Enhanced Fill Factor through Chalcogen Side-Chain Manipulation in Small-Molecule Photovoltaics

Thomas J. Aldrich, Matthew J. Leonardi, Alexander S. Dudnik, Nicholas D. Eastham, Boris Harutyunyan, Thomas J. Fauvell, Eric F. Manley, Nanjia Zhou, Melanie R. Butler, Tobias Harschneck, Mark A Ratner, Lin X. Chen, Michael J. Bedzyk, Robert P. H. Chang, Ferdinand S. Melkonyan, Antonio Facchetti, Tobin J Marks

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

The fill factor (FF) of organic photovoltaic (OPV) devices has proven difficult to optimize by synthetic modification of the active layer materials. In this contribution, a series of small-molecule donors (SMDs) incorporating chalcogen atoms of increasing atomic number (Z), namely oxygen, sulfur, and selenium, into the side chains are synthesized and the relationship between the chalcogen Z and the FF of OPV devices is characterized. Larger Z chalcogen atoms are found to consistently enhance FF in bulk-heterojunction OPVs containing PC61BM as the acceptor material. A significant ∼8% FF increase is obtained on moving from O to S to Se across three series of SMDs. The FF enhancement is found to result from the combination of more ordered morphology and decreased charge recombination in blend films for the high-Z-chalcogen SMDs. Because this FF enhancement is found within three series of SMDs, the overall strategy is promising for new SMD materials design.

Original languageEnglish
Pages (from-to)2415-2421
Number of pages7
JournalACS Energy Letters
Volume2
Issue number10
DOIs
Publication statusPublished - Oct 13 2017

ASJC Scopus subject areas

  • Chemistry (miscellaneous)
  • Energy Engineering and Power Technology
  • Fuel Technology
  • Renewable Energy, Sustainability and the Environment
  • Materials Chemistry

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    Aldrich, T. J., Leonardi, M. J., Dudnik, A. S., Eastham, N. D., Harutyunyan, B., Fauvell, T. J., Manley, E. F., Zhou, N., Butler, M. R., Harschneck, T., Ratner, M. A., Chen, L. X., Bedzyk, M. J., Chang, R. P. H., Melkonyan, F. S., Facchetti, A., & Marks, T. J. (2017). Enhanced Fill Factor through Chalcogen Side-Chain Manipulation in Small-Molecule Photovoltaics. ACS Energy Letters, 2(10), 2415-2421. https://doi.org/10.1021/acsenergylett.7b00743