Details of the Researcher

PHOTO

Kohsuke Kawabata
Section
Graduate School of Science
Job title
Associate Professor
Degree

  • Ph.D (University of Tsukuba)

Research History 7

  • 2024/04 - Present
    Tohoku Unversity　Graduate School of Science Department of Chemistry

  • 2017/08 - Present
    RIKEN　Center for Emergent Matter Science (CEMS)　Visiting Scientist

  • 2017/08 - Present
    Tohoku University　Graduate School of Science, Department of Chemistry　Assistant Professor

  • 2017/02 - 2017/07
    RIKEN　Center for Emergent Matter Science (CEMS)　Research Scientist

  • 2015/02 - 2017/01
    Yale Univeristy　Department of Chemical and Environmental Engineering　JSPS Overseas Research Fellow

  • 2013/04 - 2015/01
    RIKEN　Center for Emergent Matter Science (CEMS)　Postdoctoral researcher

  • 2010/04 - 2013/03
    University of Tsukuba　Graduate School of Pure and Applied Sciences　JSPS Research Fellow (DC1)

Show all Show first 5

Education 2

  • University of Tsukuba　Graduate School of Pure and Applied Sciences　Institute of Materials Science

    2008/04 - 2013/03

  • University of Tsukuba　College of Engineering Sciences

    2004/04 - 2008/03

Professional Memberships 1

  • THE CHEMICAL SOCIETY OF JAPAN

Research Interests 5

  • 液晶

  • 有機半導体

  • π共役系高分子

  • 有機機能材料化学

  • organic electronics

Research Areas 2

  • Nanotechnology/Materials / Functional solid-state chemistry /

  • Nanotechnology/Materials / Organic functional materials /

Awards 7

  1. 若い世代の特別講演賞

    2026/03　日本化学会

  2. 令和3年度 花王科学奨励賞

    2021/06　花王芸術・科学財団

  3. The Ninth International Forum on Chemistry of Functional Organic Chemicals (IFOC-9) Best Poster Award

    2018/11

  4. 優秀講演賞（学術）

    2018/03　日本化学会

  5. CSJ化学フェスタ 最優秀ポスター賞

    2012/10　日本化学会

  6. Journal of Materials Chemistry poster prize

    2012/07　ICSM2012 (Royal Society of Chemistry)

  7. 繊維学会年次大会 若手ポスター賞

    2011/06　繊維学会

Show all ︎Show 5

Papers 79

  1. Significant decrease in the ionization energy of dinaphtho[2,3- b :2′,3′- f ]thieno[3,2- b ]thiophene (DNTT) solid induced by a pinacolborane group

    Kazuo Takimiya, Sayaka Usui, Ryota Hanaki, Kirill Bulgarevich, Kohsuke Kawabata, Kyohei Nakano, Keisuke Tajima

    Materials Horizons　2026

    Publisher: Royal Society of Chemistry (RSC)

    DOI： 10.1039/d5mh01969a 　

    ISSN： 2051-6347

    eISSN： 2051-6355

    More details Close

    A pinacolborane (Bpin) group attached to dinaphtho[2,3- b :2′,3′- f ]thieno[3,2- b ]thiophene (DNTT) significantly reduced the ionization energy of the DNTT solid via reducing the vacuum level, leading to enhancing the carrier density by air-oxidation.

  2. Extension of the π-conjugated core of methylchalcogenolated polycyclic aromatic hydrocarbons: synthesis and characterization of 1,4,7,10-tetrakis(methylthio)- and tetramethoxy-coronene. International-journal Peer-reviewed

    Prasanta Pal, Kirill Bulgarevich, Ryota Hanaki, Kohsuke Kawabata, Kazuo Takimiya

    Chemical science　16　(34)　15368-15377　2025/08/27

    DOI： 10.1039/d5sc03215f 　

    More details Close

    Controlling the crystal structures of polycyclic aromatic hydrocarbons (PAHs) by regioselective methyl chalcogenolation is an effective strategy for realizing superior molecular semiconductors showing ultrahigh mobility, as exemplified by methylthiolated pyrene and peropyrene. Following the strategy, we designed and synthesized 1,4,7,10-tetrakis(methylthio)coronene (MT-coronene) and 1,4,7,10-tetramethoxycoronene (MO-coronene) as potential candidates for high-performance molecular semiconductors. Since the coronene core is highly symmetric, the regioselective functionalization at the 1, 4, 7, and 10-positions seemed to be challenging, and thus, we tested two strategies for constructing such regio-selectively functionalized coronene derivatives: one was the direct functionalization of the parent coronene via the iridium-catalyzed borylation reaction, and the other was the stepwise construction of the coronene core with functionalized naphthalene derivatives. Interestingly, the former was suitable for the synthesis of MT-coronene, whereas the latter was suitable for MO-coronene. The crystal structures of MT- and MO-coronene were significantly different from the γ-structure of their parent and were classified into the brickwork and the sandwich herringbone structure, respectively. In accordance with the brickwork crystal structures with isotropic but small intermolecular HOMO overlaps, the MT-coronene-based single-crystal field-effect transistors (SC-FETs) showed decent transistor responses with a carrier mobility of up to 0.5 cm2 V-1 s-1. On the other hand, the SC-FETs of MO-coronene, the solid-state electronic structure of which was zero-dimensional due to the sandwich herringbone structure, were far inferior to those of MT-coronene. Based on the crystal structures and theoretical calculations on MT- and MO-coronene, we analyzed the tendency of the intermolecular interactions and intermolecular HOMO overlaps in the solid state, which explains the performances of the coronene system as molecular semiconductors. Furthermore, we compared the solid-state structures of a series of methylthiolated PAHs, pyrene, perylene, peropyrene, and coronene, to determine the differences in their performances as molecular semiconductors, which gave us new insights into the relationship between the molecular structure, packing, and electronic structure in the solid state, providing perspectives for superior molecular semiconductors.

