1. Corporate Research and Advance Engineering, Robert Bosch GmbH, Robert-Bosch-Straße 2, D-71701 Schwieberdingen, Germany
2. Laboratory for Photovoltaics, University of Luxembourg, 41 rue du Brill, L-4422 Belvaux, Luxembourg
3. Corporate Research and Advance Engineering, Robert Bosch GmbH, Postfach 10 60 50, D-70049 Stuttgart, Germany
4. Bosch Solar CISTech GmbH, D-14772 Brandenburg, Germany