1. Ecole Polytechnique Fédérale de Lausanne (EPFL), Institute of Microengineering (IMT), Photovoltaics and Thin-Film Electronics Laboratory, Rue de la Maladière 71b, 2002 Neuchâtel, Switzerland
2. CSEM, PV-Center, Jaquet-Droz 1, 2002 Neuchâtel, Switzerland
3. Institute for Solar Energy Research Hamelin (ISFH), D-31860 Emmerthal, Germany