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Enhanced charge photogeneration promoted by crystallinity in small-molecule donor-acceptor bulk heterojunctions Public Deposited

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  • 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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  • Paudel, K., Johnson, B., Thieme, M., Haley, M. M., Payne, M. M., Anthony, J. E., & Ostroverkhova, O. (2014). Enhanced charge photogeneration promoted by crystallinity in small-molecule donor-acceptor bulk heterojunctions. Applied Physics Letters, 105(4), 043301. doi: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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