Ultrafast electron transfer at organic semiconductor interfaces: Importance of molecular orientation

Alexander L. Ayzner, Dennis Nordlund, Do Hwan Kim, Zhenan Bao, Michael F. Toney

Research output: Contribution to journalArticle

39 Scopus citations


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.

Original languageEnglish
Pages (from-to)6-12
Number of pages7
JournalJournal of Physical Chemistry Letters
Issue number1
StatePublished - 2015 Jan 2

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