Details of the Researcher

PHOTO

Tomoki Nishiyama
Section
Institute for Materials Research
Job title
Assistant Professor
Degree
e-Rad No.
51018536

Research History 1

  • 2025/04 - Present
    Tohoku University　Institute for Materials Research

Education 3

  • Kindai University　Graduate School of Science and Engineering Research

    2022/04 - 2025/03

  • Kindai University　Graduate School of Science and Engineering Research

    2020/04 - 2022/03

  • Kindai University　Faculty of Science and Engineering

    2016/04 - 2020/03

Professional Memberships 2

  • 錯体化学会

    2019/04 - Present

  • 日本化学会

    2019/04 - Present

Research Interests 8

  • リチウムイオン二次電池

  • 有機電界効果トランジスタ

  • 有機EL

  • 有機薄膜太陽電池

  • 発光特性

  • 電気伝導性

  • 多孔性金属錯体

  • MOF

Research Areas 2

  • Nanotechnology/Materials / Functional solid-state chemistry /

  • Nanotechnology/Materials / Inorganic and coordination chemistry /

Papers 8

  1. Carrier Mobility and Luminescence Properties of a One-Step Synthesized π-Extended Diketopyrrolopyrrole Derivative

    Tomoki Nishiyama, Taiki Yamaoka, Kento Nakajima, Shogo Nakajima, Zi Lang Goo, Ryohei Akiyoshi, Hirotaka Kitoh-Nishioka, Senku Tanaka, Kunihisa Sugimoto, Daisuke Tanaka, Takashi Okubo

    ACS Omega　2025/03/11

    DOI： 10.1021/acsomega.4c11150 　

    ISSN： 2470-1343

  2. Platinum–Acetylide Complexes as Nonfullerene Acceptors in Organic Photovoltaic Systems

    Tomoki Nishiyama, Taiki Yamaoka, Zi Lang Goo, Hirotaka Kitoh-Nishioka, Senku Tanaka, Kunihisa Sugimoto, Takashi Okubo

    Inorganic Chemistry　2024/12/20

    DOI： 10.1021/acs.inorgchem.4c04160 　

    ISSN： 0020-1669 1520-510X

  3. Dye‐Containing Polymers with π‐Extened Diketopyrropyrrole Derivatives for Semi‐Transparent Organic Photovoltaics

    Tomoki Nishiyama, Taiki Yamaoka, Kento Nakajima, Weichun Weng, Sota Nakano, Taro Yamamoto, Senku Tanaka, Tomonari Wakabayashi, Hal Suzuki, Hirotaka Kitoh‐Nishioka, Takashi Okubo

    ChemPlusChem　2024/12

    DOI： 10.1002/cplu.202400350 　

    ISSN： 2192-6506

    More details Close

    <jats:title>Abstract</jats:title><jats:p>Dye‐containing polymers <jats:bold>P1</jats:bold> (<jats:bold>PEDPP‐OT‐BDT</jats:bold>) and <jats:bold>P2</jats:bold> (<jats:bold>PEDPP‐OT‐BDTT</jats:bold>) including a π‐extended diketopyropyrrole (DPP) derivative and electron‐rich thiophene fused ring units (4,8‐bis((2‐ethylhexyl)oxy)benzo[1,2‐<jats:italic>b</jats:italic>:4,5‐<jats:italic>b</jats:italic>′]dithiophene for <jats:bold>P1</jats:bold> and 4,8‐bis(5‐(2‐ethylhexyl)thiophen‐2‐yl)benzo[1,2‐<jats:italic>b</jats:italic>:4,5‐<jats:italic>b</jats:italic>′]dithiophene for <jats:bold>P2</jats:bold>) were synthesized as narrow band gap dyes. A π‐extended DPP (EDPP‐OT‐BrPh), fragment of the polymers <jats:bold>P1</jats:bold> and <jats:bold>P2</jats:bold>, was obtained by extending the π‐conjugation of DPP using Ru(III)‐catalyzed C−H and N−H activation reported by Gońka <jats:italic>et al</jats:italic>. in 2019, exhibiting a high quantum yield (ϕ<jats:sub>em</jats:sub>=0.84) and small HOMO‐LUMO gap (<jats:italic>E</jats:italic><jats:sub>g</jats:sub>=1.69 eV) due to the spatial overlap of the HOMO and LUMO orbitals. The solubility of the π‐extended DPP was improved by introducing four 2‐octylthophene side chains around the periphery of the planer dye moiety, while maintaining the high planarity of the dye molecule, which is essential to the function of optoelectronic devices. As a result, <jats:bold>P1</jats:bold> and <jats:bold>P2</jats:bold>, polymerized with the π‐extended DPP and BDT derivatives, exhibit carrier mobility of approximately 10<jats:sup>−5</jats:sup> cm<jats:sup>2</jats:sup>/Vs in organic field‐effect transistors (OFETs). In bulk heterojunction (BHJ) solar cells with [6,6]‐phenyl‐C<jats:sub>61</jats:sub>‐butyric acid methyl ester (PCBM), they demonstrate a power conversion efficiency (PCE) of 1.0 % with an average transmittance (AVTs) of around 60 %.</jats:p>

