Berlin 2014 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 17: Excitons and Excitation Transfer (SYET 2)

MO 17.5: Vortrag

Donnerstag, 20. März 2014, 15:15–15:30, BEBEL HS213

Temperature-dependent femtosecond time-resolved pump-probe study of exciton dynamics in (6,5) SWNTs — •Christoph Mann and Tobias Hertel — Julius-Maximilians-Universität Würzburg, Institut für Physikalische und Theoretische Chemie, Würzburg

Single wall carbon nanotubes (SWNTs) can be thought of as one-dimensional (1D) nanostructures consisting of rolled-up graphene sheets. Because of their unique electronic, mechanical and optical properties, an understanding of the exciton dominated excited-state dynamics in SWNTs is of great interest for both, better insight into fundamental photophysics of 1D systems in complex environments and for optoelectronic applications. We studied the temperature dependence of femtosecond transient absorption kinetics. In addition we carried out time-resolved and steady-state photoluminescence investigations between room temperature and 14 K. The combined information from these experiments provides new insights into the coupling of bright and dark excitonic states as well as on the temperature dependence of radiative and nonradiative processes.