1. Department of Physics, Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133 Milano, Italy
2. Department of ChiBioFarAm, University of Messina, 98166 Messina, Italy
3. CHOSE (Center for Hibrid and Organic Solar Energy), Department of Electronics Engineering, University of Rome Tor Vergata, 00133 Roma, Italy
4. Department of Mathematical and Computer Sciences, Physical Sciences and Earth Sciences, University of Messina, 98166 Messina, Italy
5. CNR, Institute for Chemical-Physical Processes (IPCF), 98158 Messina, Italy