Exciton hopping in carbon nanotube solar cells studied with 2D white-light spectroscopy

Martin T. Zanni

doi:10.1117/12.2063327

9 September 2014 Exciton hopping in carbon nanotube solar cells studied with 2D white-light spectroscopy

Martin T. Zanni

Proceedings Volume 9165, Physical Chemistry of Interfaces and Nanomaterials XIII; 91650J (2014) https://doi.org/10.1117/12.2063327
Event: SPIE NanoScience + Engineering, 2014, San Diego, California, United States

Abstract

Semiconducting carbon nanotubes are an exciting new material for solar cells. Mesoscale films can now be assebled and made into devices in which the semiconducting tubes are the photoactive layer, analogous to organic dyes or quantum dots in dye-sensitized solar cells. In order to understand their exciton transport properties, we are studying the photophysics of these films. Obtaining a comprehensive picture of the pathways, rates, and bottlenecks is challenging because in many cases this relaxation spans a wide range of energies. The standard approach to study such a wide frequency range is to use a tunable pump pulse to excite each electronic transition in turn, one after another. We have developed two-dimensional white light spectroscopy (2D WL) which allows us to simultaneously examine a spectral range spanning roughly 500-1400 nm. The spectra resolve energy transfer between all possible combinations of excitonic states in the chirality-selected nanotubes, thereby providing an instantaneous and comprehensive snapshot of the dynamical pathways. The new physics we uncover has important implications in the development of carbon nanotube electronics and optoelectronics.

Citation Download Citation

Martin T. Zanni "Exciton hopping in carbon nanotube solar cells studied with 2D white-light spectroscopy", Proc. SPIE 9165, Physical Chemistry of Interfaces and Nanomaterials XIII, 91650J (9 September 2014); https://doi.org/10.1117/12.2063327

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