1. Laboratory for Photovoltaics, Physics and Materials Science Research Unit University of Luxembourg Belvaux Luxembourg
2. Laboratory for Thin Films and Photovoltaics Empa – Swiss Federal Laboratories for Materials Science and Technology Dübendorf Switzerland
3. Faculty of Science and Technology Free University of Bozen‐Bolzano Bolzano Italy
4. ZSW – Zentrum für Sonnenenergie‐ und Wasserstoff‐Forschung Baden‐Württemberg Stuttgart Germany