Emergent Molecular Function Research Group

Our Team engages in the development and application of new functional organic molecules. Organic molecules can be designed and synthesized as they should have appropriate molecular and electronic structures for certain functionalities, and such functional molecules are utilized in fabricating optoelectronic devices such as organic field-effect transistors (OFETs) and organic solar cells (organic photovoltaics, OPVs). Recent our achievements are 1) development of high-performance molecular semiconductors applicable to OFETs with the highest mobilities, and 2) development of versatile semiconducting polymers that can be utilized to high performance solution-processed OTFTs and OPVs.

Research Fields

Engineering / Chemistry / Materials Sciences

Research Subjects

• Development of new organic semiconductors
• Control of electronic structure of organic semiconductors
• Application of organic semiconductors to electronic devices

Publications

1. Takimiya1, K., Nakano, M., Kang, M. J., Miyazaki, E., Osaka, I. :
   "Thienannulation: Efficient Synthesis of π-Extended Thienoacenes Applicable to Organic Semiconductors"
   Eur. J. Org. Chem. 217–227 (2013).
2. Osaka, I., Shinamura, S., Abe, T., Takimiya, K. :
   "Naphthodithiophenes as building units for small molecules to polymers; a case study for in-depth understanding of structure–property relationships in organic semiconductors"
   J. Mater. Chem. C 1, 1297-1304 (2013).
3. Nakano, M., Niimi, K., Miyazaki, E., Osaka, I., Takimiya1, K.:
   "Isomerically Pure Anthra[2,3-b:6,7-b′]-difuran (anti-ADF), -dithiophene (anti-ADT), and -diselenophene (anti-ADS): Selective Synthesis, Electronic Structures, and Application to Organic Field-Effect Transistors"
   J. Org. Chem. 77, 8099–8111 (2012).
4. * Osaka, I., Shimawaki, M., Mori, H., Doi, I., Miyazaki, E., Koganezawa, T., Takimiya, K.:
   "Synthesis, Characterization, and Transistor and Solar Cell Applications of A Naphthobisthiadiazole-Based Semiconducting Polymer "
   J. Am .Chem. Soc. 134, 3498-3507 (2012).
5. * Takimiya, K., Shinamura, S., Osaka, I., Miyazaki, E.:
   "Thienoacene-based Organic Semiconductors "
   Adv. Mater. 23, 4347-4370 (2011).
6. * Shinamura, S., Osaka, I., Miyazaki, E., Nakao, A., Yamagishi, M., Takeya, J., Takimiya K.:
   "Linear- and Angular-Shaped Naphthodithiophenes: Selective Synthesis, Properties, and Application to Organic Field-Effect Transistors "
   J. Am. Chem. Soc. 133, 5024-5035 (2011).
7. * Osaka, I., Abe, T., Shinamura, S., Miyazaki, E., Takimiya, K.:
   "High Mobility Semiconducting Naphthodithiophene Copolymers "
   J. Am. Chem. Soc. 132, 5000-5001 (2010).
8. * Izawa, T., Miyazaki, E., Takimiya, K.:
   "Molecular Ordering of High-Performance Soluble Molecular Semiconductors and Re-evaluation of Their Field-Effect Transistor Characteristics "
   Adv. Mater. 20, 3388-3393 (2008).
9. * Ebata, H., Izawa, T., Miyazaki, E., Takimiya, K., Ikeda, M., Kuwabara, H., Yui, T.:
   "Highly Soluble [1]Benzothieno[3,2-b]benzothiophene (BTBT) Derivatives for High-Performance, Solution-Processed Organic Field-Effect Transistors "
   J. Am. Chem. Soc. 129, 15732-15733 (2007).
10. * Takimiya, K., Yamamoto, Y.:
    "Facile Synthesis of Highly π-Extended Heteroarenes, Dinaphtho[2,3-b:2',3'-f]chalcogenopheno[3,2-b]chalcogenophenes, and Their Application to Field-Effect Transistors "
    J. Am. Chem. Soc. 129, 2224-2225 (2007).