1. Department of Chemistry, Ångström Laboratories, Box 523, SE-75120 Uppsala, Sweden
2. Department of Physics—AlbaNova Universitetscentrum, Stockholm University, SE-10691 Stockholm, Sweden
3. Computational Laboratory for Hybrid/Organic Photovoltaics (CLHYO), Istituto CNR di Scienze e Tecnologie Chimiche “Giulio Natta” (CNR-SCITEC), via Elce di Sotto 8, 06123 Perugia, Italy
4. Department of Chemistry, Biology and Biotechnolgy, University of Perugia, via Elce di Sotto 8, 06123 Perugia, Italy
5. CompuNet, Istituto Italiano di Tecnologia, Via Morego 30, 16163 Genova, Italy
6. Laboratoire de Physique et Chimie Théoriques (LPCT), Université de Lorraine & CNRS, F-54000 Nancy, France