1. Department of Physics, Experimental Condensed Matter Physics Laboratory, University of Cyprus, Nicosia 1678, Cyprus
2. Department of Physics, Research Center of Ultrafast Science, University of Cyprus, Nicosia 1678, Cyprus
3. Department of Chemistry and Biochemistry, University of Bern, Freiestrasse 3, Bern 3012, Switzerland
4. Department of Materials Chemistry, Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, Groningen 9747 AG, Netherlands
5. Department of Chemistry and Applied Biosciences, Institute of Inorganic Chemistry, ETH Zürich, Zürich CH-8093, Switzerland
6. Molecular Electronics and Photonics Research Unit, Department of Mechanical Engineering and Materials Science and Engineering, Cyprus University of Technology, Limassol 3603, Cyprus
7. Humboldt-Universität zu Berlin, Institut für Chemie, Institut für Physik, IRIS Adlershof, Brook-Taylor-Street 6, Berlin 0.12489, Germany
8. Laboratory for Thin Films and Photovoltaics, Empa−Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, Dübendorf CH-8600, Switzerland