1. Photovoltaic Materials and Devices Group Delft University of Technology Delft 2628 CD The Netherlands
2. Instituto Dom Luis University of Lisbon Lisbon 1749‐016 Portugal
3. University Science Park Bratislava Centre Slovak University of Technology in Bratislava Bratislava 812 43 Slovak Republic
4. New Technologies Research Centre University of West Bohemia Plzeň 306 14 The Czech Republic
5. Faculty of Mathematics, Physics and Informatics Comenius University in Bratislava Bratislava 842 48 Slovak Republic