1 Centre for Hybrid and Organic Solar Energy, Department of Electronic Engineering, University of Rome Tor Vergata, Rome, Italy.
2 Laboratory of Advanced Solar Energy, National University of Science and Technology 'MISiS', Moscow, Russia.
3 Department of Functional Nanosystems and High-Temperature Materials, National University of Science and Technology 'MISiS', Moscow, Russia.
4 Istituto per lo Studio Materiali Nanostrutturati-CNR, Rome, Italy.
5 INFN-LNF, Frascati, Italy.
6 CNR-Institute for Complex Systems, Rome, Italy.
7 Centre for Hybrid and Organic Solar Energy, Department of Electronic Engineering, University of Rome Tor Vergata, Rome, Italy. aldo.dicarlo@uniroma2.it.
8 Laboratory of Advanced Solar Energy, National University of Science and Technology 'MISiS', Moscow, Russia. aldo.dicarlo@uniroma2.it.