[MOS] Reminder: MOS Seminar tomorrow with Prof. Martin T. Zanni

[Christine Brooks]

Hi all,

Tomorrow’s MOS seminar will be presented by Prof. Martin T. Zanni (University of Wisconsin-Madison) at 12pm in the Grier Room (34-401)

Exciton transfer in photovoltaics made from semiconducting carbon nanotubes studied using ultrafast 2D White-Light Spectroscopy

It has recently become possible to purify carbon nanotubes into semiconducting thin films, making their use possible in energy harvesting and optoelectronic devices. Individual carbon nanotubes are well known to have exceptional transport and optical properties, but the properties in bulk materials are unknown. They are essentially a new mesoscale material. In this talk, I will report a method that we have developed, called two-dimensional white light spectroscopy (2D WL), which uses a broadband continuum as both the pump and probe source, enabling us to simultaneously examine a spectral range spanning from 500-1400 nm. The 2D WL 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. We observe exciton hopping, exciton dissociation, and anti-correlated energy levels; all of which have important implications in the development of carbon nanotube electronics and optoelectronics.

Lunch will be served following the seminar at 1pm.

Christine Brooks
Administrative Assistant
Massachusetts Institute of Technology
Department of Chemistry
77 Massachusetts Ave, 6-333
Cambridge, MA 02139
p: 617.253.7239
e: cbrooks at mit.edu

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