1. C.H.O.S.E.
(Centre for Hybrid and Organic Solar Energy), Department of Electronic Engineering, University of Rome Tor Vergata, via del Politecnico 1, 00133 Rome, Italy
2. Istituto Italiano di Tecnologia, Graphene Labs, Via Morego 30, 16163 Genova, Italy
3. Center of Materials Technology and Photonics & Electrical Engineering Department School of Applied Technology, Technological Educational Institute (T.E.I) of Crete Heraklion, 71 004 Crete, Greece