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dc.contributor.authorKöhler, Anna
dc.date.accessioned2017-01-09T20:27:04Z
dc.date.available2017-01-09T20:27:04Z
dc.date.issued2016-12-02
dc.identifier.urihttp://hdl.handle.net/1853/56149
dc.descriptionPresented on December 2, 2016 at 4:00 p.m. in the Engineered Biosystems Building (EBB), Room 1005, Georgia Tech.en_US
dc.descriptionProfessor Anna Köhler holds the Chair of Experimental Physics II at the University of Bayreuth. Her research is concerned with photophysical processes in organic semiconductors. Professor Köhler's research group focuses in particular on the processes of energy and charge transfer in singlet and triplet excited states, the exciton dissociation mechanism and intermolecular/interchain interactions. She has published more than 100 papers, several book chapter and one textbook. Professor Köhler received her PhD in 1996 from the University of Cambridge, UK, where she continued her research funded through Research Fellowships by Peterhouse and by the Royal Society. In 2003 she was appointed Professor at the University of Potsdam, Germany, from where she moved to the Department of Physics at the University of Bayreuth, Germany, in 2007.en_US
dc.descriptionRuntime: 65:44 minutesen_US
dc.description.abstractThe aggregation of p-conjugated materials significantly impacts on the photophysics, and thus on the performance of optoelectronic devices. Nevertheless, we know comparatively little about the laws governing aggregate formation of p-conjugated materials from solution. In this talk, I shall compare, discuss and summarize how aggregates form for three different types of compounds, that is, homopolymers, donor-acceptor type polymers and low molecular weight compounds. To understand how aggregates form, we employ temperature dependent optical spectroscopy, which is a simple yet powerful tool for such investigations. I shall discuss how optical spectra can be analysed to identify distinct conformational states and to obtain quantitative information on changes in the inter-chain coupling, the conjugation length and the oscillator strength upon aggregate formation. We find aggregate formation to proceed alike in all these compounds by a coil-to-globule like first order phase transition. Notably, the chain expands before it collapses into a highly ordered dense state. I will address the role of side chains and the impact of changes in environmental polarization.en_US
dc.format.extent65:44 minutes
dc.language.isoen_USen_US
dc.publisherGeorgia Institute of Technologyen_US
dc.relation.ispartofseriesSTAMI-COPE Distinguished Lecture Seriesen_US
dc.subjectOrganic semiconductorsen_US
dc.titleDisorder-Order Transitions in p-Conjugated Polymersen_US
dc.typeLectureen_US
dc.typeVideoen_US
dc.contributor.corporatenameGeorgia Institute of Technology. Center for the Science and Technology of Advanced Materials and Interfacesen_US
dc.contributor.corporatenameUniversity of Bayreuthen_US
dc.contributor.corporatenameUniversität Bayreuthen_US


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