1. Cavendish Laboratory, Madingley Road, Cambridge CB3 0HE, United Kingdom
2. Max Planck Institute for Polymer Research Ackermannweg 10, 55128 Mainz, Germany
3. Danish National Research Foundation Centre for Molecular Movies, Niels Bohr Institute, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen O̷, Denmark
4. ECN Solar Energy, P.O. Box 1, 1755 ZG Petten, The Netherlands
5. National Laboratory of Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China
6. Polymer Department, Riso̷ National Laboratory, P.O. Box 49, Frederiksborgvej 399, 4000 Roskilde, Denmark