1. Institute of Materials for Electronics and Energy Technology (I‐MEET) Friedrich‐Alexander‐University Erlangen‐Nuremberg Martensstraße 7 91058 Erlangen Germany
2. Physical Sciences and Engineering Division KAUST Solar Center (KSC) King Abdullah University of Science and Technology (KAUST) KSC Thuwal 23955‐6900 Saudi Arabia
3. Department of Chemistry and Centre for Plastic Electronics Imperial College London London SW7 2AZ UK
4. Bavarian Center for Applied Energy Research (ZAE Bayern) Haberstrasse 2a 91058 Erlangen Germany