1. Department of Chemistry and INSTM, University of Pavia, Via Taramelli 16, Pavia, 27100, Italy
2. Department of Physics, University of Pavia, Via Bassi 6, Pavia, 27100, Italy
3. Department of Chemistry, Biology and Biotechnology, University of Perugia and INSTM, Via Elce di Sotto 8, Perugia 06123, Italy
4. Computational Laboratory for Hybrid/Organic Photovoltaics (CLHYO), Istituto CNR di Scienze e Tecnologie Chimiche “Giulio Natta” (CNR-SCITEC), Via Elce di Sotto 8, Perugia 06123, Italy
5. Department of Mechanical Engineering, College of Engineering, Prince Mohammad Bin Fahd University, P.O. Box 1664, Al Khobar, 31952, Saudi Arabia
6. SKKU Institute of Energy Science and Technology (SIEST) Sungkyunkwan University, Suwon, 440-746, Korea