%0 Journal Article %1 doi:10.1021/acs.jpclett.7b01873 %A Grupp, Alexander %A Ehrenreich, Philipp %A Kalb, Julian %A Budweg, Arne %A Schmidt-Mende, Lukas %A Brida, Daniele %D 2017 %J The Journal of Physical Chemistry Letters %K chargeTransferState coherence hybridInterface organics %N ja %P null %R 10.1021/acs.jpclett.7b01873 %T Incoherent Pathways of Charge Separation in Organic & Hybrid Solar Cells %U http://dx.doi.org/10.1021/acs.jpclett.7b01873 %V 0 %X 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 acceptor. By using ultrafast broadband transient absorption spectroscopy with few-fs temporal resolution, we observe that in both cases the incoherent formation of free charges is dominating 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 timescales shorter than 200 fs we observe that the two acceptors display similar dynamics in the exciton delocalization. Significant differences arise only on longer timescales with only an impact on the overall photocarrier generation efficiency.

@article{doi:10.1021/acs.jpclett.7b01873, abstract = { 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 acceptor. By using ultrafast broadband transient absorption spectroscopy with few-fs temporal resolution, we observe that in both cases the incoherent formation of free charges is dominating 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 timescales shorter than 200 fs we observe that the two acceptors display similar dynamics in the exciton delocalization. Significant differences arise only on longer timescales with only an impact on the overall photocarrier generation efficiency. }, added-at = {2017-09-25T10:13:09.000+0200}, author = {Grupp, Alexander and Ehrenreich, Philipp and Kalb, Julian and Budweg, Arne and Schmidt-Mende, Lukas and Brida, Daniele}, biburl = {https://www.bibsonomy.org/bibtex/2183068ec234d5c5a8269b0f57edb480f/cgoehler}, description = {Incoherent Pathways of Charge Separation in Organic & Hybrid Solar Cells - acs.jpclett.7b01873}, doi = {10.1021/acs.jpclett.7b01873}, eprint = {http://dx.doi.org/10.1021/acs.jpclett.7b01873}, interhash = {de27dab01360e2e9bf1492b174bbae91}, intrahash = {183068ec234d5c5a8269b0f57edb480f}, journal = {The Journal of Physical Chemistry Letters}, keywords = {chargeTransferState coherence hybridInterface organics}, note = {PMID: 28925705}, number = {ja}, pages = {null}, timestamp = {2017-09-25T10:13:09.000+0200}, title = {Incoherent Pathways of Charge Separation in Organic \& Hybrid Solar Cells}, url = {http://dx.doi.org/10.1021/acs.jpclett.7b01873}, volume = 0, year = 2017 }