1. CHOSE (Centre for Hybrid and Organic Solar Energy), Department of Electronic Engineering, University of Rome-Tor Vergata, via del Politecnico 1, 00133, Rome, Italy
2. Department of Materials Science, State University of Milano-Bicocca, Via Cozzi 55, I-20126 Milano, Italy
3. Department of Centre for Energy Studies, Indian Institute of Technology Delhi, Hauz Khas, New Delhi-110016, India
4. Department of Mechanical Engineering and Materials Science, Duke University, Durham, NC, 27708, USA