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RIKEN Center for Emergent Matter Science Emergent Soft System Research Team

Team Leader: Takao Someya (Ph.D.)

Research Summary

Takao  Someya(Ph.D.)

Electronics is expected to support the foundation of highly develop ICT such as Internet of Things (IoT), artificial intelligence (AI), and robotics. In addition to improve the computing speed and storage capacity, it is required to minimize negative impact of machines on environment and simultaneously to realize the harmony between human and machines. We make full use of the novel soft electronic materials such as novel organic semiconductors in order to fabricate emergent thin-film devices and, subsequently, to realize emergent soft systems that exhibit super-high efficiency and harmonization with humans. The new soft systems have excellent features such as lightweight and large area, which are complimentary to inorganic semiconductors, are expected to open up new eco-friendly applications.

Main Research Fields

  • Engineering

Related Research Fields

  • Chemistry


  • Organic electronics
  • Flexible electronics

Selected Publications

  • 1. Sun, L., Wang, J., Matsui, H., Lee, S., Wang, W., Guo, S., Chen, H., Fang, K., Ito, Y., Inoue, D., Hashizume, D., Mori, K., Takakuwa, M., Lee, S., Zhou, Y., Yokota, T., Fukuda, K., and Someya, T.:
    "All-solution-processed ultraflexible wearable sensor enabled with universal trilayer structure for organic optoelectronic devices"
    Sci. Adv.10, eadk9460 (2024).
  • 2. Xiong, S., Fukuda. K., Nakano, K., Lee, S., Sumi, Y., Takakuwa, M., Inoue, D., Hashizume, D., Du, B., Yokota, T., Zhou, Y., Tajima, K., and Someya, T.:
    "Waterproof and ultraflexible organic photovoltaics with improved interface adhesion"
    Nat.Commun. 15, 681 (2024).
  • 3. Jiang, Z., Chen, N., Yi, Z., Zhong, J., Zhang, F., Ji, S., Liao R., Wang, Y., Li, H., Liu, Z., Wang, Y., Yokota, T., Liu, X., Fukuda, K., Chen, X., and Someya, T.:
    "A 1.3-micrometre-thick elastic conductor for seamless on-skin and implantable sensors"
    Nat. Electron., 5, 784-793 (2022).
  • 4. Kakei, Y., Katayama, S., Lee, S., Takakuwa, M., Furusawa, K., Umezu, S., Sato, H., Fukuda, K., and Someya, T.:
    "Integration of body-mounted ultrasoft organic solar cell on cyborg insects with intact mobility"
    npj Flex. Electron., 6, 78 (2022).
  • 5. Liu, R., Zhong, L. W., Fukuda, K., and Someya, T.:
    "Flexible self-charging power sources"
    Nat. Rev. Mater., 7, 870-886 (2022).
  • 6. Takakuwa, M., Fukuda, K., Yokota, T., Inoue, D., Hashizume, D., Umezu, S., and Someya, T.:
    "Direct gold bonding for flexible integrated electronics"
    Sci. Adv., 7, eabl6228 (2021).
  • 7. Fukuda, K., Yu, K., and Someya, T.:
    "The Future of Flexible Organic Solar Cells"
    Adv. Energy Mater., 10, 2000765 (2020).
  • 8. Lee, S., Sasaki, D., Kim, D., Mori, M., Yokota, T., Lee, H., Park, S., Fukuda, K., Sekino, M., Matsuura, K., Shimizu, T., and Someya, T.:
    "Ultrasoft electronics to monitor dynamically pulsing cardiomyocytes"
    Nat. Nanotechnol., 14, 156-160 (2019).
  • 9. Park, S., Heo, S., Lee, W., Inoue, D., Jiang, Z., Yu, K., Jinno, H., Hashizume, D., Sekino, M., Yokota, T., Fukuda, K., Tajima, K., and Someya, T.:
    "Self-powered ultra-flexible electronics via nano-grating-patterned organic photovoltaics"
    Nature, 561, 516-521 (2018).
  • 10. Xu, X., Fukuda, K., Karki, A., Park, S., Kimura, H., Jinno, H., Watanabe, N., Yamamoto, S., Shimomura, S., Kitazawa, D., Yokota, T., Umezu, S., Nguyen, T, and Someya, T.:
    "Thermally stable, highly efficient, ultraflexible organic photovoltaics"
    PNAS, 115, 4589-4594 (2018).

Recent Research Results

Related Links

Lab Members

Principal investigator

Takao Someya
Team Leader

Core members

Kenjiro Fukuda
Senior Research Scientist
Sunghoon Lee
Research Scientist
Sixing Xiong
Postdoctoral Researcher
Ruiqi Guo
Postdoctoral Researcher
Shin Young Lee
Senior Technical Staff
Shuxu Wang
Visiting Researcher
Masahito Takakuwa
Visiting Scientist
Younguk Cho
Visiting Scientist
Shumpei Katayama
Junior Research Associate

Contact Information

W405 Cooperation Center,
2-1 Hirosawa, Wako, Saitama
351-0198, Japan
Email: takao.someya [at] riken.jp