1. KAUST Solar Center (KSC), Physical Sciences and Engineering Division (PSE) Material Science and Engineering Program (MSE) King Abdullah University of Science and Technology (KAUST) Thuwal 23955-6900 Saudi Arabia
2. Laboratory of Nanostructures and Nanomaterials Institute of Physics Academy of Sciences of the Czech Republic v. v. i., Cukrovarnická 10 Prague 162 00 Czech Republic