  3. 3-Dicyanomethylene-Substituted Thienothiophenes as the Terminal Units in Non-Fullerene Electron Acceptor Molecules for Organic Photovoltaics. International-journal Peer-reviewed

    Kensuke Shibahashi, Masato Nakamura, Kohsuke Kawabata, Kazuo Takimiya

    Chemistry, an Asian journal　20　(16)　e00524　2025/08

    DOI： 10.1002/asia.202500524 　

    More details Close

    A series of dicyanomethylene-substituted thieno[3,2-b]- and thieno[2,3-b]-thiophenes and their α-halogenated derivatives (CNTTs) were developed as electron-withdrawing terminal units of non-fullerene acceptors (NFAs) for bulk heterojunction organic photovoltaics (OPVs). The series of CNTTs was combined with a [1,2,5]thiadiazolo[3,4-e]thieno[2'',3'':4',5']thieno[2',3':4,5]pyrrolo[3,2-g]thieno[2',3':4,5]thieno[3,2-b]indole (BTP) unit, the electron-donating core of Y6, a representative NFA, to afford a series of NFAs (BTP-CNTTs). The BTP-CNTTs, particularly the ones with α-chlorinated or brominated CNTT units, exhibit longer absorption wavelengths than that of Y6 and have low-lying LUMO energy levels comparable to that of Y6. Bulk heterojunction OPV devices based on the BTP-CNTTs blended with a representative donor polymer, PBDB-T, exhibited power conversion efficiencies of over 10% under AM1.5 irradiation. These results suggest that the CNTTs are good candidates as electron acceptor building units for NFAs or n-type organic semiconductors.

  4. Isoelectronic Substitution of a High‐performance Organic Semiconductor with Selenium Atoms: Synthesis and Characterization of Methylthiolated Dibenzo[cd,gh][2,5]diselenapentalene Peer-reviewed

    Kazuo Takimiya, Kamon Sahara, Masashi Inoue, Kirill Bulgarevich, Kohsuke Kawabata

    Asian Journal of Organic Chemistry　14　(5)　2025/05/05

    Publisher: Wiley

    DOI： 10.1002/ajoc.202500173 　

    ISSN： 2193-5807

    eISSN： 2193-5815

    More details Close

    Abstract A selenium variant of one of the best molecular semiconductors, 1,3,6,8‐tetrakis(methylthio)pyrene (MT‐pyrene), namely 1,3,5,7‐tetrakis(methylthio)dibenzo[cd,gh][2,5]diselenapentalene (1), was designed, synthesized, and fully characterized through single‐crystal X‐ray analysis and single‐crystal field‐effect transistors. Although the crystal structure of 1 was a brickwork‐related structure similar to that of MT‐pyrene, the transport properties of 1 were far inferior to that of MT‐pyrene. This is attributed to subtle differences in the crystal structure, where the large displacement along the molecular short‐axis direction diminishes the efficient two‐dimensional overlap of HOMO. Since such displacement can be caused by steric congestion of three chalcogen atoms at both sides of 1, two from the methylthio group and one from the core, we also synthesized 1,5‐bis(methylthio)dibenzo[cd,gh][2,5]diselenapentalene (2). However, 2 gave a less intermolecularly interactive crystal structure or one‐dimensional anisotropic structure, which were also not promising as molecular semiconductors, judging from the calculated electronic structures in the solid state. As the selenium‐containing core, dibenzo[cd,gh][2,5]diselenapentalene, has an isoelectronic molecular structure with pyrene and a smaller reorganization energy than pyrene, it is expected to be a promising π‐conjugated structure as organic semiconductors. However, methylthiolation was concluded not to be a suitable molecular‐design strategy to bring out the potential of the core.

  5. Core- versus End-Alkylation: Tailoring Solid-State Structures and Properties of Near-Infrared-Absorbing Organic Semiconductors Based on Naphthodithiophenediones Peer-reviewed

    Kohsuke Kawabata, Kiyohito Mashimo, Kazuo Takimiya

    Chemistry of Materials　2024/12/04

    Publisher: American Chemical Society (ACS)

    DOI： 10.1021/acs.chemmater.4c02436 　

    ISSN： 0897-4756

    eISSN： 1520-5002

  6. Quinoidal π-extension of dipyranylidene derivatives: towards efficient dopants for n-type organic semiconductors Peer-reviewed

    Takaya Matsuo, Kohsuke Kawabata, Kazuo Takimiya

    Organic Chemistry Frontiers　11　(17)　4682-4688　2024/07/03

    DOI： 10.1039/d4qo00961d 　

    ISSN： 2052-4110

    eISSN： 2052-4129

  7. A Novel N-Type Molecular Dopant With a Closed-Shell Electronic Structure Applicable to the Vacuum-Deposition Process. International-journal Peer-reviewed

    Takaya Matsuo, Kohsuke Kawabata, Kazuo Takimiya

    Advanced materials (Deerfield Beach, Fla.)　36　(15)　e2311047　2024/04

    DOI： 10.1002/adma.202311047 　

    More details Close

    Rational design, synthesis, and characterization of a new efficient versatile n-type dopant with a closed-shell electronic structure are described. By employing the tetraphenyl-dipyranylidene (DP0) framework with two 7π-electron systems modified with N,N-dimethylamino groups as the strong electron-donating substituent, 2,2',6,6'-tetrakis[4-(dimethylamino)phenyl]-4,4'-dipyranylidene (DP7), a closed-shell molecule with an extremely high-lying energy level of the highest occupied molecular orbital, close to 4.0 eV below the vacuum level, is successfully developed. Thanks to its thermal stability, DP7 is applicable to vacuum deposition, which allows utilization of DP7 in bulk doping for the development of n-type organic thermoelectric materials and contact doping for reducing contact resistance in n-type organic field-effect transistors. As vacuum-deposition processable n-type dopants are very limited, DP7 stands out as a useful n-type dopant, particularly for the latter purpose.

  8. Crystal-Structure Control of Molecular Semiconductors by Methylthiolation: Toward Ultrahigh Mobility. International-journal Peer-reviewed

