Ultrafast Electron Transfer at Organic Semiconductor Interfaces: Importance of Molecular Orientation
KAUST Grant NumberKUS-C1-015-21
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Abstract© 2014 American Chemical Society. Much is known about the rate of photoexcited charge generation in at organic donor/acceptor (D/A) heterojunctions overaged over all relative arrangements. However, there has been very little experimental work investigating how the photoexcited electron transfer (ET) rate depends on the precise relative molecular orientation between D and A in thin solid films. This is the question that we address in this work. We find that the ET rate depends strongly on the relative molecular arrangement: The interface where the model donor compound copper phthalocyanine is oriented face-on with respect to the fullerene C60 acceptor yields a rate that is approximately 4 times faster than that of the edge-on oriented interface. Our results suggest that the D/A electronic coupling is significantly enhanced in the face-on case, which agrees well with theoretical predictions, underscoring the importance of controlling the relative interfacial molecular orientation.
CitationAyzner AL, Nordlund D, Kim D-H, Bao Z, Toney MF (2015) Ultrafast Electron Transfer at Organic Semiconductor Interfaces: Importance of Molecular Orientation. The Journal of Physical Chemistry Letters 6: 6–12. Available: http://dx.doi.org/10.1021/jz502253r.
SponsorsThis work was partially supported by the Center for Advanced
PublisherAmerican Chemical Society (ACS)
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