Exciton size and mobility in (6,5) single-walled carbon nanotubes

Larry Lüer; Sajjad Hoseinkhani; Dario Polli; Jared Crochet; Tobias Hertel; Guglielmo Lanzani

doi:10.1117/12.783447

15 May 2008 Exciton size and mobility in (6,5) single-walled carbon nanotubes

Larry Lüer, Sajjad Hoseinkhani, Dario Polli, Jared Crochet, Tobias Hertel, Guglielmo Lanzani

Proceedings Volume 6999, Organic Optoelectronics and Photonics III; 699935 (2008) https://doi.org/10.1117/12.783447
Event: SPIE Photonics Europe, 2008, Strasbourg, France

Abstract

Using femtosecond pump probe spectroscopy with sub-20 fs resolution, we probe fundamental properties of the E11 exciton in (6,5) single walled carbon nanotubes, prepared by density gradient ultracentrifugation. From the initial photobleaching signal, measured faster than any relaxation process, we obtain the one-dimensional size of the excitonic wavefunction along the nanotube. Exciton decay is found pump-intensity dependent only at elevated pump intensities. Numerical modelling of decay kinetics yields an exciton diffusion coefficient of about 0.1 cm^2/s. Anisotropy measurements in highly purified samples show that there is virtually no depolarisation of the E11 bleach over 40 ps. A photoinduced absorption (PA) band, blueshifted against the E11 bleach, shows only weak anisotropy.

Citation Download Citation

Larry Lüer, Sajjad Hoseinkhani, Dario Polli, Jared Crochet, Tobias Hertel, and Guglielmo Lanzani "Exciton size and mobility in (6,5) single-walled carbon nanotubes", Proc. SPIE 6999, Organic Optoelectronics and Photonics III, 699935 (15 May 2008); https://doi.org/10.1117/12.783447

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