1. College of Chemistry, Sichuan University, Chengdu 610064, P. R. China
2. Department of Physics, Chemistry and Biology (IFM), Linköping University, SE-581 83 Linköping, Sweden
3. POLYMAT and Polymer Science and Technology Department, Faculty of Chemistry, University of the Basque Country UPV/EHU, Paseo Manuel de Lardizabal 3, 20018 Donostia-San Sebastián, Spain
4. Flinders Institute for Nanoscale Science and Technology, Flinders University, Sturt Road, Bedford Park, Adelaide, SA 5042, Australia
5. Laboratoire de Chimie des Polymères Organiques (LCPO), University of Bordeaux, UMR 5629, B8 Allée Geoffroy Saint Hilaire, 33615 Pessac Cedex, France
6. Dresden Integrated Center for Applied Physics and Photonic Materials (IAPP) and Institute for Applied Physics, Technische Universität Dresden, Nöthnitzer Straße 61, 01187 Dresden, Germany
7. Cornell High Energy Synchrotron Source (CHESS), Ithaca, New York 14850, United States
8. Institute for Materials Research (IMO-IMOMEC), Hasselt University, Wetenschapspark 1, 3590 Diepenbeek, Belgium
9. Ikerbasque, Basque Foundation for Science, E-48011 Bilbao, Spain