Abstract
Charge generation in an organic photovoltaic blend was investigated using transient absorption spectroscopy. In films of pure electron donating material, subpicosecond spectral oscillations were observed and assigned to torsional modes associated with excited state relaxation and localization. These modes are systematically suppressed in the presence of fullerene, indicating that a significant fraction of charge transfer occurs prior to excited state localization.
- Received 23 November 2014
- Revised 14 January 2015
DOI:https://doi.org/10.1103/PhysRevB.91.075436
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