Ultrafast photoresponse of metallic and semiconducting single-wall carbon nanotubes

Randy J. Ellingson, Chaiwat Engtrakul, Marcus Jones, Monica Samec, Garry Rumbles, Arthur J. Nozik, Michael J. Heben

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)


Utilizing a transient absorption (TA) technique based on a chirp-corrected broadband probe, we have studied the ultrafast photoresponse of dispersed HiPco single-wall carbon nanotubes (SWNTs) over the range of 440-1050 nm for excitation in the range of 430-1700 nm. While both metallic and semiconducting SWNTs show transient bleaching at their M 11 and S 11 energies for excitation above these energies, metallic SWNTs uniquely exhibit a photoresponse to sub-M 11 excitation. We observe a TA spectral response for metallic SWNTs which is consistent with thermal broadening of the M 11 transition bands. In contrast to metallic SWNTs, specific semiconducting SWNTs exhibit transparency for sub-S 11 excitation, in accord with the expected zero density of states below the first interband transition. We report the observation of a long-lived (τ>1 ns) transient bleach component for three semiconducting SWNT species.

Original languageEnglish
Article number115444
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number11
Publication statusPublished - Mar 15 2005

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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