    Kazuo Takimiya, Kirill Bulgarevich, Kohsuke Kawabata

    Accounts of chemical research　57　(6)　884-894　2024/03/19

    DOI： 10.1021/acs.accounts.3c00756 　

    More details Close

    ConspectusThe crystal structure of organic semiconductors has been regarded as one of the crucial factors for realizing high-performance electronic devices, such as organic field-effect transistors. However, although the control of crystal structures of organic semiconductors has been examined in the last two decades of intensive efforts of the development of organic semiconductors, active measures to control crystal structures enabling high carrier mobility are still limited. In 2016, our research group noticed that regioselective methylthiolation could provide a selective crystal structure change from an ordinary herringbone structure to a pitched π-stacking structure, similar to the crystal structure of rubrene, in the benzo[1,2-b:4,5-b']dithiophene (BDT) system. Following this serendipitous finding, our group systematically investigated the relationship between the molecular and crystal structures of a range of methylthiolated aromatic and heteroaromatic compounds.This Account provides a comprehensive overview of our research efforts and advancements in the development of methylthiolated small-molecule-based organic semiconductors (molecular semiconductors). We first describe the outline of the past development of molecular semiconductors, focusing on the types of crystal structures of high-performance molecular semiconductors. Then, we describe our findings on the drastic crystal structure change in the BDT system upon methylthiolation, detailing the causes of the change in terms of the intermolecular contacts and intermolecular interaction energies. This is followed by the confirmation of the generality of the crystal-structure change by methylthiolation of a series of acene and heteroacenes, where the herringbone structure in the parent system is unexceptionally transformed into the pitched π-stacking structure, a promising crystal structure for high-mobility molecular semiconductors well exemplified by the prototypical molecular semiconductor, rubrene. In fact, the methylthiolated anthradithiophene afforded comparable high mobility to rubrene in single-crystal field-effect transistors. Then, we demonstrate that the sandwich herringbone structures of peri-condensed polycyclic aromatic hydrocarbons, including pyrene, perylene, and peropyrene, change into brickwork crystal structures upon methylthiolation and that, among these compounds, very promising molecular semiconductors, methylthiolated pyrene and peropyrene, showing ultrahigh mobility of 30 cm2 V s-1, are realized.Through the studies, by gaining insights into the underlying mechanisms driving the crystal structure changes, we lay a strong foundation for tackling challenges related to controlling the crystal structures and developing high-performance molecular semiconductors. This will be a distinct approach from the past activities in the development of molecular semiconductors that mainly focused on molecules themselves, including their synthesis, properties, and characterization. We thus anticipate that our findings and the present Account will open the door to a new era of the development of molecular semiconductors.

  9. Quinoidal Acenedichalcogenophenediones for Near-Infrared-Absorbing Organic Semiconductors: Effects of Chalcogen Atom Substitution on the Physicochemical and Carrier Transport Properties Peer-reviewed

    Kohsuke Kawabata, Kazuo Takimiya

    CHEMISTRY OF MATERIALS　35　(18)　7628-7642　2023/09

    DOI： 10.1021/acs.chemmater.3c01350 　

    ISSN： 0897-4756

    eISSN： 1520-5002

  10. Methylthiolation of Acenes: Change of Crystal Structure from Herringbone to Rubrene-like Pitched & pi;-Stacking Structure Peer-reviewed

    Kiseki Kanazawa, Kirill Bulgarevich, Kohsuke Kawabata, Kazuo Takimiya

    CRYSTAL GROWTH & DESIGN　23　(8)　5941-5949　2023/07

    DOI： 10.1021/acs.cgd.3c00525 　

    ISSN： 1528-7483

    eISSN： 1528-7505

  11. Uncovered Effects of thieno[2,3-b]thiophene Substructure in a Tetrathienoacene Backbone: Reorganization Energy and Intermolecular Interaction Peer-reviewed

    Kiseki Kanazawa, Kirill Bulgarevich, Kohsuke Kawabata, Kazuo Takimiya

    CHEMISTRY OF MATERIALS　2022/12

    DOI： 10.1021/acs.chemmater.2c03160 　

    ISSN： 0897-4756

    eISSN： 1520-5002

  12. What Defines a Crystal Structure? Effects of Chalcogen Atoms in 3,7-Bis(methylchalcogeno)benzo[1,2-b:4,5-b ']dichalcogenophene-Based Organic Semiconductors(dagger) Peer-reviewed

    Kazuo Takimiya, Kirill Bulgarevich, Kamon Sahara, Kiseki Kanazawa, Hiroyuki Takenaka, Kohsuke Kawabata

    CHINESE JOURNAL OF CHEMISTRY　40　(21)　2546-2558　2022/11

    DOI： 10.1002/cjoc.202200302 　

    ISSN： 1001-604X

    eISSN： 1614-7065

  13. "Heavy-atom effects" in the parent [1]benzochalcogenopheno[3,2-b][1]benzochalcogenophene system (vol 8, pg 15119, 2020) Peer-reviewed

    Chengyuan Wang, Mamatimin Abbas, Guillaume Wantz, Kohsuke Kawabata, Kazuo Takimiya

    JOURNAL OF MATERIALS CHEMISTRY C　10　(32)　11810-11810　2022/08

    DOI： 10.1039/d2tc90146c 　

    ISSN： 2050-7526

    eISSN： 2050-7534

  14. Effects of Conformation on Doping Efficiency in pi-Extended Bipyranylidene Molecules: Relationship between Molecular Structure and Electron-Doping Ability for Developing n-Type Organic Thermoelectrics

    Takaya Matsuo, Kohsuke Kawabata, Kazuo Takimiya

    BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN　95　(7)　1047-1053　2022/07

    DOI： 10.1246/bcsj.20220124 　

    ISSN： 0009-2673

    eISSN： 1348-0634

  15. Bandlike versus Temperature-IndependentCarrier Transport in IsomericDiphenyldinaphtho[2,3-b:2 ',3 '-f]thieno[3,2-b]thiophenes Peer-reviewed

    Kazuo Takimiya, Kirill Bulgarevich, Shingo Horiuchi, Aoi Sato, Kohsuke Kawabata

    ACS MATERIALS LETTERS　4　(4)　675-681　2022/04

    DOI： 10.1021/acsmaterialslett.2c00084 　

    eISSN： 2639-4979

  16. Packing structures of (trialkylsilyl)ethynyl-substituted dinaphtho[2,3-b:2 ',3 '-f]thieno[3,2-b]thiophenes (DNTTs): effects of substituents on crystal structures and transport properties Peer-reviewed

    Kazuo Takimiya, Sayaka Usui, Aoi Sato, Kiseki Kanazawa, Kohsuke Kawabata

    JOURNAL OF MATERIALS CHEMISTRY C　10　(7)　2775-2782　2022/02

    DOI： 10.1039/d1tc04312a 　

    ISSN： 2050-7526

    eISSN： 2050-7534

  17. Enantiopure 2-(2-ethylhexyl)dinaphtho[2,3-b:2 ',3 '-f]thieno[3,2-b]thiophenes: synthesis, single-crystal structure and a surprising lack of influence of stereoisomerism on thin-film structure and electronic properties Peer-reviewed

