Disorder-Order Transitions in p-Conjugated Polymers

Köhler, Anna

Title:

Disorder-Order Transitions in p-Conjugated Polymers

dc.contributor.author	Köhler, Anna
dc.contributor.corporatename	Georgia Institute of Technology. Center for the Science and Technology of Advanced Materials and Interfaces	en_US
dc.contributor.corporatename	University of Bayreuth	en_US
dc.contributor.corporatename	Universität Bayreuth	en_US
dc.date.accessioned	2017-01-09T20:27:04Z
dc.date.available	2017-01-09T20:27:04Z
dc.date.issued	2016-12-02
dc.description	Presented on December 2, 2016 at 4:00 p.m. in the Engineered Biosystems Building (EBB), Room 1005, Georgia Tech.	en_US
dc.description	Professor 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.description	Runtime: 65:44 minutes	en_US
dc.description.abstract	The 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.extent	65:44 minutes
dc.identifier.uri	http://hdl.handle.net/1853/56149
dc.language.iso	en_US	en_US
dc.publisher	Georgia Institute of Technology	en_US
dc.relation.ispartofseries	STAMI-COPE Distinguished Lecture Series	en_US
dc.subject	Organic semiconductors	en_US
dc.title	Disorder-Order Transitions in p-Conjugated Polymers	en_US
dc.type	Moving Image
dc.type.genre	Lecture
dspace.entity.type	Publication
local.contributor.corporatename	Center for Organic Photonics and Electronics
local.contributor.corporatename	Center for the Science and Technology of Advanced Materials and Interfaces
local.relation.ispartofseries	COPE-STAMI Distinguished Lecture Series
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