1. Institute for Photovoltaics (ipv), University of Stuttgart, 70569 Stuttgart, Germany
2. IEK-5 Photovoltaics, Forschungszentrum Jülich, 52425 Jülich, Germany
3. Materials Research Centre, Faculty of Chemistry, Brno University of Technology, Purkynova 118, 612 00 Brno, Czech Republic
4. Department of Applied Mathematics, Faculty of Information Technology, Czech Technical University in Prague, Thakurova 9, 160 00 Brno, Czech Republic
5. Instituto de Ciencia de los Materiales (ICMUV), Universidad de Valencia, C/Catedrático José Beltrán, 2, 46980 Paterna, Valencia, Spain