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Gernigon V.,University of Strasbourg | Leveque P.,University of Strasbourg | Brochon C.,CNRS Organic Polymer Chemistry Laboratory | Audinot J.-N.,Center De Recherche Public Gabriel Lippmann | And 5 more authors.
EPJ Applied Physics | Year: 2011

The nanostructure of the active layer in polymer/fullerene bulk heterojunction solar cells is known to have a strong impact on the device performances. Controlling the polymer/fullerene blend morphology is therefore particularly important. In this work, a rod-coil block copolymer, based on a regioregular poly(3-hexylthiophene) electron-donor rod block and a C 60-grafted coil block, is used as compatibilizer and its influences on the thin film morphology as well as the photovoltaic performances are investigated. It is shown that a small fraction of compatibilizer can enhance the device performances in an otherwise nonoptimized process. At higher fractions or long annealing times however, the fullerene-grafted copolymer is found to behave as a nucleation center and triggers the formation of fullerene crystals. © EDP Sciences 2011. Source

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