Dynamics of excitons and trions in semiconducting carbon nanotubes

Makoto Okano, Taishi Nishihara, Yasuhiro Yamada, Yoshihiko Kanemitsu

研究成果: Conference contribution

1 被引用数 (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.

ホスト出版物のタイトルUltrafast Phenomena and Nanophotonics XVII
出版ステータスPublished - 2013 5月 30
イベントUltrafast Phenomena and Nanophotonics XVII - San Francisco, CA, United States
継続期間: 2013 2月 32013 2月 6


名前Proceedings of SPIE - The International Society for Optical Engineering


OtherUltrafast Phenomena and Nanophotonics XVII
国/地域United States
CitySan Francisco, CA

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学
  • コンピュータ サイエンスの応用
  • 応用数学
  • 電子工学および電気工学


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