    Kenta Sumitomo, Yuta Sudo, Kiseki Kanazawa, Kohsuke Kawabata, Kazuo Takimiya

    MATERIALS HORIZONS　9　(1)　444-451　2022/01

    DOI： 10.1039/d1mh01119g 　

    ISSN： 2051-6347

    eISSN： 2051-6355

  18. Quinoid-Aromatic Resonance for Very Small Optical Energy Gaps in Small-Molecule Organic Semiconductors: A Naphthodithiophenedione-oligothiophene Triad System Peer-reviewed

    Kohsuke Kawabata, Kazuo Takimiya

    CHEMISTRY-A EUROPEAN JOURNAL　27　(63)　15660-15670　2021/11

    DOI： 10.1002/chem.202102663 　

    ISSN： 0947-6539

    eISSN： 1521-3765

  19. Highly Electron-Donating Bipyranylidene Derivatives: Potential n-Type Dopants for Organic Thermoelectrics Peer-reviewed

    Takaya Matsuo, Kohsuke Kawabata, Kazuo Takimiya

    ADVANCED ENERGY AND SUSTAINABILITY RESEARCH　2　(11)　2021/11

    DOI： 10.1002/aesr.202100084 　

    ISSN： 2699-9412

  20. "Manipulation" of Crystal Structure by Methylthiolation Enabling Ultrahigh Mobility in a Pyrene-Based Molecular Semiconductor Peer-reviewed

    Kazuo Takimiya, Kirill Bulgarevich, Mamatimin Abbas, Shingo Horiuchi, Takuya Ogaki, Kohsuke Kawabata, Abduleziz Ablat

    ADVANCED MATERIALS　33　(32)　2021/08

    DOI： 10.1002/adma.202102914 　

    ISSN： 0935-9648

    eISSN： 1521-4095

  21. Crystal Structures of beta-Methylchalcogenated Tetrathienoacenes: From One-Dimensional pi-Stacking to Sandwich Pitched pi-Stacking Structure Peer-reviewed

    Kazuo Takimiya, Kiseki Kanazawa, Kohsuke Kawabata

    CRYSTAL GROWTH & DESIGN　21　(7)　4055-4063　2021/07

    DOI： 10.1021/acs.cgd.1c00347 　

    ISSN： 1528-7483

    eISSN： 1528-7505

  22. Nanoscale Thickness Control of Nanoporous Films Derived from Directionally Photopolymerized Mesophases

    Omar Q. Imran, Na Kyung Kim, Lauren N. Bodkin, Gregory E. Dwulet, Xunda Feng, Kohsuke Kawabata, Menachem Elimelech, Douglas L. Gin, Chinedum O. Osuji

    Advanced Materials Interfaces　8　(5)　2001977-2001977　2021/03

    Publisher: Wiley

    DOI： 10.1002/admi.202001977 　

    ISSN： 2196-7350

    eISSN： 2196-7350

  23. Relating Selectivity and Separation Performance of Lamellar Two-Dimensional Molybdenum Disulfide (MoS2) Membranes to Nanosheet Stacking Behavior

    Xinglin Lu, Uri R. Gabinet, Cody L. Ritt, Xunda Feng, Akshay Deshmukh, Kohsuke Kawabata, Masashi Kaneda, Sara M. Hashmi, Chinedum O. Osuji, Menachem Elimelech

    Environmental Science & Technology　54　(15)　9640-9651　2020/08/04

    Publisher: American Chemical Society (ACS)

    DOI： 10.1021/acs.est.0c02364 　

    ISSN： 0013-936X

    eISSN： 1520-5851

  24. Carbonyl-Terminated Quinoidal Oligothiophenes as p-Type Organic Semiconductors

    Takato Asoh, Kohsuke Kawabata, Kazuo Takimiya

    Materials　13　(13)　3020-3020　2020/07/06

    Publisher: MDPI AG

    DOI： 10.3390/ma13133020 　

    eISSN： 1996-1944

    More details Close

    A series of quinoidal oligothiophenes terminated with carbonyl groups (nTDs, n = 2–4) are studied as p-type organic semiconductors for the active materials in organic field-effect transistors (OFETs) both by the theoretical and experimental approaches. The theoretical calculations clearly show their high-lying highest occupied molecular orbital (HOMO) energy levels (EHOMOs), small reorganization energies for hole transport (λholes), and large contribution of sulfur atoms to HOMOs, all of which are desirable for p-type organic semiconductors. Thus, we synthesized nTDs from the corresponding aromatic oligothiophene precursors and then evaluated their physicochemical properties and structural properties. These experimental evaluations of nTDs nicely proved the theoretical predictions, and the largest 4TDs in the series (4,4′′′-dihexyl- and 3′,4,4″,4′′′-tetrahexyl-5H,5′′′H-[2,2′:5′,2″:5″,2′′′-quaterthiophene]-5,5′′′-dione) can afford solution-processed OFETs showing unipolar p-type behaviors and hole mobility as high as 0.026 cm2 V−1 s−1.

  25. Crystal Structures of Dimethoxyanthracens: A Clue to a Rational Design of Packing Structures of π‐Conjugated Molecules

    Kazuo Takimiya, Takuya Ogaki, Chengyuan Wang, Kohsuke Kawabata

    Chemistry – An Asian Journal　15　(6)　915-919　2020/03/16

    Publisher: Wiley

    DOI： 10.1002/asia.201901756 　

    ISSN： 1861-4728

    eISSN： 1861-471X

  26. Synthesis of Soluble Dinaphtho[2,3-b:2′,3′-f]thieno[3,2-b]thiophene (DNTT) Derivatives: One-Step Functionalization of 2-Bromo-DNTT

    Kohsuke Kawabata, Sayaka Usui, Kazuo Takimiya

    The Journal of Organic Chemistry　85　(1)　195-206　2020/01/03

    Publisher: American Chemical Society (ACS)

    DOI： 10.1021/acs.joc.9b02585 　

    ISSN： 0022-3263

    eISSN： 1520-6904

  27. “Disrupt and induce” intermolecular interactions to rationally design organic semiconductor crystals: from herringbone to rubrene-like pitched π-stacking

    Chengyuan Wang, Daisuke Hashizume, Masahiro Nakano, Takuya Ogaki, Hiroyuki Takenaka, Kohsuke Kawabata, Kazuo Takimiya

    Chemical Science　11　(6)　1573-1580　2020

    Publisher: Royal Society of Chemistry (RSC)

    DOI： 10.1039/c9sc05902d 　

    ISSN： 2041-6520

    eISSN： 2041-6539

    More details Close

    <p>The rational design of organic semiconductor crystals is realized by β-methylthionation of acenedithiophenes through manipulating intermolecular interactions in a “disrupt and induce” manner.</p>

