1. Department of Energy Conversion and Storage; Technical University of Denmark; Frederiksborgvej 399 DK-4000 Roskilde Denmark
2. Centre de Investigaciò en Nanociencia i Nanotecnologia (CIN2-CSIC); Laboratory of Nanostructured Materials for Photovoltaic Energy; Campus UAB, Edifici ETSE 2nd Floor. Bellaterra (Barcelona) E-08193 Spain
3. ECN; High Tech Campus 5, 5656 AE Eindhoven The Netherlands
4. Solliance, High Tech Campus; 5656 AE Eindhoven The Netherlands
5. Fraunhofer Institute for Solar Energy Systems ISE; Heidenhofstr. 2, 79110 Freiburg Germany
6. Holst Center; PO BOX 8550, 5605 KN Eindhoven The Netherlands