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Free-Carrier Generation in Aggregates of Single-Wall Carbon Nanotubes by Photoexcitation in the Ultraviolet Regime

Jared J. Crochet, Sajjad Hoseinkhani, Larry Lüer, Tobias Hertel, Stephen K. Doorn, and Guglielmo Lanzani
Phys. Rev. Lett. 107, 257402 – Published 16 December 2011
Physics logo See Focus story: Nanotube Bundles Show Promise for Solar Cells

Abstract

We present evidence for the generation of free carriers in aggregated single-wall carbon nanotubes by photoexcitation in the energetic range of the ππ* transition associated with the M saddle point of the graphene lattice. The underlying broad absorption culminating at 4.3 eV can be fit well with a Fano line shape that describes strong coupling of a saddle-point exciton to an underlying free electron-hole pair continuum. Moreover, it is demonstrated that transitions in this energetic region autoionize into the continuum by detecting features unique to the presence of free charges in the transient transmission spectra of the continuum-embedded second sub-band exciton, S2.

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  • Received 20 May 2011

DOI:https://doi.org/10.1103/PhysRevLett.107.257402

© 2011 American Physical Society

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Nanotube Bundles Show Promise for Solar Cells

Published 16 December 2011

Bundles of nearly identical carbon nanotubes have properties that are well-suited for making electricity from light.

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Authors & Affiliations

Jared J. Crochet1,*, Sajjad Hoseinkhani2,†, Larry Lüer3, Tobias Hertel4, Stephen K. Doorn1, and Guglielmo Lanzani5

  • 1Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
  • 2CNR/INFM-ULTRAS, Politecnico di Milano, Milan 20133, Italy
  • 3Madrid Institute of Advanced Studies, IMDEA Nanociencia, Madrid 28049, Spain
  • 4Institute for Physical and Theoretical Chemistry Department of Chemistry and Pharmacy, University of Würzburg, Würzburg 97074, Germany
  • 5Center for Nanoscience and Technology of IIT @ POLIMI and Physics Department of Politecnico di Milano, Milan 20133, Italy

  • *Present address: Physical Chemistry and Applied Spectroscopy, Los Alamos National Laboratory, NM 87545, USA. jcrochet@lanl.gov
  • Present address: Department of Material Science, University of Milano-Bicocca, Milan 20133, Italy.

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Issue

Vol. 107, Iss. 25 — 16 December 2011

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