This talk will report results using 2D white light spectroscopy to study exciton dynamics in semiconducting carbon nanotube thin films like those used in recent photovoltaic devices. We have pioneered the development of 2D white light spectroscopy which uses a supercontinuum laser pulse to act as both the pump and probe. This allows us to span an extensive spectral range covering most of the solar spectrum, roughly 500-1500 nm, in a single spectrum. Thus, we are able to examine the kinetics from both the S1 and S2 states in the nanotubes simultaneously. We report kinetic time scales between all pairs of states, anticorrelated states, and possible quantum coherent effects. 2D WL is also applicable to a wide variety of other photovoltaic materials, such as quantum dots and pentacene. This talk will also present recent work implemeting 2D WL spectroscopy with pulse shaping.

2D white light spectroscopy: A comprehensive method for studying energy transfer in materials

248th National Meeting (2014)

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.