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Controlling the Solidification of Organic Photovoltaic Blends with Nucleating Agents

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Nekuda Malik J. A., Treat N. D., Abdelsamie M., Yu L., Li R., Smilgies D.-M., Amassian A., Hawker C. J., Chabinyc M. L., Stingelin N.
Organic Photonics and Photovoltaics
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2014
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vol. 2
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issue 1
EN
Blending fullerenes with a donor polymer for the fabrication of organic solar cells often leads to at least partial vitrification of one, if not both, components. For prototypical poly(3-hexylthiophene):fullerene blend, we show that the addition of a commercial nucleating agent, di(3,4-dimethyl benzylidene)sorbitol, to such binary blends accelerates the crystallization of the donor, resulting in an increase in its degree of crystallinity in as-cast structures. This allows manipulation of the extent of intermixing/ phase separation of the donor and acceptor directly from solution, offering a tool to improve device characteristics such as power conversion efficiency.
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