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Design of organic ternary blends and small-molecule bulk heterojunctions: photophysical considerations

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Rajesh, Kallarakkal Ramakrishnan, Paudel, Keshab, Johnson, Brian, Hallani, Rawad, Anthony, John, and Ostroverkhova, Oksana

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We explored relationships between photophysical processes and solar cell characteristics in solution-processable bulk heterojunctions (BHJs), in particular: (1) polymer donor:fullerene acceptor:small-molecule (SM) nonfullerene acceptor, (2) polymer donor:SM donor:SM nonfullerene acceptor, and (3) SM donor:SM nonfullerene or fullerene acceptor. Addition of a nonfullerene SM acceptor to “efficient” polymer:fullerene BHJs led to...

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,a Keshab Paudel,a Brian Johnson,a Rawad Hallani,b John Anthony,b and Oksana Ostroverkhovaa
Enhanced charge photogeneration promoted by crystallinity in small-molecule donor-acceptor bulk heterojunctions

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Paudel, Keshab, Johnson, Brian, Thieme, Mattson, Haley, Michael M., Payne, Marcia M., Anthony, John E., and Ostroverkhova, Oksana

Abstract:

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...

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photogeneration promoted by crystallinity in small-molecule donor-acceptor bulk heterojunctions Keshab Paudel,1

ScholarsArchive@OSU

Design of organic ternary blends and small-molecule bulk heterojunctions: photophysical considerations

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

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