1. Faculty of Electrical Engineering, Centre for Advanced Photovoltaics, Czech Technical University in Prague, Technická 2, 166 27 Prague, Czech Republic
2. Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, v.v.i., Flemingovo náměstí 2, 166 10 Praha 6, Czech Republic
3. King Abdullah University of Science and Technology (KAUST), KAUST Solar Center (KSC) 23955-6900, Thuwal, Saudi Arabia
4. Institute of Microengineering (IMT), Photovoltacis and Thin Film Electronics Laboratory, École Polytechnique Fédérale de Lausanne (EPFL), Rue de la Maladière 71b, CH-2002 Neuchâtel, Switzerland