1. Institute for Solar Energy Research Hamelin (ISFH) Emmerthal Germany
2. Institute of Electronic Materials and DevicesLeibniz Universität Hannover Hannover Germany
3. Laboratory of Nano and Quantum EngineeringLeibniz Universität Hannover Hannover Germany
4. Department of Solar Energy, Institute for Solid‐State PhysicsLeibniz Universität Hannover Hannover Germany