1. Zernike Institute for Advanced Materials University of Groningen Nijenborgh 4 Groningen NL‐9747 AG the Netherlands
2. Stratingh Institute for Chemistry University of Groningen Nijenborgh 4 Groningen NL‐9747 AG The Netherlands
3. King Abdullah University of Science and Technology (KAUST) Physical Science and Engineering Division (PSE) KAUST Solar Center (KSC) Thuwal 23955‐6900 Saudi Arabia
4. Laboratory of Organic Electronics Department of Science and Technology Linköping University Norrköping SE‐601 74 Sweden
5. Department of Inorganic and Physical Chemistry Ghent University Krijgslaan 281‐(S3) Ghent B‐9000 Belgium