1. Holst Centre/TNO, High Tech Campus 31, 5656AE Eindhoven, The Netherlands
2. CSEM PV-Center, CH-2002 Neuchâtel, Switzerland
3. Delft University of Technology, Kluyverweg 1, 2629 HS Delft, The Netherlands
4. Max-Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany