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Femtosecond charge transfer in assemblies of discotic liquid crystals
Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Surface Physics and Chemistry .
Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Surface Physics and Chemistry .
Department of Synchrotron Radiation Research, Lund University, Box 118, 221 00 Lund, Sweden.
Laboratory of Polymer Chemistry, Université Libre de Bruxelles, Boulevard du Triomphe, 1050 Bruxelles, Belgium.
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2008 (English)In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 112, no 40, 15784-15790 p.Article in journal (Refereed) Published
Abstract [en]

The electronic coupling strength within columns of discotic liquid crystals is investigated using core-level resonant photoemission spectroscopy. Coexisting well-ordered and disordered regions are identified in thin films of tetra-alkoxy-substituted phthalocyanines with the aid of near edge X-ray absorption fine structure and photoelectron spectroscopies. These different regions are used to derive a lower limit for the intermolecular charge transfer bandwidth within the framework of the core-hole clock principle. We find average charge transfer times on the order of a few femtoseconds, that is, significantly faster than the C(ls) core-hole lifetime, which indicates a surprisingly strong electronic coupling between the phthalocyanine units as compared to what is expected from the charge transport characteristics of this material. © 2008 American Chemical Society.

Place, publisher, year, edition, pages
2008. Vol. 112, no 40, 15784-15790 p.
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Engineering and Technology
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URN: urn:nbn:se:liu:diva-49943DOI: 10.1021/jp8037494OAI: oai:DiVA.org:liu-49943DiVA: diva2:270839
Available from: 2009-10-11 Created: 2009-10-11 Last updated: 2017-12-12

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de Jong, Michel POsikowicz, WojciechSalaneck, William R

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