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Probing ultrafast charge separation at organic donor/acceptor interfaces by a femtosecond electric field meter
13. R. W. Boyd, Nonlinear Optics, 3rd ed. (Elsevier Science, Burlington, 2008).
18. A. Huijser, B. M. J. M. Suijkerbuijk, R. J. M. Klein Gebbink, T. J. Savenije, and L. D. A. Siebbeles, J. Am. Chem. Soc. 130, 2485 (2008).
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Charge separation at organic donor/acceptor interfaces is a key step in the functioning of an organic photovoltaic cell, but experimental techniques that uniquely probe the interface on ultrafast time scales are absent. Here, we apply a technique sensitive to interfacial charge separation based on four-wave mixing to follow the transient electric field at the donor/acceptor interface. Examining the model system of copper phthalocyannine (CuPc) and fullerene (C60) bilayers, we observe ultrafast electron transfer from photoexcited CuPc to C60 on a 80 ± 20 fs time scale.
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