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Nonradiative exciton decay dynamics in hole-doped single-walled carbon nanotubes

Source: Phys. Rev. B 81, 033409 (2010); doi:10.1103/PhysRevB.81.033409

Published 27 January 2010

PACS
  • 78.67.Ch
    Optical properties of nanotubes
  • 71.35.-y
    Excitons and related phenomena
  • 78.47.J-
    Ultrafast pump/probe spectroscopy (<1 ps) in condensed matter
  • YEAR: 2010
PUBLICATION DATA
ISSN:
1553-9601 (online)
Publisher:
AIP is a member of CrossRef APS
Kazunari Matsuda,1 Yuhei Miyauchi,1,3 Takero Sakashita,1 and Yoshihiko Kanemitsu1,2
1Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
2Photonics and Electronics Science and Engineering Center, Kyoto University, Kyoto 615-8510, Japan
3Center for Integrated Science and Engineering, Columbia University, New York, New York 10027, USA
We studied exciton dynamics in hole-doped single-walled carbon nanotubes (SWNTs). The intensities of photoluminescence (PL) peaks decreased and the PL lifetimes became shorter with an addition of hole dopant tetrafluorotetracyano-p-quinodimethane (F4TCNQ). We found that the nonradiative decay of excitons induced by the F4TCNQ was of the order of a few tens of picoseconds for densities of ~0.1  hole/nm at room temperature. Our results suggest that the nonradiative exciton relaxation in the hole-doped SWNTs can be explained by phonon-assisted indirect ionization processes. ©2010 The American Physical Society
History: Received 13 October 2009; revised 27 November 2009; published 27 January 2010
Permalink: http://link.aps.org/abstract/PRB/v81/e033409
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