1. CSEM SA, Sustainable Energy, Jaquet-Droz 1, 2002 Neuchâtel, Switzerland
2. Institute of Electrical and Microengineering (IEM), Photovoltaics and Thin-Film Electronics Laboratory (PV-Lab), Ecole Polytechnique Fédérale de Lausanne (EPFL), Rue de la Maladière 71b, 2002 Neuchâtel, Switzerland