21 February 2011 Ultrafast exciton and charge transfer in small aggregates of carbon nanotubes
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We study excitation energy and charge transfer in small aggregates of chirality enriched carbon nanotubes by transient absorption spectroscopy. Ground state photobleaching is used to monitor exciton population dynamics with sub-10 fs time resolution. Upon resonant excitation of the first exciton transition in (6,5) tubes, we find evidence for energy transfer to (7,5) tubes within our time resolution (< 10 fs). After pumping at high pump energies, free charge carriers are produced via exciton scattering into the underlying continuum bands. We obtain clearly distinguished photoinduced features in the visible spectral range, that allow for real-time tracing of charge carrier dynamics in carbon nanotubes on a sub-picosecond time scale.
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L. Lüer, J. Crochet, S. Hoseinkhani, T. Hertel, G. Cerullo, G. Lanzani, "Ultrafast exciton and charge transfer in small aggregates of carbon nanotubes", Proc. SPIE 7937, Ultrafast Phenomena in Semiconductors and Nanostructure Materials XV, 79371U (21 February 2011); doi: 10.1117/12.877199; https://doi.org/10.1117/12.877199

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