1. University of Goettingen, Institute of Inorganic
Chemistry, Tammannstraße
4, D-37077 Göttingen, Germany
2. University of Goettingen, Institute of Materials
Physics, Friedrich-Hund-Platz
1, D-37077 Göttingen, Germany
3. University of Goettingen, International Center
for Advanced Studies of Energy Conversion (ICASEC), D-37077 Göttingen, Germany