Organic semiconducting polymers are currently of broad interest as potential low-cost materials for photovoltaic and light-emitting display applications. We will give an overview of our work in developing a consistent quantum dynamical picture of the excited state dynamics underlying the photophysics. We will also focus upon the quantum relaxation and reorganization dynamics that occur upon photoexcitation of a couple of type II donor-acceptor polymer heterojunction systems. Our results stress the significance of vibrational relaxation in the state-to-state relaxation and the impact of curve crossing between charge-transfer and excitonic states. Furthermore, while a tightly bound charge-transfer state (exciplex) remain the lowest excited state, we show that the regeneration of the optically active lowest excitonic state in TFB:F8BT is possible via the existence of a steady-state involving the bulk charge-transfer state. Finally, we will discuss ramifications of these results to recent experimental studied and the fabrication of efficient polymer LED and photovoltaics.
CITATION STYLE
Bittner, E. R., & Ramon, J. G. S. (2007). Exciton and charge-transfer dynamics in polymer semiconductors. Springer Series in Chemical Physics. Springer New York. https://doi.org/10.1007/978-3-540-34460-5_3
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