Organic Solar Cell; Organic Thin Film; H-Aggregates; Organic Single Crystal; PCBM; Cyanine Dye
Jean-Nicolas Tisserant, Roland Hany, Eric Wimmer, Antoni Sanchez-Ferrer, Jozef Adamcik, Gaetan Wicht, Frank Nüesch, Daniel Rentsch, Andreas Borgschulte, Raffaele Mezzenga, Jakob Heier (2014), Diyne-Functionalized Fullerene Self Assembly for Thin Film Solid-State Polymerization, in Macromolecules
, 47, 721-728.
Tisserant Jean-Nicolas, Brönnimann Rolf, Hany Roland, Jenatsch Sandra, Nüesch Frank A., Mezzenga Raffaele, Bona Gina-Luca, Heier Jakob (2014), Resonance Light Scattering in Dye-Aggregates Forming in Dewetting Droplets, in ACS Nano
, 8(10), 10057-10065.
This is a follow-up proposal to the SNF proposal Structured Templates of [6,6]-Phenyl C61-Butyric Acid Methyl Ester (PCBM) for Applications in Photovoltaics and Photonics, Ref. Nr 200021_132502, submitted to the SNF in October 2010. We here report the main achievements and main obstacles experienced towards the goal of the project. With this proposal we apply for 12 additional month of funding to guarantee a successful completion of the PhD thesis connected to the project.In proposal 200021_132502 we presented a strategy for controlling the supramolecular architecture in thin organic films that can find use in photovoltaics and photonics. We proposed to use liquid-liquid dewetting in a blend of fullerenes and cyanine dyes to form characteristic phase structures in the thin film. This mechanism has been pioneered by us and has the attribute that the characteristic length scale of the phase domains can be easily controlled. Most interestingly, the process of liquid-liquid dewetting leaves a nanostructured PCBM film that induces order (so called H-aggregation) in dye molecules. To make full use of the features, we proposed to synthesize a cross-linkable fullerene such that the obtained structures can be stabilized and be used as stable template films for further processing. Last but not least, we proposed to organize the PCBM domains of the template film into 2D photonic lattices by surface energy patterning. So far, we achieved the following:-Synthesis route for the fullerene derivate PCB-diyne which can be rendered insoluble upon heating.-PCB-diyne in thin films forms a mesoscopic structure similar to block-copolymer ordering. This highly organized surface was shown to organize dyes (and polythiophenes) into aggregates.-Generation of structured films of the PCB-diyne using the liquid liquid dewetting process. -We pinned down the mechanism how liquid-liquid dewetting responds to a surface energy pattern. -We demonstrated that dewetted dye droplets can grow into single crystalline domains. A super-ordinated dewetting structure induced molecular order in cyanine dye molecules, either in the form of aggregates or even larger, single crystalline domains. By manipulating the dewetted matrix film (patterned self-assembled monolayers), controlled growth of aggregates and crystals becomes possible.