1. Institute
of Physics, Czech Academy of Sciences, v. v. i., Cukrovarnická
10, 162 00 Prague, Czech Republic
2. Faculty
of Electrical Engineering, Czech Technical University in Prague, Technická 2, 166 27 Prague, Czech Republic
3. KAUST
Solar Center (KSC), King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
4. Photovoltaics
and Thin-Film Electronics Laboratory, Institute of Microengineering
(IMT), École Polytechnique Fédérale de Lausanne (EPFL), Rue
de la Maladière 71b, Neuchâtel 2000, Switzerland