SASOLAR13

Self-assembly strategies towards optimal morphology in small molecule organic solar cells

Coordinatore	UNIVERSITE DE STRASBOURG    more  Organization address address: rue Blaise Pascal 4 city: Strasbourg postcode: 67070 contact info Titolo: Mrs. Nome: Sandrine Cognome: Schott-Carrière Email: send email Telefono: 33368851124
Nazionalità Coordinatore	France [FR]
Totale costo	194˙046 €
EC contributo	194˙046 €
Programma	FP7-PEOPLE Specific programme "People" implementing the Seventh Framework Programme of the European Community for research, technological development and demonstration activities (2007 to 2013)
Code Call	FP7-PEOPLE-2013-IEF
Funding Scheme	MC-IEF
Anno di inizio	2014
Periodo (anno-mese-giorno)	2014-03-01   -   2016-02-29

 Partecipanti

#	participant	country	role	EC contrib. [€]
1	UNIVERSITE DE STRASBOURG  Organization address address: rue Blaise Pascal 4 city: Strasbourg postcode: 67070 contact info Titolo: Mrs. Nome: Sandrine Cognome: Schott-Carrière Email: send email Telefono: 33368851124	FR (Strasbourg)	coordinator	194˙046.60

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 Obiettivo del progetto (Objective)

'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.'