RIKEN Center for Emergent Matter Science Emergent Functional Polymers Research Team

Team Leader: Keisuke Tajima (Ph.D.)

Japanese Page

Research Summary

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.

Main Research Fields

Chemistry

Related Research Fields

Engineering

Keywords

Organic solar cells
Semiconducting organic polymers
Thin films
Nanostructures
Interfacial science

Selected Publications

1. Wang, W.-C., Chen, S.-Y., Yang, Y.-W., Hsu, C. S., and Tajima, K.:
"Face-on Reorientation of π-Conjugated Polymers in Thin Films by Surface-Segregated Monolayers"
J. Mater. Chem. A 4, 2070013 (2020).
2. Nakano, K., Chen, Y., and Tajima, K.:
"Quantifying Charge Carrier Density in Organic Solar Cells by Differential Charging Techniques"
AIP Adv. 9, 125205 (2019).
3. Tajima, K.:
"Look Beyond the Surface: Recent Progress in Applications of Surface-segregated Monolayers for Organic Electronics"
Polym. J. 51, 1117 (2019).
4. Nakano, K., Chen, Y., Xiao, B., Han, W., Huang, J., Yoshida, H., Zhou, E. J., and Tajima, K.:
"Anatomy of the Energetic Driving Force for Charge Generation in Organic Solar Cells"
Nat. Comm. 10, 2520 (2019).
5. Wang, F., Nakano, K., Segawa, H., and Tajima, K.:
"Phytol-derived Alkyl Side-chains for ￢π-Conjugated Semiconducting Polymers"
Chem. Mater. 31, 2097 (2019).
6. Wang, F., Nakano, K., Yoshida, H., Hashimoto, K., Segawa, H., Hsu, C.-S., and Tajima, K.:
"Effects of End-On Oriented Polymer Chains at the Donor/Acceptor Interface in Organic Solar Cells"
J. Mater. Chem. A 6, 22880 (2018)
7. Wang, F., Hashimoto, K., Segawa, H., and Tajima, K.:
"Synthesis of Poly(3-butylthiophene) with Trisiloxane End Group and Its Surface Segregation Behavior inThin Films"
J. Photopolym. Sci. Tech. 31, 151 (2018)
8. Wang, C., Nakano, K., Lee, H. F., Chen, Y., Hong, Y.-L., Nishiyama, Y., and Tajima, K.:
"Intermolecular Arrangement of Fullerene Acceptors around Semiconducting Polymers in Mixed Bulk Heterojunctions"
Angew. Chem. Int. Ed 57, 7034 (2018)
9. Wang, F., Hashimoto, K., Segawa, H., and Tajima, K.:
"Effects of Chain Orientation in Self-Organized Buffer Layers Based on Poly(3-alkylthiophene)s for Organic Photovoltaics"
ACS Appl. Mater. Interfaces 10, 8901 (2018)
10. Ohnishi, I., Hashimoto, K., and Tajima K.:
"Synthesis of Diketopyrrolopyrrole-based Polymers with Polydimethylsiloxane Side Chains And Their Application in Organic Field-effect Transistors"
R. Soc. open sci. 5, 172025 (2018)