  28. “Heavy-atom effects” in the parent [1]benzochalcogenopheno[3,2-b][1]benzochalcogenophene system

    Chengyuan Wang, Mamatimin Abbas, Guillaume Wantz, Kohsuke Kawabata, Kazuo Takimiya

    Journal of Materials Chemistry C　8　(43)　15119-15127　2020

    Publisher: Royal Society of Chemistry (RSC)

    DOI： 10.1039/d0tc01408g 　

    ISSN： 2050-7526

    eISSN： 2050-7534

    More details Close

    <p>Effects of the chalcogen atoms in [1]benzochalcogenopheno[3,2-<italic>b</italic>][1]benzochalcogenophenes (BXBXs), the key π-conjugated core structures in the development of superior organic semiconductors, are investigated.</p>

  29. Selenium-Substituted beta-Methylthiobenzo[1,2-b:4,5-b ']dithiophenes: Synthesis, Packing Structure, and Transport Properties

    Takenaka Hiroyuki, Ogaki Takuya, Wang Chengyuan, Kawabata Kohsuke, Takimiya Kazuo

    CHEMISTRY OF MATERIALS　31　(17)　6696-6705　2019/09/10

    DOI： 10.1021/acs.chemmater.9b01187 　

    ISSN： 0897-4756

  30. Precise nanofiltration in a fouling-resistant self-assembled membrane with water-continuous transport pathways Peer-reviewed

    Feng Xunda, Imran Qaboos, Zhang Yizhou, Sixdenier Lucas, Lu Xinglin, Kaufman Gilad, Gabinet Uri, Kawabata Kohsuke, Elimelech Menachem, Osuji Chinedum O

    SCIENCE ADVANCES　5　(8)　2019/08

    DOI： 10.1126/sciadv.aav9308 　

    ISSN： 2375-2548

  31. Single crystal texture by directed molecular self-assembly along dual axes. Peer-reviewed

    Feng X, Kawabata K, Cowan MG, Dwulet GE, Toth K, Sixdenier L, Haji-Akbari A, Noble RD, Elimelech M, Gin DL, Osuji CO

    Nature materials　2019/06

    DOI： 10.1038/s41563-019-0389-1 　

    ISSN： 1476-1122

  32. Next-generation nanofiltration membranes based on aligned and bicontinuous self-assembled systems Peer-reviewed

    Osuji Chinedum, Feng Xunda, Imran Qaboos, Kawabata Kohsuke, Lu Xinglin, Sixdenier Lucas, Kaufman Gilad, Gabinet Uri, Elimelech Menachem

    ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY　257　2019/03/31

    ISSN： 0065-7727

  33. Thienoquinoidal System: Promising Molecular Architecture for Optoelectronic Applications Invited Peer-reviewed

    Kazuo Takimiya, Kohsuke Kawabata

    Journal of Synthetic Organic Chemistry, Japan　76　(11)　1176-1184　2018/11

  34. Controlling orientational order in block copolymers using low-intensity magnetic fields Peer-reviewed

    Manesh Gopinadhan, Youngwoo Choo, Kohsuke Kawabata, Gilad Kaufman, Xunda Feng, Xiaojun Di, Yekaterina Rokhlenko, Lalit H. Mahajan, Dennis Ndaya, Rajeswari M. Kasi, Chinedum O. Osuji

    PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA　114　(45)　E9437-E9444　2017/11

    DOI： 10.1073/pnas.1712631114 　

    ISSN： 0027-8424

  35. Polymer Nanosheets from Supramolecular Assemblies of Conjugated Linoleic Acid-High Surface Area Adsorbents from Renewable Materials Peer-reviewed

    Xunda Feng, Kohsuke Kawabata, Dylan M. Whang, Chinedum O. Osuji

    LANGMUIR　33　(40)　10690-10697　2017/10

    DOI： 10.1021/acs.langmuir.7b02467 　

    ISSN： 0743-7463

  36. Induction of Helical Structure by Sesamin, and Production of Oriented Helical Polymer with Liquid Crystal Magneto-Electrochemical Polymerization Peer-reviewed

    Jiuchao Dong, Shigeki Nimori, Kohsuke Kawabata, Hiromasa Goto

    JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY　55　(11)　1894-1899　2017/06

    DOI： 10.1002/pola.28560 　

    ISSN： 0887-624X

    eISSN： 1099-0518

  37. Dithienyl Acenedithiophenediones as New -Extended Quinoidal Cores: Synthesis and Properties Peer-reviewed

    Kohsuke Kawabata, Itaru Osaka, Masanori Sawamoto, Jose L. Zafra, Paula Mayorga Burrezo, Juan Casado, Kazuo Takimiya

    CHEMISTRY-A EUROPEAN JOURNAL　23　(19)　4579-4589　2017/04

    DOI： 10.1002/chem.201605104 　

    ISSN： 0947-6539

    eISSN： 1521-3765

  38. Highly Selective Vertically Aligned Nanopores in Sustainably Derived Polymer Membranes by Molecular Templating Peer-reviewed

    Xunda Feng, Kohsuke Kawabata, Gilad Kaufman, Menachem Elimelech, Chinedum O. Osuji

    ACS NANO　11　(4)　3911-3921　2017/04

    DOI： 10.1021/acsnano.7b00304 　

    ISSN： 1936-0851

    eISSN： 1936-086X

  39. Effects of branching position of alkyl side chains on ordering structure and charge transport property in thienothiophenedione- and quinacridone-based semiconducting polymers Peer-reviewed

    Kohsuke Kawabata, Masahiko Saito, Noriko Takemura, Itaru Osaka, Kazuo Takimiya

    POLYMER JOURNAL　49　(1)　169-176　2017/01

    DOI： 10.1038/pj.2016.103 　

    ISSN： 0032-3896

    eISSN： 1349-0540

  40. Very Small Bandgap pi-Conjugated Polymers with Extended Thienoquinoids Peer-reviewed

    Kohsuke Kawabata, Masahiko Saito, Itaru Osaka, Kazuo Takimiya

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY　138　(24)　7725-7732　2016/06

    DOI： 10.1021/jacs.6b03688 　

    ISSN： 0002-7863

  41. A Poly(ter(3,4-ethylenedioxythiophene)) Showing Concentric-circle Morphology Prepared by Electrochemical Synthesis in Smectic A Liquid Crystal under Vertical Strong Magnetic Field Peer-reviewed

