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