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Incoherent Pathways of Charge Separation in Organic and Hybrid Solar Cells

Incoherent Pathways of Charge Separation in Organic and Hybrid Solar Cells

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GRUPP, Alexander, Philipp EHRENREICH, Julian KALB, Arne BUDWEG, Lukas SCHMIDT-MENDE, Daniele BRIDA, 2017. Incoherent Pathways of Charge Separation in Organic and Hybrid Solar Cells. In: The Journal of Physical Chemistry Letters. 8, pp. 4858-4864. eISSN 1948-7185. Available under: doi: 10.1021/acs.jpclett.7b01873

@article{Grupp2017-09-19Incoh-40200, title={Incoherent Pathways of Charge Separation in Organic and Hybrid Solar Cells}, year={2017}, doi={10.1021/acs.jpclett.7b01873}, volume={8}, journal={The Journal of Physical Chemistry Letters}, pages={4858--4864}, author={Grupp, Alexander and Ehrenreich, Philipp and Kalb, Julian and Budweg, Arne and Schmidt-Mende, Lukas and Brida, Daniele} }

Brida, Daniele Grupp, Alexander Kalb, Julian Incoherent Pathways of Charge Separation in Organic and Hybrid Solar Cells 2017-09-29T12:18:49Z Grupp, Alexander In this work, we investigate the exciton dissociation dynamics occurring at the donor:acceptor interface in organic and hybrid blends employed in the realization of photovoltaic cells. Fundamental differences in the charge separation process are studied with the organic semiconductor polymer poly(3-hexylthiophene) (P3HT) and either [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) or titanium dioxide (TiO<sub>2</sub>) acting as the acceptor. By using ultrafast broad-band transient absorption spectroscopy with few-fs temporal resolution, we observe that in both cases the incoherent formation of free charges dominates the charge generation process. From the optical response of the polymer and by tracking the excited-state absorption, we extract pivotal similarities in the incoherent energy pathways that follow the impulsive excitation. On time scales shorter than 200 fs, we observe that the two acceptors display similar dynamics in the exciton delocalization. Significant differences arise only on longer time scales with only an impact on the overall photocarrier generation efficiency. Brida, Daniele Schmidt-Mende, Lukas Kalb, Julian 2017-09-29T12:18:49Z Budweg, Arne 2017-09-19 Ehrenreich, Philipp Budweg, Arne eng Schmidt-Mende, Lukas Ehrenreich, Philipp

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