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

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28 Scopus Citations


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 languageAmerican English
Article number115444
Number of pages8
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number11
StatePublished - 15 Mar 2005

NREL Publication Number

  • NREL/JA-590-37649


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