Femtosecond charge transfer in assemblies of discotic liquid crystals
2008 (English)In: The Journal of Physical Chemistry C, ISSN 1932-7447, Vol. 112, no 40, 15784-15790 p.Article in journal (Refereed) Published
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.
National CategoryEngineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-49943DOI: 10.1021/jp8037494OAI: oai:DiVA.org:liu-49943DiVA: diva2:270839