1. Center of Spectroelectrochemistry, Department of Electrochemistry and Conducting Polymers, IFW Dresden, Helmholtzstrasse 20, D-01069 Dresden, Germany, Faculty of Chemical and Food Technology, Department of Physical Chemistry, Slovak University of Technology, Radlinského 9, SK-812 37 Bratislava, Slovak Republic, and Institute of Applied Photophysics, University of Technology, George-Bähr-Strasse 1, D-01069 Dresden, Germany