1. Photovoltaics Institute for Solar Energy Research Hamelin (ISFH) Am Ohrberg 1 Emmerthal 31860 Germany
2. Institute of Electronic Materials and Devices Leibniz Universität Hannover Schneiderberg 32 Hannover 30167 Germany
3. Laboratory of Nano and Quantum Engineering Leibniz Universität Hannover Schneiderberg 39 Hannover 30167 Germany
4. Department of Solar Energy, Institute for Solid‐State Physics Leibniz Universität Hannover Appelstraße 2 Hannover 30167 Germany