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Hot excitons increase the donor/acceptor charge transfer yield

Understanding the photoinduced ultrafast charge transfer (CT) dynamics across the donor/acceptor interface is a prerequisite for optimizing the performance of organic photovoltaic devices. Time-resolved second harmonic generation, an interface-sensitive probe with femtosecond temporal resolution, is...

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Hauptverfasser: Schulze, Michael (VerfasserIn) , Hänsel, Marc (VerfasserIn) , Tegeder, Petra (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 26 November 2014
In: The journal of physical chemistry. C, Energy, materials, and catalysis
Year: 2014, Jahrgang: 118, Heft: 49, Pages: 28527-28534
ISSN:1932-7455
DOI:10.1021/jp510701w
Online-Zugang:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1021/jp510701w
Volltext
Verfasserangaben:Michael Schulze, Marc Hänsel, Petra Tegeder

MARC

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520 |a Understanding the photoinduced ultrafast charge transfer (CT) dynamics across the donor/acceptor interface is a prerequisite for optimizing the performance of organic photovoltaic devices. Time-resolved second harmonic generation, an interface-sensitive probe with femtosecond temporal resolution, is applied to investigate the well-defined single heterojunction C60/P3HT. The de-excitation of hot singlet excitons in the conduction bands of the polymer into localized excitonic states is observed. In the presence of the electron acceptor, the ultrafast population of a CT state is identified as the dominating relaxation channel. Interestingly, the charge transfer yield correlates with the excitation wavelength and rises with increasing excess energy. 
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