    Hiroki Hayashi, Kohsuke Kawabata, Shigeki Nimori, Hiromasa Goto

    CHEMISTRY LETTERS　45　(2)　170-172　2016/02

    DOI： 10.1246/cl.151066 　

    ISSN： 0366-7022

    eISSN： 1348-0715

  42. Synthesis and optical properties of poly(phenylenethiophene)s bearing conjugated side chains Peer-reviewed

    Hirotsugu Kawashima, Kohsuke Kawabata, Aohan Wang, Hiromasa Goto

    DESIGNED MONOMERS AND POLYMERS　18　(7)　661-668　2015/10

    DOI： 10.1080/15685551.2015.1070498 　

    ISSN： 1385-772X

    eISSN： 1568-5551

  43. Thienothiophene-2,5-Dione-Based Donor-Acceptor Polymers: Improved Synthesis and Influence of the Donor Units on Ambipolar Charge Transport Properties Peer-reviewed

    Kohsuke Kawabata, Itaru Osaka, Masahiro Nakano, Noriko Takemura, Tomoyuki Koganezawa, Kazuo Takimiya

    ADVANCED ELECTRONIC MATERIALS　1　(6)　2015/06

    DOI： 10.1002/aelm.201500039 　

    ISSN： 2199-160X

  44. Thiophene-based chiral small bandgap pi-conjugated polymers: synthesis and optical properties Peer-reviewed

    Aohan Wang, Kohsuke Kawabata, Hiromasa Goto

    DESIGNED MONOMERS AND POLYMERS　18　(4)　360-366　2015/05

    DOI： 10.1080/15685551.2015.1012625 　

    ISSN： 1385-772X

    eISSN： 1568-5551

  45. Synthesis, Properties, and Doping Behavior of Optically Active Polythiophenes Bearing a Bornyl Group Peer-reviewed

    Atsushi Matsumura, Kohsuke Kawabata, Hiromasa Goto

    MACROMOLECULAR CHEMISTRY AND PHYSICS　216　(9)　931-938　2015/05

    DOI： 10.1002/macp.201400594 　

    ISSN： 1022-1352

    eISSN： 1521-3935

  46. Intramolecular charge transfer (ICT) of a chiroptically active conjugated polymer showing green colour Peer-reviewed

    Hirotsugu Kawashima, Kohsuke Kawabata, Hiromasa Goto

    JOURNAL OF MATERIALS CHEMISTRY C　3　(5)　1126-1133　2015

    DOI： 10.1039/c4tc02124j 　

    ISSN： 2050-7526

    eISSN： 2050-7534

  47. Intramolecular charge transfer (ICT) of a chiroptically active conjugated polymer showing green colour (vol 3, pg 1126, 2015) Peer-reviewed

    Hirotsugu Kawashima, Kohsuke Kawabata, Hiromasa Goto

    JOURNAL OF MATERIALS CHEMISTRY C　3　(5)　1142-1142　2015

    DOI： 10.1039/c5tc90019k 　

    ISSN： 2050-7526

    eISSN： 2050-7534

  48. Synthesis and characterization of a novel donor-acceptor- donor chiral inducer and its application in electrochemical polymerization Peer-reviewed

    Jiuchao Dong, Kohsuke Kawabata, Hiromasa Goto

    JOURNAL OF MATERIALS CHEMISTRY C　3　(9)　2024-2032　2015

    DOI： 10.1039/c4tc02489c 　

    ISSN： 2050-7526

    eISSN： 2050-7534

  49. Water soluble polyaniline/polysaccharide composite: Polymerization, carbonization to yield carbon micro-bubbles Peer-reviewed

    Kuniharu Nakajima, Kohsuke Kawabata, Hiromasa Goto

    SYNTHETIC METALS　194　47-51　2014/08

    DOI： 10.1016/j.synthmet.2014.04.015 　

    ISSN： 0379-6779

  50. Catalysis direction selective asymmetric polymerization in chiral liquid crystal medium Peer-reviewed

    Tomokazu Iseki, Kohsuke Kawabata, Hirotsugu Kawashima, Hiromasa Goto

    POLYMER　55　(1)　66-72　2014/01

    DOI： 10.1016/j.polymer.2013.12.009 　

    ISSN： 0032-3861

    eISSN： 1873-2291

  51. Synthesis of chiral inducers having double stereogenic centers for electrochemical polymerization in cholesteric liquid crystal medium Peer-reviewed

    Tomokazu Iseki, Kohsuke Kawabata, Shigeki Nimori, Hiromasa Goto

    SYNTHETIC METALS　187　217-223　2014/01

    DOI： 10.1016/j.synthmet.2013.11.017 　

    ISSN： 0379-6779

  52. Synthesis and properties of a low-bandgap liquid crystalline pi-conjugated polymer Peer-reviewed

    Hiromasa Goto, Aohan Wang, Kohsuke Kawabata, Fan Yang

    JOURNAL OF MATERIALS SCIENCE　48　(21)　7523-7532　2013/11

    DOI： 10.1007/s10853-013-7567-3 　

    ISSN： 0022-2461

  53. Synthesis and characterisation of thieno[3,2-b]thiophene-based linear shaped liquid crystals Peer-reviewed

    Jiuchao Dong, Kohsuke Kawabata, Takahiro Seino, Fan Yang, Hiromasa Goto

    LIQUID CRYSTALS　40　(11)　1455-1465　2013/11

    DOI： 10.1080/02678292.2013.835453 　

    ISSN： 0267-8292

    eISSN： 1366-5855

  54. Mechanical orientation in thermotropic liquid crystal state and magnetic orientation in solvent evaporation process via lyotropic liquid crystal state of an amphotropic low-bandgap liquid-crystalline -conjugated polymer Peer-reviewed

    Hiromasa Goto, Aohan Wang, Shigeki Nimori, Kohsuke Kawabata

    LIQUID CRYSTALS　40　(9)　1159-1166　2013/09

    DOI： 10.1080/02678292.2013.818168 　

    ISSN： 0267-8292

    eISSN： 1366-5855

  55. Synthesis of a pyrimidine-based new chiral inducer for construction of cholesteric liquid crystal electrolyte solution and its electrochemical polymerization, and stimulated emission like interference Peer-reviewed

    Aohan Wang, Kohsuke Kawabata, Hirotsugu Kawashima, Hiromasa Goto

    POLYMER　54　(15)　3821-3827　2013/07

    DOI： 10.1016/j.polymer.2013.04.053 　

    ISSN： 0032-3861

    eISSN： 1873-2291

  56. Horizontal and Vertical Orientation of Polythiophenes by Electrochemical Polymerization in Magnetically Aligned Smectic Liquid Crystal Peer-reviewed

    Kohsuke Kawabata, Shigeki Nimori, Hiromasa Goto

    ACS MACRO LETTERS　2　(7)　587-591　2013/07

    DOI： 10.1021/mz400213k 　

    ISSN： 2161-1653

  57. Synthesis of polymers from chiral monomers in chiral liquid crystals Peer-reviewed

    Satoshi Ohkawa, Fan Yang, Kohsuke Kawabata, Hiromasa Goto

    JOURNAL OF APPLIED POLYMER SCIENCE　128　(6)　3586-3591　2013/06

    DOI： 10.1002/app.38561 　

    ISSN： 0021-8995

  58. Synthesis of Isothianaphthene (ITN) and 3,4-Ethylenedioxy-Thiophene (EDOT)-Based Low-Bandgap Liquid Crystalline Conjugated Polymers Peer-reviewed

    Aohan Wang, Kohsuke Kawabata, Hiromasa Goto

    MATERIALS　6　(6)　2218-2228　2013/06

    DOI： 10.3390/ma6062218 　

    ISSN： 1996-1944

    eISSN： 1996-1944

  59. Optical activity of heteroaromatic conjugated polymer films prepared by asymmetric electrochemical polymerization in cholesteric liquid crystals: Structural function for chiral induction Peer-reviewed

    Kohsuke Kawabata, Masaki Takeguchi, Hiromasa Goto

    Macromolecules　46　(6)　2078-2091　2013/03/26

    DOI： 10.1021/ma400302j 　

    ISSN： 0024-9297

  60. Small carbon forms from polyaniline/metal Peer-reviewed

    Hiromasa Goto, Atsushi Yokoo, Masaki Takeguchi, Kohsuke Kawabata

    International Journal of Polymeric Materials and Polymeric Biomaterials　62　(8)　426-432　2013/03/22

    DOI： 10.1080/00914037.2012.721412 　

    ISSN： 0091-4037 1563-535X

  61. Preparation of Phenylenevinylene Derivatives Having Fluorescence and Chiral Induction Function Peer-reviewed

    Hiromasa Goto, Kohsuke Kawabata

    Journal of Dispersion Science and Technology　34　(3)　311-321　2013/03

    DOI： 10.1080/01932691.2012.666139 　

    ISSN： 0193-2691 1532-2351

  62. Helical twisting power of three-ring chiral molecules and polymerization in cholesteric electrolyte solutions Peer-reviewed

    Hitoshi Hayashi, Aohan Wang, Kohsuke Kawabata, Hiromasa Goto

    MATERIALS CHEMISTRY AND PHYSICS　137　(3)　816-824　2013/01

    DOI： 10.1016/j.matchemphys.2012.10.017 　

    ISSN： 0254-0584

  63. A possibility for generation of two species of charge carriers along main-chain and side-chains for a pi-conjugated polymer Peer-reviewed

    Yuki Kudo, Kohsuke Kawabata, Hiromasa Goto

    XXIST INTERNATIONAL SYMPOSIUM ON THE JAHN-TELLER EFFECT 2012　428　2013

    DOI： 10.1088/1742-6596/428/1/012006 　

    ISSN： 1742-6588

  64. Dynamically Controllable Emission of Polymer Nanofibers: Electrofluorescence Chromism and Polarized Emission of Polycarbazole Derivatives Peer-reviewed

    Kohsuke Kawabata, Hiromasa Goto

    CHEMISTRY-A EUROPEAN JOURNAL　18　(47)　15065-15072　2012/11

    DOI： 10.1002/chem.201201471 　

    ISSN： 0947-6539

  65. Synthesis and optical properties of 1,1-binaphthyl-thiophene alternating copolymers with main chain chirality Peer-reviewed

    Kohsuke Kawabata, Hiromasa Goto

    JOURNAL OF MATERIALS CHEMISTRY　22　(44)　23514-23524　2012/11

    DOI： 10.1039/c2jm35594a 　

    ISSN： 0959-9428

    eISSN： 1364-5501

  66. Synthesis and double doping behavior of a poly(p-phenylenevinylene)s bearing conjugated side chains Peer-reviewed

    Hirotsugu Kawashima, Kohsuke Kawabata, Hiromasa Goto

    JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY　50　(8)　1530-1538　2012/04

    DOI： 10.1002/pola.25919 　

    ISSN： 0887-624X

  67. Liquid Crystalline pi-Conjugated Copolymers Bearing a Pyrimidine Type Mesogenic Group. (vol 2, pg 22, 2009) Peer-reviewed

    Kohsuke Kawabata, Hiromasa Goto

    MATERIALS　5　(1)　156-156　2012/01

    DOI： 10.3390/ma5010156 　

    ISSN： 1996-1944

  68. Synthesis of a low-bandgap polymer bearing side groups containing phenoxy radicals Peer-reviewed

    Yu Innami, Rafael H. L. Kiebooms, Tamotsu Koyano, Masaaki Ichinohe, Satoshi Ohkawa, Kohsuke Kawabata, Masataka Kawamatsu, Kiyoto Matsuishi, Hiromasa Goto

    JOURNAL OF MATERIALS SCIENCE　46　(20)　6556-6562　2011/10

    DOI： 10.1007/s10853-011-5602-9 　

    ISSN： 0022-2461

  69. Light driven asymmetric polymerization: an approach for tele-control reaction Peer-reviewed

    Hiromasa Goto, Kohsuke Kawabata

    POLYMER CHEMISTRY　2　(5)　1098-1106　2011

    DOI： 10.1039/c0py00396d 　

    ISSN： 1759-9954

  70. Polymerization in Liquid Crystal Medium: Preparation of Polythiophene Derivatives Bearing a Bulky Pyrimidine Substituent Peer-reviewed

    Satoshi Ohkawa, Reina Ohta, Kohsuke Kawabata, Hiromasa Goto

    POLYMERS　2　(4)　393-406　2010/12

    DOI： 10.3390/polym2040393 　

    ISSN： 2073-4360

  71. Electrosynthesis of 2,7-linked polycarbazole derivatives to realize low-bandgap electroactive polymers Peer-reviewed

    Kohsuke Kawabata, Hiromasa Goto

    SYNTHETIC METALS　160　(21-22)　2290-2298　2010/11

    DOI： 10.1016/j.synthmet.2010.08.023 　

    ISSN： 0379-6779

  72. Electrochemical preparation of an electroactive polymer poly(dodecyloxy dibenzothiophene) (polyDDBTh) from hydroxyl dibenzothiophene (HDBTh) as a bioconverted monomer Peer-reviewed

    Hiromasa Goto, Yong-Soo Jeong, Kohsuke Kawabata, Masaki Takada, Takuya Kotanagi, Hideyuki Shigemori, Nobuhiko Nomura

    JOURNAL OF APPLIED ELECTROCHEMISTRY　40　(1)　191-195　2010/01

    DOI： 10.1007/s10800-009-9994-z 　

    ISSN： 0021-891X

  73. Uniaxially ordered conjugated polymer film prepared by electrochemical polymerization in a nematic liquid crystal with rubbing orientation method showing redox-driven tunable dichroism Peer-reviewed

    Kohsuke Kawabata, Hiroyuki Yoneyama, Hiromasa Goto

    POLYMER CHEMISTRY　1　(10)　1606-1608　2010

    DOI： 10.1039/c0py00279h 　

    ISSN： 1759-9954

  74. Periodic Structure in a Fluorene-based Polymer Prepared by Electrochemical Polymerization Peer-reviewed

    Kohsuke Kawabata, Hiromasa Goto

    CHEMISTRY LETTERS　38　(7)　706-707　2009/07

    DOI： 10.1246/cl.2009.706 　

    ISSN： 0366-7022

    eISSN： 1348-0715

  75. Liquid Crystalline pi-Conjugated Copolymers Bearing a Pyrimidine Type Mesogenic Group Peer-reviewed

    Kohsuke Kawabata, Hiromasa Goto

    MATERIALS　2　(1)　22-37　2009/03

    DOI： 10.3390/ma2010022 　

    ISSN： 1996-1944

  76. Preparation of Furan-Based Monomers and Asymmetric Electrochemical Polymerization in Cholesteric Liquid Crystals: Optical Activity and Selective Reflection Peer-reviewed

    Kohsuke Kawabata, Hiroyuki Yoneyama, Hiromasa Goto

    MOLECULAR CRYSTALS AND LIQUID CRYSTALS　515　3-15　2009

    DOI： 10.1080/15421400902987636 　

    ISSN： 1542-1406

  77. Visualization of nematic liquid crystal director by alignment of pi-conjugated polymer nanotubes Peer-reviewed

    Hiromasa Goto, Kohsuke Kawabata

    MACROMOLECULES　41　(13)　4551-4554　2008/07

    DOI： 10.1021/ma800455v 　

    ISSN： 0024-9297

  78. Preparation of iridescent-reflective poly(furan-co-phenylene)s by electrochemical polymerization in a cholesteric liquid crystal medium Peer-reviewed

    Hiroyuki Yoneyama, Kohsuke Kawabata, Akitsu Tsujimoto, Hiromasa Goto

    ELECTROCHEMISTRY COMMUNICATIONS　10　(7)　965-969　2008/07

    DOI： 10.1016/j.elecom.2008.04.021 　

    ISSN： 1388-2481

  79. Cholesteric liquid crystal inductive asymmetric polymerisation of thiophene monomers Peer-reviewed

    Hiromasa Goto, Fumihiro Togashi, Akitsu Tsujimoto, Reina Ohta, Kohsuke Kawabata

    LIQUID CRYSTALS　35　(7)　847-856　2008

    DOI： 10.1080/02678290802227276 　

    ISSN： 0267-8292

Show all ︎Show first 5

Industrial Property Rights 6

  1. ジピラニリデン化合物

    瀧宮和男, 川畑公輔, 松尾崇也, 新見一樹

    Property Type: Patent

  2. 芳香族化合物の製造方法

    瀧宮和男, 川畑公輔, 岩田智史, 前田健太郎, 貞光雄一

    Property Type: Patent

  3. 高分子化合物、該高分子化合物からなる有機半導体材料並びに該高分子化合物を有する有機半導体及び有機トランジスタ

    川畑公輔, 尾坂格, 瀧宮和男

    Property Type: Patent

  4. フェニルアルコキシ二置換アセチレンン系重合体

    後藤博正, 工藤友紀, 川畑公輔

    Property Type: Patent

  5. エレクトロ蛍光クロミズムを示す高分子ナノファイバー

    後藤博正, 川畑公輔

    Property Type: Patent

  6. ネマチック液晶電解液を用いた共役高分子膜の製造法と光学的異方性を有する共役高分子膜

    川畑公輔, 後藤博正

    Property Type: Patent

Show all Show first 5

Research Projects 4

  1. 三方晶系極性有機結晶の構築とバルク光起電流効果デバイスへの応用

    瀧宮 和男, 川畑 公輔, 中村 優男

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 挑戦的研究(開拓)

    Institution: 国立研究開発法人理化学研究所

    2025/06/27 - 2028/03/31

  2. ”結晶構造マニュピレーション”：ペリ縮合多環芳香族の高性能有機半導体化

    瀧宮 和男, 川畑 公輔

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 基盤研究(A)

    Institution: 国立研究開発法人理化学研究所

    2023/04/01 - 2026/03/31

  3. Development of near-infrared organic semiconductors

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Fund for the Promotion of Joint International Research (Fostering Joint International Research (B))

    Institution: Tohoku University

    2019/10/07 - 2023/03/31

  4. Development of acenedichalchogenophenedione-based organic semiconductors for near-infrared-active organic photodetectors

    Kawabata Kohsuke

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Early-Career Scientists

    Institution: Tohoku University

    2019/04/01 - 2021/03/31

    More details Close

    For the development of near-infrared (NIR) absorbing organic semiconductors for the application of NIR-active photodetectors, a series of new donor-acceptor-donor (D-A-D) organic semiconductors based on acenedichalcogenophenediones, which are fused-ring quinoidal structures, were synthesized and characterized. The D-A-D organic semiconductors synthesized in this study have an intense absorption band around 600-1000 nm in the solution state, whereas in the thin-film state, the absorption edges red-shift to 1000-1800 nm despite their neutral and closed shell electronic structures. Furthermore, organic field-effect transistor devices based the thin films exhibited air-stable ambipolar charge transport properties with hole and electron mobilities of up to 0.2 cm2/Vs. These results suggest that the acenedichalcogenophenediones are the promising building units for the development of NIR-absorbing organic semiconductors.