1. Institute of Physical Chemistry, Theoretical Chemistry, Friedrich-Schiller University Jena, Helmholtzweg 4, D-07743 Jena, Germany
2. Department of Polytronic Systems, Workgroup Sensor Materials, Fraunhofer Research Institution for Modular Solid State Technologies (EMFT), Josef-Engert Strasse 9, D-93053 Regensburg, Germany
3. Institute of Physical Chemistry, Friedrich-Schiller University Jena, Lessingstrasse 10, D-07743 Jena, Germany