1. Institute of Materials for Electronics and Energy Technology (i-MEET), Department of Materials Science and Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg, Martensstrasse 7, Erlangen 91058, Germany
2. Physical Chemistry II and Interdisciplinary Center for Molecular Materials, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstrasse 3, 91058 Erlangen, Germany
3. Helmholtz-Institute Erlangen-Nürnberg for Renewable Energy (HI ERN), Immerwahrstrasse 2, Erlangen 91058, Germany