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Emergent Functional Polymers Research Team
Keisuke TAJIMA
Team Leader
Keisuke TAJIMA (Ph.D.)
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Research Areas

We work on the development of new organic semiconducting polymer materials and their application to organic electronic devices. Specifically, we seek the methodology and the molecular design to control the precise structures in molecular- and nano-scale at our will, and try to find breakthroughs to drastically enhance the performance of the organic electronic devices. Targets of our research are not only the conventional organic solar cells and field-effect transistors, but also the organic electronic devices with new functions based on the structure controls.

Research Subject

  1. Development of new semiconducting polymers with low bandgaps
  2. Nanostructure control in thin films by self-organization of semiconducting polymers
  3. Search for the ideal molecular interfaces in organic solar cells

Related links

  1. RIKEN Advanced Science Institute Website_Laboratories PageNew Window

List of Selected Publications

  1. Zhou E.J., Cong, J.Z., Hashimoto K., Tajima K.:
    "Introduction of a Conjugated Side Chain as an Effective Approach to Improving Donor-Acceptor Photovoltaic Polymers"
    Energy Environ. Sci., 5, 9756-9759 (2012).
  2. Zhong Y.F., Ma J.S., Hashimoto K., Tajima K.:
    "Electric Field-Induced Dipole Switching at the Donor/Acceptor Interface in Organic Solar Cells"
    Adv. Mater. DOI: 10.1002/adma.201203605 (2012).
  3. Miyanishi S., Zhang Y., Hashimoto K., Tajima K.:
    "Controlled Synthesis of Fullerene-Attached Poly(3-alkylthiophene)-Based Copolymers for Rational Morphological Design in Polymer Photovoltaic Devices"
    Macromolecules, 45, 6424-6437 (2012).
  4. Zhou E.J.; Cong J.Z.; Zhao M.X.; Zhang L.Z.; Hashimoto K.; Tajima K.:
    "Synthesis and application of poly(fluorene-alt-naphthalene diimide) as an n-type polymer for all-polymer solar cells,"
    Chem. Commun., 48, 5283-5285 (2012).
  5. Izawa S., Hashimoto K., Tajima K.:
    "Morphological Stability of Organic Solar Cells Based upon Oligo(p-phenylenevinylene)-C70 Dyad,"
    Phys. Chem. Chem. Phys., 2012, 14, 16138-16142
  6. Tada A., Geng Y.F., Wei Q.S., Hashimoto K., Tajima K.:
    "Tailoring organic heterojunction interfaces in bilayer polymer photovoltaic devices"
    Nature Mater., 10, 450-455 (2011).
  7. Zhou E.J., Cong J.Z., Wei Q.S., Tajima K., Yang C.H., Hashimoto K.:
    "All-Polymer Solar Cells Based on Perylene Diimide-Based Copolymers: Material Design and Phase Separation Control"
    Angew. Chem. Int. Ed., 50, 2799-2803 (2011).
  8. Geng Y.F., Hashimoto K., Tajima K.:
    "Dipole Layer Formation by Surface Segregated Monolayer of Poly(3-alkylthiophene) with Alternating Semifluoroalkyl Side Chains"
    Chem. Mater., 23, 4257-4263 (2011)
  9. Wei, Q. S., Tajima, K., Tong, Y. J., Ye, S., Hashimoto, K.:
    "Surface-Segregated Monolayers: A New Type of Ordered Monolayer for Surface Modification of Organic Semiconductors"
    J. Am. Chem. Soc. 131, 17597-17604 (2009).
  10. Zhang, Y., Tajima, K., Hirota, K., Hashimoto, K.:
    "Synthesis of all-conjugated diblock copolymers by quasi-living polymerization and observation of their microphase separation"
    J. Am. Chem. Soc. 130, 7812-7813 (2008).

Members

Principal Investigator

Keisuke TAJIMA
Team Leader
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