1. Photovoltaics and Thin-Film Electronics Laboratory, Institute of Microengineering (IMT), Ecole Polytechnique Fédérale de Lausanne (EPFL), Rue de la Maladière 71b, 2002 Neuchâtel, Switzerland
2. CSEM, PV-Center, Jaquet-Droz 1, 2002 Neuchâtel, Switzerland
3. Laboratory Materials for Energy Conversion, Empa, Swiss Federal Laboratories for Materials Science and Technology, 8600 Dübendorf, Switzerland