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Christian Müller, Toby A. M. Ferenczi, Mariano Campoy-Quiles, Jarvist M. Frost, Donal D. C. Bradley, Paul Smith, Natalie Stingelin-Stutzmann and Jenny Nelson Binary Organic Photovoltaic Blends: A Simple Rationale for Optimum Compositions Advanced Materials 20

Version of Record online: 12 AUG 2008 | DOI: 10.1002/adma.200800963

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Polymer/small molecule binaries, such as P3HT:PC61BM display eutectic phase behavior with optimum photovoltaic performance at slightly hypoeutectic compositions (with respect to polymer content). Such hypoeutectic blends readily solidify into a finely phase-separated matrix surrounding primary crystals of the small-molecular species. The resulting large interfacial area and component connectivity is a desirable microstructure for bulk-heterojunction solar cells.

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