1. Institute
of Inorganic Chemistry, Department of Chemistry and Applied Bioscience, ETH Zürich, CH-8093 Zürich, Switzerland
2. Laboratory
for
Thin Films and Photovoltaics, Empa − Swiss Federal Laboratories
for Materials Science and Technology, CH-8600 Dübendorf, Switzerland
3. Department
of Physics, Experimental Condensed Matter Physics Laboratory, University of Cyprus, 1678 Nicosia, Cyprus