1. Device Technology and Chemical Physics Laboratory, Department of Mechanical Engineering and Materials Science and Engineering, Cyprus University of Technology, 45 Kitiou Kyprianou str., Limassol 3041, Cyprus
2. Departamento de Física, Universidad Carlos III de Madrid, Avenida Universidad 30, 28911 Leganés, Madrid, Spain
3. Dipartimento di Chimica “Giacomo Ciamician”, Università di Bologna, via F. Selmi, 2, 40126 Bologna, Italy
4. Centre for Electronics Frontiers, Electronics and Computer Science, University of Southampton, Highfield Campus, University Road, Building 53 (Mountbatten), Southampton SO17 1BJ, UK