1. ZAE Bayern, Renewable Energies Division, Unterkotzauer Weg 25, 95028 Hof, Germany
2. Materials for Electronics and Energy Technology (i-MEET), Friedrich-Alexander-Universität Erlangen-Nürnberg, Martenstraße 7, 91058 Erlangen, Germany
3. ZAE Bayern, Renewable Energies Division, Immerwahrstr. 2, 91058 Erlangen, Germany