This talk will present results on the exciton migration in thin films of semiconducting carbon nanotubes such as used in recently developed photovoltaics.  To perform these experiments, we have invented a new variation of 2D spectroscopy that utilizes white-light as both the excitation and probe pulses. By doing so, we correlate the kinetics of exciton transfer across the entire wavelength range of interest, from 400 to 1500 nm, in a single 2D spectrum. We measure the kinetics of transfer in and amongst all of the E11 and E22 states simultaneously. Kinetics timescales are reported for all possible pathways.  In addition, other effects will be described, such as anticorrelated energy levels and coherent motions.  2D White-Light Spectroscopy is also applicable to other nanomaterials, such as quantum dots.

Charge and exciton migration in carbon nanotube thin films using 2D White-Light spectroscopy

247th National Meeting (2014)

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