Dynamics of excitons and trions in semiconducting carbon nanotubes

Makoto Okano, Taishi Nishihara, Yasuhiro Yamada, Yoshihiko Kanemitsu

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)


We report the optical properties and exciton dynamics of undoped and hole-doped single-walled carbon nanotubes (SWCNTs). In the one-dimensional structures of SWCNTs, an electron and a hole form an exciton with a huge exciton binding energy. Stable excitons govern the optical responses of SWCNTs even at room temperature. With hole doping of SWCNTs, new peaks due to positive trions (positively charged excitons) appear below the E11 exciton peaks in the absorption and photoluminescence spectra. Trions are also stable at room temperature. Using femtosecond pump-probe transient absorption spectroscopy, we revealed that the exciton decay dynamics depends on the number of holes in SWCNTs. The exciton lifetime of hole-doped SWCNTs is much shorter than that of undoped SWCNTs. Fast decay components with lifetimes of a few picoseconds are attributed to trion formation and exciton-hole scattering in holedoped SWCNTs.

Original languageEnglish
Title of host publicationUltrafast Phenomena and Nanophotonics XVII
Publication statusPublished - 2013 May 30
Externally publishedYes
EventUltrafast Phenomena and Nanophotonics XVII - San Francisco, CA, United States
Duration: 2013 Feb 32013 Feb 6

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


OtherUltrafast Phenomena and Nanophotonics XVII
Country/TerritoryUnited States
CitySan Francisco, CA


  • Carbon nanotubes
  • Charged excitons
  • Excitons
  • Quantized Auger recombination
  • Transient absorption

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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