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C8.05 - Photo-Induced Charge Carrier Generation in Covalent Organic Frameworks 
April 23, 2014   11:45am - 12:00pm

While impressive advances have been achieved with organic bulk heterojunction solar cells, a deterministic control of their nanoscale morphology has been elusive so far. It would be a major breakthrough to be able to create interpenetrating networks of electron donor and acceptor phases with appropriate dimensions for maximum collection yields.We report a significant step towards this goal on the basis of crystalline covalent organic frameworks (COFs). Rational design of their molecular building blocks enables the formation of highly porous frameworks with defined pore size and tailored optoelectronic properties. We have investigated semiconducting thiophene-based COFs and succeeded in incorporating electron acceptor molecules into their porous channels. Spectroscopic results demonstrate light-induced charge transfer from the COF donor network to the pore-located acceptor phase. We moreover succeeded in the preparation of high-quality oriented COF thin films and were able to create the first working photovoltaic devices through infiltration of the COF network with fullerene derivatives.[1]Here we will present new results on COF-based photovoltaic devices, spectroscopic investigations of the light induced charge transfer, and strategies to extend the light harvesting capabilities.[1] M. Dogru, M. Handloser, F. Auras, T. Kunz, D. Medina, A. Hartschuh, P. Knochel, T. Bein, Angew. Chem. Int. Ed. 2013, 52, 2920-2924.

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Keynote Address
Panel Discussion - Different Approaches to Commercializing Materials Research
Business Challenges to Starting a Materials-Based Company
Fred Kavli Distinguished Lectureship in Nanoscience
Application of In-situ X-ray Absorption, Emission and Powder Diffraction Studies in Nanomaterials Research - From the Design of an In-situ Experiment to Data Analysis