Incoherent Pathways of Charge Separation in Organic and Hybrid Solar Cells

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2017
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MesoPIN: Hocheffiziente gedruckte (>17%) Perowskit Solarzellen
BioMatS-07: Poröse Superkristalle durch biomimetische Strukturbildung aus polaren Nanopartikeln und deren Einsatz für effiziente Solarzellen (SuperSol)
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The Journal of Physical Chemistry Letters. 2017, 8, pp. 4858-4864. eISSN 1948-7185. Available under: doi: 10.1021/acs.jpclett.7b01873
Zusammenfassung

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 (TiO2) 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.

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530 Physik
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incoherent pathways, charge separation, organic and hybrid solar cells
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ISO 690GRUPP, 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. 2017, 8, pp. 4858-4864. eISSN 1948-7185. Available under: doi: 10.1021/acs.jpclett.7b01873
BibTex
@article{Grupp2017-09-19Incoh-40200,
  year={2017},
  doi={10.1021/acs.jpclett.7b01873},
  title={Incoherent Pathways of Charge Separation in Organic and Hybrid Solar Cells},
  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}
}
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