Dynamics of the Lowest-Energy Excitons in Single-Walled Carbon Nanotubes under Resonant and Nonresonant Optical Excitation

Taishi Nishihara, Yasuhiro Yamada, Makoto Okano, Yoshihiko Kanemitsu

研究成果: Article査読

5 被引用数 (Scopus)

抄録

The dynamics of lowest-energy E11 excitons in undoped and hole-doped single-walled carbon nanotubes (SWCNTs) are investigated using transient absorption spectroscopy and theoretical calculations. In undoped SWCNT samples, E11 excitons under resonant E11 photoexcitation show faster decay than those under high-energy nonresonant photoexcitation. Doping SWCNTs with holes accelerates the E11 exciton decay through exciton-hole interactions; moreover, both resonant and nonresonant photoexcitation in hole-doped SWCNTs lead to nearly identical decay profiles. Theoretical calculations, which are based on a simple model that accounts for bright, dark, and charged exciton states, agree well with the experimental results. We ascribe the fast E11 exciton decay under the resonant E11 photoexcitation to the redistribution of exciton populations in the E11 bright exciton band, which includes optically accessible and inaccessible states; the rapid exciton redistribution is caused by exciton-hole scattering. Our study provides a clear understanding of the global features of exciton dynamics in SWCNTs.

本文言語English
ページ(範囲)28654-28659
ページ数6
ジャーナルJournal of Physical Chemistry C
119
51
DOI
出版ステータスPublished - 2015 12月 24
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • エネルギー(全般)
  • 物理化学および理論化学
  • 表面、皮膜および薄膜

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