Wednesday, November 19, 2008, 10:00 am — CFN - Bldg. 735 - 1st Floor Conf. Rm. B
Optoelectronic devices depend on the interplay of charged and neutral photoexcitations. We deploy femtosecond spectroscopy to resolve the underlying elementary charge and energy transfer processes, in order to understand how they are influenced by morphology. A short introduction will outline the measurement principle and evaluate the merits of femtosecond spectroscopy against other methods. In organic small molecule and polymer films, we characterized femtosecond charge generation yields, early charge carrier mobilities and geminate charge recombination in operating devices; these parameters are crucial for photovoltaic performance. In highly defined carbon nanotube samples, we obtained the size and the mobility of excitons by a direct measurement. Finally, we show recent results on directional energy transfer in bacterial light harvesting complex; understanding the morphology influence on the transfer yields can be used to build highly efficient artificial systems for light harvesting and switching.
Hosted by: Chuck Black
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