1. Department of Physics, University of Oxford, Clarendon Laboratory, Parks Road, Oxford OX1 3PU, United Kingdom
2. Materials for Electronics and Energy Technology (i-MEET), Friedrich-Alexander-Universität Erlangen-Nürnberg, Martensstraße 7, 91058 Erlangen, Germany
3. Energy Campus Nürnberg (EnCN), Fürther Str. 250, 90429 Nürnberg, Germany
4. Department of Chemistry, Chemistry Research Laboratory, University of Oxford, OX1 3TA Oxford, United Kingdom
5. FZ Jülich, HI-ErN (IEK-11), Erlangen, Immerwahrstrasse 2, D-91058 Erlangen, Germany