1. Section for Solid State and Theoretical Inorganic Chemistry Institute of Inorganic Chemistry Eberhard Karls University Tübingen Auf der Morgenstelle 18 72076 Tübingen Germany
2. Center of Researches and Technologies of Energy (CRTEn) Laboratory of Nanomaterials and Systems for Renewable Energies B.P N° 95 2050- Hammam Lif Tunisia
3. University of Applied Sciences of Münster Laboratory for Applied Materials Science Stegerwaldstrasse 39 48565 Steinfurt Germany