1. Dipartimento di Ingegneria della Informazione, Università di Pisa, Via G. Caruso, I-56122 Pisa, Italy
2. Electronic Materials Research Department, Advanced Technology and New Materials Research Institute, City of Scientific Research and Technological Applications (SRTA-City), New Borg El-Arab City, 21934, Alexandria, Egypt
3. Department of Materials Science, University of Milano Bicocca, via R. Cozzi 55, 20125 Milan, Italy