1. Photovoltaics and Thin Film Electronics Laboratory, Institute of Electrical and Microengineering (IEM), Ecole Polytechnique Fédérale de Lausanne (EPFL), Maladière 71b, 2002 Neuchâtel, Switzerland
2. Department of Radiation Science and Technology, Faculty of Applied Sciences, Delft University of Technology, Mekelweg 15, 2629JB Delft, The Netherlands
3. Sustainable Energy Center, CSEM, Rue Jaquet-Droz 1, Neuchâtel, 2002, Switzerland