Research Area

• Organic functional materials
• π-conjugated organic compounds

Research Subjects

• Organic semiconductors
• Organic field-effect transistors
• Organic photovoltaics

Overview of Research

Our research group focuses on development of new organic functional materials based on extended pi-conjugated compounds, which can be useful as organic semiconductors for field-effect transistors, photovoltaics, and thermoelectric devices. For realizing better organic semiconductors, it is important to design and synthesize molecules with suitable energy levels of frontier orbitals and to control the solid state structure of molecules (packing structure in the solid state). To these ends, we cover a wide range of experimental approaches including organic synthesis, theoretical calculations, physicochemical characterization, electrochemistry, thin-film fabrication, single-crystal/thin-film X-ray analysis, AFM, device fabrication/evaluation, and so on.

Selected Publications

• Crystal structures of dimethoxyanthracens: a clue to a rational design of packing structures of π-conjugated molecules, K. Takimiya, T. Ogaki, C. Wang, K. Kawabata, Chem. Asian J. 2020, 15, 915-919.
• “Disrupt and Induce” Intermolecular Interactions to Rationally Design Organic Semiconductor Crystals: from Herringbone to Rubrene-like Pitched π-Stack, C. Wang, D. Hashizume, M. Nakano, T. Ogaki, H. Takenaka, K. Kawabata, K. Takimiya, Chem. Sci. 2020, 11, 1573-1580.
• Synthesis of soluble dinaphtho[2,3-b:2',3'-f]thieno[3,2-b]thiophene (DNTT) derivatives: one-step functionalization of 2-bromo-DNTT, K. Kawabata, S. Usui, K. Takimiya, J. Org. Chem. 2020, 85, 195-206.
• Selenium-substituted β-methylthiobenzo[1,2-b:4,5-b´]dithiophenes: synthesis, property, packing structure, and transport properties, H. Takenaka, T. Ogaki, C. Wang, K. Kawabata, K. Takimiya, Chem. Mater. 2019, 31, 17, 6696-6705.
• Thiophene-fused Naphthalene Diimides: New Building Blocks for Electron Deficient π-Functional Materials, K. Takimiya, M. Nakano, Bull. Chem. Soc. Jpn. 2018, 91, 121-140.

Contact Information

“Please delete “/” after “@” in a mail address.”

Kazuo TAKIMIYA
(TEL +81-22-795-6585, Email: kazuo.takimiya.b6@/tohoku.ac.jp)
Kohsuke Kawabata
(TEL +81-22-795-6587, Email: kohsuka.kawabata.b2@/tohoku.ac.jp)