We examined sub-nanosecond time-scale charge carrier dynamics in crystalline films of a functionalized anthradithiophene (ADT) donor (D) with three different acceptor (A) molecules. A four-fold enhancement in ultrafast charge carrier separation efficiency was observed in D/A blends with a fullerene acceptor added at 7–10 wt. % concentrations, whereas a gradual decrease in peak photocurrent amplitude with acceptor concentration was observed with functionalized pentacene and indenofluorene acceptors. The results were directly correlated with the ADT-tri(ethylsilyl)ethynyl-F donor crystallinity. In the best-performing blends, the presence of crystalline acceptor domains was also established.

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Published in Applied Physics Letters, v. 105, no. 4, article 043301, p. 1-4.

Copyright 2014 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.

The following article appeared in Applied Physics Letters, v. 105, no. 4, article 043301, p. 1-4 and may be found at http://dx.doi.org/10.1063/1.4891758.

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This work was supported by the NSF Grants DMR-1207309 (O.O.) and CHE-1301485 (M.H.), and the OSU URISC Program (M.T.).

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