1. Young Investigator Group Perovskite Tandem Solar CellsHelmholtz‐Zentrum Berlin Kekuléstraße 5 Berlin 12489 Germany
2. Faculty of Electrical EngineeringUniversity of Ljubljana Tržaška 25 Ljubljana 1000 Slovenia
3. Department of Organic ChemistryKaunas University of Technology Radvilenu pl. 19 Kaunas LT‐50254 Lithuania
4. Faculty IV‐Electrical Engineering and Computer ScienceTechnical University Berlin Marchstraße 23 Berlin 10587 Germany