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J Am Chem Soc. 2007 Jul 25;129(29):9144-9. Epub 2007 Jun 27.

Efficient solution-processed photovoltaic cells based on an anthradithiophene/fullerene blend.

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  • 1Department of Materials Science and Engineering, Cornell University, Ithaca, New York 14853, USA.


We report photovoltaic cells based on solution-processed blends using a novel anthradithiophene derivative as the donor and a fullerene derivative as the acceptor. Solvent vapor annealing of these blends leads to the formation of spherulites, which consist of a network of anthradithiophene crystallites dispersed in an amorphous matrix composed primarily of fullerene. We observe a direct correlation between coverage of a device with spherulites and its performance. Devices with 82% spherulite coverage reach a power conversion efficiency of 1%, which makes them one of the highest performing solution-processed small molecule photovoltaic cells to date.

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