1. IEK5‐PhotovoltaikForschungszentrum Jülich Jülich 52425 Germany
2. Faculty of Engineering and CENIDEUniversity of Duisburg‐Essen Carl‐Benz‐Str. 199 Duisburg 47057 Germany
3. Department of Structure and Dynamics of Energy MaterialsHelmholtz‐Zentrum‐Berlin Hahn‐Meitner‐Platz 1 Berlin 14109 Germany
4. Institute of Physics and AstronomyUniversity of Potsdam Karl‐Liebknecht‐Str. 24–25 Potsdam‐Golm D‐14476 Germany