1. Laboratory of Nanostructures and Nanomaterials, Institute of Physics, ASCR, 162 00 Prague, Czech Republic
2. Centre for Advanced Photovoltaics, Faculty of Electrical Engineering, Czech Technical University in Prague, 166 27 Prague, Czech Republic
3. KAUST Solar Center (KSC), King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia