High-efficiency Asymmetric Squaraine Sensitizers for Dye- Sensitized Solar Cells

Stephen Barlow^a, Mostafa El-Sayed^a, Seth Marder^a, Timothy Parker^a, Paul Szymanski^a, Fadi Jradi^a, Daniel O'Neil^a, Iryna Davydenko^a, Xiongwu Kang^a, Rebecca Hill^a

^aGeorgia Institute of Technology, 901 Atlantic Dr. NW, Atlanta, 30332, United States

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)

Roma, Italy, 2015 May 11th - 13th

Organizer: Filippo De Angelis

Poster, Rebecca Hill, 315
Publication date: 5th February 2015

Dye-sensitized solar cells (DSCs) may play a role in future photovoltaic technologies. For optimal DSC performance, sensitizers that exhibit enhanced light-harvesting ability in the near-IR are needed in order to take advantage of the available solar spectrum, and squaraine dyes are promising candidates for increased near-IR absorption in DSCs. In order to investigate red-shifted absorption in squaraines and its effect on DSC performance, we have developed a series of asymmetrical bis(indolinylenemethyl)squaraine sensitizers that incorporate extended aromatic ring structures on a squaraine core similar to the previously studied squaraine sensitizer YR6. We have investigated the role of bulky and out-of-plane structures to prevent aggregation. We have replaced the π-bridge thiophene with cyclopentadithiophene or dithienosilole to increase high energy absorption. We report the synthesis, optical and electrochemical properties, and photovoltaic performance of these promising sensitizers, including the sensitizer RH4, which achieved a PCE of 9.6%. We discuss the broader implications for future organic DSC sensitizer design.

Hill et al., in preparation. Shi, Y.; Hill, R. B. M.; Yum, J.-H.; Dualeh, A.; Barlow, S.; Grätzel, M.; Marder, S. R.; Nazeeruddin, M. K. A High-Efficiency Panchromatic Squaraine Sensitizer for Dye-Sensitized Solar Cells. Angew Chem 2011, 123, 6749–6751.

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