Objetivo Organic photovoltaics (OPVs) have gained a lot of attention as versatile and cheap alternatives to their inorganic counterparts. Great improvement has been made by tuning the electronic properties of donor, D, and acceptor, A, molecules. Equally important for high efficiency devices, is the morphology and orientation of D and A molecules in the active layer because: (1) excitons created upon absorption have a finite migration length (5-20 nm), D and A domains therefore have to be small and (2) both domains have to fully percolate the active layer in order to achieve efficient charge transport and collection at the electrodes. So far, the D-A morphology has mainly been optimized by altering processing methods, such as spin-casting, (organic) vapor phase deposition and vacuum thermal evaporation, and by post-deposition annealing (e.g. using solvent vapor and / or temperature).Here we propose to encode the morphology directly into the chemical structure of the D and A molecules by using self-assembly. This way, molecular recognition between the molecules determines the morphology of the active layer. To this end, pyrene derivatives with enhanced π-π stacking have been reported, as well as molecules incorporating hydrogen-bonding motifs coupled to electronically active segments. These types of self-assembled devices had enhanced efficiency compared to their non-assembled analogues, and clearly show that self-assembly provides a new level of control over morphology.In this project, we will use self-assembling D molecules bearing large π-π stacking motifs together with hydrogen bonding arrays to hierarchically organize both D and A molecules and creating a high interfacial area, while maintaining percolation. This way exciton diffusion and splitting will be facilitated, hole mobility will be enhanced by improved interconnection of D molecules and recombination will decrease, leading to higher power conversion efficiency. Ámbito científico engineering and technologyenvironmental engineeringenergy and fuelsrenewable energysolar energyphotovoltaic Programa(s) FP7-PEOPLE - Specific programme "People" implementing the Seventh Framework Programme of the European Community for research, technological development and demonstration activities (2007 to 2013) Tema(s) FP7-PEOPLE-2013-IEF - Marie-Curie Action: "Intra-European fellowships for career development" Convocatoria de propuestas FP7-PEOPLE-2013-IEF Consulte otros proyectos de esta convocatoria Régimen de financiación MC-IEF - Intra-European Fellowships (IEF) Coordinador UNIVERSITE DE STRASBOURG Aportación de la UE € 194 046,60 Dirección RUE BLAISE PASCAL 4 67081 Strasbourg Francia Ver en el mapa Región Grand Est Alsace Bas-Rhin Tipo de actividad Higher or Secondary Education Establishments Contacto administrativo Sandrine Schott-Carrière (Mrs.) Enlaces Contactar con la organización Opens in new window Sitio web Opens in new window Coste total Sin datos