  4. Synthesis, characterization, and OFET characteristics of p-type organic semiconductors incorporating diketopyrrolopyrrole and thiadiazole-quinoxaline acceptors

    Naohiro Takahashi, Tomoki Nishiyama, Weichun Weng, Yuki Miwa, Shinsuke Marumoto, Hirotaka Kitoh-Nishioka, Senku Tanaka, Takashi Okubo

    Chemistry Letters　2024/06/01

    DOI： 10.1093/chemle/upae115 　

    ISSN： 0366-7022 1348-0715

    More details Close

    <jats:title>Abstract</jats:title> <jats:p>P-type Organic Semiconductors, TQx5-BT-DPP8 (1a) and TQx5-BT-DPP20 (1b), consisting of a donor unit of bithiophene (BT) and two acceptor units of thiadiazole quinoxaline (TQx) and diketopyrrolopyrrole (DPP), were synthesized, and their electronic states and physical properties were elucidated. These semiconductors demonstrate strong absorption extending from the visible to the near-infrared region, functioning effectively as strong donor dyes. The organic field-effect transistors (OFETs) exhibited normally on transistor characteristics, with carrier mobilities of 1.1 × 10−3 cm2/Vs for 1a and 3.3 × 10−4 cm2/Vs for 1b.</jats:p>

  5. A copper(i) thiocyanate-based photoresponsive semiconducting 2D coordination polymer

    Tomoki Nishiyama, Hirotaka Kitoh-Nishioka, Senku Tanaka, Masahiko Maekawa, Takayoshi Kuroda-Sowa, Masaki Yoshida, Masako Kato, Takashi Okubo

    Dalton Transactions　2024

    DOI： 10.1039/D3DT03125J 　

  6. Dinuclear cobalt complexes with an asymmetric biphenyl bridging ligand, [Co2(LFBu)(bpqa)2](PF6)2 (H4LFBu = 5-fluoro-5′-tert-butyl-3,3′,4,4′-tetrahydroxybiphenyl, bpqa = bis(2-pyridylmethyl)(2-quinolylmethyl)amine): Spectroscopic, electrochemical and magnetic characterization

    Naohiro Takahashi, Tomoki Nishiyama, Takuto Mibu, Yusaku Suenaga, Takashi Okubo, Masahiko Maekawa, Takayoshi Kuroda-Sowa

    Inorganica Chimica Acta　2022/10

    DOI： 10.1016/j.ica.2022.121095 　

    ISSN： 0020-1693

  7. Synthesis, crystal structures and characterization of Nickel(II) complexes with dithiobenzoate derivatives

    Tomoki Nishiyama, Naohiro Takahashi, Takuto Mibu, Masahiko Maekawa, Takayoshi Kuroda-Sowa, Yusaku Suenaga, Takashi Okubo

    Results in Chemistry　2022/01

    DOI： 10.1016/j.rechem.2022.100470 　

    ISSN： 2211-7156

  8. Crystal Structure of an Iodido-bridged Dinuclear Copper(I) Complex with 3,6-Bis(dimethylamino)acridine

    Misaki OHKITA, Aya FUJIWARA, Tomoki NISHIYAMA, Masahiko MAEKAWA, Takayoshi KURODA-SOWA, Takashi OKUBO

    X-ray Structure Analysis Online　2021/06/10

    DOI： 10.2116/xraystruct.37.29 　

    ISSN： 1883-3578

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