RIKEN Center for Emergent Matter Science Emergent Molecular Function Research Team
Team Leader: Kazuo Takimiya (D.Eng.)
Research Summary

The Research 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.
Main Research Fields
- Chemistry
Related Research Fields
- Engineering
Keywords
- Organic Semiconductors
- Organic Field-Effect Transistors
- Organic Solar Cells
- Supramolecular Chemistry
Selected Publications
- 1.Nakano, M., Osaka, I., Takimiya, K.:
"Control of major carriers in ambipolar polymer semiconductor by self-assembled monolayers"
Adv. Mater., 29, 1602893 (2017). - 2.Wang, Y., Nakano, M., Michinobu, T., Kiyota, Y., Mori, T., Takimiya, K.:
"Naphthodithiophenediimide-Benzobisthiadiazole-Based Polymers: Versatile n-Type Materials for Field-Effect Transistors and Thermoelectric Devices"
Macromolecules, 50, 857-864 (2017). - 3.Zafra, J. L., Qiu, L., Yanai, N., Mori, T., Nakano, M., Alvarez, M. P., Lopez Navarrete, J. T., Gomez-Garcia, C. J., Kertesz, M., Takimiya, K., Casado, J.:
"Reversible Dimerization & Polymerization of a Janus Diradical Producing Labile CC Bonds and Giant Chromism"
Angew. Chem. Int. Ed., 55, 14563-14568 (2016). - 4.Kawabata, K., Saito, M., Osaka, I., Takimiya, K.:
"Very Small Bandgap π-Conjugated Polymers with Extended Thienoquinoids"
J. Am. Chem. Soc., 138, 7725-7732 (2016). - 5.Nakano, M., Sawamoto, M., Yuki, M., Takimiya, K.:
"N,N'-Unsubstituted Naphthodithiophene Diimide (NDTI): Synthesis and Derivatization via N-Alkylation and –Arylation"
Org. Lett., 18, 3770-3773 (2016). - 6.Vohra, V., Kawashima, K., Kakara, T., Koganezawa, T., Osaka, I., Takimiya, K., Murata, H.:
“Efficient inverted polymer solar cells employing favourable molecular orientation”
Nat. Photon. 9, 403–408 (2015). - 7.Nakano, M., Osaka, I., Hashizume, D., Takimiya, K.:
“α-Modified Naphthodithiophene Diimides-Molecular Design Strategy for Air-Stable n-Channel Organic Semiconductors”
Chem. Mater. 27, 6418–6425 (2015). - 8.Takimiya, K., Osaka, I., Mori, T., and Nakano, M.:
"Organic Semiconductors Based on [1]Benzothieno[3,2-b][1]benzothiophene Substructure"
Acc. Chem. Res., 47, 1493–1502 (2014). - 9.Osaka, I., Kakara, T., Takemura, N., Koganezawa, T., and Takimiya, K.:
"Naphthodithiophene–Naphthobisthiadiazole Copolymers for Solar Cells: Alkylation Drives the Polymer Backbone Flat and Promotes Efficiency"
J. Am. Chem. Soc., 135, 8834–8837 (2013). - 10.Fukutomi, Y., Nakano, M., Hu, J.-Y., Osaka, I. and Takimiya, K.:
"Naphthodithiophenediimide (NDTI): Synthesis, Structure, and Applications"
J. Am .Chem. Soc., 135, 11445–11448 (2013)
Recent Research Results
Mar. 24, 2017
Plugging leaks in printable logicSep. 30, 2016
Fluorine offers solar power boostOct. 11, 2013
Building better molecules for bendable electronicsJul. 26, 2013
Improvements in efficiency stack up
Related Links
Lab Members
Principal investigator
- Kazuo Takimiya
- Team Leader
Core members
- Chengyuan Wang
- Postdoctoral Researcher
- Takuya Ogaki
- Postdoctoral Researcher
- Maitisidike Rukeyamu
- Postdoctoral Researcher
- Masahiro Nakano
- Special Postdoctoral Researcher
- Naoya Suzuki
- Special Postdoctoral Researcher
- Johan Jean-Claude Maurice Hamonnet
- Technical Staff I
- Kohsuke Kawabata
- Visiting Scientist
- Nobuhiko Ohtsuka
- Junior Research Associate
Careers
Position | Deadline |
---|---|
Seeking a Postdoctoral Researcher or Research Scientist (W22267) | Open until filled |
Contact Information
504 Main Research Building,
2-1 Hirosawa,
Wako, Saitama
351-0198, Japan
Email: takimiya [at] riken.jp