RIKEN Center for Emergent Matter Science Emergent Molecular Function Research Group
Group Director: Kazuo Takimiya (D.Eng.)
Research Summary
Our research activity is based upon organic synthesis that can afford new organic materials utilized in optoelectronic devices, such as organic field-effect transistors (OFETs), organic solar cells (organic photovoltaics, OPVs), and organic thermoelectric devices (OTE). To this end, our team develops new organic materials, which can be designed and synthesized in order to have appropriate molecular and electronic structures for target functionalities. Our recent achievements are 1) high-performance molecular semiconductors applicable to OFETs with high mobilities, 2) new non-fullerene acceptors and their OPVs showing high power conversion efficiencies, and 3) new molecular design strategies to control packing structures of organic semiconductors.
Main Research Fields
- Chemistry
Related Research Fields
- Engineering
Keywords
- Organic Semiconductors
- Pi-electronic compound
- Organic Synthesis
- Organic field-effect transistor
- Organic thermoelectric materials
Selected Publications
- 1.
K. Takimiya, K. Bulgarevich, K. Kawabata,
"Crystal-structure control of molecular semiconductors by methylthiolation: towards ultrahigh mobility",
Acc. Chem. Res., 34, 884 (2024). - 2.
T. Matsuo, K. Kawabata, K. Takimiya,
"A novel n-type molecular dopant with a closed-shell electronic structure applicable to the vacuum-deposition process",
Adv. Mater., 36, 2311047 (2024). - 3.
K. Bulgarevich, S. Horiuchi, K. Takimiya,
"Crystal-structure simulation of methylthiolated peri-condensed polycyclic aromatic hydrocarbons for identifying promising molecular semiconductors: discovery of 1,3,8,10-tetrakis(methylthio)peropyrene showing ultrahigh mobility",
Adv. Mater., 355, 2305548 (2023). - 4.
K. Bulgarevich, K. Takimiya,
"Crystal-structure simulation of molecular semiconductors: brickwork-related crystal structures of methylthiolated peri-condensed polycyclic aromatic hydrocarbons",
Mater. Horiz., 10, 5492-5499 (2023). - 5.
K. Kawabata, K. Takimiya,
"Quinoidal Acenedichalcogenophenediones for Near-infrared-absorbing Organic Semiconductors: Effects of Chalcogen Atom Substitution on The Physicochemical and Carrier Transport Properties",
Chem. Mater., 35, 7628–7642 (2023). - 6.
K. Sumitomo, Y. Sudo, K. Kanazawa, K. Kawabata, K. Takimiya,
"Enantiopure 2-(2-ethylhexyl)dinaphtho[2,3- b:2',3'-f]thieno[3,2-b]thiophenes: synthesis, single crystal structure and surprising lack of influence of stereoisomerism on thin-film structure and electronic properties",
Mater. Horiz., 9, 444-451 (2022). - 7.
K. Takimiya, Kirill Bulgarevich, M. Abbas, S. Horiuchi, T. Ogaki, K. Kawabata, A. Ablat,
"“Manipulation" of crystal structure by methylthiolation enabling ultrahigh mobility in a pyrene-based molecular semiconductor",
Adv. Mater., 33, 2102914 (2021). - 8.
Y. Wang, K. Takimiya, “Naphthodithiophenediimide–Bithiopheneimide Copolymers for High-Performance
n-Type Organic Thermoelectrics: Significant Impact of Backbone Orientation on Conductivity and Thermoelectric Performance",
Adv. Mater., 32, 2002060 (2020). - 9.
C. Wang, D. Hashizume, M. Nakano, T. Ogaki, H. Tekenaka, K. Kawabata, K. Takimiya,
""Disrupt and induce" intermolecular interactions to rationally design organic semiconductor crystals: from herringbone to rubrene- like pitched π-stacking",
Chem. Sci., 11, 1573-1580 (2020). - 10.
K. Kawabata, S. Usui, K. Takimiya,
"Synthesis of Soluble Dinaphtho[2,3-b:2',3' -f]thieno[3,2-b]thiophene (DNTT) Derivatives: One-Step Functionalization of 2-Bromo-DNTT",
J. Org. Chem., 85, 195-206 (2020).
Recent Research Results
-
Jul. 11, 2024
Robust molecule gives organic electronic devices a boost -
Mar. 24, 2017
Plugging leaks in printable logic -
Sep. 30, 2016
Fluorine offers solar power boost -
Oct. 11, 2013
Building better molecules for bendable electronics Jul. 26, 2013
Improvements in efficiency stack up
Related Links
Lab Members
Principal investigator
- Kazuo Takimiya
- Group Director
Core members
- Barun Dhara
- Research Scientist
- Haruki Sanematsu
- Postdoctoral Researcher
- Kirill Bulgarevich
- Postdoctoral Researcher
- Kohsuke Kawabata
- Visiting Scientist
Careers
Position | Deadline |
---|---|
Seeking a Postdoctoral Researcher (W24067) | Open until filled |
Contact Information
Main Research Building #510,
2-1 Hirosawa,
Wako, Saitama
351-0198, Japan
Email: takimiya [at] riken.jp