 Dec. 2016
        • 平成29年度吉田卒業研究・論文賞
          吉高一輝, 京都大学, 09 Jun. 2017
        • 第67回高分子学会年次大会優秀ポスター賞
          村田恭大, 高分子学会, 05 May 2018
        • 2018KIPS若手高分子シンポジウム 優秀ポスター賞
          吉高一輝, KIPS委員会, 14 Dec. 2018
        • 令和元年度吉田卒業研究・論文賞
          齋藤俊晴, 京都大学工学研究科, 26 Jun. 2019

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